Toward hydrogen detection at room temperature with printed ZnO nanoceramics films activated with halogen lighting
Idioma
en
Article de revue
Este ítem está publicado en
Applied Surface Science. 2015-12-01, vol. 357, n° Part A, p. 14-21
Elsevier
Resumen en inglés
Though semiconducting properties of ZnO have been extensively investigated under hazardous gases, research is still necessary for low-cost sensors working at room temperature. Study of printed ZnO nanopowders-based sensors ...Leer más >
Though semiconducting properties of ZnO have been extensively investigated under hazardous gases, research is still necessary for low-cost sensors working at room temperature. Study of printed ZnO nanopowders-based sensors has been undertaken for hydrogen detection. A ZnO paste made with commercial nanopowders is deposited onto interdigitated Pt electrodes and sintered at 400 °C. The ZnO layer structure and morphology are first examined by XRD, SEM, AFM and emission/excitation spectra prior to the study of the effect of UV-light on the electrical conduction of the semiconductor oxide. The response to hydrogen exposure is subsequently examined, showing that low UV-light provided by halogen lighting enhances the gas response and allows detection at room temperature with gas responses similar to those obtained in dark conditions at 150 °C. A gas response of 44% (relative change in current) under 300 ppm is obtained at room temperature. Moreover, it is demonstrated that very low UV-light power (15 μW/mm2) provided by the halogen lamp is sufficient to give sensitivities as high as those for much higher powers obtained with a UV LED (7.7 mW/mm2). These results are comparable to those obtained by others for 1D or 2D ZnO nanostructures working at room temperature or at temperatures up to 250 °C.< Leer menos
Palabras clave en inglés
ZnO
Nanoparticles
Screen-printing
Gas sensor
Hydrogen
Halogen activation
Proyecto ANR
Matériaux avancés pour capteurs optiques. - ANR-10-BLAN-0820
Orígen
Importado de HalCentros de investigación