tailieunhanh - Báo cáo hóa học: " Ordered Mesostructured CdS Nanowire Arrays with Rectifying Properties"

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: Ordered Mesostructured CdS Nanowire Arrays with Rectifying Properties | Nanoscale Res Lett 2009 4 414-419 DOI s11671-008-9247-9 NANO EXPRESS Ordered Mesostructured CdS Nanowire Arrays with Rectifying Properties Na Yuan Gang Cheng Yanqing An Zuliang Du Sixin Wu Received 14 November 2008 Accepted 30 December 2008 Published online 6 February 2009 to the authors 2009 Abstract Highly ordered mesoporous CdS nanowire arrays were synthesized by using mesoporous silica as hard template and cadmium xanthate CdR2 as a single precursor. Upon etching silica mesoporous CdS nanowire arrays were produced with a yield as high as 93 wt . The nanowire arrays were characterized by XRD N2 adsorption TEM and SEM. The results show that the CdS products replicated from the mesoporous silica SBA-15 hard template possess highly ordered hexagonal mesostructure and fiber-like morphology analogous to the mother template. The current-voltage characteristics of CdS nanoarrays are strongly nonlinear and asymmetrical showing rectifying diode-like behavior. Keywords Nanomaterials CdS Nanowire arrays SBA-15 Rectification Introduction Efforts in nanomaterials have rapidly expanded into the assembly of well-ordered two- and or three-dimensional 2D and or 3D 3D superstructures provide possibilities to probe brand-new properties and applications due to the spatial orientation and arrangement of the nanocrystals 1-3 . Different methods have been used to fabricate preferentially oriented nanowire arrays such as electrodeposition 4-6 vapor-liquid-solid VLS 7 8 thermal evaporation 9-11 lithography 12 13 AAO 14 15 or mesoporous silica SBA-15 16 -assisted N. Yuan G. Cheng Y. An Z. Du S. Wu El Key Laboratory of Special Functional Materials Henan University Kaifeng 475001 People s Republic of China e-mail wusixin@ methods. In these methods SBA-15 template shows a promising technique in controlling the preferential orientation without changing the nanowire morphology and it has been explored for synthesis of Ag Au Pt Ph and Si nanowires 17 18 .