H2 sensing performance of optical fiber coated with nano-platelet WO3 film

• DOI: 10.1016/j.snb.2011.01.033
• Publication Date: 2012-03-30T08:43:13Z
• Authors: J.Z. Ou; M.H. Yaacob; J.L. Campbell; M. Breedon; K. Kalantar-zadeh; W. Wlodarski
• Keywords: Optical fiber sensor; 02 engineering and technology; 01 natural sciences; H2 sensor; Tungsten trioxide; WO3; 0103 physical sciences; Pd; 0210 nano-technology; Engineering(all)

AbstractGas sensing performance of optical fibers coated with nano-platelet tungsten trioxide (WO3) films and catalytic palladium (Pd) layers were investigated for low concentration hydrogen gas (H2). Nano-platelet WO3 film was formed on the tip of the multimode optical fiber via acid treatment of RF sputtered tungsten (W). After annealing, Pd layer of 25 Å was sputtered as a catalyst. It was found that the optical fiber gas sensor based on the Pd/nano-platelet WO3 film shows a remarkable reflectance response towards very low H2 concentration (0.06%) in synthetic air balance.