Assembly of Silver Nanoparticles in Pearl-Necklace-Like Nanostructure Using a Polyelectrolyte
Abstract:Pearl-necklace-like Ag nanostructures are prepared with microwave irradiation in a one-step process using polymethacrylic acid (PMAA) as a reducing agent, and AgNO3 as a silver precursor without other chemical agent in a 6.5≤pH≤8.0 aqueous solution. Derjaguin- Landau-Verwey-Overbeek theory is used to calculate the stability of Ag particles in the aqueous medium. The calculated results are fairly consistent with the experimental results. The formation mechanism of pearl-necklace-like silver nanostructures is suggested as three steps: immobilization of Ag+ ions with the PMAA template, reduction of Ag+ ions with PMAA under microwave irradiation, anisotropic self-assembly of silver particles capped by the negatively charged PMAA with electrostatic interactions and Van der Waals forces.
Keywords: (DLVO) theory; Ag+ ions; AgNO3; CO2; COOH; HRTEM; Infra-red (IR) measurement; One-dimensional; PMAA; Polyelectrolyte; Time; UV/Vis spectrum; Van der Waals forces; XRD pattern; crystals; electrostatic interactions; microwave; microwave irradiation; nanostructures; pH; quasi-2D; self-assembly; silver; spaced nanoparticles; spectroscopy; template
Document Type: Research Article
Publication date: 2010-12-01
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