Single-walled carbon nanotubes (SWNTs) have been functionalized electrochemically with porphyrin and were employed as the channel to fabricate the chemical field-effect transistor. Tetraphenylporphyrin was chosen for functionalization purpose. The primary aim of this study was to evaluate the sensing performance of functionalized SWNTs for the detection of BTEX vapor and to understand the underlying mechanism for the detection. The functionalization showed a significant enhancement in the sensing response for all analytes starting from 1.25 ppm to 15 ppm of concentration. A sub-ppm limit of detection was also observed. The systematic study of field effect transistor (FET) measurements indicates that the sensing mechanism is dominated by the electrostatic gating effect.

单壁碳纳米管 (SWNT) 已用卟啉进行电化学功能化，并被用作制造化学场效应晶体管的通道。选择四苯基卟啉用于功能化目的。本研究的主要目的是评估功能化单壁碳纳米管检测 BTEX 蒸气的传感性能，并了解检测的潜在机制。功能化显示所有分析物的传感响应显着增强，从 1.25 ppm 到 15 ppm 的浓度。还观察到低于 ppm 的检测限。对场效应晶体管 (FET) 测量的系统研究表明，感应机制由静电门控效应主导。