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Environmentally Friendly Processing Technology for Engineering Silicon Nanocrystals in Water with Laser Pulses

Svrcek, V., Mariotti, D, Cvelbar, U., Filipic, G., Lozac'h, M., McDonald, C., Tayagaki, T. and Matsubara, K. (2016) Environmentally Friendly Processing Technology for Engineering Silicon Nanocrystals in Water with Laser Pulses. The Journal of Physical Chemistry C, 120 (33). pp. 18822-18830. [Journal article]

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URL: http://dx.doi.org/10.1021/acs.jpcc.6b04405

DOI: 10.1021/acs.jpcc.6b04405

Abstract

Herein, we demonstrate the customized, environmentally friendly tailoring of nanoparticles and their surface chemistry by short pulsed laser irradiation in liquids. This process allows for the formation of crystalline spherical particles exceeding several hundreds of nanometers in water from colloids of electrochemically etched silicon nanocrystals (Si-NCs), which exhibit quantum confinement effects and room-temperature stable luminescence. In particular, nanosecond (ns) pulsed laser irradiation of the Si-NC/water colloids causes the selective heating of the Si-NCs accompanied by the formation of spherical particles. In contrast, femtosecond (fs) laser pulsed irradiation induces the formation of colloidal Si-NCs with peculiar surface chemistry; in particular, fs pulses generate short-lived plasmas with more ionized species in water, which enable the surface engineering of quantum confined Si-NCs, thus limiting Si-NC agglomeration and enhancing their photoluminescent properties.

Item Type:Journal article
Keywords:Silicon nanocrystals
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:35815
Deposited By: Professor Davide Mariotti
Deposited On:08 Sep 2016 08:27
Last Modified:17 Oct 2017 16:25

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