纳米金-染料传感器阵列对汞(Ⅱ)的模式识别

摘要

A combinatorial sensor array consisted of nanogold and dyes has been developed for the pattern recognition of mixed metal ions with visible spectrum detection.Dye-adsorbed nanogold (NG) possesses two specific absorption peaks of nanogold and dye in visible spectral region.The characteristic spectrum is related to the dye structure,pH and metal ion.Through selecting different dyes (Rhodamine B,malachite green and methylene blue) and pH (6.6,7.2,7.8),we fabricated a sensor array with a series of characteristic spectra.The serial characteristic spectra could be changed when the sensor array interacts with Hg2+-M2+ (Pb2+,Cd2+,Mn2+ and Zn2+),generating a corresponded visible spectral pattern.The sensor array was screened by Principal Component Analysis (PCA),the result showed that we could recognize Hg2+ low to 0.20 μ mol/L (1％) in the Hg2+-M2+ mixtures by an optimized sensor array consisted of three sensors (NG-RB,NG-MG,NG-MB in pH 7.8).%采用纳米金、染料组合构成传感器阵列,通过可见光谱检测实现了对金属离子混合体系的模式识别.纳米金表面吸附染料在可见光谱区同时具有纳米金和染料的两个特定吸收峰,该光谱与染料结构、pH值有关,同时受金属离子影响.通过选择不同的染料(罗丹明、孔雀绿、亚甲蓝)和pH值(6.6,7.2和7.8),构建出一系列具有特征光谱的纳米金-染料传感器阵列,此传感器阵列对Hg2+-M2+(pb2+ /Cd2+ /Mn2+ /Zn2+)混合金属离子体系产生相应的可见光谱模式,并通过主成分分析法对该传感器阵列进行了筛选优化.结果表明,采用纳米金-罗丹明/孔雀绿/亚甲蓝在pH 7.8下构成的3个传感器,可实现Hg2+-M2+混合金属离子体系中浓度低至0.2 μmol/L(1％)Hg2+的识别.