Detection of TNT by a molecularly imprinted polymer film-based surface plasmon resonance sensor

• 来源期刊: 科学通报(英文版)
• 学科: 工学
• 年，卷（期）: 2012,（17）
• 页码范围: 2102-2105
• 页数: 4页
• 分类号: TQ560.7|TP212.2
• 语种: 中文

摘要

A surface plasmon resonance(SPR) sensor using a molecularly imprinted polymer(MIP) film as a recognition element for detection of 2,4,6-trinitrotoluene(TNT) was developed.The TNT-imprinted polymer film was prepared by thermo initiated polymerization on the bare Au surface of an SPR sensor chip.Template TNT molecules were quickly removed with an organic solution of acetonitrile/acetic acid(9:1,v/v),causing a shift of 0.7° in SPR angle.The limit of detection for TNT was demonstrated to be as low as 1*10-8 mol/L.In the concentration range of 1*10-8-1*10-5 mol/L,the change of SPR angle was linear with the negative logarithm of TNT concentration,Selectivity studies showed that the SPR sensor had no response to TNT analogues 2,4,5-trinitrotoluene and 1,3,5-trinitrohexahydro-1,3,5-triazine at a concentration of 1*10-4 mol/L.The results suggest that the SPR sensor combined with a MIP film has the advantages of high sensitivity and selectivity,and long-term stability toward the analyte TNT.