Solution-Liquid-Solid-Induced Tip-Growth of Filled-GaN Nanotubes on MCM-48 Microspheres
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- 作者：Ligang Gai ; Haihui Jiang ; Wanyong Ma ; Deliang Cui ; Ning Lun ; Qilong Wang
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：February 15, 2007
- 年：2007
- 卷：111
- 期：6
- 页码：2386 - 2390
- 全文大小：796K
- 年卷期：v.111,no.6(February 15, 2007)
- ISSN：1932-7455
文摘
Using MCM-48 microspheres (MMS) as the support, GaN nanotubes, with branched tubules and encapsulatedcrystalline GaN nanoparticles, have been prepared by the reaction of GaCl3 with excess NaN3 in dry benzenesolution. The key steps in our approach are as follows: (1) by stirring at low-temperature of 40 
C for 12 h,the starting materials are adsorbed on the MMS surface with the occurrence of in-situ gallium azide precursor;(2) at higher temperature, under the reduction of active sodium atoms (Na*) derived from the decompositionof surplus NaN3, liquid Ga droplets occur acting as catalytic centers for the growth of GaN nanotubes; (3) atthe same time, small GaN nanoparticles, accompanying tube growth, are captured into the tube due to thecapillarity-induced filling. Based on the solution-liquid-solid (SLS) model and hodograph concept, a SLS-induced tip-growth mechanism for the formation of filled-GaN nanotubes on MMS is proposed. The newnanostructures presented here enrich the nanoscale community with structural complexity and enable greaterpotential applications.
C for 12 h,the starting materials are adsorbed on the MMS surface with the occurrence of in-situ gallium azide precursor;(2) at higher temperature, under the reduction of active sodium atoms (Na*) derived from the decompositionof surplus NaN3, liquid Ga droplets occur acting as catalytic centers for the growth of GaN nanotubes; (3) atthe same time, small GaN nanoparticles, accompanying tube growth, are captured into the tube due to thecapillarity-induced filling. Based on the solution-liquid-solid (SLS) model and hodograph concept, a SLS-induced tip-growth mechanism for the formation of filled-GaN nanotubes on MMS is proposed. The newnanostructures presented here enrich the nanoscale community with structural complexity and enable greaterpotential applications.