Molecular environment of Ni after its use for removal of CMP nanoparticle

Y. L. Wei, K. W. Chen, Y. S. Peng, Hong-Paul Wang

Research output: Contribution to journalArticle

Abstract

X-ray absorption spectroscopy (XAS) is employed to investigate the molecular environment around nickel that, in the form of nickel sulfate solution, has been added to precipitate nanoparticles in chemical mechanical polishing (CMP) waste water. After phase separation, for the liquid-phase sample, both the white line intensity in the normalized Ni K-edge X-ray absorption near edge structure (XANES) spectrum and the amplitude of the extended X-ray absorption fine structure (EXAFS) spectrum are enhanced due to the presence of solvation of water molecules, as compared to the solid-phase sample. Meanwhile, with the presence of water molecules, the coordination number increases; yet the Debye-Waller factor slightly decreases. The lack of chemical reduction of Ni2+ in the CMP solution is suggested as the main reason why the charge neutralization precipitation method through the use of Ni2+ is less effective than the system using Cu2+ to precipitate nanoparticles as previously reported.

Original languageEnglish
Pages (from-to)105-107
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume619
Issue number1-3
DOIs
Publication statusPublished - 2010 Jul 1

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Chemical mechanical polishing
X ray absorption
polishing
Precipitates
Nickel sulfates
Nanoparticles
nanoparticles
X ray absorption spectroscopy
Molecules
precipitates
Solvation
nickel
Phase separation
Water
waste water
Wastewater
x rays
Nickel
coordination number
water

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

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title = "Molecular environment of Ni after its use for removal of CMP nanoparticle",
abstract = "X-ray absorption spectroscopy (XAS) is employed to investigate the molecular environment around nickel that, in the form of nickel sulfate solution, has been added to precipitate nanoparticles in chemical mechanical polishing (CMP) waste water. After phase separation, for the liquid-phase sample, both the white line intensity in the normalized Ni K-edge X-ray absorption near edge structure (XANES) spectrum and the amplitude of the extended X-ray absorption fine structure (EXAFS) spectrum are enhanced due to the presence of solvation of water molecules, as compared to the solid-phase sample. Meanwhile, with the presence of water molecules, the coordination number increases; yet the Debye-Waller factor slightly decreases. The lack of chemical reduction of Ni2+ in the CMP solution is suggested as the main reason why the charge neutralization precipitation method through the use of Ni2+ is less effective than the system using Cu2+ to precipitate nanoparticles as previously reported.",
author = "Wei, {Y. L.} and Chen, {K. W.} and Peng, {Y. S.} and Hong-Paul Wang",
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T1 - Molecular environment of Ni after its use for removal of CMP nanoparticle

AU - Wei, Y. L.

AU - Chen, K. W.

AU - Peng, Y. S.

AU - Wang, Hong-Paul

PY - 2010/7/1

Y1 - 2010/7/1

N2 - X-ray absorption spectroscopy (XAS) is employed to investigate the molecular environment around nickel that, in the form of nickel sulfate solution, has been added to precipitate nanoparticles in chemical mechanical polishing (CMP) waste water. After phase separation, for the liquid-phase sample, both the white line intensity in the normalized Ni K-edge X-ray absorption near edge structure (XANES) spectrum and the amplitude of the extended X-ray absorption fine structure (EXAFS) spectrum are enhanced due to the presence of solvation of water molecules, as compared to the solid-phase sample. Meanwhile, with the presence of water molecules, the coordination number increases; yet the Debye-Waller factor slightly decreases. The lack of chemical reduction of Ni2+ in the CMP solution is suggested as the main reason why the charge neutralization precipitation method through the use of Ni2+ is less effective than the system using Cu2+ to precipitate nanoparticles as previously reported.

AB - X-ray absorption spectroscopy (XAS) is employed to investigate the molecular environment around nickel that, in the form of nickel sulfate solution, has been added to precipitate nanoparticles in chemical mechanical polishing (CMP) waste water. After phase separation, for the liquid-phase sample, both the white line intensity in the normalized Ni K-edge X-ray absorption near edge structure (XANES) spectrum and the amplitude of the extended X-ray absorption fine structure (EXAFS) spectrum are enhanced due to the presence of solvation of water molecules, as compared to the solid-phase sample. Meanwhile, with the presence of water molecules, the coordination number increases; yet the Debye-Waller factor slightly decreases. The lack of chemical reduction of Ni2+ in the CMP solution is suggested as the main reason why the charge neutralization precipitation method through the use of Ni2+ is less effective than the system using Cu2+ to precipitate nanoparticles as previously reported.

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