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本文发展了一种基于离心技术的清洗金纳米八面体表面十六烷基三甲基溴化铵(CTAB)吸附物的有效方法.选择合适的离心转速和离心次数,可以驱除金纳米八面体表面的CTAB分子.通过热失重分析、表面增强拉曼光谱和傅里叶红外光谱表征可以推测,金纳米八面体经合适的离心清洗后,表面残留的少量CTAB分子通过疏水作用由烷基长链与金表面形成(亚)单层吸附,同时,与金表面有强相互作用的溴离子发生脱附.溶剂水对CTAB的稀释在离心清洗金纳米八面体表面的过程中发挥着重要作用.金纳米粒子在离心场中的高速运动导致粒子周围双电层发生极化,极化双电层内产生的局部液流引起双电层内物质交换从而也影响了金纳米八面体表面的清洗效果.金纳米八面体在硫酸溶液和碱性硝酸铅溶液中的电化学研究表明,经过离心清洗的金纳米八面体可以直接应用于单晶电化学研究.
In this paper, we developed an efficient centrifugation-based method for cleaning CTAB adsorbed gold nanoctahedral octahedral surface CTAB molecules.According to TGM, surface-enhanced Raman spectroscopy and Fourier transform infrared spectroscopy, it can be inferred that a small amount of CTAB molecules remaining on the surface of the gold nanoctahedron after being cleaned by appropriate centrifugation can be obtained by hydrophobic interaction of alkyl long chain and The gold surface forms a (sub) monolayer adsorption, and at the same time, the bromide ion which has a strong interaction with the gold surface is desorbed. The dilution of CTAB by solvent water plays an important role in the centrifugal cleaning of the gold octahedron surface. Particles in the centrifugal field of high-speed movement leads to the polarization around the particle electric double layer polarization generated within the electric double layer caused by local flow of material within the electric double layer exchange also affected the gold nano octahedral surface cleaning effect. Electrochemical studies of nano-octahedrons in sulfuric acid solution and alkaline lead nitrate solution show that the gold nanoctahedron after centrifugation can be directly applied to single crystal electrochemical research .