Formation of Positively Charged Copper Hydroxide Nanostrands and Their Structural Characterization

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• 作者：Yan-Hong Luo ; Jianguo Huang ; Jian Jin ; Xinsheng Peng ; Wolfgang Schmitt ; and Izumi Ichinose
• 刊名：Chemistry of Materials
• 出版年：2006
• 出版时间：April 4, 2006
• 年：2006
• 卷：18
• 期：7
• 页码：1795 - 1802
• 全文大小：1187K
• 年卷期：v.18,no.7(April 4, 2006)
• ISSN：1520-5002

文摘

Extremely narrow copper hydroxide nanostrands with a diameter of 2.5 nm were prepared by controllingthe pH of an aqueous copper nitrate solution with weak bases. The nanostrands grew slowly from initiallyformed small particles of 2-6 nm. The growth was highly sensitive to the amount and types of weakbases. Long nanostrands were obtained in a range of pH 6.0-6.2 at a concentration of approximate 2mM copper nitrate. The length reached several tens of micrometers after an aging time of a few days,giving an aspect ratio more than tens of thousands. Their structures were characterized by scanningelectron microscopy, transmission electron microscopy (TEM), and electron diffraction. This nanostrandis composed of positively charged linear clusters, [Cu₈(OH)₁₄(H₂O)₄]²⁺, as judged from the results ofhigh-resolution TEM, UV-vis titration experiments, and crystallographic considerations. We widelyinvestigated the nanomorphologies of copper hydroxide and related compounds by changing the syntheticconditions and then proposed a unique growth mechanism for the nanostrands of orthorhombic copperhydroxide.