Solid State Science and Technology, Vol. 15, No 1 (2007) 108-115

ISSN 0128-7389

Corresponding Author: shahromx@yahoo.co.uk

108

TAPERED HEAD FACETS OF ZINC OXIDE NANORODS

Shahrom Mahmud and Mat Johar Abdullah

School of Physics

Universiti Sains Malaysia, 11800 Pulau Pinang

 

ABSTRACT

Tapered head facets of ZnO nanorods are unique morphologies that offer potential

applications in photoconductivity, chemical sensing, UV photodetection and

optoelectronic display. Enhanced photoresponse could be due to large concentrations of

intrinsic structural defects such as oxygen vacancies and zinc interstitials that are

detected from visible PL emission. From our CFCOM gas synthesis technique, we have

grown ZnO nanorods with tapered head facets at a rapid rate of 100nm/s in just 15s

whereby the quenching stage could be crucial in retaining the tapered heads. Unstable

tapered facets such as planes of { 2025 }, {1013 }, {101 4 } and {1015 } could be a

contributing factor in the rapid growth rate of CFCOM ZnO rods due to their faster

growth rates and high surface energies. Simulations of ZnO heads that we report can be

used as a guideline for identification of tapered tips of ZnO nanostructures.

 

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