tailieunhanh - Báo cáo hóa học: " Characterization and Optical Properties of the Single Crystalline SnS Nanowire Arrays"

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: Characterization and Optical Properties of the Single Crystalline SnS Nanowire Arrays | Nanoscale Res Lett 2009 4 359-363 DOI S11671-009-9253-6 NANO EXPRESS Characterization and Optical Properties of the Single Crystalline SnS Nanowire Arrays G. H. Yue L. S. Wang X. Wang Y. Z. Chen D. L. Peng Received 28 October 2008 Accepted 8 January 2009 Published online 23 January 2009 to the authors 2009 Abstract The SnS nanowire arrays have been successfully synthesized by the template-assisted pulsed electrochemical deposition in the porous anodized aluminum oxide template. The investigation results showed that the as-synthesized nanowires are single crystalline structures and they have a highly preferential orientation. The ordered SnS nanowire arrays are uniform with a diameter of 50 nm and a length up to several tens of micrometers. The synthesized SnS nanowires exhibit strong absorption in visible and near-infrared spectral region and the direct energy gap Eg of SnS nanowires is eV. Keywords SnS nanowires Pulse electrodeposition Optical properties Introduction Semiconductor nanostructures have been attracting worldwide attention due to their exceptional electrical optical and magnetic properties and their potential applications in nanoscale electronics photonics and functional materials as well 1-3 . Among them tin sulfide SnS has sparked intensive interest for its semiconducting and optical G. H. Yue L. S. Wang X. Wang Y. Z. Chen D. L. Peng El Department of Materials Science and Engineering Research Center of Materials Design and Applications Xiamen University Xiamen 361005 People s Republic of China e-mail dlpeng@ G. H. Yue e-mail yuegh@ properties. SnS as one of the important IV-VI group semiconductors exhibits both the p- and n-type conduction 4 has an energy band gap of about eV 5 . Normally SnS is composed of double layers of tightly bound Sn-S atoms and the bonding between layers are extremely weak Van der Vaals forces which has an orthorhombic structure 6 . Additionally SnS has the advantage of its constituent .