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Optical concentration of gold nanoparticles as a new concept of analytical sensitivity
, Article Instrumentation Science and Technology ; 2020 ; Shokoufi, N ; Seyed Reihani, S. N ; Sharif University of Technology
Bellwether Publishing, Ltd
2020
Abstract
Concentration procedures have always been implemented when trace analysis of compounds in real matrices is contemplated. A variety of concentration strategies have been reported aiming at decreasing the limits of detection (LODs). The optical concentration of the substance in solution is one of the novel concepts for the enhancement of the analytical sensitivity. In this study, the optical concentration has been measured by the trapping of gold nanoparticles ((Formula presented.) nm) dispersed in water at low-concentrations at the focal volume of the laser beam. The influence of factors such as the time of gold nanoparticle trapping, the size of the nanoparticles, the intensity of the laser...