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Localized Surface Plasmon Resonance Gas Sensor Of Au Nano-islands Coated With Molecularly Imprinted Polymer: Influence Of Polymer Thickness On Sensitivity And Selectivity
Bin Chen, Chuanjun Liu, Lingpu Ge, K. Hayashi
Published 2016 · Materials Science
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Abstract α-Pinene is a kind of biomarker vapors emitted by plant during metabolism process. In this work, A localized surface plasmon resonance (LSPR) sensors based on the large and closely-packed Au nano-islands were propose to be coupled with the molecularly imprinted polymer (MIP) film for α-pinene vapor detection. Au nano-island film was prepared through repeated Au sputtering and annealing with cycles as many as 18. MIPα-pinene was prepared using methacylic acid as monomer, ethylene glycol dimethylacrylate as cross-linker, and α-pinene as the template molecule. Pre-polymerized MIPα-pinene solution was spin-coated on Au nano-island films at a series of speeds. The influence of spin coating speed on polymer thickness and target vapor binding capability was investigated. The result demonstrated that thick polymer layer could bind more template molecules than the thin one, which verified our speculation that there were more specific template binding sites in thick polymer layer. In addition, the in-situ response of MIPα-pinene coated Au nano-island film to α-pinene vapor was verified to be rapid (in less than 10 s) and reversible. The selective α-pinene vapor adsorption and absorption characteristics of MIPα-pinene coated Au nano-islands film to α-pinene vapor was observed comparing with the responses to γ-terpinene and limonene vapors.
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