International Journal of Technology and Applied Science

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Structural and Electrical Properties of Mn-Doped ZnO Nanoparticles

Author(s) Akhilesh Prasad Singh
Country India
Abstract Metal oxide nanomaterials combine structural flexibility with electrical, optical, catalytic and electrochemical properties that are strongly influenced by particle size, defects, interfaces and chemical composition. This paper presents a focused account of the synthesis and electrical transport of oxide nanomaterials, bringing together bottom-up wet-chemical routes and top-down mechanical alloying with representative structural and electrical results. Particular attention is given to Mn-doped ZnO nanocrystallites produced by high-energy milling and to the temperature- and frequency-dependent transport response of oxide nanomaterials. The structural discussion is complemented by the supplied high-resolution transmission electron microscopy image, in which lattice fringes are clearly resolved at the nanometre scale. The electrical transport analysis is discussed in terms of localized-state hopping, three-dimensional variable-range hopping, defect-assisted conduction and the dispersive ac response commonly observed in disordered and nanostructured oxides. The overall picture is that reducing the characteristic structural length scale increases the importance of grain boundaries, interfaces and defect states, thereby providing a practical route for tuning charge transport. The article also highlights the need for better control of reproducibility, scale-up and structure–property correlations when laboratory-scale oxide nanomaterials are translated into functional devices.
Keywords metal oxide nanomaterials; nanocrystallites; mechanical alloying; wet-chemical synthesis; electrical transport; variable-range hopping; ac conductivity; ionic conduction
Published In Volume 3, Issue 9, September 2012
Published On 2012-09-05
DOI https://doi.org/10.71097/IJTAS.v3.i9.1414
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Crossref DOI prefix of IJTAS is 10.71097/IJTAS

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