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Preparation of Cu2O Hollow Nanospheres by Refluxing Method

Author: YangMuQuan
Tutor: PangGuangSheng
School: Jilin University
Course: Inorganic Chemistry
Keywords: Nano-materials Cuprous oxide Hollow ball
CLC: O614.121
Type: Master's thesis
Year: 2007
Downloads: 288
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Abstract


In recent years, controlled architecture and fabrication of hollow inorganic micro- and nano-structure have attracted extensive research interest owing to their unique thermal, electrical, optical and surface properties. The materials with hollow interior have potential applications as catalyst, adsorbent, drug delivery, photonic crystals, optical imaging, low dielectric constant materials, and acoustic insulation etc. Cuprous oxide is an important p-type semiconductor with a direct band gap of 2.17 eV. Owing to its unique optical properties, Cu2O has potential applications in catalytic oxidation of CO to CO2, photocatalytic degradation of organic pollutants and decomposition of water into H2 and O2 under visible light.Various methods have been reported for preparing Cu2O with various morphologies and hollow structures, such as nanowire, octahedral nanocages, hollow cube and spheres. There have been two main categories of preparation routes concerning the synthesis of hollow structure: The template method is used by adsorption of raw materials or target precursors on the template surface and subsequent removal of the template by calcination or dissolution with solvent; Another preparation strategy concerns the physical phenomena such as“Ostwald ripening”and“Kirkendall effect”. CTAB and Gelatin are used in preparing Cu2O hollow nanospheres by template-assisted method. Hollow Cu2O nanospheres are prepared at 150-180°C via a reductive transformation of Cu2O and Ostwald ripening process. Here, we describe a facile route in the formation of hollow Cu2O nanospheres by refluxing Cu（OAc）2·H2O in isopropanol with hydrazine as reductant.Cuprous oxide hollow nanospheres have been prepared by refluxing copper acetate in isopropanol with hydrazine as reductant. There is no surfactant or template in the reaction system. The products are characterized by X-ray diffraction, UV-visible diffuse reflectance spectroscopy, SEM and TEM. The results indicate that the Cu2O hollow nanospheres are aggregated by smaller nanoparticles with an average size ca. 6.6 nm. UV-visible diffuse reflectance spectrum indicates the hollow Cu2O nanospheres have red shift comparing with solid counterpart. The influence of the reaction conditions on the formation of nanospheres as well as morphology are studied, such as, reaction temperature, reaction time and addition of water.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Part Ⅰ family metal elements and their compounds > The copper Vice family (IB group metal elements ) > Copper Cu
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