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Accessing Controlled Nanostructures ...

Pachuta, Kevin.

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Accessing Controlled Nanostructures from Lithium Cobalt Oxide.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Accessing Controlled Nanostructures from Lithium Cobalt Oxide./
Author:	Pachuta, Kevin.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	243 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-10, Section: B.
Contained By:	Dissertations Abstracts International82-10B.
Subject:	Chemistry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28392203
ISBN:	9798569997770

Accessing Controlled Nanostructures from Lithium Cobalt Oxide.
Pachuta, Kevin.

Accessing Controlled Nanostructures from Lithium Cobalt Oxide. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 243 p.

Source: Dissertations Abstracts International, Volume: 82-10, Section: B.

Thesis (Ph.D.)--Case Western Reserve University, 2021.

This item must not be sold to any third party vendors.

The exfoliation of lithium cobalt oxide, a layered transition metal oxide, was investigated extensively using a two-step soft-chemical method to access cobalt oxide nanostructures. Through these studies, a deeper understanding of the exfoliation conditions necessary for the production of cobalt oxide nanosheets from protic lithium cobalt oxide was developed. These conditions involve aqueous reaction environments, hydroxide groups, bulky tetramethylammonium ions in solution, and high proton replacement in protic lithium cobalt oxide. Further reaction conditions, such as tetraalkylammonium ion concentration and ionic size, powder aging, reaction time, stir rate, and loading concentration gave deeper insights into exfoliation yield. Through these experimental results, exfoliation mechanisms of protic lithium cobalt oxide to form cobalt oxide nanosheets were determined. Furthermore, these insights led to new methods for producing cobalt oxide nanosheets, such as the exfoliation of large and ultrathin cobalt oxide nanosheets in pH neutral solutions, the stability of cobalt oxide nanosheets in non-aqueous solvents, and the production of high concentration cobalt oxide nanosheets solutions. Through these methods, the exfoliation, dispersion, and stability of cobalt oxide nanosheets were effectively controlled and understood yielding opportunities for new electronic applications and fundamental studies. Next, the effects of mechanical work (e.g., sonication and centrifugation) applied to cobalt oxide nanosheets demonstrated effects on UV-Vis absorption spectra related to the concentration, particle size, and electronic band structure. Then, advanced scanning probe microscopy techniques examined the fundamental electronic, optoelectronic, and electromechanical properties of cobalt oxide nanosheets; this revealed the work function of the cobalt oxide nanosheets to be 4.55 ± 0.19 eV, with no light or thickness dependence. Lastly, the catalytic performance (e.g. photocatalytic dye degradation and carbon monoxide oxidation) of lithium cobalt oxide was significantly enhanced through the targeted manipulation of the morphology and defect structure (i.e., chemically treated lithium cobalt oxide powders). This was attributed to the presence of lithium and oxygen defects, surface protonation, and increases in surface area. In summary, this work has demonstrated a significant step forward in understanding the processing-structure-property relationships during the exfoliation of lithium cobalt oxide to form cobalt oxide nanosheets, advancing their potential in technological and industrial use.

ISBN: 9798569997770Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

Cobalt Oxide Nanosheets

Accessing Controlled Nanostructures from Lithium Cobalt Oxide.
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245 1 0 $a Accessing Controlled Nanostructures from Lithium Cobalt Oxide.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 243 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-10, Section: B.
500 $a Advisor: Sehirlioglu, Alp;Pentzer, Emily.
502 $a Thesis (Ph.D.)--Case Western Reserve University, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a The exfoliation of lithium cobalt oxide, a layered transition metal oxide, was investigated extensively using a two-step soft-chemical method to access cobalt oxide nanostructures. Through these studies, a deeper understanding of the exfoliation conditions necessary for the production of cobalt oxide nanosheets from protic lithium cobalt oxide was developed. These conditions involve aqueous reaction environments, hydroxide groups, bulky tetramethylammonium ions in solution, and high proton replacement in protic lithium cobalt oxide. Further reaction conditions, such as tetraalkylammonium ion concentration and ionic size, powder aging, reaction time, stir rate, and loading concentration gave deeper insights into exfoliation yield. Through these experimental results, exfoliation mechanisms of protic lithium cobalt oxide to form cobalt oxide nanosheets were determined. Furthermore, these insights led to new methods for producing cobalt oxide nanosheets, such as the exfoliation of large and ultrathin cobalt oxide nanosheets in pH neutral solutions, the stability of cobalt oxide nanosheets in non-aqueous solvents, and the production of high concentration cobalt oxide nanosheets solutions. Through these methods, the exfoliation, dispersion, and stability of cobalt oxide nanosheets were effectively controlled and understood yielding opportunities for new electronic applications and fundamental studies. Next, the effects of mechanical work (e.g., sonication and centrifugation) applied to cobalt oxide nanosheets demonstrated effects on UV-Vis absorption spectra related to the concentration, particle size, and electronic band structure. Then, advanced scanning probe microscopy techniques examined the fundamental electronic, optoelectronic, and electromechanical properties of cobalt oxide nanosheets; this revealed the work function of the cobalt oxide nanosheets to be 4.55 ± 0.19 eV, with no light or thickness dependence. Lastly, the catalytic performance (e.g. photocatalytic dye degradation and carbon monoxide oxidation) of lithium cobalt oxide was significantly enhanced through the targeted manipulation of the morphology and defect structure (i.e., chemically treated lithium cobalt oxide powders). This was attributed to the presence of lithium and oxygen defects, surface protonation, and increases in surface area. In summary, this work has demonstrated a significant step forward in understanding the processing-structure-property relationships during the exfoliation of lithium cobalt oxide to form cobalt oxide nanosheets, advancing their potential in technological and industrial use.
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653 $a Nanosheets
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