Sains Malaysiana 37(3): 277-280(2008) 

Controlled-Growth of ZnO Nanowires with Different

Processing Temperature

(Pertumbuhan Terkawal Nanodawai ZnO pada Suhu

Pemprosesan yang Berbeza)

Yap Chi Chin & Muhammad Yahaya

School of Applied Physics, Faculty of Science and Technology

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor, Malaysia

Muhamad Mat Salleh & Dee Chang Fu

Institute of Microengineering and Nanotechnology (IMEN)

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor

Malaysia

Received: 12 Jun 2007 / Accepted:18 November 2007 

ABSTRACT

ZnO nanowires have been synthesized using a catalyst-free carbothermal reduction approach on SiO₂-coated Si substrates in a flowing nitrogen atmosphere with a mixture of ZnO and graphite as reactants. The collected ZnO nanowires have been characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and photoluminescence spectroscopy. Controlled growth of the ZnO nanowires was achieved by manipulating the reactants heating temperature from 700 to 1000 ^oC. It was found that the optimum temperature to synthesize high density and long ZnO nanowires was about 800 ⁰C. The possible growth mechanism of ZnO nanowires is also proposed.

Keywords: ZnO; graphite; nanowires; carbothermal; scanning electron microscopy

ABSTRAK

Nanodawai ZnO telah disintesis dengan menggunakan pendekatan penurunan karboterma tanpa mangkin pada substrat Si yang disalut SiO₂ di bawah aliran gas nitrogen dengan campuran ZnO dan grafit sebagai reaktan. Nanodawai ZnO yang terkumpul dicirikan dengan menggunakan belauan sinar-X, mikroskopi imbasan elektron, spektroskopi sebaran tenaga dan spektroskopi fotoluminesen. Pertumbuhan terkawal nanodawai ZnO telah dicapai dengan memanipulasi suhu pemanasan reaktan daripada 700^oC hingga 1000^oC. Didapati suhu yang optimum untuk mensintesis nanodawai ZnO yang berketumpatan tinggi dan panjang adalah pada 800^oC. Selain itu, mekanisme pertumbuhan ZnO juga dicadangkan.

Kata kunci: ZnO; grafit; nanodawai; karboterma; mikroskopi imbasan elektron

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