Highly selective H2 gas sensor fabricated via growth of PtAu/SnW3O9 nanosheet arrays on planar substrate

The in-situ growth of sensitive materials has progressively emerged as a prevalent trend. In this paper, SnW 3 O 9 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 SnW 3 O 9 nanosheet arrays by the wet impregnation process. Ultimately, a H 2 sensor with high selectivity was successfully fabricated. At the optimum operating temperature of 310 °C, the response value of PtAu/SnW 3 O 9 -30 sensor to 100 ppm H 2 is 6.5 times of 100 ppm NH 3 , 7.6 times of 100 ppm CO and 10.1 times of 100 ppm CH 4 . Meanwhile, the sensor performs excellent anti-interference capability under the mixed gases between 100 ppm H 2 and 100 ppm CO, CO 2 and CH 4 , 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 SnW 3 O 9 nanosheet arrays and the introduction of Pt-Au. The in-situ growth of PtAu/SnW 3 O 9 nanosheet arrays on planar substrate can be great potential for application in fabricating highly selective H 2 gas sensor.