Core-double shell ZnO@In2O3@ZnO hollow microspheres for superior ethanol gas sensing

ZnFe2O4 Nanoparticles on ZIF-8-Derived ZnO for Enhanced Acetone Sensing

“…However, the effect for O i is the opposite . According to eq , the transformation of lattice oxygen into oxygen vacancies is accompanied by the formation of oxygen atoms and two free electrons, which will provide sufficient opportunities for oxygen adsorption on the surface . XPS and PL results fully demonstrate that there is more oxygen adsorption for the ZFO-3 material as a favorable condition for its gas-sensing performances. O O false( normallatt false) → V O • • + 1 / 2 O 2 + 2 e − …”

Nitrogen doped In2O3–ZnO nanocomposite mesoporous thin film based highly sensitive and selective ethanol sensors

“…For all the films, the O 1s peak has been deconvoluted into three peaks corresponding to metal–oxygen (∼529.4 eV), non-stoichiometric oxygen (∼530.4–530.6 eV) and surface adsorbed hydroxyl species (∼531.5–531.7 eV). 16,32 The peak corresponding to the adsorbed surface hydroxyl has been more pronounced for the IZO 50 film compared to the IZON films, which is attributed to reduced adsorption of water molecules on the nitrogen doped metal oxides. 33,34 The ratios of areas under curves A V / A L ( A V and A L are the area under the curve for non-stoichiometric and lattice oxygen, respectively) for IZON 25, IZON 50, IZON 75 and IZO 50 have been estimated to be 1.12, 1.17, 1.08 and 0.85 respectively.…”

“…The doublet peaks of In 3d and Zn 2p have been attributed to In 3+ and Zn 2+ states respectively. 16 In 3d peaks exhibit a rigid shift to a higher binding energy with an increase in the In 2 O 3 composition in the composites, whereas the Zn 2p peaks shifted to a lower binding energy . The opposite shift of In 3+ and Zn 2+ peaks has been attributed to the transfer of electrons from low work function In 2 O 3 to high work function ZnO across the nanoscale heterojunctions in the composites.…”

“…Our observations agree well with the existing literature reports on the significant improvement of reducing gas sensing properties of In 2 O 3 /ZnO heterojunction based sensors. 15,47 It is to be noted that the ethanol sensing performance has been significantly enhanced in the case of the nitrogen doped nanocomposite thin film sensor (IZON 50). The improvement of ethanol sensing performance in nanocomposite thin films has been primarily attributed to the formation of nanoscale heterojunctions between In 2 O 3 and ZnO.…”

“…14,15 In 2 O 3 and ZnO are two common SMOs that have been extensively studied for gas sensing. The composites and heterostructures of these two oxides in the form of microspheres, 16 nanosheets, 15 nanofibers 17 and nanowires 18 are reported for ethanol sensing applications. Even though the heterostructures displayed superior ethanol sensing performance compared to individual oxides, they still suffer from high operating temperature, slow response time and cross-sensitivity.…”