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Gold Nanoparticle Chemiresistor Arra...

Covington, Elizabeth Laura.

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Gold Nanoparticle Chemiresistor Arrays for Micro-Gas Chromatography Applications.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Gold Nanoparticle Chemiresistor Arrays for Micro-Gas Chromatography Applications./
Author:	Covington, Elizabeth Laura.
Description:	154 p.
Notes:	Source: Dissertation Abstracts International, Volume: 73-10(E), Section: B.
Contained By:	Dissertation Abstracts International73-10B(E).
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3519562
ISBN:	9781267455437

Gold Nanoparticle Chemiresistor Arrays for Micro-Gas Chromatography Applications.
Covington, Elizabeth Laura.

Gold Nanoparticle Chemiresistor Arrays for Micro-Gas Chromatography Applications. - 154 p.

Source: Dissertation Abstracts International, Volume: 73-10(E), Section: B.

Thesis (Ph.D.)--University of Michigan, 2012.

Thiolate-monolayer-protected gold nanoparticle (MPN) chemiresistors were studied as the sensing devices for micro-gas chromatography (microGC) systems. Because transport through chemiresistors is dominated by tunneling, they are highly sensitive. In order to improve their limit of detection, their fundamental noise was studied. Chemiresistors exhibit 1/f type noise where noise scales inversely with frequency. Chemiresistor noise was found to scale inversely with MPN film thickness. We lowered the noise prefactor of a 50x60 microm2 chemiresistor by coating a thick rather than monolayer MPN film. Electron beam induced crosslinking (EBIX) of the MPN film slightly reduced chemiresistor noise. A technique for patterning chemiresistor arrays with MPN films using EBIX was developed, and an array with four distinct MPNs was fabricated in an area &sim;600 microm 2. This is the smallest chemiresistor array reported to date. Chemiresistors were exposed to vapors and provided differential sensitivities comparable to those from larger uncrosslinked chemiresistors.

ISBN: 9781267455437Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Gold Nanoparticle Chemiresistor Arrays for Micro-Gas Chromatography Applications.
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008 150210s2012 ||||||||||||||||| ||eng d
020 $a 9781267455437
035 $a (MiAaPQ)AAI3519562
035 $a AAI3519562
040 $a MiAaPQ $c MiAaPQ
100 1 $a Covington, Elizabeth Laura. $3 2096700
245 1 0 $a Gold Nanoparticle Chemiresistor Arrays for Micro-Gas Chromatography Applications.
300 $a 154 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-10(E), Section: B.
500 $a Adviser: Cagliyan Kurdak.
502 $a Thesis (Ph.D.)--University of Michigan, 2012.
520 $a Thiolate-monolayer-protected gold nanoparticle (MPN) chemiresistors were studied as the sensing devices for micro-gas chromatography (microGC) systems. Because transport through chemiresistors is dominated by tunneling, they are highly sensitive. In order to improve their limit of detection, their fundamental noise was studied. Chemiresistors exhibit 1/f type noise where noise scales inversely with frequency. Chemiresistor noise was found to scale inversely with MPN film thickness. We lowered the noise prefactor of a 50x60 microm2 chemiresistor by coating a thick rather than monolayer MPN film. Electron beam induced crosslinking (EBIX) of the MPN film slightly reduced chemiresistor noise. A technique for patterning chemiresistor arrays with MPN films using EBIX was developed, and an array with four distinct MPNs was fabricated in an area &sim;600 microm 2. This is the smallest chemiresistor array reported to date. Chemiresistors were exposed to vapors and provided differential sensitivities comparable to those from larger uncrosslinked chemiresistors.
520 $a Chemiresistors were studied to assess their long term stability. Chemiresistors exhibited decreases in resistance over time that is likely caused by loss of MPN ligands. Temperature dependent current-voltage measurements verified the resistance change was not due to changes in the size of the MPN core. While resistance could change by orders of magnitude, vapor sensitivity did not show significant changes. Heating increased the change in resistance, but chemiresistors remained responsive after being held at 80°C for a cumulative 400 hours.
520 $a It was unknown whether tunneling in the MPN film is through the highest unoccupied molecular orbital (HOMO) or lowest unoccupied molecular orbital (LUMO). A new technique was explored to distinguish tunneling through the HOMO and LUMO by measuring the induced thermoelectric voltage caused by a temperature difference across the MPN film.
520 $a For integration into a microGC system, we fabricated a chemiresistor array on the surface of a 2.2x2.2 mm2readout circuitry chip creating a monolithic sensor system. A model for determining the optimal sensor size for a microGC system is presented. While noise is inversely proportional to chemiresistor volume, the amount of analyte detectable is proportional to volume making smaller chemiresistors able to detect lesser amounts of analyte.
590 $a School code: 0127.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Solid State. $3 1669244
650 4 $a Chemistry, Analytical. $3 586156
690 $a 0611
690 $a 0600
690 $a 0486
710 2 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 73-10B(E).
790 $a 0127
791 $a Ph.D.
792 $a 2012
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3519562