Vaporization-Condensation-Recrystallization Process-Mediated Synthesis of Helical m-Aminobenzoic Acid Nanobelts

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• 作者：Seok Min Yoon ; In-Chul Hwang ; Namsoo Shin ; Docheon Ahn ; Sang Joo Lee ; Jin Yong Lee ; Hee Cheul Choi
• 刊名：Langmuir
• 出版年：2007
• 出版时间：November 6, 2007
• 年：2007
• 卷：23
• 期：23
• 页码：11875 - 11882
• 全文大小：1348K
• 年卷期：v.23,no.23(November 6, 2007)
• ISSN：1520-5827

文摘

One-dimensional (1D) helical organic nanostructures were synthesized by a modified vapor-solid (VS) process,called the vaporization-condensation-recrystallization (VCR) process. The conventional solution-phase syntheticmethods generally mediate self-assemblies of repeating unit molecules. To provide enough intermolecular interactionforces among the unit molecules, such strategy requires specific designs and syntheses of complex unit moleculesas they possess numerous functional groups including phenyl rings, hydroxyl groups, long aliphatic chains, etc. Onthe contrary, we found that small and simple organic molecules, for example, m-ABA, could be self-assembled bythe VCR process, resulting in 1D helical organic nanostructures. When m-aminobenzoic acid (m-ABA) powders werevaporized and transported to be condensed on a cooler region, the condensates were recrystallized into 1D helicalnanobelts. Each step of the VCR process was confirmed from control experiments performed by varying reaction times,substrate types, and reaction temperatures. Powder XRD data, SAED analysis, and theoretical calculations revealedthat dimers of m-ABA molecules have repeating units, and the growth axis of m-ABA nanohelices is [100].