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Quantification of the Effects of Sur...

Aruda, Kenneth O.

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Quantification of the Effects of Surface Chemistry on Nanoparticle Photophysics.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Quantification of the Effects of Surface Chemistry on Nanoparticle Photophysics./
作者:	Aruda, Kenneth O.
面頁冊數:	178 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-10(E), Section: B.
Contained By:	Dissertation Abstracts International76-10B(E).
標題:	Physical chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3705209
ISBN:	9781321780833

Quantification of the Effects of Surface Chemistry on Nanoparticle Photophysics.
Aruda, Kenneth O.

Quantification of the Effects of Surface Chemistry on Nanoparticle Photophysics. - 178 p.

Source: Dissertation Abstracts International, Volume: 76-10(E), Section: B.

Thesis (Ph.D.)--Northwestern University, 2015.

This item is not available from ProQuest Dissertations & Theses.

This dissertation describes the effects of surface chemistry on the photophysics of metal and semiconductor nanoparticles. Chapter 1 introduces the parameters that govern the rate of photoinduced electron transfer (PET) and demonstrates that the rate of PET from CdSe quantum dots (QDs) to oxo-centered triruthenium clusters (Ru3O) depends on the structure of the chemical headgroup by which the Ru3O clusters adsorb to the QDs. The differences in the two rates of PET is attributed to differences in electronic donor/acceptor coupling between the QD and the Ru3O via i) thiol and ii) carboxylic acid binding groups. Chapter 2 reviews the role of interfacial charge transfer interactions in the optical spectra and electron dynamics of metal nanoparticles. Literature references are cited which reported the influence of the surrounding matrix on the properties of plasmon excitations (through, arguably, charge-transfer-like interactions). This review further develops the result of the previous chapter, wherein the chemical headgroup of the ligand controls coupling between the ligand and nanoparticle, applied in this case to metal nanoparticles (NPs). Chapter 3 describes the work (introduced in the previous chapter) that first reported the specific mechanisms by which the organic coating on small gold NPs influences the decay of the hot electron population generated following photoexcitation of the NPs. Chapter 4 describes the use of 1H NMR to quantify and separate the contributions of ligand adsorption constant from the per molecule exciton delocalization to the overall bathochromic shift observed in solution-phase CdSe QDs in CDCl3 for a series of para -substituted thiophenols. Chapter 5 describes the enhancement of efficiency of collisionally gated electron transfer from oleate-capped PbS QDs to benzoquinone (BQ) with increasing temperature (from 0 °C to 50 °C). This finding is attributed to increased permeability of the oleate adlayer of the QDs to BQ. The work in chapter 5 utilizes the 1H NMR technique described in the previous chapter, and further includes temperature dependent diffusion ordered NMR. The final chapter is an original research proposal to study the basic science of plasmon-enhanced circular dichroism under conditions of controlled molecular orientation through the use of Couette flow.

ISBN: 9781321780833Subjects--Topical Terms:

1981412
Physical chemistry.

Quantification of the Effects of Surface Chemistry on Nanoparticle Photophysics.
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520 $a This dissertation describes the effects of surface chemistry on the photophysics of metal and semiconductor nanoparticles. Chapter 1 introduces the parameters that govern the rate of photoinduced electron transfer (PET) and demonstrates that the rate of PET from CdSe quantum dots (QDs) to oxo-centered triruthenium clusters (Ru3O) depends on the structure of the chemical headgroup by which the Ru3O clusters adsorb to the QDs. The differences in the two rates of PET is attributed to differences in electronic donor/acceptor coupling between the QD and the Ru3O via i) thiol and ii) carboxylic acid binding groups. Chapter 2 reviews the role of interfacial charge transfer interactions in the optical spectra and electron dynamics of metal nanoparticles. Literature references are cited which reported the influence of the surrounding matrix on the properties of plasmon excitations (through, arguably, charge-transfer-like interactions). This review further develops the result of the previous chapter, wherein the chemical headgroup of the ligand controls coupling between the ligand and nanoparticle, applied in this case to metal nanoparticles (NPs). Chapter 3 describes the work (introduced in the previous chapter) that first reported the specific mechanisms by which the organic coating on small gold NPs influences the decay of the hot electron population generated following photoexcitation of the NPs. Chapter 4 describes the use of 1H NMR to quantify and separate the contributions of ligand adsorption constant from the per molecule exciton delocalization to the overall bathochromic shift observed in solution-phase CdSe QDs in CDCl3 for a series of para -substituted thiophenols. Chapter 5 describes the enhancement of efficiency of collisionally gated electron transfer from oleate-capped PbS QDs to benzoquinone (BQ) with increasing temperature (from 0 °C to 50 °C). This finding is attributed to increased permeability of the oleate adlayer of the QDs to BQ. The work in chapter 5 utilizes the 1H NMR technique described in the previous chapter, and further includes temperature dependent diffusion ordered NMR. The final chapter is an original research proposal to study the basic science of plasmon-enhanced circular dichroism under conditions of controlled molecular orientation through the use of Couette flow.
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