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Synthesis of TlBr and Tl 2 AgBr 3 Nanocrystals
Author(s) -
Siegler Timothy D.,
Shah Tushti,
Houck Daniel W.,
Suri Mokshin,
Zhang Yangning,
Korgel Brian A.
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.202000100
Subject(s) - nanocrystal , thallium , oleylamine , materials science , band gap , crystal structure , silver bromide , nanoparticle , nanotechnology , crystallography , inorganic chemistry , chemistry , optoelectronics , metallurgy , layer (electronics) , silver halide
There are only a few examples of nanocrystal synthesis with thallium (Tl). Here, we report the synthesis of uniform, ligand‐stabilized colloidal nanocrystals of TlBr and Tl 2 AgBr 3 nanocrystals with average diameter ranging between 10 and 20 nm. TlBr nanocrystals are made by hot injection of trimethylsilyl bromide (TMSBr) into solutions of oleylamine, oleic acid and octadecene with thallium (III) or thallium (I) acetate. Tl 2 AgBr 3 nanocrystals form when silver (I) acetate is included in the reaction. The TlBr nanocrystals have CsCl crystal structure with a direct band gap of 3.1 eV. The Tl 2 AgBr 3 nanocrystals have trigonal dolomite crystal structure with an indirect band gap of 3.1 eV. The TlBr nanocrystals made with thallium (III) were sufficiently uniform to assemble into face‐centered cubic (fcc) superlattices.