Design of a dual-function antenna for microwave gas detection and communication in industrial wireless sensor network applications

High humidity enhanced surface acoustic wave (SAW) H2S sensors based on sol–gel CuO films

“…Raman spectra of the sensitive films before and after exposure to H2S are shown in Fig. 4, in which the peaks at 292 cm -1 , 339 cm -1 and 626 cm -1 are corresponding to Ag (296 cm -1 ), Bg (1) (346 cm -1 ), and Bg (2) (636cm -1 ) modes of CuO crystals [27], respectively. The results in Fig.…”

“…Precision detection of hazardous gases (such as NH3, NO, NO2, CO, H2S) has become crucial in recent years due to wide applications of explosives, combustible, flammable and toxic gases in industry, military and daily activities [1][2][3][4][5]. Among these toxic gases, hydrogen sulfide (H2S), a colorless gas with foul odor like rotten eggs, is generally produced in decomposition of organic matters, human and animal's wastes, food processing, cooking stove, craft paper mills, tanneries, oil refineries and other industrial activities [6][7][8][9][10].…”