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2012 China Functional Materials Technology and Industry Forum

作者： Feng Li Dong-lin Zhao Li-zhong Bai Dong-dong Zhang State Key Laboratory of Chemical Resource Engineering Key Laboratory of Carbon Fiber and Functional PolymersMinistry of EducationBeijing University of Chemical Technology

nano hollow graphene oxide spheres have been successfully fabricated from graphene oxide nanosheets utilizing a water-in-oil emulsion *** quality graphene oxide nanosheets were prepared from natural flake graphite by oxidation and ultrasonic *** oxide nanosheets were supported by the water-in-oil interface,and self-assembled around water droplets under the assistance of *** the removal of aqueous ammonia,the graphene oxide nanosheets stacked and condensed at the water-in-oil interface and finally formed a shell structure around the soft *** nano hollow graphene oxide spheres would be good candidates for catalyst supports,drug delivery and electrode materials in lithium-ion batteries.

关键词： Graphene oxide nanosheets nano hollow spheres Water-in-oil emulsion

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Stepwise synthesis of cuprous oxide nanoparticles with adjustable structures and growth model

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Science China(Technological Sciences) 2014年第11期57卷 2287-2294页

作者： YANG AiLing WANG YuJin LI ShunPin BAO XiChang YANG RenQiang Department of Physics Ocean University of China Qingdao Institute of Bioenergy & Bioprocess Technology Chinese Academy of Sciences

By stepwise adding of reducer N2H4.H2O, cuprous oxide （Cu2O） nanoparticles （NPs） with adjustable structures were synthe- sized. The features of Cu2O NPs were characterized by XRD, TEM and UV-Vis absorption spectra. When the reducer was added into the reactant system at one time, the sizes of the Cu2O NPs are in the range of 120-140 nm. Most Cu2O NPs are sol- id spheres. As the reducer was divided into two equal parts and stepwisely added, almost all the NPs are hollow spheres with good size （150-170 nm） distribution and dispersity. But when the reducer was divided into three or four equal parts and stepwisely added, the NPs are hollow spheres, core-shell structures or solid spheres, and the sizes distribution of the products is deteriorated. The effect of sodium hydrate （NaOH） was also probed. Addition of NaOH speeded up the nucleation and growth processes of Cu2O NPs. With the alkalinity increase, the shells of the hollow spheres become compact and the thicknesses of the shells increase, but the size distribution of the NPs is deteriorated. The absorption spectra of the CuzO NPs are tunable. With the shell thicknesses increase, the absorption peaks have red shifts. An inside-outside growth model of Cu2O NPs was proposed to explain the results. The Cu2O single crystalline grains grow not only in the reactant solution, but also inside of the hollow nanospheres. The new Cu2O nanocrystallines can not only aggregate onto the shells of the nano hollow spheres, but also inside and outside of the hollow spheres, which leads to increasing the shell thicknesses of the hollow spheres, forming core-shell structures or small solid spheres of Cu2O NPs, respectively.

关键词： cuprous oxide nano hollow spheres stepwise synthesis sodium hydrate inside-outside growth model

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