Gold-polymer nanocomposites:: studies of their optical properties and their potential as SERS substrates
Gold-polymer nanocomposites:: studies of their optical properties and their potential as SERS substrates
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DOI：
10.1002/jrs.1418
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发表时间：
2005-12-01
影响因子：
2.5
通讯作者：
Sepaniak, MJ
中科院分区：
文献类型：
--
作者：
Giesfeldt, KS;Connatser, RM;Sepaniak, MJ
聚合物-纳米金属-颗粒复合材料由于其独特的光学和电学特性而显示出技术潜力。在本文中，我们报告了通过将金金属物理气相沉积到柔韧的聚二甲基硅氧烷（PDMS）聚合物上制备的复合材料。 PDMS 相分离表面层中的快速金扩散和纳米金属颗粒形成创造了独特的可调谐亚表面复合材料。可以控制沉积速率和平均金厚度来调整光学特性，并通过可见波长消光光谱法和表面增强拉曼散射（SERS）进行研究。在金沉积过程中进行了直流电导率测量，以研究材料的渗透条件，并通过 X 射线光电子能谱 (XPS) 进行深度分析。这项工作展示了使用 Au-PDMS 纳米复合材料与样品翻译技术 (STT) 相结合来改进 SERS 定性和定量分析。这种转换方法通过最大限度地减少 SERS 固有的热效应和光解效应，显着提高了该技术的再现性和灵敏度。 Au-PDMS 纳米复合材料表现出对生物相关的胺和硝基化合物的亲和力，并表明有可能用作基于生物的 SERS 实验的底物。包括 STT-SERS 条件下纳米复合材料的拉曼光谱样本。版权所有 (c) 2005 John Wiley & Sons, Ltd.
Polymer-nanometallic-particle composites have demonstrated technological potential owing to their unique optical and electrical properties. In this article, we report on composites prepared via physical vapor deposition of gold metal onto pliable polydimethylsiloxane (PDMS) polymer. Rapid Au diffusion and nanometallic-particle formation in a phase-separated surface layer of the PDMS creates unique tunable sub-surface-based composites. The rate of deposition and average Au thickness can be manipulated to tune the optical properties, which are studied by visible wavelength optical extinction spectrometry and surface-enhanced Raman scattering (SERS). DC conductivity measurements were made during Au deposition to study percolation conditions for the materials and depth profiling was performed by X-ray photoelectron spectrometry (XPS). This work presents the use of Au-PDMS nanocomposites in combination with a sample translation technique (STT) for the improved SERS qualitative and quantitative analysis. This translation approach considerably improves the reproducibility and the sensitivity of the technique by minimizing the thermal and photolytic effects inherent in SERS. The Au-PDMS nanocomposites exhibit an affinity for amine and nitro-based compounds that are biologically relevant and point toward the potential for being used as substrates for biologically based SERS experiments. Sample Raman spectra with the nanocomposite under STT-SERS conditions are included. Copyright (c) 2005 John Wiley & Sons, Ltd.