Biosynthesis of gold nanoparticles using cold and hot water extract of pedalium murex Linn leaf. Prepared gold nanoparticle were analysed by UV-visible spectroscopy, cyclic voltammetric, XRD, SEM and TEM. UV studies shows well-built surface plasmon resonance absorption peak at 540 nm. The band gap energy of 2.95 eV and 2.90 eV achieved for gold nanoparticles prepared by cold and hot water extract respectively. The cyclic voltammetric behaviour of both types of nanoparticles was studied at different pHs. The XRD spectra for deposited thin film samples confirm the crystalline nature and highly stable gold nanoparticles. SEM image shows the nanoparticles are semi-spherical and their sizes are controlled within the range of 180 nm to 200 nm. Hexagonal, triangular, and spherical nanoparticles could be seen in the transmission electron micrographs for both types of particles. The selected-area electron diffraction patterns reveal that the sample is semi crystalline (002) and (111) phase.
Keywords: Biosynthesis; Gold nanoparticles; Pedalium murex Linn; XRD