Synthesis and Characterization of TeO<sub>2</sub> Nanowires

Liu, Zhifu; Yamazaki, Toshinari; Shen, Yanbai; Kikuta, Toshio; Nakatani, N.

doi:10.1143/jjap.47.771

Cited by 45 publications

(21 citation statements)

References 27 publications

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“…7,8 TeO 2 nanorods have been synthesized by the thermal evaporation of Te powders, 9 laser ablation of Te, 7 and direct thermal oxidation of Te at ambient pressure in a flow of O 2 without the presence of a catalyst. 10 Microcrystals of TeO 2 have been synthesized by the hydrolysis of tellurium isopropoxide in the presence of a tetra alkyl ammonium bromide solution.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Gas Sensing Properties of Pt-Loaded TeO₂Nanorods

Jin¹,

Park²,

Kim³

et al. 2012

Bulletin of the Korean Chemical Society

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The NO2 gas sensing properties of multiple-networked, Pt-loaded TeO2 nanorod sensors were examined. Scanning electron microscopy revealed nanowires with diameters of 50-100 nm and lengths of a few micrometers. Transmission electron microscopy and X-ray diffraction showed that the nanrods were tetragonal-structured, single crystal TeO2. The Pt-loaded TeO2 nanorod sensors exhibited sensitivities of 11.00, 10.26, 11.23 and 11.97% at NO2 concentrations of 10, 50, 100 and 200 ppm, respectively, at 300 o C. These sensitivities were more than 10 times higher than those of bare-TeO2 nanorod sensors. The response times of the sensors were 310, 260, 270 and 230 sec at NO2 concentrations of 10, 50, 100 and 200 ppm, respectively. The recovery times of the Pt-loaded TeO2 nanorods were 390, 330, 335, and 330 sec at NO2 concentrations of 10, 50, 100 and 200 ppm, respectively. The origin of the enhanced sensing properties of the TeO2 nanorods by Pt loading is discussed.

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Section: Introductionmentioning

confidence: 99%

Enhanced Gas Sensing Properties of Pt-Loaded TeO₂Nanorods

Jin¹,

Park²,

Kim³

et al. 2012

Bulletin of the Korean Chemical Society

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“…The unique physical and chemical properties of Tellurium dioxide (TeO 2 ) make it suitable for a wide range of applications including deflectors [1], modulators [2], dosimeters [3,4], optical storage material [5], laser devices [6], and gas sensors [7,8]. TeO 2 nanorods have been synthesized by a range of techniques such as thermal evaporation of Te powders [11], laser ablation of Te [7], and thermal oxidation of Te in a flow of O 2 with no use of catalyst [12].…”

Section: Introductionmentioning

confidence: 99%

“…TeO 2 nanorods have been synthesized by a range of techniques such as thermal evaporation of Te powders [11], laser ablation of Te [7], and thermal oxidation of Te in a flow of O 2 with no use of catalyst [12]. Huriet et al [13] synthesized microcrystals of TeO 2 by hydrolysis of tellurium isopropoxide in the presence of tetra alkyl ammonium bromide solution.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the emission from TeO₂ nanorods by encapsulation with ZnO

Jin¹,

Kim²,

Lee³

2011

Cryst. Res. Technol.

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TeO 2 -core/ZnO-shell nanorods were synthesized by a two-step process comprising thermal evaporation of Te powders and atomic layer deposition of ZnO. Scanning electron microscopy images exhibit that the core-shell nanorods are 50 -150 nm in diameter and up to a few tens of micrometers in length, respectively. Transmission electron microscopy and X-ray diffraction analysis revealed that the cores and shells of the core-shell nanorods were polycrystalline simple tetragonal TeO 2 and amorphous ZnO with ZnO nanocrystallites locally, respectively. Photoluminescence measurement revealed that the TeO 2 nanorods had a weak broad violet band at approximately 430 nm. The emission band was shifted to a yellowish green region (~540 nm) by encapsulation of the nanorods with a ZnO thin film and the yellowish green emission from the TeO 2 -core/ZnO-shell nanorods was enhanced significantly in intensity by increasing the shell layer thickness. The highest emission was obtained for 125 ALD cycles (ZnO coating layer thickness: ~15 nm) and its intensity was much higher than that of the emission from the uncapsulated TeO 2 nanorods. The origin of the enhancement of the emission by the encapsulation is discussed in detail.

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“…In their experiment, the vapors of elemental tellurium evaporated by laser ablation were deposited on the surface of a heated glass surface and then formed nanorods by oxidation with hot air atmosphere. Liu et al [21] prepared TeO 2 nanowires by thermal evaporation of Te metal in air on a silicon substrate put in the crucible above the powder. The synthesized wires were ten of microns in length and with diameter up to few hundreds of nanometers.…”

Section: Introductionmentioning

confidence: 99%