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Author Alam, Firoz ♦ Kumar, Neetesh ♦ Dutta, Viresh
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword 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
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.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-05-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 65


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