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Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (11): 2288.

• Letter • Previous Articles     Next Articles

Sonication-mediated Film Assembly of Gold Nanoparticles at a Water/Hexane Interface Used as a SERS Substrate

MA Juan1, LU Jun-Jun1, LU Ling-Hui1, HU Jia-Wen1*, PAN Jian-Gao1, XU Wei-Qing2   

  1. 1. State Key Laboratory for Chemo/Biosensing and Chemometrics, Biomedical Engineering Center, and College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;
    2. State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China
  • Received:2009-07-15 Online:2009-11-10 Published:2009-11-10
  • Contact: HU Jia-Wen. E-mail: jwhu@hnu.cn
  • Supported by:

    国家自然科学基金(批准号: 20603008, 20873037, J0830415)、湖南省自然科学基金(批准号: 06JJ3006)和超分子结构与材料国家重点实验室(吉林大学)开放基金(批准号: SKLSSM200902)资助.

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Abstract:

We reported sonication-mediated film assembly of gold nanoparticles at a water/hexane interface used as a surface-enhanced Raman scattering(SERS) substrate. Gold colloids/hexane biphasic system was emulsified by sonication, and then the emulsions were left undisturbed to allow natural breaking emulsions. In the end, gold nanoparticle films were formed at the interface. The interfacial nanoparticle films can be easily transferred onto a Cu grid and Si wafer for transmission electron microscopy(TEM) and SERS characterizations, respectively. TEM image shows that the as-formed gold nanoparticle films are of a monolayer structure without notable aggregates. SERS measurements indicate that when the gold nanoparticle films were used as SERS substrates to detect 4-MPY, the detection limit can be reached to 1×10-8 mol/L.

Key words: Surface-enhanced Raman scattering; Sonication; Gold nanoparticle; Self-assembly; Liquid/liquid interface

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