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https://irlib.pccu.edu.tw/handle/987654321/20866
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| 題名: | Growth and optical properties of uniform tungsten oxide nanowire bundles via a two-step heating process by thermal evaporation |
| 作者: | Hsieh, YT (Hsieh, Yun-Tsung)
Huang, MW (Huang, Meng-Wen)
Chang, CC (Chang, Chen-Chuan)
Chen, US (Chen, Uei-Shin)
Shih, HC (Shih, Han-C.) |
| 貢獻者: | 材料所 |
| 關鍵詞: | THIN-FILMS
PHOTOLUMINESCENCE
DEPOSITION
COATINGS
NANORODS
PVD |
| 日期: | 2010-12 |
| 上傳時間: | 2011-12-08 14:22:57 (UTC+8) |
| 摘要: | Tungsten oxide (WO(3)) nanowires with diameters of 15-40 nm and lengths of hundreds of nanometers were synthesized by thermal chemical vapor deposition (CVD) without using any catalyst in a low-temperature zone (200-300 degrees C) of a tube furnace via a two-step heating process. The morphology, composition, and crystal structure were characterized by scanning electron microscopy (SEM). X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). Raman, ultraviolet UV-visible, and cathodoluminescence (CL) spectroscopy. XRD and TEM confirmed that the nanowires were triclinic WO(3) with growth direction along [001]. Blue emission was observed in both the UV-visible and CL spectrum, indicating that the WO(3) nanowires exhibited a red-shift at an optical absorption wavelength due to oxygen deficiencies. The crystallinity and size distribution of the nanowires influenced the bandgap. In the CL spectrum, the blue emission was at shorter wavelengths than reported previously, which can be attributed to the nanoscale size effect. (C) 2010 Elsevier B.V. All rights reserved. |
| 顯示於類別: | [化學工程與材料工程學系暨碩士班] 期刊論文
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