Kumar E Senthil, Reddy S Ravichandra, Rao M S Ramachandra
Department of Physics, Materials Science Research Centre and Nano Functional Materials Technology Centre, Indian Institute of Technology Madras, Chennai 600036, India.
J Nanosci Nanotechnol. 2009 Sep;9(9):5307-10. doi: 10.1166/jnn.2009.1127.
Novel ZnO hexagonal nanocones have been synthesized on Si(100) substrate by directly evaporating zinc acetate dihydrate, at a low temperature of 400 degrees C, without using any carrier gas and catalyst. Clear formation of hexagonal nanocones was confirmed by high resolution scanning electron microscopy. Size of the hexagonal nanocones was found to be 600 nm. Structural analysis by X-ray diffraction pattern revealed that most of the nanocones were aligned along the c-axis (002). Chemical composition analysis by energy dispersive X-ray spectroscopy shows both zinc and oxygen are nearly equal in stoichiometry. Vapor-liquid-solid (VLS) mechanism was used to explain the growth of ZnO hexagonal nanocones. Diffused reflectance spectroscopy confirms the band gap of ZnO hexagonal nanocones as 3.34 eV. Photoluminescence of the ZnO hexagonal nanocones shows a near band-edge emission at 398 nm. No observable green-yellow emission, which corresponds to oxygen vacancies, was observed.
通过直接蒸发二水合醋酸锌，在400摄氏度的低温下，不使用任何载气和催化剂，在硅（100）衬底上合成了新型氧化锌六角纳米锥。通过高分辨率扫描电子显微镜确认了六角纳米锥的清晰形成。发现六角纳米锥的尺寸为600纳米。X射线衍射图谱的结构分析表明，大多数纳米锥沿c轴（002）排列。能量色散X射线光谱的化学成分分析表明，锌和氧的化学计量比几乎相等。采用气-液-固（VLS）机制来解释氧化锌六角纳米锥的生长。漫反射光谱证实氧化锌六角纳米锥的带隙为3.34电子伏特。氧化锌六角纳米锥的光致发光在398纳米处显示出近带边发射。未观察到对应于氧空位的可观察到的绿黄色发射。
