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BL
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| Record Number
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861860
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| Main Entry
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Holwill, Matthew
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| Title & Author
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Nanomechanics in van der Waals heterostructures /\ Matthew Holwill.
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| Publication Statement
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Cham :: Springer,, [2019]
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, ©2019
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| Series Statement
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Springer theses
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| Page. NO
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1 online resource :: color illustrations
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| ISBN
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3030185281
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: 303018529X
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: 3030185303
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: 3030185311
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: 9783030185282
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: 9783030185299
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: 9783030185305
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: 9783030185312
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9783030185282
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| Notes
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"Doctoral thesis accepted by the University of Manchester, Manchester, UK."
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| Bibliographies/Indexes
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Includes bibliographical references.
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| Contents
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Intro; Supervisor's Foreword; Abstract; Acknowledgements; Contents; Abbreviations; 1 Introduction; 1.1 Outline; References; 2 Properties of Two-Dimensional Materials; 2.1 Introduction; 2.2 Electronic bandstructures; 2.2.1 Graphene Tight Binding; 2.2.2 hBN bandstructure; 2.3 Mechanical Properties; 2.4 Capacitance and Field Effect; 2.5 Closing Remarks; References; 3 van der Waals Heterostructures; 3.1 Introduction; 3.2 van der Waals Forces; 3.3 Graphene on Hexagonal Boron Nitride-A Short History; 3.3.1 Moiré Superlattice; 3.3.2 Electronic Characteristics; 3.3.3 Mechanical Characteristics
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3.4 Intentions of This ThesisReferences; 4 Fabrication and Characterisation Techniques; 4.1 Introduction; 4.2 Fabrication Techniques; 4.2.1 Flake Preparation, Selection and Alignment; 4.2.2 Lithography; 4.2.3 Etching Techniques; 4.2.4 Metal Deposition, Lift-Off and Bonding; 4.3 Characterisation Techniques; 4.3.1 Electron Transport; 4.3.2 Raman Spectroscopy; 4.3.3 Scanning Electron Microscopy; 4.3.4 Atomic Force Microscopy; 4.3.5 Scanning Tunnelling Microscopy/Spectroscopy; 4.4 Closing Remarks; References; 5 Studying Superlattice Kinks via Electronic Transport; 5.1 Introduction
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5.2 Concept and Design5.3 Device Fabrication; 5.4 Initial Characterisation; 5.5 Redesigned Devices; 5.5.1 Measurement Process and Results; 5.6 Discussion; 5.6.1 Future Work; 5.7 Conclusions; References; 6 Atomic Force Microscopy Studiespg of Superlattice Kinks; 6.1 Introduction; 6.2 Concept, Design and Fabrication; 6.3 Initial Device Characterisation and Measurement Process; 6.3.1 Measurement Process; 6.4 Results; 6.5 Discussion; 6.5.1 Drift; 6.6 Conclusions; References; 7 Additional Work; 7.1 Introduction; 7.2 Scanning Tunnelling Microscopy; 7.3 Umklapp Devices
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7.4 Molybdenum Ditelluride (MoTe2)References; 8 Conclusions and Future Work; A Thermal Drift and Additional Resultspg for Chap. [ThermalExpansionCoefficientDevices]6
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| Abstract
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Micro/nano-mechanical systems are a crucial part of the modern world providing a plethora of sensing and actuation functionalities used in everything from the largest cargo ships to the smallest hand-held electronics; from the most advanced scientific and medical equipment to the simplest household items. Over the past few decades, the processes used to produce these devices have improved, supporting dramatic reductions in size, but there are fundamental limits to this trend that require a new production paradigm. The 2004 discovery of graphene ushered in a new era of condensed matter physics research, that of two-dimensional materials. Being only a few atomic layers thick, this new class of materials exhibit unprecedented mechanical strength and flexibility and can couple to electric, magnetic and optical signals. Additionally, they can be combined to form van der Waals heterostructures in an almost limitless number of ways. They are thus ideal candidates to reduce the size and extend the capabilities of traditional micro/nano-mechanical systems and are poised to redefine the technological sphere. This thesis attempts to develop the framework and protocols required to produce and characterise micro/nano-mechanical devices made from two-dimensional materials. Graphene and its insulating analogue, hexagonal boron nitride, are the most widely studied materials and their heterostructures are used as the test-bed for potential device architectures and capabilities. Interlayer friction, electro-mechanical actuation and surface reconstruction are some of the key phenomena investigated in this work.
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| Subject
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Nanoelectromechanical systems.
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Quasimolecules.
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Nanoelectromechanical systems.
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Quasimolecules.
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TECHNOLOGY ENGINEERING-- Engineering (General)
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TECHNOLOGY ENGINEERING-- Reference.
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| Dewey Classification
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620/.5
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| LC Classification
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QC176.8.N35
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