Synthesis and Characterization of Nanocrystalline Silver Coating of Fly Ash Cenosphere Particles by Electroless Process
Electroless nanocrystalline Ag coating of fly ash cenosphere particles utilizing a Sn–Pd catalyst system is demonstrated in this article. The deposition of pure metallic nanocrystalline Ag on the fly ash cenosphere particle surface is confirmed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) analysis. Under the described conditions of electroless coating, average nanocrystalline Ag-coating thickness is observed to be 220 nm, using a focused ion beam technique, which is less than that observed by transmission electron microscopy (TEM) (260–360 nm). TEM observation further reveals that the Ag-coating is made up of 50 nm Ag nanocrystallites, which is comparable with the size of ∼37 nm obtained from the XRD data. The mechanism of the electroless Ag-coating process is discussed. Ag-coated fly ash particles find applications in manufacturing conducting polymers for electromagnetic interference shielding applications.
Keywords: ELECTROLESS COATING; ELECTROMAGNETIC INTERFERENCE SHIELDING; FLY ASH CENOSPHERES; NANOCRYSTALLINE SILVER COATING; X-RAY PHOTOELECTRON SPECTROSCOPY
Document Type: Research Article
Publication date: 01 December 2001
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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