Effects of preparing conditions on the nanostructures electrodeposited from the Zn(NO₃)₂ electrolyte containing KCl

详细信息    查看全文

• 作者：Haining Chen ; Liqun Zhu ; Huicong Liu ; Weiping Li ; ^{liweiping@buaa.edu.cn}
• 关键词：Electrodeposition ; Nanostructures ; Zinc nitrate ; Potassium chloride ; Scanning electron microscopy ; X-ray diffraction ; Microstructures
• 刊名：Thin Solid Films
• 出版年：2013
• 出版时间：1 May, 2013
• 年：2013
• 卷：534
• 期：Complete
• 页码：205-213
• 全文大小：2348 K

文摘

In this paper, effects of preparing conditions on the nanostructures electrodeposited from the Zn(NO₃)₂ electrolyte containing KCl were systematically studied. The electrodeposition conditions, such as concentrations of KCl and Zn(NO₃)₂, electrodeposition potential and temperature, had significant influence on the morphology and composition of electrodeposited nanostructures. A typical nanosheet structure composed of ZnO, Zn₅(OH)₈Cl₂¡¤H₂O and Zn was obtained from the electrolyte containing 0.1 M Zn(NO₃)₂ and higher concentration of KCl (¡Ý 0.1 M). In the electrolyte containing 0.1 M KCl, lower concentration of Zn(NO₃)₂ (¡Ü 0.02 M) could induce the electrodeposition of ZnO nanospike structures, while the thick and closely packed nanosheets composed of ZnO and Zn₅(NO₃)₂¡¤(OH)₈¡¤2H₂O were obtained at a higher concentration (0.5 M). Varying the potential from 0.1 to 1.0 V could not obviously change the morphology and composition of nanosheets from the electrolyte containing 0.1 M Zn(NO₃)₂ and 0.1 M KCl, but single and multi-layer nanosheets could be obtained at higher (? 0.1 V) and lower (¡Ü? 0.4 V) potentials, respectively. Nanosheets were electrodeposited at the temperature higher than 45 ¡ãC, and both the thickness and width of nanosheets increased as temperature increased. At a low temperature of 30 ¡ãC, bundles of elongated and entangled nanowires surrounded by a large amount of tiny nanocrystals were deposited, which were mainly composed of ZnO and Zn. After heat treatment at 450 ¡ãC for 30 min, the as-electrodeposited nanosheets were converted to ZnO porous nanosheets due to the decomposition of Zn₅(OH)₈Cl₂¡¤H₂O and oxidation of Zn.