Simonkolleite nano-platelets: Synthesis and temperature effect on hydrogen gas sensing properties

被引:89
作者
Sithole, J. [1 ,2 ]
Ngom, B. D. [1 ,3 ,4 ]
Khamlich, S. [1 ,3 ]
Manikanadan, E. [5 ]
Manyala, N. [6 ]
Saboungi, M. L. [7 ]
Knoessen, D. [2 ]
Nemutudi, R. [1 ]
Maaza, M. [1 ]
机构
[1] Natl Res Fdn, MRD iThemba LABS, NANOAFNET, ZA-7129 Somerset W, South Africa
[2] Univ Western Cape, Dept Phys, Bellville, South Africa
[3] African Laser Ctr, Pretoria, South Africa
[4] Univ Cheikh Anta Diop Dakar, Fac Sci & Tech, Lab Photon & Nanofabricat, Grp Phys Solide & Sci Mat,Dept Phys, Dakar, Senegal
[5] CSIR, NCNSM, ZA-0001 Pretoria, South Africa
[6] Univ Pretoria, Inst Appl Mat, Dept Phys, SARCHI Chair Carbon Technol & Mat, ZA-0028 Pretoria, South Africa
[7] CNRS, Ctr Rech Matiere Divisee, F-45071 Orleans, France
基金
新加坡国家研究基金会;
关键词
Nano-particles; Zinc oxide; Simonkolleite; Hydrothermal; Photonics and gas sensing; ROOM-TEMPERATURE; ZNO NANORODS; SENSITIVITY; SENSORS; FILMS;
D O I
10.1016/j.apsusc.2012.04.073
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, the new refined mineral platelets-like morphology of simonkolleite based particles described by Shemetzer et al. (1985) were synthesized in zinc nitrate aqueous solution by a moderate solution process. The morphological and structural properties of the platelets-like Zn-5(OH)(8)Cl-2 center dot H2O were characterized by scanning electron microscope energy dispersed X-ray spectroscopy, transmission electron microscope, powder X-ray diffraction and selected area electron diffraction as well as attenuated total reflection infrared spectroscopy. The morphology as well as the size in both basal and transversal directions of the simonkolleite Zn-5(OH)(8)Cl-2 center dot H2O nano/micro crystals was found to be significantly depending on the specific concentration of 0.1 M of Zn2+/Cl- ions in the precursor solution. The simonkolleite Zn-5(OH)(8)Cl-2 center dot H2O nano-platelets revealed a significant and singular H-2 gas sensing characteristics. The operating temperature was found to play a key role on the sensing properties of simonkolleite. The effect of temperature on the simonkolleite sample as a hydrogen gas sensor was studied by recording the change in resistivity of the film in presence of the test gas. The results on the sensitivity and response time as per comparison to earlier reported ZnO based sensors are indicated and discussed. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:7839 / 7843
页数:5
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