Journal
JOURNAL OF INORGANIC MATERIALS
Volume 27, Issue 11, Pages 1205-1210Publisher
SCIENCE PRESS
DOI: 10.3724/SP.J.1077.2012.12015
Keywords
high pressure PLD; Zn1-xMgxO; growth mechanism; photoluminescence
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Funding
- National Natural Science Foundation of China [51002065, 11174112]
- Taishan Scholar Foundation of Shandong [TSHW20091007]
- Program for New Century Excellent Talents in University, MOE of China
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The influence of the experimental parameters such as temperature, target, and thickness of catalyst layer on the growth of nanorods were systemically studied by a newly designed and home-built high-pressure pulsed laser deposition Zn1-xMgxO (PLD). The growth mechanism and photoluminescence properties of ZnO and Zn1-xMgxO nanorods were also investigated. It was found that c-orientated ZnO nanorod arrays grown on silicon substrate were obtained when the growth temperature was 925 C and the thickness of gold catalyst layer was 2 nm. It was also proved that growth temperature and catalyst layer thickness were both crucial for the diameter and growth density of ZnO nanorods. A combination of vapor-liquid-solid (VLS) and vapor-solid (VS) mechanism was proposed to describe the growth of ZnO nanorods by high-pressure PLD. Zn1-xMgxO nanorods and nanobelts with random orientation were grown by doping the ZnO target with MgO. The bandgap of ZnO was effectively expanded together with defect-related levels formation in the forbidden gap, which also induced enhancement of visible peak emission.
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