Sensing device applications of low-dimensional ZnS semiconductor materials
碩士 === 國立臺灣海洋大學 === 材料工程研究所 === 103 === This thesis investigates humidity sensing applications of ZnS spheres and gas sensing applications.of ZnS heterojunction structure and the tubular structure. We successfully prepared Au-nanoparticle-decorated ZnS (ZnS-Au) spheres by sputtering Au ultrathin fil...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2015
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| Online Access: | http://ndltd.ncl.edu.tw/handle/51240117264001414071 |
| Summary: | 碩士 === 國立臺灣海洋大學 === 材料工程研究所 === 103 === This thesis investigates humidity sensing applications of ZnS spheres and gas sensing applications.of ZnS heterojunction structure and the tubular structure. We successfully prepared Au-nanoparticle-decorated ZnS (ZnS-Au) spheres by sputtering Au ultrathin films on surfaces of hydrothermally synthesized ZnS spheres and subsequently postannealed the samples in a high-vacuum atmosphere. The Au nanoparticles were distributed on ZnS surfaces without substantial aggregation. The Au nanoparticle diameter range was 5 to 10 nm. Structural information showed that the surface of the annealed ZnS-Au spheres became more irregular and rough. A humidity sensor constructed using the Au-nanoparticle-decorated ZnS spheres demonstrated a substantially improved response to the cyclic change in humidity from 11% relative humidity (RH) to 33% to 95% RH at room temperature. Moreover, ZnS crystallites with a core-shell heterostructure (ZnO-ZnS core-shell rods) and tube-like architecture were synthesized through a facile chemical solution route successfully. Many tiny ZnS particles were clustered and compacted to form the shell layer of the ZnO-ZnS core-shell rods and the wall of the ZnS tubes during sulfidation of vertically aligned ZnO rods. Structural information revealed that the ZnS shell layer of the ZnO-ZnS core-shell rods and the wall of the tubes were polycrystalline. The sensitivities of ZnO-ZnS core-shell rods and ZnS tubes to reducing and oxidizing gases differed. The ZnO-ZnS core-shell rods were more sensitive to reducing gases, whereas the ZnS tubes were more sensitive to oxidizing gases. The different gas sensing properties of the ZnS-based heterostructures and tubes are further discussed in relation to their microstructures. The heterojunction at the ZnO/ZnS interfacial region resulted in the differing gas sensing properties of the ZnS-based heterostructures and tubes in this study.
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