Facile synthesis and enhanced H2S sensing performances of Fe-doped α-MoO3 micro-structures

Intrinsic characteristic and mechanism in enhancing H2S sensing of Cd-doped α-MoO3 nanobelts

“…(8) and (9)) and release a few trapped electrons back to the conduction band (Fig. 12B1-B2), which results in a decrease in the concentration of surface oxygen species and eventually leads to a decrease in the surface resistance of the undoped and Cd-doped MoO 3 nanobelts [16,17].…”

“…So, various attempts have been employed to improve the gas sensing properties of MoO 3 . [1,16,17]. Doping of metal elements already has been proved to be one of the most facial and effective methods in improving the sensing performances of semiconductor metal oxides, because doping can effectively modulates the parameters of crystal structure and band structures of oxide nanocrystals.…”

“…Doping of metal elements already has been proved to be one of the most facial and effective methods in improving the sensing performances of semiconductor metal oxides, because doping can effectively modulates the parameters of crystal structure and band structures of oxide nanocrystals. Apart from expensive noble metals, the transition metal and rare-earth ion can be used as dopants [17]. The Cd doping of nanostructured semiconductor metal oxides has been a very active research area in the last few years, mostly due to the interesting photocatalytic properties of them.…”

Molybdenum trioxide nanopaper as a dual gas sensor for detecting trimethylamine and hydrogen sulfide

“…To date, various metal-oxide semiconductors have been investigated for the detection of TMA and H 2 S. TiO 2 , WO 3 , MoO 3 , and LaFeO 3 exhibit good sensing performance toward TMA, [21][22][23][24][25] and ZnO, SnO 2 , WO 3 , CuO, MoO 3 , and BaCoO 3 have been used to detect H 2 S. [26][27][28][29][30][31][32][33] Note that, molybdenum trioxide (MoO 3 ), which has abundant Lewis-acid sites, exhibits a high reactivity to both TMA and H 2 S, probably because of its high chemical affinity to H 2 S and strong interaction with basic TMA. 15,24 This suggests the possibility of the simultaneous detection of ubiquitous offensive odors (TMA and H 2 S) using a single gas sensor.…”

Self-assembly gridding α-MoO3 nanobelts for highly toxic H2S gas sensors

“…American Conference of Government Industrial Hygienists (ACGIH) has established H2S gas safety standards with the threshold limit value of 10 ppm. [1][2][3] When the concentration of H2S is higher than 250 ppm, it may bring about death. Therefore, it is of great interest to develop a reliable and effective H2S gas sensor.…”