Sains Malaysiana 43(2)(2014): 283–287

Carbon Ion-beam-induced Modification in Structural and Electrical Properties

of ZnO Nanowires

(Alur-ion Karbon Teraruh terhadap Modifikasi Struktur dan Sifat Elektrik Nano Wayar ZnO)

JAVED IQBAL*¹, H. TABASSUM¹, ISHAQ AHMAD², TARIQ JAN¹, C.F. DEE³,

M. MADHUKU⁴A.A. UMAR³& N. AHMAD¹

¹Laboratory of Nanoscience and Technology, Department of Physics

International Islamic University Islamabad, Pakistan

²Experimental Physics Labs, National Center for Physics, Islamabad 44000, Pakistan

³Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor, Malaysia

⁴Themba LABS, Private Bag 11, Wits 2050, Johannesburg, South Africa

Received: 7 January 2013/Accepted: 31 July 2013

ABSTRACT

Zinc oxide nanowires (ZnO NWs) have an efficacious place in nanoworld due to their tremendous properties and applications. In the present work, structural and electrical properties of ZnO NWs have been modified by carbon (C) ions- beam irradiation. With ion-beam energy of 0.8MeV, the physical behaviors of NWs have been studied under different doses from 1×10¹² to 1×10¹⁴ ions/cm². The microstructural and Raman spectroscopy studies showed that the wurtzite crystal structure of the ZnO NWs has been changed into disordered amorphous one under high C ion doses. Whereas, the XRD results showed that Zn nanoparticles are fabricated at high C ion-beam irradiation on ZnO NWs. Scanning electron microscopy (SEM) depicts the formation of cross junctions and parallel junctions between ZnO NWs after C ion irradiation. DC conductivity measurements have confirmed that the conductivity of NWs decreases with increase in C ion doses. It is concluded that the lattice defects significantly contribute to decrease in the conductivity of ZnO NWs.

Keywords: Electrical conductivity; ion-beam irradiation; lattice defects; ZnO nanowires

ABSTRAK

Nano wayar zink oksida (Zn NWs) telah mendapat perhatian di dalam dunia nano kerana sifat dan kegunaannya yang pelbagai. Dalam kajian yang dilakukan, struktur dan sifat elektrik Zn NWs dimodifikasi dengan radiasi alur-ion karbon. Kelakuan fizikal NMs telah dikaji dengan menggunakan tenaga alur-ion sebanyak 0.8 MeV, pada julat 1×10¹² sehingga 1×10¹⁴ ion/cm^2. Kajian mikrostruktur dan spektrum Raman pada dos C yang tinggi menunjukkan struktur hablur wurtzit ZnO telah bertukar kepada amorfus yang tidak tersusun. Manakala keputusan XRD menunjukkan nanozarah Zn, terbentuk di atas Zn NWs apabila dikenakan pancaran alur-ion C yang tinggi. Mikroskop elektron imbasan (SEM) menunjukkan kehadiran simpang silang dan simpang selari antara Zn NWs selepas radiasi ion C. Pengujian kekonduksian DC mengesahkan kekonduksian NMs berkurangan dengan peningkatan dos ion C. Sebagai kesimpulan, kecacatan kekisi yang ketara telah menyebabkan penurunan kekonduksian ZnO NWs.

Kata kunci: Kecacatan kekisi; kekonduksian elektrik; nano wayar Zn; radiasi alur-ion

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*Corresponding author; email: javed.saggu@iiu.edu.pk