Uniformly Dispersed Pt-Ni Nanoparticles on Nitrogen-Doped Carbon Nanotubes for Hydrogen Sensing

被引：56

作者：

Sadek, A. Z. ^{[1
,2
]}

Zhang, C. ^{[1
]}

Hu, Z. ^{[3
]}

Partridge, J. G. ^{[2
]}

McCulloch, D. G. ^{[2
]}

Wlodarski, W. ^{[1
]}

Kalantar-zadeh, K. ^{[1
]}

机构：

[1] RMIT Univ, Sch Elect & Comp Engn, Melbourne, Vic 3001, Australia

[2] RMIT Univ, Sch Appl Sci, Melbourne, Vic 3001, Australia

[3] Nanjing Univ, Key Lab Mesoscop Chem MOE, Sch Chem & Chem Engn, Nanjing 210093, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 01期

关键词：

METHANOL OXIDATION; CNX NANOTUBES; PLATINUM NANOPARTICLES; CATALYST SUPPORT; GAS SENSOR; FILMS; ADSORPTION; STORAGE; GROWTH; VAPOR;

D O I：

10.1021/jp908945x

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：

Nitrogen-doped multiwall carbon nanotubes (NCNTs), having an average diameter of approximately 20 nm, were synthesized at 650 degrees C by chemical vapor deposition using a pyridine precursor. Pt-Ni alloyed nanoparticles with approximate diameter 3 nm and with different Pt to Ni molar ratios were deposited on the NCNTs by a microwave-polyol method. Electron microscopy revealed that the nanoparticles were deposited homogeneously on the outer surface of the NCNTs and were immobilized at active nitrogen sites. A dielectrophoresis technique was used to selectively align the Pt-Ni-coated NCNTs between metallic electrodes to form conductometric hydrogen gas sensors. Gas sensing measurements performed with different concentrations of hydrogen revealed that the sensor based upon Pt/NCNTs exhibited the fastest response and recovery and best sensitivity. The sensing mechanism in the Pt/NCNT sensors can be explained by a combination of responses from the nitrogen-induced defects and the supported Pt nanoparticles, with the latter providing significantly faster response and recovery.

引用

页码：238 / 242

页数：5

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