Fabrication and characterization of CdS-nanoparticle mono- and multilayers on a self-assembled monolayer of alkanedithiols on gold
Fabrication and characterization of CdS-nanoparticle mono- and multilayers on a self-assembled monolayer of alkanedithiols on gold
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DOI：
10.1021/jp973046w
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发表时间：
1998-02-26
影响因子：
3.3
通讯作者：
Uosaki, K
中科院分区：
文献类型：
--
作者：
Nakanishi, T;Ohtani, B;Uosaki, K
在包覆有烷基二硫醇自组装单分子膜(SAM)的金衬底上，通过交替地浸泡在二硫醇的乙醇溶液中(即1，6-己二硫醇或1，10-十碳二硫醇)和分散(直径约3 nm)的Cd S纳米粒子，在包覆有烷基二硫醇自组装单分子膜(SAM)的金衬底上制备了单层和多层Cd S纳米粒子，后者是在双(2-乙基己基)琥珀酸磺酸钠(气溶胶OT，AOT)/H2O/正庚烷反胶束中制备的。用傅里叶变换红外反射吸收光谱(FT-IRRAS)和X射线光电子能谱(XPS)证实了二硫醇自组装膜(SAM)和硫化镉(CDS)在复合膜制备过程中的层层结构。结果表明，自组装膜表面的硫化镉纳米粒子被AOT包围，然后用二硫醇溶液处理后被二硫醇取代。用电感耦合等离子体质谱(ICP-MS)测定了样品中纳米硫化镉的含量，结果与上述单层结构一致。当复合膜浸泡在以三乙醇胺为电子给体的电解液中时，观察到了光致阳极电流。与分散的硫化镉的吸收光谱非常相似的作用光谱表明，纳米硫化镉颗粒即使固定在衬底上也保持其尺寸不变，没有相互聚集，并具有半导体性质。
Mono- and multilayers of cadmium sulfide (CdS) nanoparticles were fabricated on a gold substrate covered with alkanedithiol self-assembled monolayers (SAMs) by an alternate immersion of the substrate into ethanolic solutions of dithiol, i.e., 1,6-hexanedithiol or 1,10-decanedithiol, and dispersion of CdS nanoparticles (ca. 3 nm in diameter), the latter of which was prepared in sodium bis(2-ethylhexyl)sulfosuccinate (Aerosol OT, AOT)/H2O/heptane reversed micelles. A layer-by-layer structure of dithiol SAM and CdS monolayer was confirmed with Fourier transform infrared reflection-absorption spectroscopy (FT-IRRAS) and X-ray photoelectron spectroscopy (XPS) at each step of composite-film preparation. It was revealed that CdS nanoparticles on SAMs were surrounded by AOT, which was then substituted by dithiols when the film was treated with the dithiol solution. The amount of CdS nanoparticles on the sample was measured by inductively coupled plasma mass spectrometry (ICP-MS) to be consistent with the above-mentioned monolayer structure. The photoinduced anodic current was observed when the composite film was immersed in an electrolyte solution containing triethanolamine as an electron donor. An action spectrum, which was quite similar to the absorption spectrum of CdS dispersion, indicates that the CdS nanoparticle keeps its size without mutual aggregation, and semiconducting properties even after being immobilized on the substrate.