Hydrogen incorporation in gasochromic coloration of sol–gel WO3 thin films

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

“…3(b). These plots demonstrated a non-linear relationship seemingly similar to the results as found in the literature [18][19][20]. We therefore concluded that absorbance was not proportional to the hydrogen gas concentration in a nitrogen atmosphere.…”

“…However, Chan, W.C. Hsu, Chang, and C.S. Hsu has further reported in 2011 that the absorbance plots against the partial pressure of the hydrogen gas in the nitrogen base gas reveal a nonlinear regression [18]. Sekimoto et al and Ghosh et al [19,20] reported that the absorbance of noble metal loaded WO 3 sensors was not proportional to hydrogen gas concentration.…”

Improved performance of fiber optic hydrogen sensor based on WO3-Pd2Pt-Pt composite film and self-referenced demodulation method

“…2(a), which proves the prepared WO 3 film has amorphous structure. It has been reported [30] that amorphous WO 3 has better hydrogen sensitivity. Therefore, the baking temperature of optical fiber tip should be controlled at a proper value during depositing process of WO 3 .…”

Optical Fiber Grating Hydrogen Sensors: A Review

“…WO 3 film has a good gasochromic effect in hydrogen atmosphere when Pd [50] or Pt [51] is employed as catalyst. A single-mode fiber inscribed with high-low reflective Bragg gratings was deposited with WO 3 -Pd-Pt composite film for hydrogen sensing [42].…”