Area of expertise: Elctronic materials/Nanotechnology/Li-ion battery/Solar cells/ Sensors Supervisors: Prof. C. Jacob, Prof. Swati Ray, Prof. P. K. Mitra, and Prof. Hyunjung Shin Address: Department of Electronics & Communication Engineering
School of Engineering
Shiv Nadar University
Chithera
Gautam Budh Nagar
Uttar Pradesh
India
203207
Journal of Materials Science: Materials in Electronics, 2008
... SK Panda 4 N. Singh 4 S. Pal 4 C. Jacob (&) Materials Science Centre, Indian ... more ... SK Panda 4 N. Singh 4 S. Pal 4 C. Jacob (&) Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India e-mail ... NBE) UV emission peak located at *380 nm, a strong violet emission at *441 nm with a shoulder at *421 nm, much weaker deep level related to ...
ABSTRACT We report a simple and inexpensive way for the preparation of highly transparent ZnO thi... more ABSTRACT We report a simple and inexpensive way for the preparation of highly transparent ZnO thin films and their application as active layer in UV ray sensor devices. ZnO thin films were deposited on glass substrates by thermal evaporation of pure ZnO powder. The as-deposited films were then annealed at different temperatures (100, 200, 300 and 400 °C) for various time durations (5, 15, 25 and 35 min) to make optically transparent in the visible region. The films annealed at 300 °C for 15 min show very good visible transparency and other material properties. These films were used as the active material for Ag/ZnO/Ag UV sensor devices. The sensor devices are photo conductive type and only sensitive in the UV region of the electromagnetic spectrum. Maximum photo-current gain of the UV sensor device is ∼2. Possible sensing mechanism has been discussed.
Reddish-yellow color colloid consisting of silver nanoparticles (Ag NPs) has been synthesized by ... more Reddish-yellow color colloid consisting of silver nanoparticles (Ag NPs) has been synthesized by reducing aqueous AgNO3 solution by photo-induced citrate reduction technique under UV light. As prepared colloid exhibits single and intense plasmonic absorption peak in the violet region of the visible spectra with the peak centered at ~ 405 nm. The NPs are fine and spherical with diameter ranging from 5 to 10 nm. These colloidal NPs have been used for the quantitative detection of uric acid by UV-VIS spectroscopy. A linear red shifting of the characteristics Plasmonic absorption peak of Ag NPs is observed with uric acid concentration. Uric acid can be detected by UV-VIS spectroscopy down to 5 nM limit using the prepared colloid.Reddish-yellow color colloid consisting of silver nanoparticles (Ag NPs) has been synthesized by reducing aqueous AgNO3 solution by photo-induced citrate reduction technique under UV light. As prepared colloid exhibits single and intense plasmonic absorption peak in the violet region of the visible spectra with the peak centered at ~ 405 nm. The NPs are fine and spherical with diameter ranging from 5 to 10 nm. These colloidal NPs have been used for the quantitative detection of uric acid by UV-VIS spectroscopy. A linear red shifting of the characteristics Plasmonic absorption peak of Ag NPs is observed with uric acid concentration. Uric acid can be detected by UV-VIS spectroscopy down to 5 nM limit using the prepared colloid.
Abstract β-SiC nanowires have been synthesized on etch-patterned wafers in a chemical vapor depos... more Abstract β-SiC nanowires have been synthesized on etch-patterned wafers in a chemical vapor deposition (CVD) system without using any metal catalyst. The nanowires were grown selectively inside the 'V-groove'of etch-patterned silicon (110) substrate which was used ...
Page 1. A comparative study of the synthesis of carbon nanotubes using Ni and Fe as catalyst Joyd... more Page 1. A comparative study of the synthesis of carbon nanotubes using Ni and Fe as catalyst Joydip Sengupta 1, a , Sovan Kumar Panda 2, b and Chacko Jacob 3, c 1 Materials Science Centre, Indian Institute of Technology, Kharagpur, India 721302 ...
Cubic silicon carbide (beta-SiC)/SiO2 nanowires with uniform and knotted-core structures have bee... more Cubic silicon carbide (beta-SiC)/SiO2 nanowires with uniform and knotted-core structures have been synthesized on nickel-coated Si(111) substrates at 1150 degrees C by using hexamethyldisilane (HMDS) as the source material in a hot wall atmospheric pressure chemical vapor deposition (APCVD) system. The nanowires consist of a single crystalline beta-SiC core wrapped with an amorphous SiO2 shell. The as-prepared SiC nanowires and the deposited Ni films were characterized by field emission scanning electron microscopy, X-ray diffraction, high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, micro-Raman spectroscopy, infrared spectroscopy and atomic force microscopy. The results show that the nanowires are random in direction and have diameter ranges from 25 nm to 70 nm. The core of the nanowires has a cubic zinc blend structure and a high density of planar defects is often found. The twin plane defects are suspected to be the main reason for the formation of the knotted-core SiC nanowires. A possible growth mechanism based on vapor-liquid-solid (VLS) by base growth technique is proposed.
This chapter aims to describe multifarious schemes of detecting bio-molecules by using surface en... more This chapter aims to describe multifarious schemes of detecting bio-molecules by using surface enhanced Raman spectroscopy (SERS)-substrates. At first, current state of knowledge concerning the mechanism of SERS, SERS-active materials and various parameters that influence SERS have been discussed. Classification of SERS substrates, depending on their physical structures, has been reported in the following section. Finally, fabrication methods and recent applications of SERS including sensing, single molecule SERS, and real-world applications for bio-molecular probing have been highlighted.
Journal of Materials Science: Materials in Electronics, 2008
... SK Panda 4 N. Singh 4 S. Pal 4 C. Jacob (&) Materials Science Centre, Indian ... more ... SK Panda 4 N. Singh 4 S. Pal 4 C. Jacob (&) Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India e-mail ... NBE) UV emission peak located at *380 nm, a strong violet emission at *441 nm with a shoulder at *421 nm, much weaker deep level related to ...
ABSTRACT We report a simple and inexpensive way for the preparation of highly transparent ZnO thi... more ABSTRACT We report a simple and inexpensive way for the preparation of highly transparent ZnO thin films and their application as active layer in UV ray sensor devices. ZnO thin films were deposited on glass substrates by thermal evaporation of pure ZnO powder. The as-deposited films were then annealed at different temperatures (100, 200, 300 and 400 °C) for various time durations (5, 15, 25 and 35 min) to make optically transparent in the visible region. The films annealed at 300 °C for 15 min show very good visible transparency and other material properties. These films were used as the active material for Ag/ZnO/Ag UV sensor devices. The sensor devices are photo conductive type and only sensitive in the UV region of the electromagnetic spectrum. Maximum photo-current gain of the UV sensor device is ∼2. Possible sensing mechanism has been discussed.
Reddish-yellow color colloid consisting of silver nanoparticles (Ag NPs) has been synthesized by ... more Reddish-yellow color colloid consisting of silver nanoparticles (Ag NPs) has been synthesized by reducing aqueous AgNO3 solution by photo-induced citrate reduction technique under UV light. As prepared colloid exhibits single and intense plasmonic absorption peak in the violet region of the visible spectra with the peak centered at ~ 405 nm. The NPs are fine and spherical with diameter ranging from 5 to 10 nm. These colloidal NPs have been used for the quantitative detection of uric acid by UV-VIS spectroscopy. A linear red shifting of the characteristics Plasmonic absorption peak of Ag NPs is observed with uric acid concentration. Uric acid can be detected by UV-VIS spectroscopy down to 5 nM limit using the prepared colloid.Reddish-yellow color colloid consisting of silver nanoparticles (Ag NPs) has been synthesized by reducing aqueous AgNO3 solution by photo-induced citrate reduction technique under UV light. As prepared colloid exhibits single and intense plasmonic absorption peak in the violet region of the visible spectra with the peak centered at ~ 405 nm. The NPs are fine and spherical with diameter ranging from 5 to 10 nm. These colloidal NPs have been used for the quantitative detection of uric acid by UV-VIS spectroscopy. A linear red shifting of the characteristics Plasmonic absorption peak of Ag NPs is observed with uric acid concentration. Uric acid can be detected by UV-VIS spectroscopy down to 5 nM limit using the prepared colloid.
Abstract β-SiC nanowires have been synthesized on etch-patterned wafers in a chemical vapor depos... more Abstract β-SiC nanowires have been synthesized on etch-patterned wafers in a chemical vapor deposition (CVD) system without using any metal catalyst. The nanowires were grown selectively inside the 'V-groove'of etch-patterned silicon (110) substrate which was used ...
Page 1. A comparative study of the synthesis of carbon nanotubes using Ni and Fe as catalyst Joyd... more Page 1. A comparative study of the synthesis of carbon nanotubes using Ni and Fe as catalyst Joydip Sengupta 1, a , Sovan Kumar Panda 2, b and Chacko Jacob 3, c 1 Materials Science Centre, Indian Institute of Technology, Kharagpur, India 721302 ...
Cubic silicon carbide (beta-SiC)/SiO2 nanowires with uniform and knotted-core structures have bee... more Cubic silicon carbide (beta-SiC)/SiO2 nanowires with uniform and knotted-core structures have been synthesized on nickel-coated Si(111) substrates at 1150 degrees C by using hexamethyldisilane (HMDS) as the source material in a hot wall atmospheric pressure chemical vapor deposition (APCVD) system. The nanowires consist of a single crystalline beta-SiC core wrapped with an amorphous SiO2 shell. The as-prepared SiC nanowires and the deposited Ni films were characterized by field emission scanning electron microscopy, X-ray diffraction, high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, micro-Raman spectroscopy, infrared spectroscopy and atomic force microscopy. The results show that the nanowires are random in direction and have diameter ranges from 25 nm to 70 nm. The core of the nanowires has a cubic zinc blend structure and a high density of planar defects is often found. The twin plane defects are suspected to be the main reason for the formation of the knotted-core SiC nanowires. A possible growth mechanism based on vapor-liquid-solid (VLS) by base growth technique is proposed.
This chapter aims to describe multifarious schemes of detecting bio-molecules by using surface en... more This chapter aims to describe multifarious schemes of detecting bio-molecules by using surface enhanced Raman spectroscopy (SERS)-substrates. At first, current state of knowledge concerning the mechanism of SERS, SERS-active materials and various parameters that influence SERS have been discussed. Classification of SERS substrates, depending on their physical structures, has been reported in the following section. Finally, fabrication methods and recent applications of SERS including sensing, single molecule SERS, and real-world applications for bio-molecular probing have been highlighted.
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Papers by Dr. Sovan Kumar Panda