Citation: WANG Jie, ZHUANG Hui-Zhao, XUE Cheng-Shan, LI Jun-Lin, XU Peng. Structure and Formation Mechanism of Sn-Doped ZnO Nanoneedles[J]. Acta Physico-Chimica Sinica, ;2010, 26(10): 2840-2844. doi: 10.3866/PKU.WHXB20101024 shu

Structure and Formation Mechanism of Sn-Doped ZnO Nanoneedles

1.
Institute of Semiconductors, Shandong Normal University, Jinan 250014, P. R. China

Received Date: 27 June 2010
Available Online: 27 September 2010
Fund Project: 国家自然科学基金重大研究项目(90201025, 90301002)资助 (90201025, 90301002)

We synthesized Sn -doped ZnO nanoneedles on Si(111) substrates in two steps: sputtering and thermal oxidation. First, a thin layer of the Sn :Zn films was deposited onto the Si(111) substrates ina JCK -500A radio -frequency magnetron sputtering system. Sn-doped ZnO nanoneedles were then grown by simple thermal oxidation of the as-deposited films at 650 ^oC in Ar atmosphere. The structural, componential, and optical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high -resolution transmission electron microscopy (HRTEM), energy dispersive X-ray (EDX) spectroscopy, and photoluminescence (PL) spectroscopy. The results reveal that the ZnO nanoneedles doped with 2.5%(x, atomic ratio) Sn are single crystalline with a wurtzite hexa nal structure. The lengths of the grown nanoneedles vary between 1 and 3μm. The root diameters of the needles range between 200 and 500 nm while the tips have an average diameter of about 40 nm. Moreover, most of the Sn-doped ZnO nanoneedles are of high crystal quality. Room temperature PL spectroscopy shows a blue-shift from the bulk bandgap emission, which can be attributed toa Sn composition in the nanoneedles as detected by EDX. Based on the reaction conditions, the growth mechanism of the Sn-doped ZnO nanoneedles was also discussed.
- Nanostructure,
- ZnO,
- Sn-doping,
- Sputtering,
- Optical property,
- Formation mechanism
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