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Ultra-small photoluminescent silicon-carbide nanocrystals by atmospheric-pressure plasmas
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering. University of Ulster, North Ireland.
University of Ulster, North Ireland.
University of Ulster, North Ireland.
Queensland University of Technology, Australia.
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2016 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 8, no 39, 17141-17149 p.Article in journal (Refereed) Published
Abstract [en]

Highly size-controllable synthesis of free-standing perfectly crystalline silicon carbide nanocrystals has been achieved for the first time through a plasma-based bottom-up process. This low-cost, scalable, ligand-free atmospheric pressure technique allows fabrication of ultra-small (down to 1.5 nm) nanocrystals with very low level of surface contamination, leading to fundamental insights into optical properties of the nanocrystals. This is also confirmed by their exceptional photoluminescence emission yield enhanced by more than 5 times by reducing the nanocrystals sizes in the range of 1-5 nm, which is attributed to quantum confinement in ultra-small nanocrystals. This method is potentially scalable and readily extendable to a wide range of other classes of materials. Moreover, this ligand-free process can produce colloidal nanocrystals by direct deposition into liquid, onto biological materials or onto the substrate of choice to form nanocrystal films. Our simple but efficient approach based on non-equilibrium plasma environment is a response to the need of most efficient bottom-up processes in nanosynthesis and nanotechnology.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2016. Vol. 8, no 39, 17141-17149 p.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-132700DOI: 10.1039/c6nr03702jISI: 000386074900011PubMedID: 27722686OAI: oai:DiVA.org:liu-132700DiVA: diva2:1048095
Note

Funding Agencies|Royal Society International Exchange Scheme [IE120884]; Leverhulme International Network [IN-2012-136]; EPSRC [EP/K022237/1, EP/M024938/1]; EU-FP7 [606889]; University of Ulster Vice-Chancellor Studentship; EU [606889]; CSIRO; Australian Research Council; School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology

Available from: 2016-11-20 Created: 2016-11-18 Last updated: 2016-12-07

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Askari Ghotbabadi, Sadegh
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Plasma and Coating PhysicsFaculty of Science & Engineering
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