Izvorni znanstveni članak
Structure and Spatial Distribution of Ge Nanocrystals Subjected to Fast Neutron Irradiation
Shai Levy
; Jack and Pearl Redneck Institute of Advanced Technology, Bar-Ilan University, Israel
Issai Shlimak
; Jack and Pearl Redneck Institute of Advanced Technology, Bar-Ilan University, Israel
David H. Dressler
; Department of Chemistry, Bar Ilan University, Israel
Judith Grinblat
; Bar-Ilan Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Israel
Yossi Gofer
; Department of Chemistry, Bar Ilan University, Israel
Tiecheng Lu
; Department of Physics and Key Laboratory for Radiation Physics Technology of Ministry of Education, Sichuan University, P.R. China
Alexander N. Ionov
; A. F. Ioffe Physico-Technical Institute RAS, Russia
Sažetak
The influence of fast neutron irradiation on the
structure and spatial distribution of Ge nanocrystals (NC)
embedded in an amorphous SiO2 matrix has been
studied. The investigation was conducted by means of
laser Raman Scattering (RS), High Resolution
Transmission Electron Microscopy (HR-TEM) and X-ray
photoelectron spectroscopy (XPS). The irradiation of GeNC samples by a high dose of fast neutrons lead to a
partial destruction of the nanocrystals. Full reconstruction
of crystallinity was achieved after annealing the radiation
damage at 800
0
C, which resulted in full restoration of the
RS spectrum. HR-TEM images show, however, that the
spatial distributions of Ge-NC changed as a result of
irradiation and annealing. A sharp decrease in NC
distribution towards the SiO2 surface has been observed.
This was accompanied by XPS detection of Ge oxides and
elemental Ge within both the surface and subsurface
region
Ključne riječi
Ge nanocrystals; Neutron radiation effects; Structure and spatial distribution
Hrčak ID:
71557
URI
Datum izdavanja:
15.6.2011.
Posjeta: 1.165 *