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Title: Microwave sintering of Ag-nanoparticle thin films on a polyimide substrate

Ag-nanoparticle thin films on a polyimide substrate were subjected to microwave sintering by use of a single-mode waveguide applicator. A two-step sintering process was employed. First, at low conductivities of the film, the film sample was placed at the site of the maximum electric field and subjected to microwave irradiation. Second, when the conductivity of the film increased, the film sample was placed at the site of the maximum magnetic field and again subjected to microwave irradiation. The microwave sintering process was completed within 1.5 min, which is significantly lower than the time required for the oven heating process. The resulting conductivity of the film, albeit only 30% of that of the bulk material, was seven times that of a film annealed at the same temperature in a furnace. Scanning electron microscopy images revealed that the nanoparticles underwent both grain necking and grain growth during microwave sintering. In addition, this sintering process was equivalent to the oven heating process performed at a 50 °C higher annealing temperature. An electromagnetic wave simulation and a heat transfer simulation of the microwave sintering process were performed to gain a thorough understanding of the process.
Authors:
 [1] ;  [2] ; ; ; ;  [1] ;  [3]
  1. Department of Applied Chemistry, Tokyo Institute of Technology, Tokyo 152-8522 (Japan)
  2. (Japan)
  3. Interdisciplinary Cluster for Cutting Edge Research, Center for Energy and Environmental Science, Shinshu University, Ueda, Nagano 386-8567 (Japan)
Publication Date:
OSTI Identifier:
22492250
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 12; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNEALING; ELECTRIC FIELDS; GAIN; GRAIN GROWTH; HEAT TRANSFER; HEATING; IMAGES; IMIDES; IRRADIATION; MAGNETIC FIELDS; NANOPARTICLES; ORGANIC POLYMERS; SCANNING ELECTRON MICROSCOPY; SINTERING; SUBSTRATES; THIN FILMS; WAVEGUIDES