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Tunable Bandgap Narrowing Induced by Controlled Molecular Thickness in 2D Mica Nanosheets

Title
Tunable Bandgap Narrowing Induced by Controlled Molecular Thickness in 2D Mica Nanosheets
Author
김현우
Keywords
QUANTUM-CONFINEMENT; FILMS; GRAPHENE; DICHALCOGENIDES; LUMINESCENCE; STABILITY
Issue Date
2015-06
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v. 27, NO 12, Page. 4222-4228
Abstract
Bandgap engineering of atomically thin 2D crystals is critical for their applications in nanoelectronics, optoelectronics, and photonics. Here, we report a simple but rather unexpected approach for bandgap engineering of muscovite-type mica nanosheets (KAl3Si3O10(OH)(2)) via controlled molecular thickness. Through density functional calculations, we analyze electronic structures in 2D mica nanosheets and develop a general picture for tunable bandgap narrowing induced by controlled molecular thickness. From conducting atomic force microscopy, we observe an abnormal bandgap narrowing in 2D mica nanosheets, contrary to well-known quantum size effects. In mica nanosheets, decreasing the number of layers results in reduced bandgap energy from 7 to 2.5 eV, and the bilayer case exhibits a semiconducting nature with similar to 2.5 eV. Structural modeling by transmission electron microscopy and density functional calculations reveal that this bandgap narrowing can be defined as a consequence of lattice relaxations as well as surface doping effects. These bandgap engineered 2D mica nanosheets open up an exciting opportunity for new physical properties in 2D materials and may find diverse applications in 2D electronic/optoelectronic devices.
URI
http://pubs.acs.org/doi/abs/10.1021/cm504802jhttp://hdl.handle.net/20.500.11754/25638
ISSN
0897-4756; 1520-5002
DOI
10.1021/cm504802j
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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