Nanoparticle Cluster Arrays for High-Performance SERS through Directed Self-Assembly on Flat Substrates and on Optical Fibers
Nanoparticle Cluster Arrays for High-Performance SERS through Directed Self-Assembly on Flat Substrates and on Optical Fibers
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DOI：
10.1021/nn203661n
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发表时间：
2012-03-01
期刊：
影响因子：
17.1
通讯作者：
Krishnamoorthy, Sivashankar
中科院分区：
文献类型：
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作者：
Yap, Fung Ling;Thoniyot, Praveen;Krishnamoorthy, Sivashankar
我们展示了模板引导的金纳米粒子自组装成有序阵列的均匀除尘器，适用于高性能Sers在两个平面簇的形成是由阴离子柠檬酸盐稳定的金纳米粒子的静电自组装驱动的（类似于11.6nm直径）到通过聚苯乙烯-嵌段-聚（2-乙烯基吡啶）的自组装实现的二维有序的模板上。系统的变化被证明为粒子数（N约为5，8，13，或18），每个除尘器，以及集团间的间距（S-c约为37-10 nm）。使用SERS使能的光纤，在平坦芯片上的最小粒子间分离为10（8），并且对于远程感测为>10（7）。在这两种情况下，最佳性能的除尘器阵列是可以实现的，而无需使用任何昂贵的设备或清洁室处理。该方法为低成本和高通量生产传感器芯片或用于遥感应用的3D配置表面铺平了道路。
We demonstrate template-guided self-assembly of gold nanoparticles into ordered arrays of uniform dusters suitable for high-performance SERS on both flat (silicon or glass) chips and an optical fiber faucet Cluster formation is driven by electrostatic self-assembly of anionic citrate-stabilized gold nanoparticles (similar to 11.6 nm diameter) onto two-dimensionally ordered polyelectrolyte templates realized by self-assembly of polystyrene-block-poly(2-vinylpyridine). A systematic variation is demonstrated for the number of particles (N approximate to 5, 8, 13, or 18) per duster as well as intercluster separations (S-c approximate to 37-10 nm). Minimum interparticle separations of 10(8) on flat chips and >10(7) for remote sensing, using SERS-enabled optical fibers is demonstrated. The best performing duster arrays in both cases are achievable without the use of any expensive equipment or dean room processing. The demonstrated approach paves the way to significantly low-cost and high-throughput production of sensor chips or 3D-configured surfaces for remote sensing applications.