tailieunhanh - Báo cáo hóa học: " Synthesis of Porous NiO and ZnO Submicro- and Nanofibers from Electrospun Polymer Fiber Templates"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis of Porous NiO and ZnO Submicro- and Nanofibers from Electrospun Polymer Fiber Templates | Nanoscale Res Lett 2009 4 173-177 DOI S11671-008-9221-6 NANO EXPRESS Synthesis of Porous NiO and ZnO Submicro- and Nanofibers from Electrospun Polymer Fiber Templates Yejun Qiu Jie Yu Xiaosong Zhou Cuili Tan Jing Yin Received 17 July 2008 Accepted 11 November 2008 Published online 16 December 2008 to the authors 2008 Abstract Porous nickel oxide NiO and zinc oxide ZnO submicro- and nanofibers were synthesized by impregnating electrospun polyacrylonitrile PAN fiber templates with corresponding metal nitrate aqueous solutions and subsequent calcination. The diameter of the NiO and ZnO fibers was closely related to that of the template fibers and larger diameters were obtained when using the template fibers with larger diameter. SEM results showed that the NiO and ZnO fibers have a large amount of pores with diameters ranging from 5 nm to 20 nm and 50 nm to 100 nm respectively. Energy dispersive X-ray EDX spectra and X-ray diffraction XRD patterns testified that the obtained materials were NiO and ZnO with high purity. Keywords Nickel oxide Zinc oxide Nanofiber Porous material Template Introduction Porous materials with high specific surface area SSA are highly required for applications in catalysis supercapacitors electromechanical actuators and bio- and environmental engineering 1-4 . Nanomaterials in the dimension range of 1 to 100 nm have received considerable interest because of the unique properties different from their bulk counterparts. Porous nanomaterials have attracted much attention in recent years due to their hierarchical nanostructures 5-9 . Y. Qiu J. Yu H X. Zhou C. Tan J. Yin Department of Materials Science and Engineering Shenzhen Graduate School Harbin Institute of Technology Xili Shenzhen 518055 China e-mail jyu@ msejyu@ Nickel oxide NiO is an important material extensively used in catalysis battery cathodes gas sensors electro-chromic films magnetic materials and photovoltaic device 10-15 . Improvement of the SSA of .