一种基于AAO树枝状银SERS基底的制备及其在气体检测上的应用

Synthesis of AAO Based Ag Dendritic SERS Substrate and Its Application in Vapor Detection

表面增强拉曼散射(SERS)技术因具有高效检测与识别能力而成为一种常用的物质检测手段.本文采用电化学沉积法在阳极氧化铝(AAO)基上制备了树枝状银纳米材料并得到SERS基底,并研究了电化学沉积时间与PVP/AgNO3浓度对树枝状银形貌的影响.结果表明,PVP/AgNO3浓度为0.06M、电化学沉积5min时所获AAO基树枝状银具备最佳的SERS性能.利用此基底组装的便捷式拉曼气体检测装置对甲醛蒸汽、4-DNT蒸汽、二甲苯蒸汽的SERS检测也得到了很好检测信号与较短的响应时间.

Surface enhanced Raman scattering(SERS),as a powerful analytical technique,has attracted considerable attention due to its ultrahigh sensitivity and nondestructive characteristics.Here,a novel SERS substrate based on anodic aluminum oxide(AAO)membrane has been developed via electrodeposition.The effect of concentration,deposition time on Ag dendritic nanostructures was studied.The experimental results show that the Ag-dendrites prepared in AgNO3/PVP aqueous system with concentration of0.06 Mexhibit the extraordinary SERS performance,wherein the deposition voltage and electrolysis time were-0.75 Vand 5 min,respectively.The prepared AAO-based Ag dendritic as an effective SERS substrate was applied in the sensitive vapor detection of formaldehyde,2,4-dinitrotoluene and xylene.