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XRD patterns of ZnS nanobelts.
(a) SEM image of ZnS nanobelts; the inset is Au–ZnS alloy nanoparticle at the tip of nanobelt. (b) High-resolution TEM image of ZnS nanobelts; the inset is the selected area electron diffraction (SAED) patterns of ZnS nanobelts. (c) SEM image of the oxygen-sensing device. (d) Photoluminescence spectra of ZnS nanobelts.
Response of ZnS nanobelt to different oxygen pressures without or with UV illumination; the inset shows the logarithmic oxygen pressure dependence of conductance of ZnS nanobelt.
Schematic energy band illustration of response to UV illumination and the interaction with oxygen. (a) Without illumination, the adsorption of oxygen molecules traps electrons from ZnS nanobelt. (b) Under illumination, the chemisorbed oxygen ions trap the photoexcited holes and liberate from the surface of ZnS nanobelt.
Four cycle switching between low and high conductance states. The oxygen pressure is and the bias applied to the nanobelt is .
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