One-pot Preparation of Cu2(OH)3NO3 Nanosheets and Cu(OH)2 Nanowires

Author(s): Wenzhe Zhang, Ailing Yang*, Xichang Bao.

Journal Name: Nanoscience & Nanotechnology-Asia

Volume 9 , Issue 4 , 2019

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Graphical Abstract:


Abstract:

Introduction: By using Cu(NO3)2 as precursor and polyvinylpyrrolidone (PVP) as surfactant, nanosheets of Cu2(OH)3NO3, nanowires of Cu(OH)2 or the mixture of the two were prepared under different molar ratios of OH− to Cu2+.

Materials and Methods: The crystal structures and morphologies of the products were characterized by X-Ray Diffraction (XRD) and Transmission Electron Microscope (TEM).

Results: When the molar ratio of OH− to Cu2+ in reaction solution is lower than 1.28, pure Cu2(OH)3NO3 nanosheets were obtained. The thickness of one piece of nanosheet is about 167 nm. The Cu2(OH)3NO3 nanosheets consists of two types of crystal structures, monoclinic phase and orthorhombic phase. With increase of the molar ratio of OH− to Cu2+, the monoclinic phase of Cu2(OH)3NO3 was transferred to the orthorhombic phase of Cu2(OH)3NO3. When the molar ratio of OH− to Cu2+ is within 1.28-2.24, the product is the mixture of Cu2(OH)3NO3 nanosheets and Cu(OH)2 nanowires. And when this molar ratio is higher than 2.24, only Cu(OH)2 nanowires were produced. The lengths and the diameters of the Cu(OH)2 nanowires are in the region of 50-250 nm and 10 nm, respectively.

Conclusion: The reason of the Cu2(OH)3NO3 nanosheets changing into the Cu(OH)2 nanowires is that the OH− anions replace the NO3 − anions in the layered Cu2(OH)3NO3 nanosheets, which causes the rupture of hydrogen bonds connecting the adjacent layers. The Cu(OH)2 nanowires were not stable and found to become spindled CuO nanosheets in air at room temperature.

Keywords: Cu2(OH)3NO3 nanosheets, Cu(OH)2 nanowires, molar ratio of OH− to Cu2+, monoclinic phase, orthorhombic phase, anion replacement, spindled CuO nanosheets.

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Article Details

VOLUME: 9
ISSUE: 4
Year: 2019
Page: [467 - 471]
Pages: 5
DOI: 10.2174/2210681208666180601102915
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