Giesfeldt Kathleen S, Connatser R Maggie, De Jesús Marco A, Lavrik Nickolay V, Dutta Pampa, Sepaniak Michael J
Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600, USA.
Appl Spectrosc. 2003 Nov;57(11):1346-52. doi: 10.1366/000370203322554491.
Polymer-nano-metallic-particle composites have demonstrated technological potential due to their unique optical and electrical properties. Herein, we report on composites prepared via physical vapor deposition of silver metal onto pliable poly(dimethylsiloxane) (PDMS) polymer. Rapid Ag diffusion and nano-metallic-particle formation in a phase-separated surface layer of the PDMS creates unique sub-surface-based composites whose properties vary based on rate of deposition and average Ag thickness. Additionally, nanometallic-particle spacing can be altered with fair reproducibility and reversibility by physically manipulating the Ag-PDMS composite. The optical properties of the materials are studied by visible wavelength optical extinction spectrometry and surface-enhanced Raman scattering (SERS), including studies performed during physical manipulation. Direct current (DC) conductivity measurements were made during Ag deposition to study percolation conditions for the materials. Depth-profiling was performed by X-ray photoelectron spectrometry. Sample Raman spectral data collected with the composite as a SERS substrate are included. A practical technological characteristic of these composite materials arises from their potential to be molded into functional devices.
聚合物-纳米金属颗粒复合材料因其独特的光学和电学性质而展现出技术潜力。在此，我们报告了通过将银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。在PDMS的相分离表面层中，银的快速扩散和纳米金属颗粒的形成产生了独特的基于亚表面的复合材料，其性质随沉积速率和银的平均厚度而变化。此外，通过对银-聚二甲基硅氧烷复合材料进行物理操作，可以相当可重复且可逆地改变纳米金属颗粒的间距。通过可见波长光学消光光谱法和表面增强拉曼散射（SERS）研究了材料的光学性质，包括在物理操作过程中进行的研究。在银沉积过程中进行直流（DC）电导率测量以研究材料的渗流条件。通过X射线光电子能谱进行深度剖析。还包括以该复合材料作为SERS基底收集的样品拉曼光谱数据。这些复合材料的一个实际技术特性源于它们具有被模塑成功能器件的潜力。
