Chemically functionalized single-walled carbon nanotubes as ammonia sensors
Chemically functionalized single-walled carbon nanotubes as ammonia sensors
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DOI：
10.1021/jp0471857
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发表时间：
2004-12-23
影响因子：
3.3
通讯作者：
Haddon, RC
中科院分区：
文献类型：
--
作者：
Bekyarova, E;Davis, M;Haddon, RC
本研究展示了一种基于化学功能化单壁碳纳米管（SWNTs）开发先进化学传感器的新方法。具有共价连接的聚间氨基苯磺酸的SWNT-PABS在检测NH3方面表现出了更好的传感器性能。与纯化的swnt相比，用SWNT-PABS制备的器件在暴露于NH3时的电阻变化高出2倍以上。重要的是，当NH3被氮取代时，SWNT-PABS传感器迅速恢复其电阻。暴露于NH3会导致SWNT-PABS的电子结构发生显著变化，从而可以在低至5ppm的浓度下检测到NH3。探讨了在交叉电极间沉积薄膜作为气体传感器的器件结构。
This study demonstrates a novel approach toward development of advanced chemical sensors based on chemically functionalized single-walled carbon nanotubes (SWNTs). SWNTs with covalently attached poly(m-aminobenzene sulfonic acid), SWNT-PABS, have shown improved sensor performance for detection of NH3. Compared to purified SWNTs, devices fabricated with SWNT-PABS have shown more than 2 times higher change of resistance upon exposure to NH3. Importantly, the SWNT-PABS sensors rapidly recover their resistance when NH3 is replaced with nitrogen. Exposure to NH3 induces significant changes in the electronic structure of SWNT-PABS, which allow detection of NH3 at concentrations as low as 5 ppm. Thin film deposited between interdigitated electrodes was explored as a device configuration for development of gas sensors.