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Title: Synthesis of monodisperse noble metal nanoparticles
Keywords: Gold; Monodisperse; Metal; Nanoparticles; Self-assembly; Silver
Issue Date: 26-Feb-2009
Citation: ZHANG QINGBO (2009-02-26). Synthesis of monodisperse noble metal nanoparticles. ScholarBank@NUS Repository.
Abstract: This thesis work focuses on developing new preparation methods to produce monodisperse noble metal nanoparticles with controllable morphology, size, surface chemistry, composition and composition distribution within each particle. Several types of Ag, Au and Pd monometallic nanoparticles and Ag-Au bimetallic nanoparticles as well as their 3-D superlattices were fabricated. A kinetic control strategy was adopted to vary the crystallinity of monometallic Au nanoparticles formed by polyol synthesis. This kinetic control strategy was then combined with digestive ripening to produce highly monodisperse Ag icosahedral nanoparticles. These Ag icosahedral nanoparticles were used as templates in replacement reactions with Au and Pd precursors to form Au and Pd icosahedral nanoparticles. Ag-Au bimetallic nanopartaicles with homogeneous alloy structure and heterogeneous Ag@AgAu core-shell structure were synthesized by the replacement reaction between Ag nanoparticles and HAuCl4. A simple methodology based on double-layer compression was used to sort electrostatically-stabilized nanoparticles by size. Due to the uniform morphology and narrow size distribution, the as-synthesized nanoparticles could self-assemble into 3-D superlattices.
Appears in Collections:Ph.D Theses (Open)

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