High yield preparation of single crystalline Cd metal nanotubes by non-catalytic thermal decomposition route
- 作者：Waheed S. Khan ; Chuanbao Cao ; cbcao@bit.edu.cn ; Faheem K. Butt ; Zulfiqar Ali ; Ghulam Nabi ; Zahid Usman ; Tariq Mahmood ; Sajad Hussain ; M. Tanveer
- 关键词：Metals ; Nanostructures ; Thermal decomposition ; Optical properties
- 刊名：Solid State Sciences
- 出版年：2012
- 期刊代码：98_12932558
- 类别：ch
- 出版时间：June, 2012
- 卷：14
- 期：6
- 页码：693-697
- 文件大小：771 K
摘要
Large scale metallic cadmium (Cd) nanotubes with high purity have been obtained on glass substrate by catalyst-free thermal decomposition of cadmium oxide (CdO) powder at 1200聽掳C for 120聽min using argon (Ar) gas as carrier agent inside an alumina tube mounted in horizontal tube furnace. The structural, compositional and morphological characterizations of cadmium nanotubes (CdNTs) were performed by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). The CdNTs were observed to be single crystalline with 60-70聽nm diameter and tens of micrometre length. Based on vapour-solid (VS) and rolling layer mechanisms, growth process has been proposed for the formation of CdNTs. Room temperature photoluminescence (PL) spectrum for CdNTs recorded under xenon light wavelength of 325聽nm exhibited a very prominent emission band at 383聽nm which may be ascribed to either surface oxidation effects or radiative recombination of electrons in the s, p conduction band near the Fermi surface and the holes in the d bands generated by xenon light excitation. This shows the promise of CdNTs for applications in UV-light emitting devices.