Influencia de la temperatura del sustrato de las películas de SnO2:Zn–1% obtenidas por rociado pirolítico sobre la sensibilidad en la detección de vapor de etanol
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Date
2024
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Universidad Nacional de Trujillo
Abstract
En el presente trabajo se estudió la Influencia de la temperatura del sustrato de las películas de SnO2:Zn–1% obtenidas por rociado pirolítico sobre la sensibilidad en la detección de vapor de etanol. Estas películas fueron depositadas sobre sustratos de vidrio (SLG) a temperaturas de síntesis de 300°C, 340°C, 380°C y 420°C, mediante la técnica de rociado pirolítico. Los difractogramas de DRX muestran una estructura tipo casiterita para las películas cuyas temperaturas de sustrato son de 380°C y 420°C, característica del SnO2. Del análisis de los espectros de FTIR revelaron que existen enlaces de Sn-O y Zn-O en los rangos de número de onda de 400 cm–1 hasta 1013 cm–1; evidenciándose que, al incrementar la temperatura de sustrato de las películas, existe una mayor presencia de enlaces Zn-O. Las imágenes por AFM muestran una tendencia a incrementar el tamaño y forma de los granos, así como también la rugosidad conforme aumenta la temperatura del sustrato. Respecto al espesor, para las películas sintetizadas de 340°C hasta 420°C tienden a incrementar desde 246 nm hasta 319 nm. De las propiedades ópticas para las películas cuyas temperaturas de sustrato son de 380°C y 420°C, los espectros de transmitancia son aproximadamente de 70% y 50%, respectivamente, y la absorbancia tiende a la región del espectro rojo (red shift); presentan un band gap entre 3,87 eV a 4,3 eV. Del estudio realizado sobre la sensibilidad de las películas de SnO2:Zn al 1% sobre la influencia de la temperatura de sustrato; se determinó, que la película a la temperatura de síntesis de 420°C es la más óptima, presentando una sensibilidad de 1,26 y un tiempo de sensado de 119 s.
In the present work, the influence of the substrate temperature of SnO2:Zn-1% films obtained by spray pyrolysis on the sensitivity in the detection of ethanol vapour was studied. These films were deposited on glass substrates (SLG) at synthesis temperatures of 300°C, 340°C, 380°C and 420°C, using the spray pyrolysis technique. The XRD diffractograms show a cassiterite-like structure for the films with substrate temperatures of 380°C and 420°C, characteristic of SnO2. Analysis of the FTIR spectra revealed that Sn-O and Zn-O bonds exist in the wavenumber ranges from 400 cm-1 to 1013 cm-1; it is evident that, as the substrate temperature of the films increases, there is a greater presence of Zn-O bonds. The AFM images show a tendency to increase grain size and shape, as well as roughness as the substrate temperature increases. Regarding the thickness, for films synthesised from 340°C to 420°C they tend to increase from 246 nm to 319 nm. From the optical properties for the films with substrate temperatures of 380°C and 420°C, the transmittance spectra are approximately 70% and 50%, respectively, and the absorbance tends to the red shift region; they show a band gap between 3,87 eV to 4,3 eV. From the study on the sensitivity of the 1% SnO2:Zn films on the influence of substrate temperature, it was determined that the film at the synthesis temperature of 420°C is the most optimal, with a sensitivity of 1,26 and a sensing time of 119 s.
In the present work, the influence of the substrate temperature of SnO2:Zn-1% films obtained by spray pyrolysis on the sensitivity in the detection of ethanol vapour was studied. These films were deposited on glass substrates (SLG) at synthesis temperatures of 300°C, 340°C, 380°C and 420°C, using the spray pyrolysis technique. The XRD diffractograms show a cassiterite-like structure for the films with substrate temperatures of 380°C and 420°C, characteristic of SnO2. Analysis of the FTIR spectra revealed that Sn-O and Zn-O bonds exist in the wavenumber ranges from 400 cm-1 to 1013 cm-1; it is evident that, as the substrate temperature of the films increases, there is a greater presence of Zn-O bonds. The AFM images show a tendency to increase grain size and shape, as well as roughness as the substrate temperature increases. Regarding the thickness, for films synthesised from 340°C to 420°C they tend to increase from 246 nm to 319 nm. From the optical properties for the films with substrate temperatures of 380°C and 420°C, the transmittance spectra are approximately 70% and 50%, respectively, and the absorbance tends to the red shift region; they show a band gap between 3,87 eV to 4,3 eV. From the study on the sensitivity of the 1% SnO2:Zn films on the influence of substrate temperature, it was determined that the film at the synthesis temperature of 420°C is the most optimal, with a sensitivity of 1,26 and a sensing time of 119 s.
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Keywords
Películas delgada de SnO2:Zn, Rociado pirolítico, Sensor de gas