Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904 (Israel) http://chem.ch.huji.ac.il/mandler.
Angew Chem Int Ed Engl. 2014 Jan 3;53(1):294-8. doi: 10.1002/anie.201305962. Epub 2013 Nov 4.
Citrate-stabilized gold nanoparticles 15 nm and 33 nm in diameter were transferred concomitantly with a monolayer of positively charged polyaniline by Langmuir-Blodgett transfer at pH 5 onto a conducting indium-doped tin oxide (ITO) support. Films consisting of one to three layers of polyaniline with thicknesses of 1-3 nm were prepared and characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy. After electro-oxidation of the Au nanoparticles in 0.1 M KCl, cavities were left behind in the film that could be analyzed by SEM. These cavities were able to recapture analyte nanoparticles from a solution of pH 10 and showed size-exclusion properties. The amount of nanoparticles taken up by the cavities was conveniently analyzed by measuring the charge associated with the electro-oxidation of these particles in 0.1 M KCl after the film had been rinsed with water. The size-exclusion properties improved with the number of Langmuir-Blodgett layers transferred.
直径为 15nm 和 33nm 的柠檬酸盐稳定的金纳米粒子通过 Langmuir-Blodgett 转移在 pH5 下与单层带正电荷的聚苯胺共同转移到导电掺铟氧化锡 (ITO) 基底上。通过扫描电子显微镜 (SEM)、原子力显微镜 (AFM) 和 X 射线光电子能谱对厚度为 1-3nm 的一层至三层聚苯胺组成的薄膜进行了制备和表征。在 0.1M KCl 中电氧化 Au 纳米粒子后，在薄膜中留下了可以通过 SEM 分析的空腔。这些空腔能够从 pH10 的溶液中重新捕获分析物纳米粒子，并表现出尺寸排阻特性。通过测量在用水冲洗薄膜后，在 0.1M KCl 中电氧化这些粒子所产生的电荷，方便地分析了空腔中吸收的纳米粒子的量。随着转移的 Langmuir-Blodgett 层数量的增加，尺寸排阻性能得到改善。
