Brahim Sean, Colbern Steve, Gump Robert, Moser Alex, Grigorian Leonid
YTC America Incorporated, Camarillo, CA 93012, USA.
Nanotechnology. 2009 Jun 10;20(23):235502. doi: 10.1088/0957-4484/20/23/235502. Epub 2009 May 18.
Sensors containing metal-carbon nanotube (CNT) hybrid materials as the active sensing layer were demonstrated for ethanol vapor detection at room temperature. The metal-CNT hybrid materials were synthesized by infiltrating single wall carbon nanotubes (SWNTs) with the transition metals Ti, Mn, Fe, Co, Ni, Pd or Pt. Each sensor was prepared by drop-casting dilute dispersions of a metal-CNT hybrid onto quartz substrate electrodes and the impedimetric responses to varying ethanol concentration were recorded. Upon exposure to ethanol vapor, the ac impedance (Z') of the sensors was found to decrease to different extents. The sensor containing pristine CNT material was virtually non-responsive at low ethanol concentrations (<50 ppm). In contrast, all metal-CNT hybrid sensors showed extremely high sensitivity to trace ethanol levels with 100-fold or more gains in sensitivity relative to the starting SWNT sensor. All hybrid sensors, with the exception of Ni filled CNT, exhibited significantly larger sensor responses to ethanol vapor up to 250 ppm compared to the starting SWNT sensor.
已展示出以金属 - 碳纳米管（CNT）混合材料作为活性传感层的传感器，用于在室温下检测乙醇蒸汽。通过用过渡金属Ti、Mn、Fe、Co、Ni、Pd或Pt渗透单壁碳纳米管（SWNT）来合成金属 - CNT混合材料。通过将金属 - CNT混合物的稀分散液滴铸到石英基底电极上来制备每个传感器，并记录对不同乙醇浓度的阻抗响应。暴露于乙醇蒸汽时，发现传感器的交流阻抗（Z'）会不同程度地降低。含有原始CNT材料的传感器在低乙醇浓度（<50 ppm）下几乎无响应。相比之下，所有金属 - CNT混合传感器对痕量乙醇水平表现出极高的灵敏度，相对于起始的SWNT传感器，灵敏度提高了100倍或更多。除了填充Ni的CNT外，所有混合传感器对高达250 ppm的乙醇蒸汽表现出比起始SWNT传感器明显更大的传感器响应。
