Improved H2-sensing performance of nanocluster-based highly porous tungsten oxide films operating at moderate temperature

Fiber optic hydrogen sensors: a review

“…14 transforms to Pt after the first hydrogen response, which proves PtCl 2 can generate Pt efficiently in the presence of hydrogen. Moreover, the performance of the Pt-loaded WO 3 coating becomes better due to the generation of the Pt catalyst, which is similar to the gasochromic coloring effect of WO 3 using PdCl 2 as the hydrogen catalyst [49,50]. H 2 PtCl 6 •6H 2 O can transform to Pt more efficiently under the higher annealing temperature, but the hydrogen sensitivity of the Pt-loaded WO 3 coating will decrease due to the crystallization of WO 3 [51,52].…”

“…These results show the FBG hydrogen sensor has the better sensitivity at the higher ambient temperature. Since WO 3 is a semiconductor material [49], its band gap may be increased at the lower temperature, which has a bad effect on the transmission of H + and eduring the hydrogen response. Therefore, the energy released by exothermic reaction will be reduced, resulting in a decline of the sensitivity of the FBG hydrogen sensor.…”

Influence of oxygen gas concentration on hydrogen sensing of Pt/WO3 thin film prepared by sol–gel process

“…WO 3 thin films with numerous pores and large surface areas displayed the superior Additionally, the electrical conductivity of Pt/WO 3 increases under the hydrogen gas atmosphere due to the injection of protons and electrons, which work as electrical carriers. Thus, Pt/WO 3 thin films can detect hydrogen gas through the change of its electrical conductivity [9][10][11][12][13]. In this study, we also utilized Pt/WO 3 thin films as a hydrogen-gas leakage sensor.…”

“…Nakagawa et al reported that the electrical conductivity of Pt/WO 3 film is disproportionate to nitrogen-diluted hydrogen [9]. In comparison, Zhao and Ong reported that the electrical resistance of Pd/WO 3 film has a linear relationship with the hydrogen gas concentration in air [13].…”

Fiber Bragg grating sensors with Pt-loaded WO3 coatings for hydrogen concentration detection down to 200 ppm

“…These results show that the FBG hydrogen sensor has better sensitivity at higher ambient temperatures. Because WO 3 is a semiconductor material [25,26], its band gap may be increased at lower temperatures, which has negative effects on the transmission of H + and e − during hydrogen response. Therefore, the energy released by the exothermic reaction will be reduced, resulting in the decline of sensitivity of the FBG hydrogen sensor.…”