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Fabrication and luminescence of ZnS : Mn2+ nanoflowers

Chen, W; Bovin, Jan-Olov LU ; Wang, S P; Joly, AG; Wang, Y Q and Sherwood, P M A (2005) In Journal of Nanoscience and Nanotechnology 5(9). p.1309-1322
Abstract
Visually striking nanoflowers composed of ZnS:Mn2+ nanoparticles are prepared and characterized. The configurations of these fractal structures are very sensitive to both the pH values of the particle solutions from which they are precipitated and the substrates on which they are deposited. At pH 2.2, the fractal structures resemble trees without leaves; at pH 7.7, they are tree-like with four arms and at pH 11.0 they resemble trees with six arms. High resolution transmission microscopy reveals that the nanoflowers are composed of ZnS:Mn2+ nanoparticles of 2-5 nm in size. X-ray photoelectron spectral data indicate that the sample compositions of nitrogen, chlorine, and sulfur vary gradually with pH values of the solutions. These changes... (More)
Visually striking nanoflowers composed of ZnS:Mn2+ nanoparticles are prepared and characterized. The configurations of these fractal structures are very sensitive to both the pH values of the particle solutions from which they are precipitated and the substrates on which they are deposited. At pH 2.2, the fractal structures resemble trees without leaves; at pH 7.7, they are tree-like with four arms and at pH 11.0 they resemble trees with six arms. High resolution transmission microscopy reveals that the nanoflowers are composed of ZnS:Mn2+ nanoparticles of 2-5 nm in size. X-ray photoelectron spectral data indicate that the sample compositions of nitrogen, chlorine, and sulfur vary gradually with pH values of the solutions. These changes may have an impact on both the fractal configuration and the luminescence properties. The emission spectra of the particle solutions at pH values of 2.2 and 11.0 are similar with the emission maximum at 475 nm. As the pH value approaches 7.7, the emission spectral maximum shifts to longer wavelengths. At a pH value of 7.7, the emission peak wavelength is the reddest, 520 nm. The emission peak of the nanoflowers at a pH value of 9.3 is 510 nm, while the emission spectrum of the nanoflowers at 5.2 has two peaks at 500 nm and 440 nm, respectively. These blue-green emissions are attributed to defects and are the dominant luminescence from the nanoflowers. The emission from Mn2+ dopant is only observed in the delayed spectra of the fractal solid samples. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Nanoscience and Nanotechnology
volume
5
issue
9
pages
1309 - 1322
publisher
American Scientific Publishers
external identifiers
  • wos:000231292400002
  • pmid:16193948
  • scopus:27744514312
ISSN
1533-4880
DOI
10.1166/jnn.2005.302
language
English
LU publication?
yes
id
d8467247-def7-49bc-8bc9-b102b2b6a117 (old id 152181)
date added to LUP
2007-07-13 08:49:49
date last changed
2017-10-22 03:34:07
@article{d8467247-def7-49bc-8bc9-b102b2b6a117,
  abstract     = {Visually striking nanoflowers composed of ZnS:Mn2+ nanoparticles are prepared and characterized. The configurations of these fractal structures are very sensitive to both the pH values of the particle solutions from which they are precipitated and the substrates on which they are deposited. At pH 2.2, the fractal structures resemble trees without leaves; at pH 7.7, they are tree-like with four arms and at pH 11.0 they resemble trees with six arms. High resolution transmission microscopy reveals that the nanoflowers are composed of ZnS:Mn2+ nanoparticles of 2-5 nm in size. X-ray photoelectron spectral data indicate that the sample compositions of nitrogen, chlorine, and sulfur vary gradually with pH values of the solutions. These changes may have an impact on both the fractal configuration and the luminescence properties. The emission spectra of the particle solutions at pH values of 2.2 and 11.0 are similar with the emission maximum at 475 nm. As the pH value approaches 7.7, the emission spectral maximum shifts to longer wavelengths. At a pH value of 7.7, the emission peak wavelength is the reddest, 520 nm. The emission peak of the nanoflowers at a pH value of 9.3 is 510 nm, while the emission spectrum of the nanoflowers at 5.2 has two peaks at 500 nm and 440 nm, respectively. These blue-green emissions are attributed to defects and are the dominant luminescence from the nanoflowers. The emission from Mn2+ dopant is only observed in the delayed spectra of the fractal solid samples.},
  author       = {Chen, W and Bovin, Jan-Olov and Wang, S P and Joly, AG and Wang, Y Q and Sherwood, P M A},
  issn         = {1533-4880},
  language     = {eng},
  number       = {9},
  pages        = {1309--1322},
  publisher    = {American Scientific Publishers},
  series       = {Journal of Nanoscience and Nanotechnology},
  title        = {Fabrication and luminescence of ZnS : Mn2+ nanoflowers},
  url          = {http://dx.doi.org/10.1166/jnn.2005.302},
  volume       = {5},
  year         = {2005},
}