Resumen
In this work, we show a simple way to functionalize tungsten oxide nanowires (WO 3 -NWs) using a saturated palladium chloride (PdCl 2 ) solution deposited by a drop-casting method. WO 3 -NWs were synthesized by close-spaced chemical vapor deposition (CSVT). The morphological and structural characterizations showed that the diameters of WO 3 -NWs are in the range from 50 to 200 nm with lengths above 10 μm, and correspond to the orthorhombic phase of WO 3 , respectively. The sensor was fabricated using the WO 3 -NWs and tested with hydrogen and volatile organic compounds (VCO's). A comparative study was done on the sensing performance, before and after the Palladium functionalization of the WO 3 -NWs, considering a wide range of gas concentrations and moderate operating temperatures (100-400 °C). The results show that this simple functionalization process significantly increases the sensor sensitivity and reduces the time constants. In addition, it has been shown that at 300 °C the decorated sensor becomes more selective to hydrogen and xylene for all concentrations considered in this research. Finally, the mechanisms involved in improving the gas sensing properties of WO 3 -NWs functionalized with Palladium are discussed.
Idioma original | Inglés |
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Páginas (desde-hasta) | 28-35 |
Número de páginas | 8 |
Publicación | Applied Surface Science |
Volumen | 275 |
DOI | |
Estado | Publicada - 15 jun. 2013 |