Electron-Beam Induced Water Removal, Phase Change, and Crystallization of Anodic-Electrodeposited Turbostratic Nickel Hydroxide-Oxyhydroxide

Kin Wa Kwan; Degang Xie; Rongrong Zhang; Zhiwei Shan; Alfonso H.W. Ngan

doi:10.1002/pssa.201800623

Electron-Beam Induced Water Removal, Phase Change, and Crystallization of Anodic-Electrodeposited Turbostratic Nickel Hydroxide-Oxyhydroxide

Kin Wa Kwan
, Degang Xie
, Rongrong Zhang
, Zhiwei Shan
, Alfonso H.W. Ngan

School of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Water removal, phase transformation, and crystallization of turbostratic nickel hydroxide and oxyhydroxide (Ni(OH)₂-NiOOH) are found to be inducible by the electron beam of a transmission electron microscope (TEM). Under 30 s of beam exposure at an accelerating voltage of 200 keV and a beam current density of 500 mA m⁻², the original, characteristic turbostratic structure of Ni(OH)₂-NiOOH is observed to disappear, caused by the quick removal of intercalated water molecules by the electron beam. Increasing the current density from a low value of 1.5 mA m⁻² to a high value of 500 mA m⁻² can transform the Ni(OH)₂-NiOOH into nickel oxide (NiO) in 1 min. In situ heating and preheating experiments suggest that the transformation is caused by a heating effect induced by the electron beam. The results confirm that the mechanism previously discovered light-induced actuation of Ni(OH)₂-NiOOH is caused by desorption of water molecules.

Original language	English
Article number	1800623
Journal	Physica Status Solidi (A) Applications and Materials Science
Volume	215
Issue number	23
DOIs	https://doi.org/10.1002/pssa.201800623
State	Published - 6 Dec 2018

Keywords

in situ transmission electron microscopy (TEM)
nickel hydroxide-oxyhydroxide
phase transformation
turbostratic structures

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10.1002/pssa.201800623

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@article{385344ab09e54836a955adf3972e3f86,

title = "Electron-Beam Induced Water Removal, Phase Change, and Crystallization of Anodic-Electrodeposited Turbostratic Nickel Hydroxide-Oxyhydroxide",

abstract = "Water removal, phase transformation, and crystallization of turbostratic nickel hydroxide and oxyhydroxide (Ni(OH)2-NiOOH) are found to be inducible by the electron beam of a transmission electron microscope (TEM). Under 30 s of beam exposure at an accelerating voltage of 200 keV and a beam current density of 500 mA m−2, the original, characteristic turbostratic structure of Ni(OH)2-NiOOH is observed to disappear, caused by the quick removal of intercalated water molecules by the electron beam. Increasing the current density from a low value of 1.5 mA m−2 to a high value of 500 mA m−2 can transform the Ni(OH)2-NiOOH into nickel oxide (NiO) in 1 min. In situ heating and preheating experiments suggest that the transformation is caused by a heating effect induced by the electron beam. The results confirm that the mechanism previously discovered light-induced actuation of Ni(OH)2-NiOOH is caused by desorption of water molecules.",

keywords = "in situ transmission electron microscopy (TEM), nickel hydroxide-oxyhydroxide, phase transformation, turbostratic structures",

author = "Kwan, \{Kin Wa\} and Degang Xie and Rongrong Zhang and Zhiwei Shan and Ngan, \{Alfonso H.W.\}",

note = "Publisher Copyright: {\textcopyright} 2018 WILEY-VCH Verlag GmbH \& Co. KGaA, Weinheim",

year = "2018",

month = dec,

day = "6",

doi = "10.1002/pssa.201800623",

language = "英语",

volume = "215",

journal = "Physica Status Solidi (A) Applications and Materials Science",

issn = "1862-6300",

publisher = "Wiley-VCH Verlag",

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TY - JOUR

T1 - Electron-Beam Induced Water Removal, Phase Change, and Crystallization of Anodic-Electrodeposited Turbostratic Nickel Hydroxide-Oxyhydroxide

AU - Kwan, Kin Wa

AU - Xie, Degang

AU - Zhang, Rongrong

AU - Shan, Zhiwei

AU - Ngan, Alfonso H.W.

PY - 2018/12/6

Y1 - 2018/12/6

N2 - Water removal, phase transformation, and crystallization of turbostratic nickel hydroxide and oxyhydroxide (Ni(OH)2-NiOOH) are found to be inducible by the electron beam of a transmission electron microscope (TEM). Under 30 s of beam exposure at an accelerating voltage of 200 keV and a beam current density of 500 mA m−2, the original, characteristic turbostratic structure of Ni(OH)2-NiOOH is observed to disappear, caused by the quick removal of intercalated water molecules by the electron beam. Increasing the current density from a low value of 1.5 mA m−2 to a high value of 500 mA m−2 can transform the Ni(OH)2-NiOOH into nickel oxide (NiO) in 1 min. In situ heating and preheating experiments suggest that the transformation is caused by a heating effect induced by the electron beam. The results confirm that the mechanism previously discovered light-induced actuation of Ni(OH)2-NiOOH is caused by desorption of water molecules.

AB - Water removal, phase transformation, and crystallization of turbostratic nickel hydroxide and oxyhydroxide (Ni(OH)2-NiOOH) are found to be inducible by the electron beam of a transmission electron microscope (TEM). Under 30 s of beam exposure at an accelerating voltage of 200 keV and a beam current density of 500 mA m−2, the original, characteristic turbostratic structure of Ni(OH)2-NiOOH is observed to disappear, caused by the quick removal of intercalated water molecules by the electron beam. Increasing the current density from a low value of 1.5 mA m−2 to a high value of 500 mA m−2 can transform the Ni(OH)2-NiOOH into nickel oxide (NiO) in 1 min. In situ heating and preheating experiments suggest that the transformation is caused by a heating effect induced by the electron beam. The results confirm that the mechanism previously discovered light-induced actuation of Ni(OH)2-NiOOH is caused by desorption of water molecules.

KW - in situ transmission electron microscopy (TEM)

KW - nickel hydroxide-oxyhydroxide

KW - phase transformation

KW - turbostratic structures

UR - https://www.scopus.com/pages/publications/85054505043

U2 - 10.1002/pssa.201800623

DO - 10.1002/pssa.201800623

M3 - 文章

AN - SCOPUS:85054505043

SN - 1862-6300

VL - 215

JO - Physica Status Solidi (A) Applications and Materials Science

JF - Physica Status Solidi (A) Applications and Materials Science

IS - 23

M1 - 1800623

ER -

Electron-Beam Induced Water Removal, Phase Change, and Crystallization of Anodic-Electrodeposited Turbostratic Nickel Hydroxide-Oxyhydroxide

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