Wang Yuling, Guo Shaojun, Chen Hongjun, Wang Erkang
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 130022, Jilin, PR China.
J Colloid Interface Sci. 2008 Feb 1;318(1):82-7. doi: 10.1016/j.jcis.2007.09.057. Epub 2007 Sep 25.
An effective and facile method for fabrication of large area of aggregated gold nanorods (AuNRs) film was proposed by self-assembly of AuNRs at a toluene/water interface for the first time. It was found that large area of aggregated AuNRs film could be formed at the interface of toluene and water due to the interfacial tension between the two phases. The obtained large area of aggregated AuNRs film exhibits strong surface-enhanced Raman scattering (SERS) activity with 4-aminothiophenol (4-ATP) and 2-aminothiophenol (2-ATP) as the probe molecules based on the strong electromagnetic coupling effect between the very adjacent AuNRs. Enhancement factors (EF) were used to estimate the SERS activity of the aggregated AuNRs film, which is obtained to be 1.7x10(5) for 7a vibration of 4-ATP. SERS intensity is compared with AuNRs deposited directly on glass, indicating high SERS activity and reproducibility of the aggregated AuNRs film. In addition, SERS activity has also been successfully demonstrated for dye molecule (Rhodamin 6G (R6G)) and biological small molecule (adenine) on the aggregated AuNRs film, showing great potential of the aggregated AuNRs film as a convenient and powerful SERS substrate for biological tags and biological molecular detection.
首次提出了一种通过在甲苯/水界面自组装金纳米棒（AuNRs）来制备大面积聚集金纳米棒薄膜的有效且简便的方法。研究发现，由于两相之间的界面张力，在甲苯和水的界面处可形成大面积的聚集金纳米棒薄膜。基于相邻金纳米棒之间强烈的电磁耦合效应，所制备的大面积聚集金纳米棒薄膜以4-氨基硫酚（4-ATP）和2-氨基硫酚（2-ATP）作为探针分子时表现出很强的表面增强拉曼散射（SERS）活性。增强因子（EF）用于评估聚集金纳米棒薄膜的SERS活性，对于4-ATP的7a振动，其增强因子为1.7×10⁵。将SERS强度与直接沉积在玻璃上的金纳米棒进行比较，表明聚集金纳米棒薄膜具有高SERS活性和可重复性。此外，在聚集金纳米棒薄膜上还成功证明了对染料分子（罗丹明6G（R6G））和生物小分子（腺嘌呤）的SERS活性，这表明聚集金纳米棒薄膜作为一种用于生物标记和生物分子检测的便捷且强大的SERS基底具有巨大潜力。
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