Jose Solis - Academia.edu (original) (raw)
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Papers by Jose Solis
IEEE Sensors Journal, 2005
Sensing techniques are often required to not only be versatile and portable, but also to be able ... more Sensing techniques are often required to not only be versatile and portable, but also to be able to enhance sensor information. This paper describes and demonstrates a new approach to chemical signal analysis that we call fluctuation-enhanced sensing. It utilizes the entire bandwidth of the sensor signal in contrast to more conventional approaches that rely on the dc response. The new principle holds prospects for significantly reducing the necessary number of sensors in artificial noses and tongues, and it can provide improved sensitivity.
A spray pyrolysis technique was used to obtain ZnO:X films doped with different elements, Xs Al, ... more A spray pyrolysis technique was used to obtain ZnO:X films doped with different elements, Xs Al, In, Cu, Fe and Sn. X-Ray diffraction, transmission electron microscopy and scanning electron microscopy were used to study the microstructure and surface morphology of the films. From the microstructural analysis, we can conclude that the amount as well as the type of dopant modifies the microstructure and surface morphology. Since it goes from non-oriented growth, for undoped films, to Ž. Ž. strongly 002 oriented, at intermediate ; 1 at.% doping level; and finally again to non-oriented and poor crystallinity, at high Ž. Ž .) 3 at.% doping level. The sensitivity of the films was studied in two steps: first as a function of their temperature 435᎐675 K Ž. Ž. for a fixed ethanol concentration 40 ppm and secondly as a function of ethanol concentration 4᎐100 ppm for a fixed Ž. temperature 675 K. A better sensitivity can be observed for Sn-and Al-doped films, with a dopantrZn ratio of 0.4 at.
IEEE Sensors Journal, 2005
Sensing techniques are often required to not only be versatile and portable, but also to be able ... more Sensing techniques are often required to not only be versatile and portable, but also to be able to enhance sensor information. This paper describes and demonstrates a new approach to chemical signal analysis that we call fluctuation-enhanced sensing. It utilizes the entire bandwidth of the sensor signal in contrast to more conventional approaches that rely on the dc response. The new principle holds prospects for significantly reducing the necessary number of sensors in artificial noses and tongues, and it can provide improved sensitivity.
A spray pyrolysis technique was used to obtain ZnO:X films doped with different elements, Xs Al, ... more A spray pyrolysis technique was used to obtain ZnO:X films doped with different elements, Xs Al, In, Cu, Fe and Sn. X-Ray diffraction, transmission electron microscopy and scanning electron microscopy were used to study the microstructure and surface morphology of the films. From the microstructural analysis, we can conclude that the amount as well as the type of dopant modifies the microstructure and surface morphology. Since it goes from non-oriented growth, for undoped films, to Ž. Ž. strongly 002 oriented, at intermediate ; 1 at.% doping level; and finally again to non-oriented and poor crystallinity, at high Ž. Ž .) 3 at.% doping level. The sensitivity of the films was studied in two steps: first as a function of their temperature 435᎐675 K Ž. Ž. for a fixed ethanol concentration 40 ppm and secondly as a function of ethanol concentration 4᎐100 ppm for a fixed Ž. temperature 675 K. A better sensitivity can be observed for Sn-and Al-doped films, with a dopantrZn ratio of 0.4 at.