title: Synthesis of uniform gold nanoparticles using non-pathogenic bio-control agent: evolution of morphology from nano-spheres to triangular nanoprisms.
abstract: Green synthesis of gold nanospheres with uniform diameter and triangular nanoprisms with optically flat surface was carried out using a non-pathogenic bio-control agent Trichoderma asperellum for reduction of HAuCl(4). Kinetics of the reaction was monitored by UV-Vis absorption spectroscopy. No additional capping/complexing agent was used for stabilizing the gold nanoparticles. Evolution of morphology from pseudospherical nanoparticles to triangular nanoprisms was studied by transmission electron microscopy (TEM). It revealed that three or more pseudospheres fused to form nanoprisms of different shapes and sizes. Slow rate of reduction of HAuCl(4) by constituents of cell-free fungal extract was instrumental in producing such exotic morphologies. Isolation of gold nanotriangles from the reacting masses was achieved by differential centrifugation.
authors: NABT Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors: P
authors: P
authors: Mukherjee
authors: Mainak
authors: M
authors: Roy
authors: B P
authors: BP
authors: Mandal
authors: Sipra
authors: S
authors: Choudhury
authors: R
authors: R
authors: Tewari
authors: A K
authors: AK
authors: Tyagi
authors: S P
authors: SP
authors: Kale
mesh_terms: D006046:Gold / Q000737:chemistry*; D055772:Green Chemistry Technology / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010084:Oxidation-Reduction; D014242:Trichoderma / Q000737:chemistry*
chemical_list: D006046:Gold