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Title: A simple route for making surfactant free lead sulfide (PbS) quantum dots

Abstract

Highlights: • Surfactant free PbS NCs were successfully synthesised using CoSP technique. • The technique eliminates the requirements of washing to remove the ligands. • Grinding using mortar and pestle creates well separated PbS QDs. • Surfactant free PbS NCs are stable and do not show any degradation with time. - Abstract: An efficient, cost effective and less time consuming method suitable for mass production of surfactant free quantum dots (QDs) of lead sulfide (PbS) is reported. PbS nanocrystals (NCs) are first synthesised by continuous spray pyrolysis (CoSP) technique and de-agglomeration into PbS quantum dots (QDs) is achieved by vigorous mechanical grinding using mortar and pestle. Lead acetate and thiourea were used as the precursor materials for preparation of surfactant free PbS NCs. The broadening in XRD peaks of ground NCs as compared to as synthesized PbS NCs clearly indicated the reduction in particle size to be QDs of PbS. The TEM images also showed that ground PbS NCs were nearly spherical in shape having an average diameter in the range of 4–6 nm. The shift in optical gap from 0.41 eV to 1.47 eV supported the QD formation.

Authors:
; ;
Publication Date:
OSTI Identifier:
22475761
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 65; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; LEAD SULFIDES; MASS; MORTARS; OPTICAL PROPERTIES; PRECURSOR; PYROLYSIS; QUANTUM DOTS; REDUCTION; SEMICONDUCTOR MATERIALS; SPRAYS; SURFACTANTS; SYNTHESIS; THIOUREA; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Alam, Firoz, Kumar, Neetesh, and Dutta, Viresh, E-mail: vdutta@ces.iitd.ac.in. A simple route for making surfactant free lead sulfide (PbS) quantum dots. United States: N. p., 2015. Web. doi:10.1016/J.MATERRESBULL.2015.01.045.
Alam, Firoz, Kumar, Neetesh, & Dutta, Viresh, E-mail: vdutta@ces.iitd.ac.in. A simple route for making surfactant free lead sulfide (PbS) quantum dots. United States. doi:10.1016/J.MATERRESBULL.2015.01.045.
Alam, Firoz, Kumar, Neetesh, and Dutta, Viresh, E-mail: vdutta@ces.iitd.ac.in. Fri . "A simple route for making surfactant free lead sulfide (PbS) quantum dots". United States. doi:10.1016/J.MATERRESBULL.2015.01.045.
@article{osti_22475761,
title = {A simple route for making surfactant free lead sulfide (PbS) quantum dots},
author = {Alam, Firoz and Kumar, Neetesh and Dutta, Viresh, E-mail: vdutta@ces.iitd.ac.in},
abstractNote = {Highlights: • Surfactant free PbS NCs were successfully synthesised using CoSP technique. • The technique eliminates the requirements of washing to remove the ligands. • Grinding using mortar and pestle creates well separated PbS QDs. • Surfactant free PbS NCs are stable and do not show any degradation with time. - Abstract: An efficient, cost effective and less time consuming method suitable for mass production of surfactant free quantum dots (QDs) of lead sulfide (PbS) is reported. PbS nanocrystals (NCs) are first synthesised by continuous spray pyrolysis (CoSP) technique and de-agglomeration into PbS quantum dots (QDs) is achieved by vigorous mechanical grinding using mortar and pestle. Lead acetate and thiourea were used as the precursor materials for preparation of surfactant free PbS NCs. The broadening in XRD peaks of ground NCs as compared to as synthesized PbS NCs clearly indicated the reduction in particle size to be QDs of PbS. The TEM images also showed that ground PbS NCs were nearly spherical in shape having an average diameter in the range of 4–6 nm. The shift in optical gap from 0.41 eV to 1.47 eV supported the QD formation.},
doi = {10.1016/J.MATERRESBULL.2015.01.045},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 65,
place = {United States},
year = {2015},
month = {5}
}