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Title: Enhancement in the structure quality of ZnO nanorods by diluted Co dopants: Analyses via optical second harmonic generation

We report a systematic study about the effect of cobalt concentration in the growth solution over the crystallization, growth, and optical properties of hydrothermally synthesized Zn{sub 1−x}Co{sub x}O [0 ≤ x ≤ 0.40, x is the weight (wt.) % of Co in the growth solution] nanorods. Dilute Co concentration of 1 wt. % in the growth solution enhances the bulk crystal quality of ZnO nanorods, and high wt. % leads to distortion in the ZnO lattice that depresses the crystallization, growth as well as the surface structure quality of ZnO. Although, Co concentration in the growth solution varies from 1 to 40 wt. %, the real doping concentration is limited to 0.28 at. % that is due to the low growth temperature of 80 °C. The enhancement in the crystal quality of ZnO nanorods at dilute Co concentration in the solution is due to the strain relaxation that is significantly higher for ZnO nanorods prepared without, and with high wt. % of Co in the growth solution. Second harmonic generation is used to investigate the net dipole distribution from these coatings, which provides detailed information about bulk and surface structure quality of ZnO nanorods at the same time. High quality ZnO nanorods are fabricated by a low-temperaturemore » (80 °C) hydrothermal synthesis method, and no post synthesis treatment is needed for further crystallization. Therefore, this method is advantageous for the growth of high quality ZnO coatings on plastic substrates that may lead toward its application in flexible electronics.« less
Authors:
;  [1] ;  [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [2]
  1. Institute of Microelectronics and Department of Electrical Engineering, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan (China)
  2. (China)
  3. Department of Physics, National Cheng Kung University, Tainan 701, Taiwan (China)
  4. Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan (China)
  5. Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan (China)
Publication Date:
OSTI Identifier:
22413175
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COATINGS; COBALT; CONCENTRATION RATIO; CRYSTAL GROWTH; CRYSTALLIZATION; CRYSTALS; DOPED MATERIALS; HARMONIC GENERATION; HYDROTHERMAL SYNTHESIS; NANOSTRUCTURES; OPTICAL PROPERTIES; RELAXATION; STRAINS; SUBSTRATES; SURFACES; ZINC OXIDES