Effects of annealing on bandgap and surface plasmon resonance enhancement in Au/SnO2 quantum dots |
| |
| Affiliation: | 1. Department of Mechanical and Industrial Engineering, University of Dar es Salaam, P. O. Box 35131, Dar es Salaam, Tanzania;2. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea;3. Membrane Innovation Center for Anti-Virus & Air-Quality Control, KAIST Institute Nanocentury, 291, Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea;1. School of Chemistry and Materials Science, Ludong University, Yantai 264025, China;2. Alan G. MacDiarmid Institute, Jilin University, Changchun 130012, China |
| |
| Abstract: | Au/SnO2 quantum dots (AuSQDs) were synthesized, and the effects of annealing on their structural and optical properties were examined. Significant changes were observed in the bandgap and surface plasmon resonance (SPR) of the AuSQDs after thermal treatment at different temperatures (400, 500, and 600 °C). The properties of the as-prepared and annealed samples were characterized via X-ray diffraction analysis, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy, and diffuse reflectance spectroscopy. Annealing reduced the bandgap from 3.03 to 2.33 eV and increased the crystallinity while maintaining an average crystallite size below 10 nm. XPS valence band (VB) profiles provided information regarding the VB edge potentials, which helped to determine the conduction band edge potentials. An enhancement in the SPR of the Au nanoparticles was observed for AuSQD-500, which had the smallest bandgap among the samples investigated. |
| |
| Keywords: | Quantum dots Annealing effect Optical properties |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
