壳聚糖包裹纳米金粒子高灵敏检测汞离子

People have always been concerned about mercury ion trace detection due to it's highly toxic and a wide range of sources.Surface-enhanced Raman scattering was applied as new technology to detect mercury ion with high sensitivity.Raman probe was developed using chitosan as coating material and 4-MBA as Raman reporter：In the mercury ion solution，Chitosan coated gold nanoparticles would be aggregated due to the coordination of chitosan and mercury ions.Then the "hot spot" will form and surface-enhanced Raman scattering effect will appears.Purpose of highly sensitive detection of mercury ions can be achieved by detecting the signal strength of 4-MBA.Although the specificity of this approach is not satisfactory, the sensitivity has reached the requirements.After optimization, the detection range for mercury was 40-200 nM/L and the limit of detection is 40 nM/L.