Highly selective H2 gas sensor fabricated via growth of PtAu/SnW3O9 nanosheet arrays on planar substrate
摘要
The in-situ growth of sensitive materials has progressively emerged as a prevalent trend. In this paper, SnW3O9 nanosheet arrays are synthesized by aerosol-assisted chemical vapor deposition (AACVD), which is a method for in-situ preparation of sensitive films for gas sensors. Subsequently, Pt-Au is loaded onto the SnW3O9 nanosheet arrays by the wet impregnation process. Ultimately, a H2 sensor with high selectivity was successfully fabricated. At the optimum operating temperature of 310 °C, the response value of PtAu/SnW3O9-30 sensor to 100 ppm H2 is 6.5 times of 100 ppm NH3, 7.6 times of 100 ppm CO and 10.1 times of 100 ppm CH4. Meanwhile, the sensor performs excellent anti-interference capability under the mixed gases between 100 ppm H2 and 100 ppm CO, CO2 and CH4, respectively. In addition, the sensor has good stability with different relative humidity. The excellent gas sensing performance of the sensor can primarily be attributed to the unique morphology of SnW3O9 nanosheet arrays and the introduction of Pt-Au. The in-situ growth of PtAu/SnW3O9 nanosheet arrays on planar substrate can be great potential for application in fabricating highly selective H2 gas sensor.