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The Effect of Carbon Layer Variation...

Gofus, John Stephen, III.

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The Effect of Carbon Layer Variations in Carbon/Porous Silicon Composite Rugate Filters for End-of-Service-Life Indicators.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Effect of Carbon Layer Variations in Carbon/Porous Silicon Composite Rugate Filters for End-of-Service-Life Indicators./
Author:	Gofus, John Stephen, III.
Description:	34 p.
Notes:	Source: Masters Abstracts International, Volume: 54-04.
Contained By:	Masters Abstracts International54-04(E).
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1585707
ISBN:	9781321646634

The Effect of Carbon Layer Variations in Carbon/Porous Silicon Composite Rugate Filters for End-of-Service-Life Indicators.
Gofus, John Stephen, III.

The Effect of Carbon Layer Variations in Carbon/Porous Silicon Composite Rugate Filters for End-of-Service-Life Indicators. - 34 p.

Source: Masters Abstracts International, Volume: 54-04.

Thesis (M.S.)--University of California, San Diego, 2015.

Carbon/porous silicon composite rugate filters, for use as end-of service-life indicators in gas mask filters, are more capable of increased sensitivity to volatile organic chemical vapors than porous silicon sensors alone. Compositional variations of the carbon layer within these composite materials have not been well studied. At low carbon content, the carbonized surface will not effectively mimic the active carbon used in gas mask filters. At high carbon content, there is increased noise and a broader, less intense rugate stop band, reducing the signal to noise level of the sensor response. The focus of this thesis is the optimization of the carbon layer in the carbon/porous silicon composite rugate filters. To accomplish this, porous silicon rugate filters were etched and then carbonized using varying concentrations of the poly(furfuryl alcohol) precursor. Variations in the carbon layer were then analyzed via spectral analysis, elemental analysis, and nitrogen adsorption/desorption isotherms. At concentrations greater than 50% furfuryl alcohol there is minimal difference observed in the carbon layer on the porous silicon surface. Samples were also shown to have a minimal increase in sensitivity at concentrations greater than 50% furfuryl alcohol, and an increased signal-to-noise with increased furfuryl alcohol concentration. It is shown that the optimal carbon layer for volatile organic vapor sensing is achieved by using a furfuryl alcohol concentration of 50% furfuryl alcohol (in ethanol) during carbon layer synthesis.

ISBN: 9781321646634Subjects--Topical Terms:

543314
Materials science.

The Effect of Carbon Layer Variations in Carbon/Porous Silicon Composite Rugate Filters for End-of-Service-Life Indicators.
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100 1 $a Gofus, John Stephen, III. $3 3276642
245 1 4 $a The Effect of Carbon Layer Variations in Carbon/Porous Silicon Composite Rugate Filters for End-of-Service-Life Indicators.
300 $a 34 p.
500 $a Source: Masters Abstracts International, Volume: 54-04.
500 $a Adviser: Michael J. Sailor.
502 $a Thesis (M.S.)--University of California, San Diego, 2015.
520 $a Carbon/porous silicon composite rugate filters, for use as end-of service-life indicators in gas mask filters, are more capable of increased sensitivity to volatile organic chemical vapors than porous silicon sensors alone. Compositional variations of the carbon layer within these composite materials have not been well studied. At low carbon content, the carbonized surface will not effectively mimic the active carbon used in gas mask filters. At high carbon content, there is increased noise and a broader, less intense rugate stop band, reducing the signal to noise level of the sensor response. The focus of this thesis is the optimization of the carbon layer in the carbon/porous silicon composite rugate filters. To accomplish this, porous silicon rugate filters were etched and then carbonized using varying concentrations of the poly(furfuryl alcohol) precursor. Variations in the carbon layer were then analyzed via spectral analysis, elemental analysis, and nitrogen adsorption/desorption isotherms. At concentrations greater than 50% furfuryl alcohol there is minimal difference observed in the carbon layer on the porous silicon surface. Samples were also shown to have a minimal increase in sensitivity at concentrations greater than 50% furfuryl alcohol, and an increased signal-to-noise with increased furfuryl alcohol concentration. It is shown that the optimal carbon layer for volatile organic vapor sensing is achieved by using a furfuryl alcohol concentration of 50% furfuryl alcohol (in ethanol) during carbon layer synthesis.
590 $a School code: 0033.
650 4 $a Materials science. $3 543314
650 4 $a Nanotechnology. $3 526235
650 4 $a Analytical chemistry. $3 3168300
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710 2 $a University of California, San Diego. $b Chemistry. $3 1023460
773 0 $t Masters Abstracts International $g 54-04(E).
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792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1585707