| Summary: | 碩士 === 國立清華大學 === 化學工程學系 === 102 === This study aims to obtain metal nanoaprticles and metal@semiconductor core-shell heterostructures. With controllable shape and size were used to TOP and oleylamine to reduce copper chloride at high temperature, and separate the nucleation and growth process by a hot injection method to obtain the Cu nanoparticles with monodispersity in size and shape. We characterize the morphology and the projected image of nanoparticles via SEM and TEM. X-ray diffraction patterns were used to analyze the crystalline structure of products, and to study their surface properties via both XPS and FTIR measurements. Nanosized Cu is a noble metal known to display localized surface plasmon resonance (LSPR) in the visible region. Hence, we investigated their optical properties by UV-visible spectroscopy and characterize the optical properties of single particle via dark-field microscopy.
We obtained Au@CdSe core-shell nanorods by applying a catoin-exchange strategy. The shell thickness of products can be tuned by adding different amount of Cd(NO3)2. We used HRTEM, SAED and EDX analysis to verify the crystallographic geometry and composition of the products. We also discussed the relationship between shell thickness and optical property via UV-visible spectroscopy. Finally, the charge transfer phenomenon between Au and CdSe was investigated by different extinction sources, including UV light and a 532 laser.
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