Se presenta el estado de avance del desarrollo de celdas solares de silicio monocristalino en la ... more Se presenta el estado de avance del desarrollo de celdas solares de silicio monocristalino en la CNEA. Se elaboraron celdas solares a partir de obleas de silicio cristalino tipo p, obteniendo las junturas frontal y posterior por difusion de los dopantes en una sola etapa. Los contactos metalicos se realizaron por evaporacion en vacio y posterior engrosamiento electrolitico. Se analizaron y utilizaron diversos tratamientos antirreflectantes sobre la cara frontal. Los desarrollos realizados permitieron disenar, elaborar y caracterizar, por primera vez en el pais, celdas fotovoltaicas de silicio cristalino con eficiencias superiores a las de dispositivos comerciales del mismo tipo. En particular, se obtuvieron valores de tension de circuito abierto superiores a 600mV, corriente de cortocircuito de 34mA/cm2 , factor de llenado ("fill factor") de 0.80, y eficiencias entre el 14% y el 15%.
ABSTRACT Abstract : The majority of the high energy ion beam micro-machining work has been carrie... more ABSTRACT Abstract : The majority of the high energy ion beam micro-machining work has been carried out using MeV protons. This direct write-process was used to produce 3D structures in different type of materials.
This paper presents the fabrication and characterization of a sensor based on a nanostructured Cu... more This paper presents the fabrication and characterization of a sensor based on a nanostructured CuO thin film on a silicon substrate. We evaluated the sensitivity and selectivity of the sensor to ethyl or isopropyl alcohol at room temperature in the absence and presence of green light. Measurements of sensor responses on both light conditions show repetitive changes in selectivity, presumably based on sustancial changes in chemical interactions of analyte with excited nano-structured CuO thin film.
Gas sensors TiO2 based were prepared by anodic oxidation method. The morphology of the TiO2 nanos... more Gas sensors TiO2 based were prepared by anodic oxidation method. The morphology of the TiO2 nanostructures were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) and Raman spectroscopy. The gas sensing properties of TiO2 nanotubes exposed CO have been tested in a wide range of operating temperatures. The sensor using the fabricated nanotube arrays as the sensing elements demonstrated a good response to different concentrations of carbon monoxide from 480 to 850 ppm at 350 °C.
In the present work the classification of dairies additives in a rapid and simple way, is propose... more In the present work the classification of dairies additives in a rapid and simple way, is proposed. Measurements were made by means of an Electronic Nose developed in our laboratories, which we named 'Patagonia E-Nose.' This E-Nose is composed of SnO2 sensors located in a thermally stabilized chamber which improves the repeatability of the measurements. Samples of various hydrolyzed dairies were measured using air as a reference gas. Then, the integrals of the signals were analyzed using a combination of different multivariate chemometric methods such as linear discriminant analysis (LDA), principal components analysis (PCA), back-propagation neural network and different classifiers. Also, different algorithms were implemented and compared by calculating the number of correctly classified samples of each method. 99.4% of correct classifications were obtained by using cross-validation and selecting the most appropriate algorithms. The results indicate that the samples were correctly classified through the implementation of a simple and low cost measurement protocol.Fil: Vorobioff, Juan. Comisión Nacional de Energía Atómica; ArgentinaFil: Adaro, Mauricio Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich". Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Boggio, Norberto Gabriel. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Magallanes, J.. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Boselli, A.. Comisión Nacional de Energía Atómica; ArgentinaFil: Lamagna, Federico Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; ArgentinaFil: Rinaldi, Carlos Alberto. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Single wall carbon nanotubes (SWCNTs) have been found to be sensitive to gases, temperature and b... more Single wall carbon nanotubes (SWCNTs) have been found to be sensitive to gases, temperature and biological molecules, and have shown great promise as sensing elements. We developed SWCNTs sensors chemically functionalized with the COOH groups by oxidation and demostrated that the sensors are sensitive to changes in humidity.
Two different techniques were used for manufacturing thin films of SnO2: RGTO [1] and pore wettin... more Two different techniques were used for manufacturing thin films of SnO2: RGTO [1] and pore wetting [2-4]. From the first one, a microstructure formed by nanograins obtained and from the second, a microstructure consisting of nanotubes. These would permit understand the relationship between the microstructure and the electrical response of the thin film. The film of SnO2 nanotubes shows good
ABSTRACT Gas sensors TiO2 based were prepared by anodic oxidation method. Morphology of the TiO2 ... more ABSTRACT Gas sensors TiO2 based were prepared by anodic oxidation method. Morphology of the TiO2 nanostructures were characterized by scanning electron microscopy (SEM), Xray diffraction (XRD) and Raman spectroscopy. At room temperature, the sensors exhibited highly sensitive and fast response-recovery (less than 2 min) to NH3 gas of concentrations ranging from 50 to 200 ppm.
ABSTRACT Using the cross flow ion mobility spectrometry (CFIMS) concept, together with a pulsed c... more ABSTRACT Using the cross flow ion mobility spectrometry (CFIMS) concept, together with a pulsed corona discharge ionization source, a prototype of IMS cell type device was constructed and tested. In this work, we report the experimental conditions to set up the instrument and the analytical results based on the principal components analysis (PCA) obtained in the detection of toluene, acetone, ethanol and isoamyl acetate on gas phase. The advantages of this new design are the high ions concentration obtained compared to the commonly used 63Ni source, the simplicity of the CFIMS and the rapid response time.
Se presenta el estado de avance del desarrollo de celdas solares de silicio monocristalino en la ... more Se presenta el estado de avance del desarrollo de celdas solares de silicio monocristalino en la CNEA. Se elaboraron celdas solares a partir de obleas de silicio cristalino tipo p, obteniendo las junturas frontal y posterior por difusion de los dopantes en una sola etapa. Los contactos metalicos se realizaron por evaporacion en vacio y posterior engrosamiento electrolitico. Se analizaron y utilizaron diversos tratamientos antirreflectantes sobre la cara frontal. Los desarrollos realizados permitieron disenar, elaborar y caracterizar, por primera vez en el pais, celdas fotovoltaicas de silicio cristalino con eficiencias superiores a las de dispositivos comerciales del mismo tipo. En particular, se obtuvieron valores de tension de circuito abierto superiores a 600mV, corriente de cortocircuito de 34mA/cm2 , factor de llenado ("fill factor") de 0.80, y eficiencias entre el 14% y el 15%.
ABSTRACT Abstract : The majority of the high energy ion beam micro-machining work has been carrie... more ABSTRACT Abstract : The majority of the high energy ion beam micro-machining work has been carried out using MeV protons. This direct write-process was used to produce 3D structures in different type of materials.
This paper presents the fabrication and characterization of a sensor based on a nanostructured Cu... more This paper presents the fabrication and characterization of a sensor based on a nanostructured CuO thin film on a silicon substrate. We evaluated the sensitivity and selectivity of the sensor to ethyl or isopropyl alcohol at room temperature in the absence and presence of green light. Measurements of sensor responses on both light conditions show repetitive changes in selectivity, presumably based on sustancial changes in chemical interactions of analyte with excited nano-structured CuO thin film.
Gas sensors TiO2 based were prepared by anodic oxidation method. The morphology of the TiO2 nanos... more Gas sensors TiO2 based were prepared by anodic oxidation method. The morphology of the TiO2 nanostructures were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) and Raman spectroscopy. The gas sensing properties of TiO2 nanotubes exposed CO have been tested in a wide range of operating temperatures. The sensor using the fabricated nanotube arrays as the sensing elements demonstrated a good response to different concentrations of carbon monoxide from 480 to 850 ppm at 350 °C.
In the present work the classification of dairies additives in a rapid and simple way, is propose... more In the present work the classification of dairies additives in a rapid and simple way, is proposed. Measurements were made by means of an Electronic Nose developed in our laboratories, which we named 'Patagonia E-Nose.' This E-Nose is composed of SnO2 sensors located in a thermally stabilized chamber which improves the repeatability of the measurements. Samples of various hydrolyzed dairies were measured using air as a reference gas. Then, the integrals of the signals were analyzed using a combination of different multivariate chemometric methods such as linear discriminant analysis (LDA), principal components analysis (PCA), back-propagation neural network and different classifiers. Also, different algorithms were implemented and compared by calculating the number of correctly classified samples of each method. 99.4% of correct classifications were obtained by using cross-validation and selecting the most appropriate algorithms. The results indicate that the samples were correctly classified through the implementation of a simple and low cost measurement protocol.Fil: Vorobioff, Juan. Comisión Nacional de Energía Atómica; ArgentinaFil: Adaro, Mauricio Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich". Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Boggio, Norberto Gabriel. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Magallanes, J.. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Boselli, A.. Comisión Nacional de Energía Atómica; ArgentinaFil: Lamagna, Federico Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; ArgentinaFil: Rinaldi, Carlos Alberto. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Single wall carbon nanotubes (SWCNTs) have been found to be sensitive to gases, temperature and b... more Single wall carbon nanotubes (SWCNTs) have been found to be sensitive to gases, temperature and biological molecules, and have shown great promise as sensing elements. We developed SWCNTs sensors chemically functionalized with the COOH groups by oxidation and demostrated that the sensors are sensitive to changes in humidity.
Two different techniques were used for manufacturing thin films of SnO2: RGTO [1] and pore wettin... more Two different techniques were used for manufacturing thin films of SnO2: RGTO [1] and pore wetting [2-4]. From the first one, a microstructure formed by nanograins obtained and from the second, a microstructure consisting of nanotubes. These would permit understand the relationship between the microstructure and the electrical response of the thin film. The film of SnO2 nanotubes shows good
ABSTRACT Gas sensors TiO2 based were prepared by anodic oxidation method. Morphology of the TiO2 ... more ABSTRACT Gas sensors TiO2 based were prepared by anodic oxidation method. Morphology of the TiO2 nanostructures were characterized by scanning electron microscopy (SEM), Xray diffraction (XRD) and Raman spectroscopy. At room temperature, the sensors exhibited highly sensitive and fast response-recovery (less than 2 min) to NH3 gas of concentrations ranging from 50 to 200 ppm.
ABSTRACT Using the cross flow ion mobility spectrometry (CFIMS) concept, together with a pulsed c... more ABSTRACT Using the cross flow ion mobility spectrometry (CFIMS) concept, together with a pulsed corona discharge ionization source, a prototype of IMS cell type device was constructed and tested. In this work, we report the experimental conditions to set up the instrument and the analytical results based on the principal components analysis (PCA) obtained in the detection of toluene, acetone, ethanol and isoamyl acetate on gas phase. The advantages of this new design are the high ions concentration obtained compared to the commonly used 63Ni source, the simplicity of the CFIMS and the rapid response time.
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Papers by Alberto Lamagna