In-situ preparation of binary-phase silver nanoparticles at a high Ag+ concentration.
Stable and monodisperse silver nanoparticles (NPs) have been synthesized using high metal salt concentration (up to 0.735 M) through a simple but novel technique. It is based on one-step procedure that uses glycerol for reducing Ag+ in the presence of o-phenylenediamine (o-PDA) resulting the nanoparticles are in two forms (one water-soluble, the other a precipitated). The water-soluble phase contains NPs that have a bimodal size distribution (2-3 and 5-6 nm); the other comprises precipitated NPs, having a unimodal size distribution (2-3 nm). The water-soluble NPs are covalently bonded to the aromatic amine molecules to form isolated units, while the precipitated nanoparticles are embedded in the networks formed by cross-linking between COOH groups of hydroxypyruvic acid (oxidized form of glycerol) and NH2 groups of o-PDA molecules. We used transmission electron microscopy (TEM), UV-Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) to characterize the silver products obtained.
Ullah
Md Habib
MH
Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, Korea.
Kim
Il
I
Ha
Chang-Sik
CS
D003102:Colloids / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D005590:Fractional Precipitation; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D044367:Phase Transition; D012492:Salts / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
D003102:Colloids; D012492:Salts; D012834:Silver