Synthesis and Shape-Dependent Optical, Electrical Properties and Photocatalytic Activity of Gold–Cuprous Oxide Core–Shell Nanocrystals

• Main Authors: Yang, Yu-Chen, 楊右丞
• Other Authors: Gwo, Shangjr
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/68131841153645285940

博士 === 國立清華大學 === 物理系 === 101 === Nanoscience and nanotechnology has become emerging fields of research today because materials at nanoscale usually present different and unique chemical and physical properties compared to the bulk. For nanopaticles, the size-related properties that are missing in the bulk counterparts are in particular of great scientific interests. Quantum confinement is, for example, one of the most fascinating phenomena exclusively existing in low-dimensional nano domains. The last decade has witnessed the exploration in the research of morphology and crystallinity control at nanoscale in order to obtain desired size-related properties, which may enable various applications in photocatalysis, surface-enhanced Raman scattering (SERS), biosensing, bioimaging, and even therapy. So far, most studies of the fundamental physical properties such as electrical and optical properties are limited to the nanoparticles with spherical symmetry. Therefore, the shape-dependent properties of these nanocrystals are rarely observed. In this dissertation, we developed reliable and robust methods for deterministic synthesis of Cu2O semiconductor nanoparticles and Au–Cu2O metal–semiconductor core–shell nanocomposites with well-defined morphology. We comprehensively studied their size-, shape- and facet-dependent electrical, photo-catalytic and optical properties.