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Formation, characterization and appl...

Newman, Janelle Dawn Secl.

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Formation, characterization and applications of gold nanoparticles and surface-modified gold.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Formation, characterization and applications of gold nanoparticles and surface-modified gold./
作者:	Newman, Janelle Dawn Secl.
面頁冊數:	157 p.
附註:	Adviser: Gary J. Blanchard.
Contained By:	Dissertation Abstracts International68-05B.
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3264204
ISBN:	9780549028352

Formation, characterization and applications of gold nanoparticles and surface-modified gold.
Newman, Janelle Dawn Secl.

Formation, characterization and applications of gold nanoparticles and surface-modified gold. - 157 p.

Adviser: Gary J. Blanchard.

Thesis (Ph.D.)--Michigan State University, 2007.

Gold nanoparticles (AuNPs) have gained interest due to their unique properties. This dissertation will encompass three areas of current nanoparticle research. The first sections will discuss the formation of AuNPs using amines as both the reducing and stabilizing agent. Simple electrochemical measurements showed that the presence of the oxidation peak for an amine between the oxidation and reduction peaks of a solution of HAuCl4 was a marker for thermodynamic feasibility of AuNP formation. In addition to thermodynamic considerations, kinetics of formation are also important and were explored using time-resolved ultraviolet-visible spectroscopy to measure PR evolution. It was seen that in amine reducing agents with a single amine per reducing agent molecule, that increasing oxidation potential resulted in a decrease in the rate of PR evolution. This is consistent with the AuNP formation occurring in the Marcus inverted region. Poly(allylamine hydrochloride) (PAH) was explored as a simple polymeric amine reducing agent. The thermodynamics and kinetics of the PAH system were explored as for the monomeric amines. The equilibrium behavior of the PAH-AuNP composite was also investigated and found to be readily controlled.

ISBN: 9780549028352Subjects--Topical Terms:

586156
Chemistry, Analytical.

Formation, characterization and applications of gold nanoparticles and surface-modified gold.
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245 1 0 $a Formation, characterization and applications of gold nanoparticles and surface-modified gold.
300 $a 157 p.
500 $a Adviser: Gary J. Blanchard.
500 $a Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3017.
502 $a Thesis (Ph.D.)--Michigan State University, 2007.
520 $a Gold nanoparticles (AuNPs) have gained interest due to their unique properties. This dissertation will encompass three areas of current nanoparticle research. The first sections will discuss the formation of AuNPs using amines as both the reducing and stabilizing agent. Simple electrochemical measurements showed that the presence of the oxidation peak for an amine between the oxidation and reduction peaks of a solution of HAuCl4 was a marker for thermodynamic feasibility of AuNP formation. In addition to thermodynamic considerations, kinetics of formation are also important and were explored using time-resolved ultraviolet-visible spectroscopy to measure PR evolution. It was seen that in amine reducing agents with a single amine per reducing agent molecule, that increasing oxidation potential resulted in a decrease in the rate of PR evolution. This is consistent with the AuNP formation occurring in the Marcus inverted region. Poly(allylamine hydrochloride) (PAH) was explored as a simple polymeric amine reducing agent. The thermodynamics and kinetics of the PAH system were explored as for the monomeric amines. The equilibrium behavior of the PAH-AuNP composite was also investigated and found to be readily controlled.
520 $a The characterization of quartz crystal microbalances with alkanethiol self-assembled monolayers (SAMs) adsorbed on the Au electrodes was explored using impedance spectroscopy. The time-evolved impedance spectra for the SAMs were fitted to an equivalent circuit model and information was extracted about the assembly and viscoelastic behaviors of C6-C18 SAMs. The initial deposition of the alkanethiols was found to occur within the first minute of QCM immersion. The organization rates for the C6-C 16 SAMs were found to be similar, indicating the aliphatic chain length had little impact on the rate of SAM assembly. The viscoelastic properties of the C6 monolayer differed from those of the C9-C 16 SAMs and indicated that the shorter aliphatic chain resulted in a different solvent-monolayer interface than was seen for the longer aliphatic chain lengths. Additionally C18 was found to exhibit different behavior from the other SAMs. This was attributed to solubility limitations of the C18SH at the experimental deposition temperature.
520 $a Finally the application of AuNPs in sensors for organophosphate/phosphonate (OPP) compounds was explored. The sensors were created from the covalent attachment of AuNPs to silica gel or planar quartz. The AuNPs were then modified with zirconium-phosphorous (ZP) chemistry to create a sensor which was class-selective for OPP compounds. Both the silica gel and planar quartz substrates exhibited a spectral blue-shift when exposed to OPP compounds which could be attributed to changes in the local dielectric environment associated with OPP binding. The limit of detection was seen to be in the range of 5 x 10-7 to 5 x 10-5 M for the silica gel and planar quartz platforms, respectively. Additionally, the equilibrium of the binding was explored using the silica gel-AuNP-ZP sensor and estimated to have a K &sim; 2 x 10 6 M-1.
590 $a School code: 0128.
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