中文摘要：

纳米颗粒自组装体具有独特的物理化学性质，其自组装技术一直备受关注．在一系列组装技术中，液／气和液／液界面是自组装纳米粒子的理想平台,Yogev等在二氯甲烷／水界面上原位还原自组装了银纳米粒子膜．Zheng等通过在液／液界面的氧化还原反应实现了钯纳米球在界面上的自组装，Li等采用搅拌金溶胶与一种疏水溶剂的两相体系，在液／液界面得到了单层金纳米薄膜．

英文摘要：

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 biphas emulsified by sonication, and then the emulsions were left undisturbed to allow natural breaking ic system was 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 characteriza- tions, 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.