Universität zu Köln

Song, Xuefeng, Gao, Lian and Mathur, Sanjay (2011). Synthesis, Characterization, and Gas Sensing Properties of Porous Nickel Oxide Nanotubes. J. Phys. Chem. C, 115 (44). S. 21730 - 21736. WASHINGTON: AMER CHEMICAL SOC. ISSN 1932-7455

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Abstract

A novel approach was employed to synthesize porous; NiO nanotubes with controllable interior voids based on an effective interplay of Kirkendall effect and volume change upon phase transformation. For this purpose, nickel nanowires were chemically converted into Ni3S2/Ni core-shell structures, followed by a controlled oxidation, whereby the associated volume change (Ni -> NiO conversion) resulted in 1D porous structure With voids. The voids between the Ni core and Ni3S2 shell could be controlled by adjusting the oxidation conditions that enabled fabrication of hollow and double-walled morphologies. Phase composition, morphological evolution, and porosity of double walled NiO nanotubes, were analyzed by X-ray diffraction, scanning and transmission electron microscopy, and N-2 adsorption-desorption studies: Gaseous Sulfur oxides formed during the oxidation of Ni3S2/Ni structures resulted in a perforated structure with multiple voids With pores ranging between 1 and 14 nm. The unique complex structure with the interpenetrating voids and the surface porosity resulted in a high specific surface area of 161.6 m(2).g(-1). The gas sensing property of such double-walled structure was found to vary as a function of the concentric void between the core and the shell. Gas-sensing Measurements in hollow porous core-shell NiO nanotubes exhibited excellent sensitivity toward ethanol, originating from efficient adsorption Of target molecules in the interior voids and their rapid diffusion and transport through the porous structures.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Song, Xuefeng UNSPECIFIED UNSPECIFIED UNSPECIFIED Gao, Lian UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-485419
DOI:	10.1021/jp208093s
Journal or Publication Title:	J. Phys. Chem. C
Volume:	115
Number:	44
Page Range:	S. 21730 - 21736
Date:	2011
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1932-7455
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FACILE SYNTHESIS; HOLLOW SPHERES; THIN-FILMS; CU2O; NANOCRYSTALS; OXIDATION; SENSOR; ROUTE Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48541