| The objective of this thesis is to develop the SEHRS and SERS on novel substrates and to explore their chemical/biological applications.; Chapter 1 briefly introduces the surface-enhanced Raman scattering and surface-enhanced hyper-Raman scattering.; Chapter 2 describes the preparation of silver, gold, and copper nanoparticles on smooth electrode surfaces. Chemically prepared nanoparticles show the more efficient SERS activity than electrochemically prepared nanoparticles.; Chapter 3 and 4 describes the preparation, characterization, and applications of iron and osmium nanoparticles, respectively. Remarkable SERS activity has been observed on both iron and osmium nanoparticles-on-electrode settings. Both kinds of nanoparticles display the efficient electrocatalytic activity toward the redox of H2O2 and the oxidation of NO.; In chapter 5, SERS studies have been carried out on Cu2S nanowires array and single nanowire. When exposure to the laser irradiation, Cu 2S nanowires may undergo disproportionating reaction and produce CuS and SERS-active Cu. SERS spectra of as-produced CuS, sub-layer Cu2S and pyridine adsorbates were obtained on single and multi nanowires at different potentials.; Chapter 7 to 10 systematically presents high quality SEHRS and SERS spectra of various molecules including pyridine, pyrazine, benzene, 1,2-bis(4-pyridyl)acetylene, 1,2-bis(4-pyridyl)ethylene, 1,2-bis(4-pyridyl)ethane, 4-phenylpyridine, 4,4′-bipyridine, benzonitrile, and 4-cyanopyridine, obtained on efficient silver nanoparticles-on-smooth-silver-electrode settings at different potentials. The results demonstrate that the hyper-Raman spectra from noncentrosymmetric molecules contain the information of IR and Raman, while hyper-Raman spectra from centrosymmetric molecules provide the complementary information to IR and Raman.; Chapter 11 reports the high quality SEHRS and SERS spectra of thiol and disulfide based molecules at different potentials. The results demonstrated that thiol and disulfide molecules were chemisorbed on silver nanoparticles as thiolates via the interaction of sulphur to silver surface due to the cleavage of S-H and S-S bonds, respectively.; In chapter 12, SERS, SERBS, and cyclic voltammetry (CV) have been employed to study the electrochemical behaviors of 1-(4-pyridyl)pyridinium chloride hydrochloride on silver nanoparticles. The results demonstrated that organic film with polymeric structure was formed on silver nanoparticles as characterized by XPS and ToF-SIMS. (Abstract shortened by UMI.)... |
