Luminescence properties of ultrasmall amorphous Si nanoparticles with sizes smaller than 2 nm

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

10 Scopus Citations
View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)476-480
Journal / PublicationJournal of Crystal Growth
Volume304
Issue number2
Publication statusPublished - 15 Jun 2007

Abstract

Using electrochemical etching of amorphous Si films deposited on metal molybdenum and subsequent ultrasonic treatment in water and chloroform solutions, we have fabricated the suspensions of amorphous Si nanoparticles with a size range of 1-3 nm (the probable size is at 1.7 nm with a Gaussian fitting), which are uniformly dispersed in the solvents. We examined the photoluminescence (PL) spectra of the two kinds of suspensions and found that for the chloroform suspension, the PL spectrum lasts to blueshift as the excitation wavelength decreases. For the water suspension, the PL spectrum initially shows blueshift with decreasing excitation wavelength and then remains unchanged in peak position when the excitation wavelength is below 320 nm. We attribute this difference to different surface bonding structures of amorphous Si nanoparticles, induced by the solvents. This work indicates that the surface structure has a large influence on the PL properties of Si nanoparticles with sizes smaller than 2 nm. © 2007 Elsevier B.V. All rights reserved.

Research Area(s)

  • A1. Luminescence properties, B1. Amorphous Si, B1. Nanoparticles

Citation Format(s)

Luminescence properties of ultrasmall amorphous Si nanoparticles with sizes smaller than 2 nm. / Xie, Y.; Wu, X. L.; Qiu, T. et al.
In: Journal of Crystal Growth, Vol. 304, No. 2, 15.06.2007, p. 476-480.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review