Sample records for OXIDOS DE ESTA?O (tin oxides)
from WorldWideScience.org

Sample records 1 - 9 shown.



1

USO DE MÉTODOS QUÍMICOS PARA LA OBTENCIÓN DE SENSORES DE GAS DEL SISTEMA Sn-Sb/ USE OF CHEMICAL METHODS TO OBTAIN Sn-Sb GAS SENSOR

MONTENEGRO, ALEJANDRA; PONCE, MIGUEL; CASTRO, MIRIAM; RODRÍGUEZ, JORGE
2007-03-01

Resumen en español Los sensores de gas basados en óxidos semiconductores presentan un cambio en la resistencia cuando son expuestos a ciertos gases. El óxido de estaño, SnO2, es el compuesto más utilizado en la fabricación de sensores de gas, y con el fin de mejorar su eficiencia normalmente se le adicionan óxidos de paladio, bismuto, antimonio entre otros. Durante el desarrollo de este trabajo se realizó la síntesis de polvos cerámicos del sistema SnO2 –Sb2O3 utilizando los méto (mas) dos de precipitación y precursor polimérico (Pechini). Los polvos cerámicos fueron caracterizados con ATD/TG, DRX y FTIR. Además, se muestra la microestructura obtenida por MEB y el comportamiento eléctrico de películas gruesas conformadas con los polvos cerámicos obtenidos sobre substratos de alúmina, determinando el cambio de la resistencia eléctrica del sistema en función del tiempo de exposición a una atmósfera (oxígeno o monóxido de carbono). El principal interés de este trabajo fue determinar el efecto del método de síntesis, así como el de la concentración de Sb2O3 como aditivo, sobre las propiedades sensoras de sistemas con base en SnO2 Resumen en inglés Semiconductor metal oxide-based gas sensors change their resistance when they are exposed to certain gases. Tin oxide, SnO2, is the dominant compound in gas sensors production; however its efficiency is generally improved by adding additives as palladium, bismuth, antimony oxides among others. In this work, SnO2-Sb2O3 ceramic powders were obtained by using precipitation methods and polymeric precursor (Pechini) methods. The ceramic powders were characterized through DTA/T (mas) G, XRD and FTIR. Using the resulting powders, thick films were conformed onto alumina substrates. SEM micrographs and electrical response at several atmospheres, sensitivity and stability of the gas sensor were recorder. This paper focuses on the influence of the synthesis method, as well as the effect of the Sb2O3 concentration on the sensor properties.

Scientific Electronic Library Online (Spanish)

2

Whiskers in indium tin oxide films obtained by electron beam evaporation

Castañeda, S. I.; Rueda, F.; Díaz, R.; Ripalda, J. María; Montero Herrero, Isabel
1998-02-15

Digital.CSIC (Spain)

3

Tin–carbon composites as anodic material in Li-ion batteries obtained by copyrolysis of petroleum vacuum residue and SnO2

Tirado, J. L.; Santamaría Ramírez, Ricardo; Ortiz, G. F.; Menéndez López, Rosa M.ª; Lavela, P.; Jiménez-Mateos, J. M.; Gómez García, F. J.; Concheso Álvarez, Alejandro; Alcántara, R.
2007-04-02

Digital.CSIC (Spain)

4

Preparation of ZnO-SnO2 ceramic materials by a coprecipitation method

Peiteado, Marco; Iglesias Vega, Yolanda; Frutos, J. de; Fernández Lozano, José Francisco; Caballero Cuesta, Amador
2006-05-01

Digital.CSIC (Spain)

5

Naturaleza y formación de los complejos intermedios del sistema SnCl2 - NH4OH - H2O

Ortiz, A.; Mendoza, M.; Rodríguez Paez, J.E.
2001-10-01

Resumen en inglés Current technological advances require that the raw materials used in the production of electric devices and structural materials present special characteristics of chemical purity, size distribution and morphology of the particles. Tin oxides are mainly used as gas sensor and as surges suppressor (varistor). To achieve an appropriate control on the mentioned characteristics, we use the method of controlled precipitation (MPC), which allowed us to obtain certain character (mas) istics in other oxides. When using the MPC, it is necessary to determine the complexes that are formed and their nature. In this work we present results of study on the formation of complexes in the system SnCl2 - NH4OH - H2O. To study the system during the constant addition of the base (NH4OH) to the solution of tin salt, we used potentiometric and conductimetric titration. For the determination of the nature of the formed tin complexes, the solid phase was characterized using X-ray diffraction (XRD) while the liquid phase was analyzed by UV-visible and infrared spectroscopies.

Scientific Electronic Library Online (Spanish)

6

Microstructural development of tin-doped ZnO bulk ceramics

Peiteado, Marco; Iglesias, Y.; Fernández Lozano, José Francisco; Frutos, J. de; Caballero, A. C.
2007-01-01

Digital.CSIC (Spain)

8

Electrocatalytic oxidation of nitrite to nitrate mediated by Fe(III) poly-3-aminophenyl porphyrin grown on five different electrode surfaces

Armijo, Francisco; Goya, M. Carmen; Reina, Matías; Canales, M. Josefina; Arévalo, Maria Carmen; Aguirre, M. Jesús
2007-05-01

Digital.CSIC (Spain)

9

Combustion synthesis and EIS characterization of TiO2–SnO2 system

Chinarro Martín, Eva; Moreno Burriel, Berta; Jurado Egea, José Ramón
2007-01-01

Digital.CSIC (Spain)