ZnO multipods, submicron wires, and spherical structures and their unique field emission behavior

TitleZnO multipods, submicron wires, and spherical structures and their unique field emission behavior
Publication TypeJournal Article
Year of Publication2006
AuthorsRamgir, NS, Late, DJ, Bhise, AB, More, MA, Mulla, IS, Joag, DS, Vijayamohanan, K
JournalJournal of Physical Chemistry B
Volume110
Issue37
Pagination18236-18242
Date PublishedSEP
Type of ArticleArticle
ISSN1520-6106
Abstract

A simple method of vapor deposition for the shape selective synthesis of ZnO structures, namely, multipods, submicron wires, and spheres, has been successfully demonstrated. A plausible growth mechanism based on the studies of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) is proposed. Our studies suggest that the growth of a multipod structure is governed by the screw dislocation propagation while the vapor-liquid-solid (VLS) mechanism is responsible for the formation of submicron wires and spheres. Moreover, the flow rate of the carrier gas plays a crucial role in governing the morphology. Further, these structures exhibit an enhanced field emission behavior. The nonlinearity in the Fowler-Nordheim (F-N) plot, a characteristic feature of electron emission from semiconductors, is explained by considering the contributions from both the conduction and the valence bands of ZnO.

DOI10.1021/jp0628131
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

3.187

Divison category: 
Physical and Materials Chemistry