Ultrathin Colloidal PbS/CdS Core/Shell Nanosheets. (2nd May 2017)

• Record Type: Journal Article
• Authors: Khan, Simeen; Jiang, Zhoufeng; Premathilka, Shashini M; Hu, Jianjun; Voevodin, Andrey; Roland, Paul J.; Ellingson, Randy J.; Sun, Liangfeng
• Is Part Of: MRS advances. Volume 2:Number 60(2017)
• Page Start: 3685
• Page End: 3690
• Publication Date: 2017-05-02
• Subjects: nanostructure, -- core/shell, -- optoelectronic; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/adv.2017.327
• Languages: English
• ISSNs: 2059-8521

Abstract

ABSTRACT: Emissive PbS/CdS core/shell nanosheets are synthesized using a cation-exchange method. A significant blue-shift of the photoluminescence is observed, indicating a stronger quantum confinement in the PbS core as its thickness is reduced to eight atomic layers. High resolution transmission-electron-microscopy images of the cross-sections of the core/shell nanosheets show atomically sharp interfaces between PbS and CdS. Accurate analysis of the thickness of each layer reveals the relationship between the energy-gap and the thickness in the extremely one-dimensionally confined nanostructure.