科研之友
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摘要
The analytical performance of three Ag-Au alloy nanoparticles (Ag-AuNPs) based plasmonic sensorsfor the detection of Hg(II) ions were compared. First, Ag-AuNPs were synthesized by the wet chemical method. Then, the nanoparticles were immobilized on a transparent indium tin oxide (ITO) glass surface using poly dimethyl diallyl ammonium chloride (PDDA) as the binding material or by embedding in a polyvinyl alcohol (PVA) film. The optimum composition of the Ag-AuNPs was found to be 0.7 of the Ag content in the alloy. The blue shift of the plasmonic peak wavelength of the Ag-AuNPs could be used for the detection of Hg(II) ions without adding any reagents. The plasmonic sensor based on the Ag-AuNPs/PVA/ITO probe exhibited a much higher sensitive than the Ag-Au colloid or Ag-AuNPs/PDDA/ITO probe. The changes in the peak wavelength were linearly proportional to the logarithm of the Hg(II) ion concentration in the range 0.02-100 ppb, with a detection limit of 0.01 ppb. The proposed sensor was successfully applied to the detection of Hg(II) ions in drinking water, environment, and food samples.
- 出版日期2015-3-1
- 单位苏州大学
