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Title: Shape- and phase-controlled ZnS nanostructures and their optical properties

Graphical abstract: (a) TEM images of the nanorods, the HRTEM images for the lower (b) and the upper (c) part of the rod in (a). - Highlights: • Stacking faults were observed for ZnS nanocrystals with the size of ∼5 nm. • Nanotwinning structures and stacking faults were observed in ZnS nanorod. • Microstructure defects were found to be formed randomly for nanocrystals and nanorods. • The 1LO phonon mode exhibits a red-shift of 6 cm{sup −1} as the particle size increases from 5 to 15 nm. - Abstract: Single-crystalline ZnS nanoparticles with a zinc-blende crystal structure have some microdefects such as stacking faults and nanotwins. In contrast, ZnS nanorods have a wurtzite crystal structure, which grows along the [0 0 0 1] direction, although some nanorods display the intergrowth of a minor zinc-blende phase and the major wurtzite phase, which forms stacking faults or zinc-blende/wurtzite ZnS nanotwins. Raman spectroscopy measurements reveal surface phonons and longitudinal optical phonons in the nanoparticles, nanorods and doublet phonons that are associated with the transversal optical phonons of the A1 and E1 modes in only the nanorods. The first-order longitudinal optical phonon mode exhibits a blueshift of 6 cm{sup −1} when the particle sizemore » increases from 5 to 15 nm, but there is no shift in the range of 15–30 nm because of quantum confinement and microdefects.« less
Authors:
 [1] ;  [1] ;  [2] ; ; ;  [1]
  1. School of Physical Science and Technology and Institute of Optoelectronic Technology, Yangzhou University, Yangzhou 225002 (China)
  2. Nantong College, Jiangsu Open University, Nantong 226006, Jiangsu (China)
Publication Date:
OSTI Identifier:
22420601
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 59; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CUBIC LATTICES; MICROSTRUCTURE; MONOCRYSTALS; NANOPARTICLES; NANOSTRUCTURES; OPTICAL PROPERTIES; PARTICLE SIZE; PHONONS; RAMAN SPECTROSCOPY; RED SHIFT; STACKING FAULTS; SURFACE PROPERTIES; SURFACES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; ZINC SULFIDES