Hydrothermal Synthesis and Properties of ZnO Nanorod Arrays

doi:10.11901/1005.3093.2014.434

Chinese Journal of Materials Research

2015, Vol. 29

Issue (7): 529-534 DOI: 10.11901/1005.3093.2014.434

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Hydrothermal Synthesis and Properties of ZnO Nanorod Arrays

Yang TANG(

),Ying ZHAO,Zengguang ZHANG,Jie CHEN

National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, China

Cite this article:

Yang TANG,Ying ZHAO,Zengguang ZHANG,Jie CHEN. Hydrothermal Synthesis and Properties of ZnO Nanorod Arrays. Chinese Journal of Materials Research, 2015, 29(7): 529-534.

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Abstract

ZnO nanorods arrays were synthesized by hydrothermal method from an aqueous solution of Zn(CH₃COO)₂and C₆H₁₂N₄ with additives of NH₄NO₃ and Al(NO₃)₃. The results show that the use of NH₄NO₃in the solution leads to a decrease in nonradiative recombination centers in the ZnO nanorods by lowering their defect density. The reduction of the nonradiative recombination in ZnO nanorods results in a descent in the Stokes shift of the nanorods by 49%. In addition, the optical band gap of the ZnO nanorods could be adjusted in a range of 3.36-3.57 eV by controlling the additives concentration in the solution. The increase of the carrier concentration as a result of the Al doping leads to a blue shift of the optical band gap of the ZnO nanorods to 3.56-3.57 eV, which can be ascribed to the Burstein-Moss effect.

Key words: inorganic non-metallic materials optical band gap hydrothermal method nanorods

Received: 21 August 2014

Fund: *Supported by National Natural Science Foundation of China No.61404007.

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.434 OR https://www.cjmr.org/EN/Y2015/V29/I7/529

Table 1 Solution recipes for fabricating samples 1-9, and the ZnO optical band gap and Stokes shift. <br/>4 mmol/L Zn(CH₃COO)₂ and 4 mmol/L C₆H₁₂N₄are included in all the solution recipes

Fig.1 Transmission spectra of samples 1-9

Fig.2 SEM images of samples 1, 3, 7 and 9

Fig.3 Plots of ((-lnT)*hn)² vs. hn in samples 1-9. The red line is the linear fitting curve

Fig.4 Room temperature photoluminescence spectra of samples 1-9

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