Survay of LSPR spectra intensity in different methods for silver nanoparticles synthesis

Silver nanoparticles have created a wide range of valuable opportunities for the multiple fields in science, such as analytical chemistry, photonic and in pharmacy. One of the most interesting properties of metal nanoparticles is optical properties that vary according to the size and shape of nanoparticles. The surface plasmon resonance (SPR) is responsible for optical properties in metal nanoparticles [1-2]. Various methods have been used to form silver nanoparticles. These methods include boiling, oven, autoclave, drop wise and ultrasonic methods. Nanoparticles size observed in TEM images show that silver nanoparticles in the drop wise method are larger than those in the ultrasonic method, which completely corresponds with LSPR peak. Under optimal conditions, the experimental detection limit was calculated using the ultrasonic and drop wise methods was respectively 0.01 g/L and 0.008 g/L. Relative standard deviations for real sample in ultrasonic method obtained 1.7 % and in drop wise method obtained 2.0 %. Beer s law is obeyed in the range from 0.02 to 0.1 g/L for ultrasonic and 0.01 to 0.18 g/L for drop wise method. In this research, various methods were used and evaluated for nanoparticle formation. Among these methods, ultrasonic and drop wise methods are the optimal methods, due to better reproducibility and linear range. Linear range in drop wise method is higher than in the ultrasonic method. TEM images were selected to create a more uniform distribution of particles. The size of nanoparticles depends on the position of the peak and maximum wavelength [3].