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Thin Film van der Waals Heterostructures Containing MoSe 2 from Modulated Elemental Precursors.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Thin Film van der Waals Heterostructures Containing MoSe 2 from Modulated Elemental Precursors./
作者:	Hadland, Erik Christian.
面頁冊數:	1 online resource (202 pages)
附註:	Source: Dissertations Abstracts International, Volume: 80-08, Section: B.
Contained By:	Dissertations Abstracts International80-08B.
標題:	Chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10975033click for full text (PQDT)
ISBN:	9780438882461

Thin Film van der Waals Heterostructures Containing MoSe 2 from Modulated Elemental Precursors.
Hadland, Erik Christian.

Thin Film van der Waals Heterostructures Containing MoSe 2 from Modulated Elemental Precursors. - 1 online resource (202 pages)

Source: Dissertations Abstracts International, Volume: 80-08, Section: B.

Thesis (Ph.D.)--University of Oregon, 2018.

Includes bibliographical references

Transition metal dichalcogenides (TMDs) are naturally occurring layered materials that have attracted immense research interest due to their high degree of chemical tunability. In particular, MoSe2 has been the focus of significant investigation stemming from reports that it converts to a direct band gap semiconductor material at ultralow dimensions. Yet, as more and more is learned about increasingly thin MoSe2, efforts are now aimed at imparting the novel functionality of MoSe2 into van der Waals heterostructures. This dissertation focuses on synthesis and characterization of novel MoSe2-based nanolaminate structures that have been self assembled from modulated elemental precursors. The first section describes a new treatment of x-ray fluorescence spectroscopy data and its use as a powerful probe for determining the absolute composition per unit area of a thin film with sub-monolayer accuracy. While this has widespread application in the thin film world, it is particularly useful for MER synthesis in the calibration of modulated elemental precursors. In order to crystallize a target structure, it is imperative to deposit the correct number of atoms, which is now possible with greater precision. The second section shows the importance of rotational (i.e. "turbostratic") disorder on lowering cross-plane thermal conductivity in two systems-MoSe 2 and the (SnSe2)1(MoSe2)1.32 heterostructure. The binary systems exhibits ultralow thermal conductivity that rivals that of WSe2, yet some interlayer atomic registry was noted in TEM images. By interleaving layers of MoSe2 with SnSe2-which also possesses hexagonal symmetry, but has a significantly larger basal plane-the cross-plane thermal iv conductivity was depressed to the lowest reported value in the literature for a fully dense solid. The final section presents the synthesis and characterization of a new, ternary phase of Bi|Mo|Se. The structure consists of alternating layers of a "puckered" rock salt BiSe lattice and nanosheets of MoSe 2. Notably, the MoSe2 sublattice consists of a mixture of the semiconducting 2H phase (~60%) and the metallic 1T phase (~40%). This is the result of electron injection from the BiSe into the conduction band of the MoSe2, which is known to undergo a rearrangement upon reduction. This dissertation includes previously published and unpublished coauthored materials.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9780438882461Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

MaterialsIndex Terms--Genre/Form:

542853
Electronic books.

Thin Film van der Waals Heterostructures Containing MoSe 2 from Modulated Elemental Precursors.
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500 $a Source: Dissertations Abstracts International, Volume: 80-08, Section: B.
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500 $a Advisor: Boettcher, Shannon W.; Johnson, David C.
502 $a Thesis (Ph.D.)--University of Oregon, 2018.
504 $a Includes bibliographical references
520 $a Transition metal dichalcogenides (TMDs) are naturally occurring layered materials that have attracted immense research interest due to their high degree of chemical tunability. In particular, MoSe2 has been the focus of significant investigation stemming from reports that it converts to a direct band gap semiconductor material at ultralow dimensions. Yet, as more and more is learned about increasingly thin MoSe2, efforts are now aimed at imparting the novel functionality of MoSe2 into van der Waals heterostructures. This dissertation focuses on synthesis and characterization of novel MoSe2-based nanolaminate structures that have been self assembled from modulated elemental precursors. The first section describes a new treatment of x-ray fluorescence spectroscopy data and its use as a powerful probe for determining the absolute composition per unit area of a thin film with sub-monolayer accuracy. While this has widespread application in the thin film world, it is particularly useful for MER synthesis in the calibration of modulated elemental precursors. In order to crystallize a target structure, it is imperative to deposit the correct number of atoms, which is now possible with greater precision. The second section shows the importance of rotational (i.e. "turbostratic") disorder on lowering cross-plane thermal conductivity in two systems-MoSe 2 and the (SnSe2)1(MoSe2)1.32 heterostructure. The binary systems exhibits ultralow thermal conductivity that rivals that of WSe2, yet some interlayer atomic registry was noted in TEM images. By interleaving layers of MoSe2 with SnSe2-which also possesses hexagonal symmetry, but has a significantly larger basal plane-the cross-plane thermal iv conductivity was depressed to the lowest reported value in the literature for a fully dense solid. The final section presents the synthesis and characterization of a new, ternary phase of Bi|Mo|Se. The structure consists of alternating layers of a "puckered" rock salt BiSe lattice and nanosheets of MoSe 2. Notably, the MoSe2 sublattice consists of a mixture of the semiconducting 2H phase (~60%) and the metallic 1T phase (~40%). This is the result of electron injection from the BiSe into the conduction band of the MoSe2, which is known to undergo a rearrangement upon reduction. This dissertation includes previously published and unpublished coauthored materials.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Chemistry. $3 516420
650 4 $a Inorganic chemistry. $3 3173556
653 $a Materials
653 $a Solid state
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710 2 $a University of Oregon. $b Chemistry and Biochemistry. $3 3195131
773 0 $t Dissertations Abstracts International $g 80-08B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10975033 $z click for full text (PQDT)