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Mercury adsorption to gold nanoparti...

Morris, Todd Ashley.

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Mercury adsorption to gold nanoparticle and thin film surfaces.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Mercury adsorption to gold nanoparticle and thin film surfaces./
作者:	Morris, Todd Ashley.
面頁冊數:	128 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1838.
Contained By:	Dissertation Abstracts International65-04B.
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3128173
ISBN:	049675436X

Mercury adsorption to gold nanoparticle and thin film surfaces.
Morris, Todd Ashley.

Mercury adsorption to gold nanoparticle and thin film surfaces. - 128 p.

Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1838.

Thesis (Ph.D.)--The University of Alabama, 2004.

Mercury adsorption to gold nanoparticle and thin film surfaces was monitored by spectroscopic techniques. Adsorption of elemental mercury to colloidal gold nanoparticles causes a color change from wine-red to orange that was quantified by UV-Vis absorption spectroscopy. The wavelength of the surface plasmon mode of 5, 12, and 31 nm gold particles blue-shifts 17, 14, and 7.5 nm, respectively, after a saturation exposure of mercury vapor. Colorimetric detection of inorganic mercury was demonstrated by employing 2.5 nm gold nanoparticles. The addition of low microgram quantities of Hg 2+ to these nanoparticles induces a color change from yellow to peach or blue. It is postulated that Hg2+ is reduced to elemental mercury by SCN- before and/or during adsorption to the nanoparticle surface.

ISBN: 049675436XSubjects--Topical Terms:

586156
Chemistry, Analytical.

Mercury adsorption to gold nanoparticle and thin film surfaces.
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245 1 0 $a Mercury adsorption to gold nanoparticle and thin film surfaces.
300 $a 128 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1838.
500 $a Chairman: Gregory J. Szulczewski.
502 $a Thesis (Ph.D.)--The University of Alabama, 2004.
520 $a Mercury adsorption to gold nanoparticle and thin film surfaces was monitored by spectroscopic techniques. Adsorption of elemental mercury to colloidal gold nanoparticles causes a color change from wine-red to orange that was quantified by UV-Vis absorption spectroscopy. The wavelength of the surface plasmon mode of 5, 12, and 31 nm gold particles blue-shifts 17, 14, and 7.5 nm, respectively, after a saturation exposure of mercury vapor. Colorimetric detection of inorganic mercury was demonstrated by employing 2.5 nm gold nanoparticles. The addition of low microgram quantities of Hg 2+ to these nanoparticles induces a color change from yellow to peach or blue. It is postulated that Hg2+ is reduced to elemental mercury by SCN- before and/or during adsorption to the nanoparticle surface.
520 $a It has been demonstrated that surface plasmon resonance spectroscopy (SPRS) is sensitive to mercury adsorption to gold and silver surfaces. By monitoring the maximum change in reflectivity as a function of amount of mercury adsorbed to the surface, 50 nm Ag films were shown to be 2--3 times more sensitive than 50 nm Au films and bimetallic 15 nm Au/35 nm Ag films. In addition, a surface coverage of &sim;40 ng Hg/cm2 on the gold surface results in a 0.03° decrease in the SPR angle of minimum reflectivity. SPRS was employed to follow Hg exposure to self-assembled monolayers (SAMs) on Au. The data indicate that the hydrophilic or hydrophobic character of the SAM has a significant effect on the efficiency of Hg penetration. Water adsorbed to carboxylic acid end group of the hydrophilic SAMs is believed to slow the penetration of Hg compared to methyl terminated SAMs.{09}Finally, two protocols were followed to remove mercury from gold films: immersion in concentrated nitric acid and thermal annealing up to 200°C. The latter protocol is preferred because it removes all of the adsorbed mercury from the gold surface and does not affect the morphology of the gold surface.
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