Effects of Annealing Temperature on Cu-Doped ZnO Nanosheets
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第9期
论文作者：Yuliang Liu Junpeng Wang Chunhua Xu Zishu Si Shensheng Xu Sanqiang Shi
文章页码：860 - 866
摘 要：The synthesis of Cu-doped ZnO nanosheets at room temperature was reported in our previous paper.The effects of annealing temperature on Cu-doped ZnO nanosheets were studied in this paper.Cu-doped ZnO nanosheets were annealed at 200e500 C in air.The annealed specimens were characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）and transmission electron microscopy（TEM）.The results show that Cu concentration in Cu-doped ZnO nanosheets reduced with increasing annealing temperature.When annealing temperature was lower than Zn melting point（410 C）,the morphologies of the Cu-doped ZnO nanosheets remained nearly the same as that before annealing.However,when the annealing temperature was over Zn melting point,Cu-doped ZnO nanosheets changed to nanowires,wormlike nanosheets or did not change.The change of Cu concentration in Cu-doped ZnO nanosheets is explained by oxidation thermodynamics.A physical model is suggested to explain the morphology changes of Cu-doped ZnO nanosheets,based on the existence of Cu-rich layer beneath Cu-doped ZnO nanosheets.
Yuliang Liu1，Junpeng Wang1，Chunhua Xu1，Zishu Si1，Shensheng Xu2，Sanqiang Shi3
1. Collaborative Innovation Center of Nonferrous Metal, School of Materials Science & Engineering,Henan University of Science & Technology2. Department of Electronic and Information Engineering, The Hong Kong Polytechnic University3. Department of Mechanical Engineering, The Hong Kong Polytechnic University
摘 要：The synthesis of Cu-doped ZnO nanosheets at room temperature was reported in our previous paper.The effects of annealing temperature on Cu-doped ZnO nanosheets were studied in this paper.Cu-doped ZnO nanosheets were annealed at 200e500 C in air.The annealed specimens were characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）and transmission electron microscopy（TEM）.The results show that Cu concentration in Cu-doped ZnO nanosheets reduced with increasing annealing temperature.When annealing temperature was lower than Zn melting point（410 C）,the morphologies of the Cu-doped ZnO nanosheets remained nearly the same as that before annealing.However,when the annealing temperature was over Zn melting point,Cu-doped ZnO nanosheets changed to nanowires,wormlike nanosheets or did not change.The change of Cu concentration in Cu-doped ZnO nanosheets is explained by oxidation thermodynamics.A physical model is suggested to explain the morphology changes of Cu-doped ZnO nanosheets,based on the existence of Cu-rich layer beneath Cu-doped ZnO nanosheets.
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