Uniformly dispersed Pt-Ni nanoparticles on nitrogen-doped carbon nanotubes for hydrogen sensing
Uniformly dispersed Pt-Ni nanoparticles on nitrogen-doped carbon nanotubes for hydrogen sensing
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DOI：
10.1021/jp908945x
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发表时间：
2010-01
影响因子：
3.7
通讯作者：
A. Sadek;Chen Zhang;Zheng Hu;J. Partridge;D. McCulloch;W. Wlodarski;K. Kalantar-zadeh
中科院分区：
文献类型：
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作者：
A. Sadek;Chen Zhang;Zheng Hu;J. Partridge;D. McCulloch;W. Wlodarski;K. Kalantar-zadeh
氮掺杂的多壁碳纳米管（NCNT），具有约20 nm的平均直径，在650 °C下通过化学气相沉积使用吡啶前体合成。通过微波-多元醇方法在NCNTs上沉积直径约为3 nm且具有不同Pt与Ni摩尔比的Pt-Ni合金纳米颗粒。电子显微镜显示，纳米颗粒均匀沉积在NCNTs的外表面上，并固定在活性氮位点。介电泳技术被用来选择性地排列金属电极之间的铂镍涂层的碳纳米管，形成电导氢气传感器。在不同氢气浓度下的气敏实验表明，基于Pt/NCNTs的传感器具有最快的响应和恢复速度以及最好的灵敏度。Pt/NCNT传感器的传感机理可以解释为氮诱导缺陷和负载Pt纳米颗粒的响应的组合，与…
Nitrogen-doped multiwall carbon nanotubes (NCNTs), having an average diameter of approximately 20 nm, were synthesized at 650 °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...