Highly dispersed gold (Au) nanoparticles (NPs) supported on nitrogen doped multi-walled carbon nanotubes (NCNTs) were synthesised using a simple electrochemical method. Morphology of Au-NPs and their dispersion profile were studied depending on the applied potential and deposition duration. Novel conductometric gas sensors were developed from the thin films of Au-NPs/NCNTs nanocomposites and evaluated towards H2 gas. Electron microscopy revealed that the Au-NPs were deposited homogeneously on the outer surface of the NCNTs. The average size of the Au-NPs is 5 nm when the applied potential is 10 V for 10 mins and 10 nm when the applied potential is 20 V for 10 mins. The sensors were exposed to different concentrations of H2 in synthetic air at room temperature. The highest sensitivity of 75% was measured towards 1% H2 when average size of Au-NPs on NCNTs is 5 nm.
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机译：使用简单的电化学方法合成了负载在氮掺杂多壁碳纳米管（NCNT）上的高度分散的金（Au）纳米颗粒（NPs）。根据所施加的电势和沉积时间，研究了金纳米颗粒的形貌及其分散特性。从Au-NPs / NCNTs纳米复合材料薄膜开发了新型电导气体传感器，并针对H 2 气体进行了评估。电子显微镜显示，Au-NPs均匀沉积在NCNTs的外表面。当施加的电势为10 V 10分钟时，Au-NP的平均大小为5 nm;当施加的电势为20 V 10 min时，Au-NP的平均大小为10 nm。传感器在室温下暴露于合成空气中不同浓度的H 2 。当NCNT上Au-NP的平均大小为5 nm时，朝1％H 2 测得的最高灵敏度为75％。
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