Fabrication of SERS based sensor for quantitative detection of arsenic in water
Paper ID : 1420-ICNS
Authors:
Parisa Sadat Noorbakhsh *
Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran
Abstract:
Arsenic is one of the carcinogens contaminations with a low permissible level in water. One of the methods to detect this substance is Raman spectroscopy. Due to the weak Raman spectrum of this material, in this paper, by using reduced silver nanoparticles, produced by a simple and cost-effective method, a substrate for Surface Enhanced Raman Spectroscopy (SERS) has been fabricated for quantitative analysis of arsenic. One way to design SERS substrates is by positioning nearly adjacent metallic nanostructures with nanoscale gaps. Therefore Aggregating AgNPs without any aggregation agents such as electrolytes which may have an adverse effect on the analytes is our purpose, so Ag-NPs were aggregated by two cycles of centrifugation, removing the supernatant and one time of water washing By measuring the intensity of the Raman spectrum and applying an appropriate statistical method, calibration curve for arsenic concentration is obtained. The results show the limit of detection of arsenic concentration up to 50ppb
Keywords:
"Arsenic", "Surface Enhanced Raman Spectroscopy", "Centrifuge", "Raman Spectroscopy", "Reduced Silver Nanoparticles".
Status : Abstract Accepted (Oral Presentation)