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osu1163772131.pdf (12.96 MB)
ETD Abstract Container
Abstract Header
Nanostructures by gas-phase reactions: growth and applications
Author Info
Carney, Carmen M.
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=osu1163772131
Abstract Details
Year and Degree
2006, Doctor of Philosophy, Ohio State University, Materials Science and Engineering.
Abstract
Gas-phase reactions between H
2
and SnO
2
surfaces led to novel nanostructures. Nanosheets of SnO
2
were produced by a gas-phase reaction of solid SnO
2
sintered disks in a reducing atmosphere between 700 and 800 degrees Celsius. The surface morphology was controlled by varying the reaction time and partial pressure of oxygen. It was found that SnO
2
was etched by a reaction between H
2
and lattice oxygen and a loss of SnO to the vapor phase. Single-crystalline nanofibers of SnO
2
were synthesized by a gas-phase reaction of solid SnO
2
sintered disks in a reducing atmosphere between 650 and 750 degrees Celsius. The resulting nanostructures grew on regions of the sample that were coated with gold, which acted as a collector of SnO vapor. The nanofiber length was controlled by varying the reaction time and by the sintering agent used to densify the SnO
2
. SnO
2
thin films were manufactured using DC reactive magnetron sputtering from a tin target in an Ar/O
2
atmosphere. After exposure to H
2
gas at temperatures between 600 and 680 degrees Celsius, nanofibers were grown on the surface with the aid of gold particles. The nanofiber growth was controlled by varying the reaction time and the orientation of the SnO
2
films. The gold was shown to be necessary for both initiation and continuation of growth. Sensing tests were conducted with pure TiO
2
and mixed oxide samples of TiO
2
and SnO
2
sintered samples having different surface areas. Nanostructures of solid solutions and spinodally decomposed samples of mixed oxides of SnO
2
and TiO
2
were compared to the oriented nanofibers formed in pure TiO
2
created by the same heat treatment. Thin films with SnO
2
nanofibers were also tested for their sensing response to H
2
. Comparisons between the sensing characteristics of the samples were made to determine that those samples with high surface areas and those with a gold coating were more sensitive to H
2
in the presence of O
2
.
Committee
Sheikh Akbar (Advisor)
Pages
222 p.
Subject Headings
Engineering, Materials Science
Keywords
nanofibers
;
tin dioxide
;
vapor phase processing
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Refworks
EndNote
RIS
Mendeley
Citations
Carney, C. M. (2006).
Nanostructures by gas-phase reactions: growth and applications
[Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1163772131
APA Style (7th edition)
Carney, Carmen.
Nanostructures by gas-phase reactions: growth and applications.
2006. Ohio State University, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=osu1163772131.
MLA Style (8th edition)
Carney, Carmen. "Nanostructures by gas-phase reactions: growth and applications." Doctoral dissertation, Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1163772131
Chicago Manual of Style (17th edition)
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Document number:
osu1163772131
Download Count:
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Copyright Info
© 2006, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.