Orientated Langmuir−Blodgett Assembly of VO2 Nanowires

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• 作者：Liqiang Mai ; Yanhui Gu ; Chunhua Han ; Bin Hu ; Wen Chen ; Pengchao Zhang ; Lin Xu ; Wanli Guo ; Ying Dai
• 刊名：Nano Letters
• 出版年：2009
• 出版时间：February 11, 2009
• 年：2009
• 卷：9
• 期：2
• 页码：826-830
• 全文大小：315K
• 年卷期：v.9,no.2(February 11, 2009)
• ISSN：1530-6992

文摘

We report Langmuir−Blodgett (LB) based assembly of vanadium dioxide (VO₂) nanowires. VO₂ nanowires were functionalized with stearic acid (SA) and cetyltrimethylammonium bromide (CTAB) and then spread on the surface in an aqueous phase in a LB trough. Surface pressure−area (π−A) isotherms were recorded on the LB trough and show hysteretic behavior. Scanning electron microscopy investigations of morphology and alignment of the VO₂ nanowire films transferred at different points on the π−A curve demonstrate that with increasing surface pressure there is a transition from well-separated domains of nanowires to compact and locally ordered nanowire monolayers, while aggregates of raftlike nanowire structures remain after expansion. Interestingly, X-ray diffraction studies show that VO₂ nanowire LB films exhibit (00l) crystal plane orientation, which is attributed to preferential coordination of SA and CTAB−SA complex to (001) surface of VO₂ nanowires thereby driving this orientation.