Two-dimensional (2D)-layered MoS2 layers have exhibited a broad set of unusual and superior material properties unattainable in any traditional bulk materials, drawing significant research interests nowadays. For instance, they present excellent semiconducting properties accompanying high carrier mobility and large current ON/OFF ratio as well as extensive in-plane strain limit and thickness, projecting high suitably for emerging flexible and stretchable electronics. Such properties and applications strongly depend on the physical orientation and chemical composition of constituent 2D layers. 2D MoS2 layers chemically grown in two distinct orientations, e.g., horizontal alignment for electronics and optoelectronics, and vertical alignment for electrochemical and sensing applications. Moreover, 2D heterostructure layers composed of vertically stacked dissimilar 2D TMDs held via weak van der Waals (vdW) attractions offer unique 2D/2D interfaces, envisioned to display exotic material properties, unattainable in their monocomponent counterparts. However, the underlying principle of their layer orientation-controlled growth and integrations are not well suited for scalable production, leaving their projected technological opportunities far from being realized for various novel applications. Herein, I study various aspects of 2D MoS2 layers that were studied from their large-area layer-orientation controlled growth and heterostructures integration to applications in stretchable electronic devices. I developed a chemical vapor deposition (CVD) synthesis, which can grow large-area ( > cm2) 2D MoS2 layers in a layer-controlled manner and investigated their underlying growth mechanism. I then developed a viable transfer approach of the as-grown 2D layers and integrated them into secondary target substrates to realize a new type of 2D MoS2-layers based heterostructures. To further extend their layer-controlled CVD growth and integration approach, a high-performance stretchable 2D MoS2-based electrical sensors were demonstrated on the elastomeric substrates with unconventional structural layouts. This study paves the way to explore this emerging atomically-thin material in realizing a wide range of unusual device and technologies which have been foreseen to be impossible otherwise.
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Doctor of Philosophy (Ph.D.)
College of Engineering and Computer Science
Electrical and Computer Engineering
Length of Campus-only Access
Doctoral Dissertation (Open Access)
Islam, Md. Ashraful, "Chemical Vapor Deposition Growth of Large Area 2D MoS2 Layers: Layer Orientation Control, Heterostructure Integration, And Applications for Stretchable Sensors." (2019). Electronic Theses and Dissertations, 2004-2019. 6780.