Title: Green synthesis, characterizations and power monitoring of AgNPs using red spinach extract

Abstract

It has been synthesized AgNPs using red spinach extract. It is used AgNO3 as a precursor. It has been characterised using UV-Visible and FTIR techbiques. It is shown that the UV-visible spectra of Red spinach extract (blue line), AgNO3 salt solution in DI water (red line) and synthesized AgNPs (green line). Blue line and red line did not appear any particular peak from total 300 to 800 nanometer wavelengths. In the UV-visible spectrum reveals a sharp peak at around 340 nm which is appeared due to the band emission of silver nanoparticles. On the other hand, the green line showed a clear peak from the range of 400 to 500 nanometer wavelength, which in turn affirms the presence of Ag NPs. The maximum absorption is observed with a strong broad peak at around 430 nm due to the transformation of Ag0 from Ag+ which is corresponded to the surface plasmon absorption of AgNPs. Results represents the FTIR spectra of filtered Red spinach extract. The spectra revealed several peaks at around 1018.41 cm-1, 1093.64 cm-1, 1215.15 cm-1, 1263.37 cm-1, 1639.49 cm-1, 2115.91 cm-1, 3363.86 cm-1.The peak at around 1018.41 cm-1 may be associated for the stretching of strong C-F bond of fluoro compound whereas the peak at around 1093.64 cm-1 is appeared due to the stretching of C-O bond of aliphatic ether.The C-O stretching bond of alkyl aryl ether may be responsible for the peak at around 1215.15 cm-1 and 1263.37 cm-1 both. Furthermore, the peak at around 1639.49 cm-1 was appeared due to the stretching vibration of C=C.Another sharp peak at around 2115.91 cm-1 is originated due to the stretching vibrations of C C bond. Moreover, the peak at wave number 3363.86 cm-1 may be appeared due to the O-H and N-H stretching both. The synthesized AgNPs using red spinach have been used for power monitoring using electrochemical cells. A comparative study have been conducted like open circuit voltatge, shortcircuit current,maximum power, internal resistance, power density and the intensiity of light of the LED bulb both with and without AgNPs for an electrochemical cell using red spinach extract. It is shown that after using the AgNPs the open circuit voltage, short circuit current, maximum power,internal resistance, power density has been increased significantly and the internal resistance has been also decreased sinificantly. It is also found that the intensity of the LED bulb has also been increased reasonably after using the AgNPs. This research work may be the guide line for future work.