title: Synthesis of gold nanotriangles and silver nanoparticles using Aloe vera plant extract.
abstract: Biogenic gold nanotriangles and spherical silver nanoparticles were synthesized by a simple procedure using Aloe vera leaf extract as the reducing agent. This procedure offers control over the size of the gold nanotriangle and thereby a handle to tune their optical properties, particularly the position of the longitudinal surface plasmon resonance. The kinetics of gold nanotriangle formation was followed by UV-vis-NIR absorption spectroscopy and transmission electron microscopy (TEM). The effect of reducing agent concentration in the reaction mixture on the yield and size of the gold nanotriangles was studied using transmission electron microscopy. Monitoring the formation of gold nanotriangles as a function of time using TEM reveals that multiply twinned particles (MTPs) play an important role in the formation of gold nanotriangles. It is observed that the slow rate of the reaction along with the shape directing effect of the constituents of the extract are responsible for the formation of single crystalline gold nanotriangles. Reduction of silver ions by Aloe vera extract however, led to the formation of spherical silver nanoparticles of 15.2 nm +/- 4.2 nm size.
authors.affiliation: Nanoscience Group, Materials Chemistry Division, Biochemical Sciences Division, National Chemical Laboratory, Pune 411008, India.
authors.forename: S Prathap
authors.initials: SP
authors.lastname: Chandran
authors.forename: Minakshi
authors.initials: M
authors.lastname: Chaudhary
authors.forename: Renu
authors.initials: R
authors.lastname: Pasricha
authors.forename: Absar
authors.initials: A
authors.lastname: Ahmad
authors.forename: Murali
authors.initials: M
authors.lastname: Sastry
mesh_terms: D000504:Aloe / Q000737:chemistry* / Q000648:ultrastructure; D006046:Gold / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010936:Plant Extracts / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D010936:Plant Extracts; D012834:Silver; D006046:Gold