Author:
Wang Chih-Chiang,Chang Yu-Sung,Lin Pao-Tai,Shieu Fuh-Sheng,Shih Han-Chang
Abstract
AbstractAu-decorated Bi2Se3 nanoplatelet heterostructures are fabricated by a two-step process of thermal CVD at 600 °C and magnetron sputtering at room-temperature. The crystal structures and binding energies of rhombohedral Bi2Se3 and FCC Au are determined by XRD, HRTEM, XPS, and Raman spectroscopy. XPS and Raman spectroscopy reveal the interaction between Au and Bi2Se3 by shifting in the binding energies of Au–Au, Au–Se and Bi–Se bonds and the wavenumber of A1g2 and Eg2 modes. Au-decorated Bi2Se3 nanoplatelet heterostructures are observed using FESEM, and confirmed by XPS, Raman spectroscopy, and HRTEM imaging. Their optical band gap of the Au-decorated Bi2Se3 nanoplatelet heterostructures increases with Au thickness about 1.92-fold as much as that of pristine Bi2Se3 (0.39 eV), owing to the Burstein-Moss effect. The optical absorptance of the Au-decorated Bi2Se3 nanoplatelet heterostructures revealed increment with wavelength from 200 to 500 nm and decrement with increasing wavelength from 500 to 800 nm.
Funder
Ministry of Science and Technology, Taiwan
Publisher
Springer Science and Business Media LLC
Reference69 articles.
1. Kalele, S., Gosavi, S. W., Urban, J. & Kulkarni, S. K. Nanoshell particles: synthesis, properties and applications. Curr. Sci. 91, 1038–1052 (2006).
2. Kim, S., Fisher, B., Eisler, H. J. & Bawendi, M. Type-II quantum dots: CdTe/CdSe (core/shell) and CdSe/ZnTe (core/shell) heterostructures. J. Am. Chem. Soc. 125, 11466–11467 (2003).
3. Smith, J. N., Meadows, J. & Williams, P. A. Sorption of polyvinylpyrrolidone onto polystyrene lattices and the effect on colloid stability. Langmuir 12, 3773–3778 (1996).
4. Silva, T. J. & Schultz, S. A scanning near-field optical microscope for the imaging of magnetic domains inreflection. Rev. Sci. Instrum. 67, 715–725 (1996).
5. Kalele, S. A. et al. Optical detection of antibody using silica–silver core–shell particles. Chem. Phys. Lett. 404, 136–141 (2005).
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献