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Title: In situ application of polyelectrolytes in zinc oxide nanorod synthesis: Understanding the effects on the structural and optical characteristics
Authors: Suresh, V.
Jayaraman, S.
Muhamad Jailani, M.I.B.
Srinivasan, M.P. 
Keywords: Feature tunability
Hydrothermal synthesis
In situ size tailoring
PL emission map
Surface effects
ZnO nanorods
Issue Date: 15-Mar-2013
Citation: Suresh, V., Jayaraman, S., Muhamad Jailani, M.I.B., Srinivasan, M.P. (2013-03-15). In situ application of polyelectrolytes in zinc oxide nanorod synthesis: Understanding the effects on the structural and optical characteristics. Journal of Colloid and Interface Science 394 (1) : 13-19. ScholarBank@NUS Repository.
Abstract: We report a facile and simple means of synthesizing a macroscopic array of ZnO nanorods with high feature densities using a modified hydrothermal approach that involves the in situ introduction of polyelectrolyte. The ZnO nanorod arrays with heights of 1.5 μm and diameters of 350. nm were consistently reproducible and were bestowed with the advantage of in situ process tunability offered by employing polyethylenimine (PEI) as a surface modifying agent. The fabrication combines benefits from the hydrothermal approach in terms of process simplicity and flexibility and from the use polyelectrolyte that offers a better nanorod surface, quenched defect levels and enhancement of the UV band edge emission. Structural and elemental analysis of the PEI-modified and unmodified nanorods emphasize the fact that the intentional introduction of PEI results in a nanorod with better surface quality as evidenced by photoluminescence (PL) spectra. The tunability of the feature dimensions of the nanorods and an analysis of the bulk and surface (surface defect) responses to the PL point to significant promise of high density orthogonal nanorods in a number of optoelectronic applications. While the defects in the ZnO nanorods can point towards the application of ZnO nanorods in charge trap flash memory devices, highly crystalline, size tunable, high aspect ratio nanorods find applications as building components in solid state lighting. © 2012 Elsevier Inc.
Source Title: Journal of Colloid and Interface Science
ISSN: 00219797
DOI: 10.1016/j.jcis.2012.11.027
Appears in Collections:Staff Publications

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