Burns C, Spendel W U, Puckett S, Pacey G E
Miami University Center for Nanotechnology, Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056, USA.
Talanta. 2006 Jun 15;69(4):873-6. doi: 10.1016/j.talanta.2005.11.038. Epub 2006 Jan 4.
Unmodified and modified gold nanoparticles are proposed as sensors using the red to blue transition as an indicator. This work indicates that ionic content is an important variable to track in analytical samples and during the sensor fabrication processes. Mono and multivalent salts where the titrants for a standard gold nanoparticle solution. Multivalent cation salt titrants exhibited a greater sensitivity to color change than monovalent cation salts. The data suggest that specific surface adsorption is the predominant mechanism for the red to blue color change not aggregation. The 3-7nm Debye length for divalent cations versus the 0.5-1.5nm for monovalent cations indicates surface electrodynamic resonance effects are an important factor in the observed color changes.
未修饰和修饰的金纳米颗粒被提议用作传感器，以红到蓝的转变作为指标。这项工作表明，离子含量是分析样品和传感器制造过程中需要追踪的一个重要变量。单价和多价盐是标准金纳米颗粒溶液的滴定剂。多价阳离子盐滴定剂对颜色变化的敏感性比单价阳离子盐更高。数据表明，特定表面吸附是红到蓝颜色变化的主要机制，而非聚集。二价阳离子的德拜长度为3 - 7纳米，而单价阳离子的德拜长度为0.5 - 1.5纳米，这表明表面电动力学共振效应是观察到的颜色变化中的一个重要因素。
