Selective, sensitive, and reversible detection of H₂S using Mo-doped ZnO nanowire network sensors

Abstract

Selective, sensitive and reversible detection of H2S was achieved using Mo-doped ZnO nanowire networks prepared by using CVD and SILAR methods.

SiO2 substrate and Mo,In codoping effect on crystalline and vibrational characteristics of ZnO sprayed thin films

“…The absence of an MoO 3 phase or Mo metal in the lattice ZnO:Mo:In was confirmed by both XRD and EDS techniques. These results are in good agreement with those of Woo et al [20], indicating no phase of MoO 3 and complete doping Mo in the lattices of ZnO:Mo:In thin films. The EDS analysis showed the presence of indium at different binding energies of low intensities, which was not revealed by XRD [30][31][32].…”

“…They could be attributed to oxygen deficiency and/or oxygen adsorption phenomena in the form of molecule and atoms: O À 2 ; O À et O 2À [20,29]. The mass analysis of the compounds under investigation by EDS revealed the presence of O, Zn and In chemical elements doping to low intensities (Fig.…”

“…They involved a reduction in the unit cell volume (V u-crystal = 47.63 Å A 0 3 ), presumably due to the substitutional and interstitial incorporation of Mo and In atoms in the ZnO lattice. The literature indicates that the Mo 6+ ionic radius is between 0.055 and 0.062 nm [20], well below the current value of 0.074 nm recorded for Zn 2+ [19,21]. The electronegativity of Mo (2.16) is also higher than that of Zn (1.65), which allowed the Mo 6+ ion to attract the Zn 2+ electrons and take its place easily while releasing four electrons in the band gap and rendering the Zn 2+ interstitial in the donor state.…”

Fabrication and characterization of highly-ordered Zinc Oxide nanorods on gold/glass electrode, and its application as a voltammetric sensor

“…ZnO can be synthesized at different single crystal forms, such as, thin films [4,5], and it is enriched with number of one-dimensional morphologies, including nanobelts [6], nanowire [7,8] and nano rod [9]. The use of single crystal substrates for the growth of ZnO nanostructures makes the ZnO as ideal platform for development of electronics applications.…”

Ultrasensitive and ultraselective detection of H2S using electrospun CuO-loaded In2O3 nanofiber sensors assisted by pulse heating

“…Hydrogen sulfide (H 2 S) is a representative inflammable gas and exists in nature or is generated industrially in areas such as natural gas processing, petroleum refining, petrochemical plants, kraft mills, coke ovens, and coal gasifiers [1][2][3][4]. Exposure to low concentration of H 2 S is known to affect the human nervous system and may cause loss of consciousness up to death by chemical asphyxiation.…”