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Synthesis and Growth Mechanism of Stable Prenucleated (approximate to 0.8 nm Diameter) PbS Quantum Dots by Medium Energy Ion Scattering Spectroscopy

Title
Synthesis and Growth Mechanism of Stable Prenucleated (approximate to 0.8 nm Diameter) PbS Quantum Dots by Medium Energy Ion Scattering Spectroscopy
Authors
Park, Young HoPark, Seung MinJung, Kang-WonHwang, YunjuSorcar, SauravMoon, DaeWonIn, Su-Il
DGIST Authors
In, Su-Il
Issue Date
2019-04
Citation
Materials, 12(7)
Type
Article
Article Type
Article
Author Keyword
PbS quantum dots; medium energy ion scattering (MEIS); non-classical nucleation theory; nucleation and growth; sub-nanometer
Keyword
SILVER NANOCLUSTERS; ORIENTED ATTACHMENT; CRYSTAL-GROWTH; SOLAR-CELLS; SIZE; NANOCRYSTALS; NUCLEATION; RESOLUTION; NANOWIRES; CLUSTERS
ISSN
1996-1944
Abstract
In the current work, stable prenucleated PbS quantum dots (QDs) with a sub-nanometer (0.8 nm) size have been successfully synthesized via a systematically designed experiment. A detailed analysis of critical nucleation, growth, and stability for such ultrasmall prenucleated clusters is done. The experimental strategy is based on controlled concentration, temperature and injection of respective precursors, thus enabling us to control nucleation rate and separation of stable sub-nanometer PbS QDs with size 0.8 nm. Significantly, by providing additional thermal energy to sub-nanometer PbS QDs, we achieved the fully nucleated cubic crystalline structure of PbS with size of around 1.5 nm. The size and composition of the prenucleated QDs are investigated by sophisticated tools like X-ray photoelectron spectroscopy (XPS) and medium energy ion scattering (MEIS) spectroscopy which confirms the synthesis of PbS with Pb 2+ rich surface while the UV-Vis spectroscopy and X-ray diffraction (XRD) data suggests an alternative crystallization path. Non-classical nucleation theory is employed to substantiate the growth mechanism of prenucleated PbS QDs. © 2019 by the authors.
URI
http://hdl.handle.net/20.500.11750/9828
DOI
10.3390/ma12071109
Publisher
MDPI
Related Researcher
  • Author In, Su-Il Green and Renewable Energy for Endless Nature(GREEN) Lab
  • Research Interests CO2 conversion to hydrocarbon fuels; Water splitting for hydrogen generation; Quantum dot devices; Dye sensitized solar cells; Environmental remediation; Synthesis of functional nanomaterials; CO2 연료전환; 수소생산을 위한 광전기화학적 물분해; 양자점 태양전지; 염료감응 태양전지; 공해물질 저감연구; 기능성 나노소재 개발
Files:
Collection:
Department of Energy Science and EngineeringGreen and Renewable Energy for Endless Nature(GREEN) Lab1. Journal Articles


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