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Optical Studies of Excitonic Effects...

Ajayi, Obafunso Ademilolu.

Optical Studies of Excitonic Effects at Two-Dimensional Nanostructure Interfaces.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Optical Studies of Excitonic Effects at Two-Dimensional Nanostructure Interfaces.
Author:	Ajayi, Obafunso Ademilolu.
Published:	Ann Arbor : ProQuest Dissertations & Theses, 2017
Description:	102 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.
Notes:	Adviser: James C. Hone.
Contained By:	Dissertation Abstracts International78-07B(E).
Subject:	Nanotechnology.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10254570
ISBN:	9781369520675

Optical Studies of Excitonic Effects at Two-Dimensional Nanostructure Interfaces.
Ajayi, Obafunso Ademilolu.

Optical Studies of Excitonic Effects at Two-Dimensional Nanostructure Interfaces. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 102 p.

Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.

Thesis (Ph.D.)--Columbia University, 2017.

Atomically thin two-dimensional nanomaterials such as graphene and transition metal dichalcogenides (TMDCs) have seen a rapid growth of exploration since the isolation of monolayer graphene. These materials provide a rich field of study for physics and optoelectronics applications. Many applications seek to combine a two dimensional (2D) material with another nanomaterial, either another two dimensional material or a zero (0D) or one dimensional (1D) material. The work in this thesis explores the consequences of these interactions from 0D to 2D.

ISBN: 9781369520675Subjects--Topical Terms:

193873
Nanotechnology.

Optical Studies of Excitonic Effects at Two-Dimensional Nanostructure Interfaces.
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245 1 0 $a Optical Studies of Excitonic Effects at Two-Dimensional Nanostructure Interfaces.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 102 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.
500 $a Adviser: James C. Hone.
502 $a Thesis (Ph.D.)--Columbia University, 2017.
520 $a Atomically thin two-dimensional nanomaterials such as graphene and transition metal dichalcogenides (TMDCs) have seen a rapid growth of exploration since the isolation of monolayer graphene. These materials provide a rich field of study for physics and optoelectronics applications. Many applications seek to combine a two dimensional (2D) material with another nanomaterial, either another two dimensional material or a zero (0D) or one dimensional (1D) material. The work in this thesis explores the consequences of these interactions from 0D to 2D.
520 $a We begin in Chapter 2 with a study of energy transfer at 0D-2D interfaces with quantum dots and graphene. In our work we seek to maximize the rate of energy transfer by reducing the distance between the materials. We observe an interplay with the distance-dependence and surface effects from our halogen terminated quantum dots that affect our observed energy transfer. In Chapter 3 we study supercapacitance in composite graphene oxide-carbon nanotube electrodes. At this 2D-1D interface we observe a compounding effect between graphene oxide and carbon nanotubes. Carbon nanotubes increase the accessible surface area of the supercapacitors and improve conductivity by forming a conductive pathway through electrodes.
520 $a In Chapter 4 we investigate effective means of improving sample quality in TMDCs and discover the importance of the monolayer interface. We observe a drastic improvement in photoluminescence when encapsulating our TMDCs with Boron Nitride. We measure spectral linewidths approaching the intrinsic limit due to this 2D-2D interface. We also effectively reduce excess charge and thus the trion-exciton ratio in our samples through substrate surface passivation. In Chapter 5 we briefly discuss our investigations on chemical doping, heterostructures and interlayer decoupling in ReS2. We observe an increase in intensity for p-doped MoS2 samples. We investigated the charge transfer exciton previously identified in heterostructures. Spectral observation of this interlayer exciton remained elusive in our work but provided the motivation for our work in Chapter 4. We also discuss our preliminary results on interlayer decoupling in ReS2.
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650 4 $a Optics. $3 204142
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