WO_x matchhead-capped ZnO nanorods for gas-blocking and light-masking behavior

Abstract

In this study, matchhead WOx-capped ZnO nanorods (NRs) were formed by hydrothermal and sputtering processes. In order to examine the morphology and material properties, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction were performed. Amorphous circular-shaped WOx heads were successfully grown on top of ZnO NRs. In order to explore the optical and gas responses of the nanostructures, UV-light responses and H2 gas responses were measured for pure ZnO NRs and WOx/ZnO NRs. The results indicate that the WOx matchhead cap can function like an umbrella to block the light absorption and gas reaction. Furthermore, the light and gas response times were lengthened due to the coverage of the WOx match head. WOx matchhead/ZnO nanocomposites can function as light and gas modulation components for optoelectronic devices.

UV Light and H₂ Gas Dual Sensing Properties of ZnO/InGaZnO Match-Head Nanorods

“…Different from the shapes of the ZnO/WO3 match-head rod and ZnO/ZnS coreshell rod, the ZnO/IGZO rod resembled two capsules (one inside and one outside), as shown in Fig. 1(b) [6]. Moreover, ZnO-based nanostructures on a sensing device with two interdigital electrodes are shown in Fig.…”

“…2 (d), only ZnO crystallized phases could be observed, while no IGZ-O crystallized phases could be seen in the XRD patterns. Like the sputtered WO3 on ZnO NRs, sputtered IGZO may also be amorphous [6]. For oxygen in different chemical states, the peaks of O at 531eV, 532eV and, 533 eV are attributed to Zn-O-Zn (metal oxide), Zn-OH (oxygen defect) and Zn-O-R (organic residue), as shown in Fig.…”