Template-Based Synthesis of Hollow Nanotubular ZnO Structures and Nonlinear Electrical Properties under Field-Induced Trap-Assisted Tunneling

Dillip, GR and Banerjee, AN and Joo, SW (2021) Template-Based Synthesis of Hollow Nanotubular ZnO Structures and Nonlinear Electrical Properties under Field-Induced Trap-Assisted Tunneling. In: Journal of Physical Chemistry C, 124 . pp. 28371-28386.

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Abstract

Hollow nanotubular ZnO structures were engineered using graphitic carbon nanofibers (GCNF) as removal templates by a modified coprecipitation method. Two dissimilar morphological ZnO-GCNF hybrids were first synthesized by varying the initial mixing process of the source materials into the precursor solution, followed by being air-annealed (at 600 °C) to oxidize out GCNFs to obtain pristine ZnO nanostructures. The order in which the source materials were mixed had a profound effect on the morphology of the final products. In one case, highly agglomerated hollow nanotubular ZnO structures were obtained, whereas, in another case, highly dispersed ZnO nanoparticulate structures were obtained. The formation mechanism and the related chemistry involved in both of the processes were discussed. The structural, morphological, and compositional analyses revealed the formation of hollow nanotubular highly crystalline ZnO. However, small amounts of unoxidized C atoms within the samples (either at the interparticle interfacial regions and/or intraparticle grain-boundary regions) were also identified, which acted as trap states to manifest field-induced trap-assisted tunneling for nonlinear electrical properties. The analyses of electrical data revealed a trap-charge density from μ1019 to 1020 cm-3 with a trap energy level of μ0.05-0.1 eV. The hollow nanotubular ZnO structure showed a higher trap-charge density and deeper trap level against the nanoparticulate structure, which can be applied in varistors and other multicomponent electronic devices. © 2020 American Chemical Society.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	The copyright of this article belongs to American Chemical Society
Keywords:	Carbon nanofibers; Grain boundaries; Nanocrystalline materials; Oxide minerals; Zinc oxide, Compositional analysis; Grain boundary regions; Graphitic carbon nanofibers; Modified coprecipitation method; Non-linear electrical properties; Precursor solutions; Template-based synthesis; Trap assisted tunneling, II-VI semiconductors
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	29 Jan 2021 11:19
Last Modified:	29 Jan 2021 11:19
URI:	http://eprints.iisc.ac.in/id/eprint/67697

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