In Situ Fabricated Cu-Ag Nanoparticle-Embedded Polymer Thin Film as an Efficient Broad Spectrum SERS Substrate
In Situ Fabricated Cu-Ag Nanoparticle-Embedded Polymer Thin Film as an Efficient Broad Spectrum SERS Substrate
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DOI：
10.1021/acs.jpcc.6b10238
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发表时间：
2017-01-19
影响因子：
3.7
通讯作者：
Radhakrishnan, T. P.
中科院分区：
文献类型：
--
作者：
Rao, V. Kesava;Ghildiyal, Pankaj;Radhakrishnan, T. P.
聚合物金属纳米复合材料的薄膜可以用作有效的表面增强拉曼散射（Sers）基底;如果它可以通过具有成本效益和简便的方案制造，并且可以针对一系列激发波长实现高增强因子（EF），则将是非常有利的，从而能够灵敏地检测不同的分析物。聚（乙烯醇）（PVA）薄膜与嵌入Cu-Ag纳米粒子通过一个简单的原位程序，通过逐步形成的CuO-PVA和Cu-PVA的制造通过不同的阶段，通过光谱，显微镜，电子衍射和元素分析监测的制造。Cu-Ag组合的选择取决于其广泛的等离子体消光，有利的成本因素和纳米复合材料的化学稳定性; PVA的水凝胶特性促进分析物吸收和与纳米颗粒接触，从而产生有效Sers。具有最佳组成的Cu-Ag-PVA薄膜显示出在可见光范围的相当大的部分上显示等离子体消光，并且在三种不同的激发波长下对分析物罗丹明6 G和亚甲蓝提供10（7）-10（8）量级的EF; EF值显著高于先前报道的那些，其中大多数基于Cu-Ag的Sers基底。这种新型的聚合物-纳米复合物薄膜是一种有效的Sers基底，提供了亚皮摩尔的检测极限。
Thin films of polymer metal nanocomposites can serve as efficient surface-enhanced Raman scattering (SERS) substrates; it would be highly advantageous if it can be fabricated by a cost-effective and facile protocol, and high enhancement factors (EF) can be realized for a range of excitation wavelengths, enabling sensitive detection of different analytes. Poly(vinyl alcohol) (PVA) thin films with embedded Cu-Ag nanoparticles are fabricated through a simple in situ procedure via stepwise formation of CuO-PVA and Cu-PVA; the fabrication is monitored through the different stages, by spectroscopy, microscopy, electron diffraction, and elemental analysis. Choice of the Cu-Ag combination is dictated by its broad plasmonic extinction, favorable cost factor, and chemical stability of the nanocomposite; the hydrogel character of PVA facilitates analyte absorption and contact with the nanoparticles, leading to efficient SERS. Cu-Ag-PVA thin film with an optimal composition is shown to display plasmonic extinction over an appreciable part of the visible range and to provide EF of the order of 10(7)-10(8) for the analytes, rhodamine 6G and methylene blue, at three different excitation wavelengths; the EF values are significantly higher than those reported earlier, with most of the Cu-Ag based SERS substrates. The novel polymer-bimetal nairocomposite thin film is an efficient SERS substrate providing subpicomolar limits of detection.