tailieunhanh - Báo cáo hóa học: " Self-Assembled 3D Flower-Like Hierarchical b-Ni(OH)2 Hollow Architectures and their In Situ Thermal "

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: Self-Assembled 3D Flower-Like Hierarchical b-Ni(OH)2 Hollow Architectures and their In Situ Thermal | Nanoscale Res Lett 2009 4 550-557 DOI S11671-009-9279-9 NANO EXPRESS Self-Assembled 3D Flower-Like Hierarchical -Ni OH 2 Hollow Architectures and their In Situ Thermal Conversion to NiO Lu-Ping Zhu Gui-Hong Liao Yang Yang Hong-Mei Xiao Ji-Fen Wang Shao-Yun Fu Received 16 January 2009 Accepted 11 February 2009 Published online 27 February 2009 to the authors 2009 Abstract Three-dimensional 3D flower-like hierarchical b-Ni OH 2 hollow architectures were synthesized by a facile hydrothermal route. The as-obtained products were well characterized by XRD SEM TEM HrTeM SAED and DSC-TGA. It was shown that the 3D flower-like hierarchical b-Ni OH 2 hollow architectures with a diameter of several micrometers are assembled from nanosheets with a thickness of 10-20 nm and a width of m. A rational mechanism of formation was proposed on the basis of a range of contrasting experiments. 3D flower-like hierarchical NiO hollow architectures with porous structure were obtained after thermal decomposition at appropriate temperatures. UV-Vis spectra reveal that the band gap of the as-synthesized NiO samples was about eV exhibiting obviously red shift compared with the bulk counterpart. Keywords Ni OH 2 NiO Hollow architecture Hydrothermal synthesis . Zhu H . Wang School of Urban Development and Environmental Engineering Shanghai Second Polytechnic University Shanghai 201209 China e-mail lpzhu@ lpzhu@ . Zhu . Liao Y. Yang . Xiao . Fu Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China . Fu e-mail syfu@ Introduction Ordered self-assembly of nanoscale building blocks such as nanoparticles nanorods nanoribbons and so forth into complex architectures has recently become a hot topic in material research fields. Remarkable progress has been made in the self-assembly of highly organized building blocks of metals 1-4 semiconductors 5-8 copolymers 9 and .