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Controlling the Lateral Size and Excitonic Properties of Colloidal PbS Nanosheets
Author(s) -
Premathilaka Shashini M.,
Tang Yiteng,
Jiang Zhoufeng,
MDS Weeraddana Tharaka,
Debnath Antu Antara,
Bischoff Seth,
Sun Liangfeng
Publication year - 2020
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201900656
Subject(s) - laser linewidth , nanosheet , materials science , colloid , absorption (acoustics) , exciton , nanoparticle , molecule , nanotechnology , photoluminescence , chemical engineering , optoelectronics , optics , chemistry , condensed matter physics , laser , composite material , organic chemistry , physics , engineering
Abstract By changing the precursor lead‐to‐sulfur molar ratio in the synthesis of colloidal PbS nanosheets, the lateral size of the nanosheet can be tuned in a wide range from 100 nm to 1500 nm while keeping its thickness around 2.4 nm. Using chloroalkane molecules with a long carbon‐chain as the capping ligands can further reduce the lateral size down to 20 nm. The concentration of the chloroalkane in the reaction solution and the reaction temperature also have significant effects on the lateral size. At room temperature, nanosheets with a small lateral size exhibit a narrow light‐emission linewidth. The same nanosheets also show a sharp exciton peak near the band edge in the optical absorption spectrum.