Synthesis, Morphology and Low Electrical Resistance of Silver Nanoparticles/Poly(Vinyl Alcohol) Composites
Date Issued
2010
Date
2010
Author(s)
Lin, Wei-Li
Abstract
Films with the surface silver particle interconnected patterns were fabricated from in situ reduction of silver nitrate in poly(vinyl alcohol) [PVA] aqueous solution under a mild heating at 100 ℃. The initial stage of AgNO3 dissolved in PVA solution was generated the films with fern-like morphology which subsequently directed the generated silver nanoparticles to the film surface and formed the interconnected patterns. The kinetic controls by heating promoted the migration of AgNPs to the surface and the Ag melting during the evaporation and heating. The film thickness and Ag concentration were the parameters that allowed the formation of self-organized Ag patterns on film surfaces. After heating at 100 ℃ for 72 h and annealing at 250 ℃ for 30 min, the size of AgNPs was increased averagely from 60 nm to 300 nm and the AgNPs/PVA surface sheet resistance (Rs) was significantly decreasing from > 2.0×10 8 Ω/sq of pristine PVA film to 2.0×10 0 Ω/sq. The process of forming the silver patterns on film surface was monitored by UV-visible, thermal gravimetric analysis (TGA), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), scanning electron microscope (SEM) and four point probe meter in measuring their silver melting, patterning and conductivity.
Subjects
silver
nanoparticle
in situ
self-assembly
sheet resistance
Type
thesis
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