A Bottom-Up Approach toward Fabrication of Ultrathin PbS Sheets

Acharya, Somobrata and Das, Bidisa and Thupakula, Umamahesh and Ariga, Katsuhiko and Sarma, DD and Israelachvili, Jacob and Golan, Yuval (2013) A Bottom-Up Approach toward Fabrication of Ultrathin PbS Sheets. In: NANO LETTERS, 13 (2). pp. 409-415.

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Abstract

Two-dimensional (2D) sheets are currently in the spotlight of nanotechnology owing to high-performance device fabrication possibilities. Building a free-standing quantum sheet with controlled morphology is challenging when large planar geometry and ultranarrow thickness are simultaneously concerned. Coalescence of nanowires into large single-crystalline sheet is a promising approach leading to large, molecularly thick 2D sheets with controlled planar morphology. Here we report on a bottom-up approach to fabricate high-quality ultrathin 2D single crystalline sheets with well-defined rectangular morphology via collective coalescence of PbS nanowires. The ultrathin sheets are strictly rectangular with 1.8 nm thickness, 200-250 nm width, and 3-20 mu m length. The sheets show high electrical conductivity at room and cryogenic temperatures upon device fabrication. Density functional theory (DFT) calculations reveal that a single row of delocalized orbitals of a nanowire is gradually converted into several parallel conduction channels upon sheet formation, which enable superior in-plane carrier conduction.

Item Type:	Journal Article
Publication:	NANO LETTERS
Publisher:	AMER CHEMICAL SOC
Additional Information:	Copyright for this article belongs to AMER CHEMICAL SOC, WASHINGTON,
Keywords:	Nanowires;ultrathin sheet;coalescence;activation energy;DFT calculations;transport
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	25 Mar 2013 10:22
Last Modified:	25 Mar 2013 10:22
URI:	http://eprints.iisc.ac.in/id/eprint/46170

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