Syntheses and Characterization of Rod-, Flower-, and Cube-like Nanomaterials
Date Issued
2007
Date
2007
Author(s)
Yang, Zusing
DOI
en-US
Abstract
Abstract
Nanomaterials hold great potential to be photovoltaic, electronic, magnetic, and biosensing materials because their unique electric, magnetic, and optical properties. This thesis demonstrated several synthetic strategies for the preparation of rod-, flower-, and cube-like nanomaterials, including Au-Ag and Au-Ag-Hg nanorods (NRs), Au and Ag nanoflowers (NFs), Fe3O4/Au composite nanomaterials, and Cu2O nanocubes. The preparations of Au-Ag and Au-Ag-Hg NRs were based on the deposition of Au, Ag, and Hg atoms that are reduced by ascorbate on the surface of gold NRs under alkaline conditions. Au and Ag NFs were synthesized through the use of a wet chemical method in aqueous solution. Initially the Au or Ag atoms are deposited on Au or Ag nanoparticles (NPs) to form single petals, upon which other petals are formed subsequently at their termini as a result of deposition of Au or Ag atoms. This process repeats until the flower-like nanostructures. Fe3O4/Au composite nanomaterials are grew through deposition of Au atoms on the Fe3O4 NPs (51.5 ± 10.5 nm) under similar conditions for preparation of Au NFs. Cu2O nanocubes with a band gap ~ 2.42 eV were prepared from cupric nitrate in alkaline aqueous solutions containing fructose and ascorbic acid at room temperature.
Au-Ag and Au-Ag-Hg NRs having aspect ratios 1.90-4.10 and 2.89-4.10, respectively, possess high extinction coefficients (5.02 × 109 ~ 4.73 × 1010 M-1cm-1) in the UV-vis region. Au and Ag NFs have strong absorptions in the UV-vis and near-IR region and high electronic conductivities (1.97
Subjects
奈米材料
金-銀-汞奈米棒
花狀金奈米材料
花狀銀奈米材料
金-鐵複合奈米材料
方塊狀氧化亞銅奈米粒子
nanomaterials
Au-Ag nanorods
Au-Ag-Hg nanorods
nanoflowers
Fe3O4/Au composite nanomaterials
Cu2O nanocubes
SDGs
Type
thesis
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