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Towards sensor applications of a polymer/Ag nanoparticle nanocomposite film

机译：面向聚合物/银纳米颗粒纳米复合膜的传感器应用

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We have demonstrated the capability of a nanocomposite film made of a 2D array of Ag nanoparticles embedded into a poly(glycidyl methacrylate), PGMA, matrix to monitor the presence of organic vapors in the atmosphere. Specifically, changes in the extinction spectra of the submicron nanocomposite film are used to sense the vapors. The transformations of the spectra are fully reversible and reproducible upon multiple exposures. We associate this reversibility and reproducibility with the construction of the nanocomposite film where the cross-linked PGMA network is able to spatially restore its structure upon deswelling. The structure of the extinction spectrum of the film is governed by a collective surface plasmon mode excited in the Ag NPs array. It was found that spectral bands associated with normal and tangential components of the plasmon mode change their width and position when the nanocomposite is exposed to organic vapors. This is due to increasing the spacing between neighboring NPs and a decrease of the refractive index of the polymer caused by swelling of the PGMA matrix. Therefore, the level of spectral transformation is directly related to the level of polymer–solvent thermodynamic affinity where the higher affinity corresponds to the higher level of the swelling. Therefore, we expect that the nanocomposite films (when designed for a particular solvent) can be effectively used as a sensing element in a low-cost volatile organic compounds (VOC) sensor device operating in visual light.
机译：我们已经证明了由嵌入到聚（甲基丙烯酸缩水甘油酯）PGMA基质中的Ag纳米颗粒的二维阵列制成的纳米复合膜监测大气中有机蒸气的存在的能力。具体地，亚微米纳米复合膜的消光光谱的变化用于感测蒸气。光谱的转换是完全可逆的，并且在多次曝光后可重现。我们将这种可逆性和可复制性与纳米复合膜的构造相关联，其中交联的PGMA网络能够在溶胀后在空间上恢复其结构。薄膜的消光光谱结构由在Ag NPs阵列中激发的集体表面等离子体激元模式控制。已经发现，当纳米复合材料暴露于有机蒸气时，与等离激元模式的正态和切向分量相关的光谱带会改变其宽度和位置。这是由于PGMA基质膨胀导致相邻NP之间的间距增加以及聚合物的折射率降低。因此，光谱转换的水平与聚合物-溶剂热力学亲和力的水平直接相关，其中更高的亲和力对应于更高的溶胀水平。因此，我们期望纳米复合膜（当为特定溶剂设计时）可以有效地用作在可见光下运行的低成本挥发性有机化合物（VOC）传感器设备中的传感元件。

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