Currently, 2D layered material (2DLM) based heterostructures, also known as van der Waals (vdW) h... more Currently, 2D layered material (2DLM) based heterostructures, also known as van der Waals (vdW) heterostructures, are actively pursued owing to their great potential for optoelectronic applications. They are produced either by vertical stacking of individual layers or via in-plane stitching of 2DLMs. Producing vdW heterostructures with clean interfaces and growing them using direct growth methods are challenging. Herein, we report successful growth of large-area MoS2–WS2 vdW heterostructures (single- to few-monolayer, ML, the thickness of MoS2 and WS2) on oxidized Si (100) substrates using the catalyst-free Pulsed Laser Deposition technique. The in-plane (E12g) and out-of-plane (A1g) Raman-active phonon modes are used to probe the interlayer interactions between the constituent 2D layers. We observe a blueshift of 4.73 (1.63) cm−1 of the A1g peak corresponding to MoS2 (WS2) in the MoS2(1ML)–WS2(1ML) heterostructure compared to 1.27 (0.88) cm−1 for the homo-bilayers. The E12g mode also exhibited blueshift for the heterostructure and redshift for the bilayer of the constituent material. We show that the broadband photodetectors fabricated utilizing in situ grown MoS2–WS2 heterostructures exhibit responsivity, specific detectivity, and current on/off ratio as high as 2.51 × 105 A/W, 4.20 × 1014 Jones, and 1.05 × 105, respectively, under 24 μW/cm2 at 405 nm excitation. The successful fabrication of vdW heterostructures using a simple and scalable direct growth method and excellent photodetector performance pave the way for exploitation of their application potential and offer a playground to test some of the theoretical predictions.
Journal of Materials Science: Materials in Electronics, 2022
In the present work, Li-rich layered Li(Li0.25Co0.37Mn0.38)O2 (LiCMO) material is prepared using ... more In the present work, Li-rich layered Li(Li0.25Co0.37Mn0.38)O2 (LiCMO) material is prepared using sol–gel technique. The effect of calcination temperature on the structural and morphological characteristics of LiCMO is studied. The electrochemical performance of layered LiCMO/graphite (Cell 1) and LiCMO/Li (Cell 2) has been investigated. The charge transfer resistance (Rct), lithium diffusion coefficients, and discharging capacity are found to be 16,242 Ω, 3.89 × 10–11 S−1 cm2, and 5.26 mAhg−1 and 16 Ω, 20.78 × 10–8 S−1 cm2, and 323 mAhg−1 for Cells 1 and 2, respectively. The presence of efficient lithium-ion transfer tendency and minimal kinetic barrier for lithium diffusion results in enhanced electrochemical properties of Cell 2. Appreciable results for (LiCMO/Li) coin cell make it a unique combination of LiCMO as cathode with Li as anode for the high energy density lithium-ion battery.
Abstract The ferromagnetic and ferroelectric laminated structure has been utilized to study the m... more Abstract The ferromagnetic and ferroelectric laminated structure has been utilized to study the magnetoelectric (ME) effect, which holds great potential to fabricate micro-electro-mechanical devices with a high figure of merit. Designed a laminated heterostructure using ribbons of Metglas (Fe–Co–Si–B alloy) having high magnetic permeability and lead-free piezoelectric composites of 0.92(Na0.5Bi0.5)TiO3-0.08BaTiO3 (NBT-BT) to generate the significant magnitude of direct ME voltage. The displacement-voltage measurements of NBT-BT yield a high response showing the nature of the piezoelectricity effect. The strength of ME coupling is determined from the ME voltage coefficient (αME), ME measurements have been carried out in the range of 0–6 kHz frequencies. The magnitude of the direct ME effect was found about 45–50 mV/Oe.cm over a low magnetic field of less than ±8 kOe. The real-time ME effect produced nearly 274.5 and 280.2 mV of ME voltages for the applied field of 200 and 300 Oe, respectively. It shows that the trilayer composite structure may be used as weak magnetic field sensors and energy harvesters.
SAW propagation characteristics, velocity and temperature coefficient of delay (TCD) of a 128° Y-... more SAW propagation characteristics, velocity and temperature coefficient of delay (TCD) of a 128° Y-X LiNbO3 SAW device integrated with an over-layer of rf magnetron sputtered SiO2 film have been studied. A deviation in the experimental observations with respect to the theoretical calculations on the layered structure SiO2/LiNbO3 are identified mainly due to the difference in the material parameters of the
Nanoclusters of SnO2 were synthesized using sol gel technique. The solution containing SnO2 nanoc... more Nanoclusters of SnO2 were synthesized using sol gel technique. The solution containing SnO2 nanoclusters was spin coated on Pt inert digital electrodes/glass substrate to deposit thin film of semiconducting nanoclusters of SnO2 (200nm). TEM images and electron diffraction pattern were studied to find out the size and polycrystalline nature of Tin oxide nanoclusters. The SnO2 thin film was used for NO2 gas sensing and was found to be highly sensitive to detect ultra-low concentrations (ppb range) of NO2 at room temperature.
Ultra-violet (UV) photodetector is fabricated by RF magnetron sputtered ZnO thin films of differe... more Ultra-violet (UV) photodetector is fabricated by RF magnetron sputtered ZnO thin films of different thickness (50 to 400 nm). ZnO film with thickness 100 nm is found to exhibit enhanced UV photo response in comparison to that observed in the thicker films and is thermally treated by two different techniques, one by furnace method and another by pulsed laser irradiation.
ABSTRACT Packaged LPG sensor has been prepared by integrating an in-built Platinum (Pt) micro-hea... more ABSTRACT Packaged LPG sensor has been prepared by integrating an in-built Platinum (Pt) micro-heater with the SnO2 thin film deposited using RF sputtering technique. The nano-clusters of Pt catalyst were dispersed uniformly over the surface of SnO2 thin film. A maximum sensing response of about ∼309 was obtained towards 500 ppm of LPG at an operating temperature of 200 °C with comparatively low power consumption of about 1.2 mW. The issue of reproducibility and reliability of LPG sensors were tested by considering twenty completely packaged sensors prepared in four different batches under similar processing conditions towards detection of LPG. The ageing effect on sensing response of the packaged LPG sensors was also carried out. The estimated mean value of the sensing response for all the packaged sensors was found to be about 303 with a relatively low value of standard deviation of about 3.5, confirming the high reproducibility of the packaged LPG sensors prepared in present work. The repeatability of the sensing response for different LPG sensors shows insignificant drift in the base line. The obtained results are encouraging for mass production of LPG sensors having integrated micro-heaters with good reliability, reproducibility and long shelf life.
ABSTRACTTemperature dependent optical properties of RF-sputtered c-axis oriented ZnO:N thin film ... more ABSTRACTTemperature dependent optical properties of RF-sputtered c-axis oriented ZnO:N thin film have been investigated. Surface Plasmon modes are excited at the metal-dielectric interface in the Kretschmann-Reather configuration using prism coupling technique. Effect of ZnO:N thin film deposited over Prism-Au structure on the SPR reflectance is studied over a wide range of temperature from 300–500 K at 633 nm wavelength. The value of dielectric constant of ZnO:N film obtained by fitting the experimentally obtained data with the theoretically generated SPR curve at the optical frequency is found to increase linearly with temperature. The increase in dielectric constant (4.03 to 4.11) with increase in temperature from 300 K to 500 K indicates a promising application of the system as an efficient low-cost temperature sensor.
In this paper gas sensing properties of 0.5–3% polyaniline (PAni) doped SnO 2 thin films sensors ... more In this paper gas sensing properties of 0.5–3% polyaniline (PAni) doped SnO 2 thin films sensors prepared by chemical route have been studied towards the trace level detection of NO 2 gas. The structural, optical and surface morphological properties of the PAni doped SnO 2 thin films were investigated by performing X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Raman spectroscopy measurements. A good correlation has been identified between the microstructural and gas sensing properties of these prepared sensors. Out of these films, 1% PAni doped SnO 2 sensor showed high sensitivity towards NO 2 gas along with a sensitivity of 3.01 × 102 at 40°C for 10 ppm of gas. On exposure to NO 2 gas, resistance of all sensors increased to a large extent, even greater than three orders of magnitude. These changes in resistance upon removal of NO 2 gas are found to be reversible in nature and the prepared composite film sensors showed good sensitivity with relatively faster re...
ABSTRACT Photoconductivity due to Ultra-violet (UV) rays has been studied in pure ZnO, Au overlay... more ABSTRACT Photoconductivity due to Ultra-violet (UV) rays has been studied in pure ZnO, Au overlayer/ZnO and Au nanodots/ZnO thin film photodetector structures synthesized by sol–gel technique. The prepared photodetector structures were studied for their response towards the illumination of UV radiations (λ = 365 nm and intensity = 24 μwatt/cm2). Incorporation of 20 nm thick gold (Au) on the ZnO film surface in continuous form of layer and nano-dots leads to an enhanced photoresponse (K = I on/I off) of 3.0×103 and 5.5×103 respectively as compared to 1.52×102 obtained for the pure ZnO film based structure. The existence of Au on ZnO surface which makes a schottky barrier at the Au–ZnO interface leads to the significant drop in dark current (I off) and is contributing for enhancing the photoresponse characteristics. In addition, well known plasmon propagating properties exhibited by Au nanoclusters are proved to be helpful in absorbing large amount of UV photons resulting in high photocurrent and hence enhanced response parameters. The physical and optical properties of the prepared photodetector structures are studied using XRD, UV-visible spectrophotometer and SEM respectively and have been correlated with the observed enhanced photoconducting response.
ABSTRACT The highly sensitive low temperature operated nitrogen dioxide (NO2) gas sensor has been... more ABSTRACT The highly sensitive low temperature operated nitrogen dioxide (NO2) gas sensor has been fabricated using SnO2 thin film doped with different catalysts (Pt, Ag and CuO) using chemical route. Amongst all the prepared sensor structures, Pt-doped SnO2 thin film based sensor (SnO2–Pt) was found to give maximum sensing response of about 1.83×102 towards low concentration of (20 ppm) of NO2 gas at a lower operating temperature of 90°C with very fast response (∼ 6 sec) and recovery (∼ 13 sec) time. The structural, microstructural and optical properties of the prepared sensor have been studied using X-ray diffraction (XRD), Scanning electron microscope (SEM) and UV-Visible spectroscopy and the results have also been correlated with the observed gas sensing properties.
ABSTRACT Temperature dependent optical and dielectric properties of WO3 films have been explored ... more ABSTRACT Temperature dependent optical and dielectric properties of WO3 films have been explored using surface Plasmon resonance (SPR) method which shows the promising application as a temperature sensor. The optical temperature sensor is essential for the development of chemical, physical and biomedical sensors. Prism coupling method in Kretschmann configuration is employed to study the influence of temperature on optical property of rf-magnetron sputtered WO3 thin film over the temperature range from 300–523 K using a He–Ne laser of 633 nm wavelength. The SPR resonance angle and minimum reflectance were observed to increase linearly with increase in temperature. The values of complex refractive index and dielectric constant for WO3 thin film were evaluated at room temperature using Fresnel's equations which matches well to the reported values. The change in complex dielectric constant and refractive index of WO3 thin film has also been studied with variation in temperature, which indicates that SPR is an efficient approach to investigate the optical properties of thin films with temperature and can be exploited as temperature sensor.
RF sputtered tin oxide (SnO2) thin film matrix has been efficiently exploited for the detection o... more RF sputtered tin oxide (SnO2) thin film matrix has been efficiently exploited for the detection of uric acid. The deposition parameters for SnO2 thin film have been optimized to yield better electrocatalytic properties. A correlation between its electrocatalytic properties with the structural and electrical properties has been made. SnO2 thin film prepared under optimized growth parameter (70% argon in reactive gas ambient of Ar and O2) exhibits higher mobility of charge carrier and high carrier concentration thereby resulting in enhanced charge transfer characteristics. High surface coverage of uricase onto SnO2 thin films (4.28 × 10(-4) mole cm(-2)), low value of Michaelis-Menten constant (km) 0.18 mM, good linearity in detection of uric acid in the range 0.05-1.00 mM and a fast response of 5 s are attractive features of prepared SnO2 thin film based bioelectrodes for efficient detection of uric acid. The nanoporous and rough surface morphology of SnO2 thin film besides its high carrier mobility in comparison to that of ITO is responsible for the obtained enhanced sensitivity (∼700 μA mM(-1)) and improved sensing response characteristics towards uric acid.
IEEE Transactions on Device and Materials Reliability, 2005
Abstract Surface acoustic wave (SAW) filters for low-frequency (38-65 MHz) applications have been... more Abstract Surface acoustic wave (SAW) filters for low-frequency (38-65 MHz) applications have been developed using a radio frequency (RF)-magnetron-sputtered ZnO film on fused-quartz substrates. SAW propagation characteristics such as electromechanical coupling ...
Currently, 2D layered material (2DLM) based heterostructures, also known as van der Waals (vdW) h... more Currently, 2D layered material (2DLM) based heterostructures, also known as van der Waals (vdW) heterostructures, are actively pursued owing to their great potential for optoelectronic applications. They are produced either by vertical stacking of individual layers or via in-plane stitching of 2DLMs. Producing vdW heterostructures with clean interfaces and growing them using direct growth methods are challenging. Herein, we report successful growth of large-area MoS2–WS2 vdW heterostructures (single- to few-monolayer, ML, the thickness of MoS2 and WS2) on oxidized Si (100) substrates using the catalyst-free Pulsed Laser Deposition technique. The in-plane (E12g) and out-of-plane (A1g) Raman-active phonon modes are used to probe the interlayer interactions between the constituent 2D layers. We observe a blueshift of 4.73 (1.63) cm−1 of the A1g peak corresponding to MoS2 (WS2) in the MoS2(1ML)–WS2(1ML) heterostructure compared to 1.27 (0.88) cm−1 for the homo-bilayers. The E12g mode also exhibited blueshift for the heterostructure and redshift for the bilayer of the constituent material. We show that the broadband photodetectors fabricated utilizing in situ grown MoS2–WS2 heterostructures exhibit responsivity, specific detectivity, and current on/off ratio as high as 2.51 × 105 A/W, 4.20 × 1014 Jones, and 1.05 × 105, respectively, under 24 μW/cm2 at 405 nm excitation. The successful fabrication of vdW heterostructures using a simple and scalable direct growth method and excellent photodetector performance pave the way for exploitation of their application potential and offer a playground to test some of the theoretical predictions.
Journal of Materials Science: Materials in Electronics, 2022
In the present work, Li-rich layered Li(Li0.25Co0.37Mn0.38)O2 (LiCMO) material is prepared using ... more In the present work, Li-rich layered Li(Li0.25Co0.37Mn0.38)O2 (LiCMO) material is prepared using sol–gel technique. The effect of calcination temperature on the structural and morphological characteristics of LiCMO is studied. The electrochemical performance of layered LiCMO/graphite (Cell 1) and LiCMO/Li (Cell 2) has been investigated. The charge transfer resistance (Rct), lithium diffusion coefficients, and discharging capacity are found to be 16,242 Ω, 3.89 × 10–11 S−1 cm2, and 5.26 mAhg−1 and 16 Ω, 20.78 × 10–8 S−1 cm2, and 323 mAhg−1 for Cells 1 and 2, respectively. The presence of efficient lithium-ion transfer tendency and minimal kinetic barrier for lithium diffusion results in enhanced electrochemical properties of Cell 2. Appreciable results for (LiCMO/Li) coin cell make it a unique combination of LiCMO as cathode with Li as anode for the high energy density lithium-ion battery.
Abstract The ferromagnetic and ferroelectric laminated structure has been utilized to study the m... more Abstract The ferromagnetic and ferroelectric laminated structure has been utilized to study the magnetoelectric (ME) effect, which holds great potential to fabricate micro-electro-mechanical devices with a high figure of merit. Designed a laminated heterostructure using ribbons of Metglas (Fe–Co–Si–B alloy) having high magnetic permeability and lead-free piezoelectric composites of 0.92(Na0.5Bi0.5)TiO3-0.08BaTiO3 (NBT-BT) to generate the significant magnitude of direct ME voltage. The displacement-voltage measurements of NBT-BT yield a high response showing the nature of the piezoelectricity effect. The strength of ME coupling is determined from the ME voltage coefficient (αME), ME measurements have been carried out in the range of 0–6 kHz frequencies. The magnitude of the direct ME effect was found about 45–50 mV/Oe.cm over a low magnetic field of less than ±8 kOe. The real-time ME effect produced nearly 274.5 and 280.2 mV of ME voltages for the applied field of 200 and 300 Oe, respectively. It shows that the trilayer composite structure may be used as weak magnetic field sensors and energy harvesters.
SAW propagation characteristics, velocity and temperature coefficient of delay (TCD) of a 128° Y-... more SAW propagation characteristics, velocity and temperature coefficient of delay (TCD) of a 128° Y-X LiNbO3 SAW device integrated with an over-layer of rf magnetron sputtered SiO2 film have been studied. A deviation in the experimental observations with respect to the theoretical calculations on the layered structure SiO2/LiNbO3 are identified mainly due to the difference in the material parameters of the
Nanoclusters of SnO2 were synthesized using sol gel technique. The solution containing SnO2 nanoc... more Nanoclusters of SnO2 were synthesized using sol gel technique. The solution containing SnO2 nanoclusters was spin coated on Pt inert digital electrodes/glass substrate to deposit thin film of semiconducting nanoclusters of SnO2 (200nm). TEM images and electron diffraction pattern were studied to find out the size and polycrystalline nature of Tin oxide nanoclusters. The SnO2 thin film was used for NO2 gas sensing and was found to be highly sensitive to detect ultra-low concentrations (ppb range) of NO2 at room temperature.
Ultra-violet (UV) photodetector is fabricated by RF magnetron sputtered ZnO thin films of differe... more Ultra-violet (UV) photodetector is fabricated by RF magnetron sputtered ZnO thin films of different thickness (50 to 400 nm). ZnO film with thickness 100 nm is found to exhibit enhanced UV photo response in comparison to that observed in the thicker films and is thermally treated by two different techniques, one by furnace method and another by pulsed laser irradiation.
ABSTRACT Packaged LPG sensor has been prepared by integrating an in-built Platinum (Pt) micro-hea... more ABSTRACT Packaged LPG sensor has been prepared by integrating an in-built Platinum (Pt) micro-heater with the SnO2 thin film deposited using RF sputtering technique. The nano-clusters of Pt catalyst were dispersed uniformly over the surface of SnO2 thin film. A maximum sensing response of about ∼309 was obtained towards 500 ppm of LPG at an operating temperature of 200 °C with comparatively low power consumption of about 1.2 mW. The issue of reproducibility and reliability of LPG sensors were tested by considering twenty completely packaged sensors prepared in four different batches under similar processing conditions towards detection of LPG. The ageing effect on sensing response of the packaged LPG sensors was also carried out. The estimated mean value of the sensing response for all the packaged sensors was found to be about 303 with a relatively low value of standard deviation of about 3.5, confirming the high reproducibility of the packaged LPG sensors prepared in present work. The repeatability of the sensing response for different LPG sensors shows insignificant drift in the base line. The obtained results are encouraging for mass production of LPG sensors having integrated micro-heaters with good reliability, reproducibility and long shelf life.
ABSTRACTTemperature dependent optical properties of RF-sputtered c-axis oriented ZnO:N thin film ... more ABSTRACTTemperature dependent optical properties of RF-sputtered c-axis oriented ZnO:N thin film have been investigated. Surface Plasmon modes are excited at the metal-dielectric interface in the Kretschmann-Reather configuration using prism coupling technique. Effect of ZnO:N thin film deposited over Prism-Au structure on the SPR reflectance is studied over a wide range of temperature from 300–500 K at 633 nm wavelength. The value of dielectric constant of ZnO:N film obtained by fitting the experimentally obtained data with the theoretically generated SPR curve at the optical frequency is found to increase linearly with temperature. The increase in dielectric constant (4.03 to 4.11) with increase in temperature from 300 K to 500 K indicates a promising application of the system as an efficient low-cost temperature sensor.
In this paper gas sensing properties of 0.5–3% polyaniline (PAni) doped SnO 2 thin films sensors ... more In this paper gas sensing properties of 0.5–3% polyaniline (PAni) doped SnO 2 thin films sensors prepared by chemical route have been studied towards the trace level detection of NO 2 gas. The structural, optical and surface morphological properties of the PAni doped SnO 2 thin films were investigated by performing X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Raman spectroscopy measurements. A good correlation has been identified between the microstructural and gas sensing properties of these prepared sensors. Out of these films, 1% PAni doped SnO 2 sensor showed high sensitivity towards NO 2 gas along with a sensitivity of 3.01 × 102 at 40°C for 10 ppm of gas. On exposure to NO 2 gas, resistance of all sensors increased to a large extent, even greater than three orders of magnitude. These changes in resistance upon removal of NO 2 gas are found to be reversible in nature and the prepared composite film sensors showed good sensitivity with relatively faster re...
ABSTRACT Photoconductivity due to Ultra-violet (UV) rays has been studied in pure ZnO, Au overlay... more ABSTRACT Photoconductivity due to Ultra-violet (UV) rays has been studied in pure ZnO, Au overlayer/ZnO and Au nanodots/ZnO thin film photodetector structures synthesized by sol–gel technique. The prepared photodetector structures were studied for their response towards the illumination of UV radiations (λ = 365 nm and intensity = 24 μwatt/cm2). Incorporation of 20 nm thick gold (Au) on the ZnO film surface in continuous form of layer and nano-dots leads to an enhanced photoresponse (K = I on/I off) of 3.0×103 and 5.5×103 respectively as compared to 1.52×102 obtained for the pure ZnO film based structure. The existence of Au on ZnO surface which makes a schottky barrier at the Au–ZnO interface leads to the significant drop in dark current (I off) and is contributing for enhancing the photoresponse characteristics. In addition, well known plasmon propagating properties exhibited by Au nanoclusters are proved to be helpful in absorbing large amount of UV photons resulting in high photocurrent and hence enhanced response parameters. The physical and optical properties of the prepared photodetector structures are studied using XRD, UV-visible spectrophotometer and SEM respectively and have been correlated with the observed enhanced photoconducting response.
ABSTRACT The highly sensitive low temperature operated nitrogen dioxide (NO2) gas sensor has been... more ABSTRACT The highly sensitive low temperature operated nitrogen dioxide (NO2) gas sensor has been fabricated using SnO2 thin film doped with different catalysts (Pt, Ag and CuO) using chemical route. Amongst all the prepared sensor structures, Pt-doped SnO2 thin film based sensor (SnO2–Pt) was found to give maximum sensing response of about 1.83×102 towards low concentration of (20 ppm) of NO2 gas at a lower operating temperature of 90°C with very fast response (∼ 6 sec) and recovery (∼ 13 sec) time. The structural, microstructural and optical properties of the prepared sensor have been studied using X-ray diffraction (XRD), Scanning electron microscope (SEM) and UV-Visible spectroscopy and the results have also been correlated with the observed gas sensing properties.
ABSTRACT Temperature dependent optical and dielectric properties of WO3 films have been explored ... more ABSTRACT Temperature dependent optical and dielectric properties of WO3 films have been explored using surface Plasmon resonance (SPR) method which shows the promising application as a temperature sensor. The optical temperature sensor is essential for the development of chemical, physical and biomedical sensors. Prism coupling method in Kretschmann configuration is employed to study the influence of temperature on optical property of rf-magnetron sputtered WO3 thin film over the temperature range from 300–523 K using a He–Ne laser of 633 nm wavelength. The SPR resonance angle and minimum reflectance were observed to increase linearly with increase in temperature. The values of complex refractive index and dielectric constant for WO3 thin film were evaluated at room temperature using Fresnel's equations which matches well to the reported values. The change in complex dielectric constant and refractive index of WO3 thin film has also been studied with variation in temperature, which indicates that SPR is an efficient approach to investigate the optical properties of thin films with temperature and can be exploited as temperature sensor.
RF sputtered tin oxide (SnO2) thin film matrix has been efficiently exploited for the detection o... more RF sputtered tin oxide (SnO2) thin film matrix has been efficiently exploited for the detection of uric acid. The deposition parameters for SnO2 thin film have been optimized to yield better electrocatalytic properties. A correlation between its electrocatalytic properties with the structural and electrical properties has been made. SnO2 thin film prepared under optimized growth parameter (70% argon in reactive gas ambient of Ar and O2) exhibits higher mobility of charge carrier and high carrier concentration thereby resulting in enhanced charge transfer characteristics. High surface coverage of uricase onto SnO2 thin films (4.28 × 10(-4) mole cm(-2)), low value of Michaelis-Menten constant (km) 0.18 mM, good linearity in detection of uric acid in the range 0.05-1.00 mM and a fast response of 5 s are attractive features of prepared SnO2 thin film based bioelectrodes for efficient detection of uric acid. The nanoporous and rough surface morphology of SnO2 thin film besides its high carrier mobility in comparison to that of ITO is responsible for the obtained enhanced sensitivity (∼700 μA mM(-1)) and improved sensing response characteristics towards uric acid.
IEEE Transactions on Device and Materials Reliability, 2005
Abstract Surface acoustic wave (SAW) filters for low-frequency (38-65 MHz) applications have been... more Abstract Surface acoustic wave (SAW) filters for low-frequency (38-65 MHz) applications have been developed using a radio frequency (RF)-magnetron-sputtered ZnO film on fused-quartz substrates. SAW propagation characteristics such as electromechanical coupling ...
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