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- Title
Size-dependent evolution of phonon confinement in colloidal Si nanoparticles.
- Authors
Zhang, Pengfei; Feng, Yu; Anthony, Rebecca; Kortshagen, Uwe; Conibeer, Gavin; Huang, Shujuan
- Abstract
A size-dependent evolution of phonon confinement is revealed in Si nanoparticles (NPs) via Raman spectroscopy. By introducing a variable confinement factor, α, into a well-known phenomenological phonon confinement model (PCM) developed by Richter et al., acceptable fits are achieved to downshifted and asymmetrically broadened Raman spectra of Si NPs with different diameters, d, from 2.4nm to 6.3 nm. A comparative study using Raman spectra of colloidal Si NPs, for the first time, shows an apparent positive linear correlation between α and the Si NP size. Based on the PCM, the amplitude of the atomic vibration (phonon) at the real physical boundary of NPs is proportional to e-α/2, which indicates that the amplitude of the first order optical phonon is relatively larger at the edges for smaller Si nanostructures despite of their stronger phonon confinement weighed by α/d2.
- Subjects
PHONONS; RAMAN spectroscopy; SILICON compounds; NANOSTRUCTURES; RAMAN spectra
- Publication
Journal of Raman Spectroscopy, 2015, Vol 46, Issue 11, p1110
- ISSN
0377-0486
- Publication type
Article
- DOI
10.1002/jrs.4727