A facile synthesis method for Ni(OH)2 ultrathin nanosheets and their conversion to porous NiO nanosheets used for formaldehyde sensing

Guanghui Li; Xuewen Wang; Haiyan Ding; Ting Zhang

doi:10.1039/c2ra22049k

A facile synthesis method for Ni(OH)₂ ultrathin nanosheets and their conversion to porous NiO nanosheets used for formaldehyde sensing

Guanghui Li, Xuewen Wang, Haiyan Ding, Ting Zhang

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

78 Scopus citations

Abstract

Single-crystalline β-Ni(OH)₂ ultrathin nanosheets were synthesized via a simple electrochemical reaction of Ni electrodes with a mixed solution of NaCl, NaOH, and NH₄Cl at room temperature. The average thickness of β-Ni(OH)₂ nanosheets is in the range 1-15 nm, which can be readily tuned by changing the concentration of NaCl. The phase structure, composition, morphology, and thickness of Ni(OH)₂ nanosheets were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The mechanism of the nanosheet formation is proposed as the selective adsorption of NH₃ molecules on the (001) crystal face of β-Ni(OH)₂ which suppresses growth in the [001] direction. Porous NiO ultrathin nanosheets were obtained by thermal decomposition of β-Ni(OH)₂ nanosheets in air at 400 °C for 2 h. Gas sensing properties of NiO ultrathin nanosheets were investigated, and the sensors exhibited high sensitivity, low detection limit, and wide dynamic range for detection of formaldehyde.

Original language	English
Pages (from-to)	13018-13023
Number of pages	6
Journal	RSC Advances
Volume	2
Issue number	33
DOIs	https://doi.org/10.1039/c2ra22049k
State	Published - 21 Dec 2012
Externally published	Yes

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title = "A facile synthesis method for Ni(OH)2 ultrathin nanosheets and their conversion to porous NiO nanosheets used for formaldehyde sensing",

abstract = "Single-crystalline β-Ni(OH)2 ultrathin nanosheets were synthesized via a simple electrochemical reaction of Ni electrodes with a mixed solution of NaCl, NaOH, and NH4Cl at room temperature. The average thickness of β-Ni(OH)2 nanosheets is in the range 1-15 nm, which can be readily tuned by changing the concentration of NaCl. The phase structure, composition, morphology, and thickness of Ni(OH)2 nanosheets were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The mechanism of the nanosheet formation is proposed as the selective adsorption of NH3 molecules on the (001) crystal face of β-Ni(OH)2 which suppresses growth in the [001] direction. Porous NiO ultrathin nanosheets were obtained by thermal decomposition of β-Ni(OH)2 nanosheets in air at 400 °C for 2 h. Gas sensing properties of NiO ultrathin nanosheets were investigated, and the sensors exhibited high sensitivity, low detection limit, and wide dynamic range for detection of formaldehyde.",

author = "Guanghui Li and Xuewen Wang and Haiyan Ding and Ting Zhang",

year = "2012",

month = dec,

day = "21",

doi = "10.1039/c2ra22049k",

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T1 - A facile synthesis method for Ni(OH)2 ultrathin nanosheets and their conversion to porous NiO nanosheets used for formaldehyde sensing

AU - Li, Guanghui

AU - Wang, Xuewen

AU - Ding, Haiyan

AU - Zhang, Ting

PY - 2012/12/21

Y1 - 2012/12/21

N2 - Single-crystalline β-Ni(OH)2 ultrathin nanosheets were synthesized via a simple electrochemical reaction of Ni electrodes with a mixed solution of NaCl, NaOH, and NH4Cl at room temperature. The average thickness of β-Ni(OH)2 nanosheets is in the range 1-15 nm, which can be readily tuned by changing the concentration of NaCl. The phase structure, composition, morphology, and thickness of Ni(OH)2 nanosheets were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The mechanism of the nanosheet formation is proposed as the selective adsorption of NH3 molecules on the (001) crystal face of β-Ni(OH)2 which suppresses growth in the [001] direction. Porous NiO ultrathin nanosheets were obtained by thermal decomposition of β-Ni(OH)2 nanosheets in air at 400 °C for 2 h. Gas sensing properties of NiO ultrathin nanosheets were investigated, and the sensors exhibited high sensitivity, low detection limit, and wide dynamic range for detection of formaldehyde.

AB - Single-crystalline β-Ni(OH)2 ultrathin nanosheets were synthesized via a simple electrochemical reaction of Ni electrodes with a mixed solution of NaCl, NaOH, and NH4Cl at room temperature. The average thickness of β-Ni(OH)2 nanosheets is in the range 1-15 nm, which can be readily tuned by changing the concentration of NaCl. The phase structure, composition, morphology, and thickness of Ni(OH)2 nanosheets were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The mechanism of the nanosheet formation is proposed as the selective adsorption of NH3 molecules on the (001) crystal face of β-Ni(OH)2 which suppresses growth in the [001] direction. Porous NiO ultrathin nanosheets were obtained by thermal decomposition of β-Ni(OH)2 nanosheets in air at 400 °C for 2 h. Gas sensing properties of NiO ultrathin nanosheets were investigated, and the sensors exhibited high sensitivity, low detection limit, and wide dynamic range for detection of formaldehyde.

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U2 - 10.1039/c2ra22049k

DO - 10.1039/c2ra22049k

M3 - 文章

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SN - 2046-2069

VL - 2

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EP - 13023

JO - RSC Advances

JF - RSC Advances

IS - 33

ER -

A facile synthesis method for Ni(OH)₂ ultrathin nanosheets and their conversion to porous NiO nanosheets used for formaldehyde sensing

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