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

V. Svrcek, D Mariotti, U. Cvelbar, G. Filipic, M. Lozac'h, C. McDonald, T. Tayagaki, K. Matsubara

Research output: Contribution to journalArticle

9 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)18822-18830
JournalJournal Of Physical Chemistry C
Volume120
Issue number33
DOIs
Publication statusE-pub ahead of print - 4 Aug 2016

Keywords

  • Silicon nanocrystals

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