中文摘要：

以α-六噻吩（α-msexithiophene，α-6T）为有源层，二氧化硅（SiO2）为绝缘层，钛／金（Ti／Au）为电极，分别制备了沟道宽长比为40、160和640的有机薄膜晶体管（Organicthin-filmtransistors，OTFT）器件。讨论了OTFT器件的宽长比对二氧化氮气敏性能的影响。结果表明，基于α-6T的OTFT器件对二氧化氮气体具有较高的实时响应；OTFT器件对二氧化氮气体的气敏性能与沟道宽长比有依赖关系，随着沟道宽长比的增大，器件的响应灵敏度提高、响应时间延长，宽长比为160的器件气敏性能最佳。

英文摘要：

Three kinds of organic thin-film transistors （OTFT） with different ratios of channel width to length were fabricated,α-sexithiophene （α-6T） and silicon dioxide （SiO2） were used as the active layer and the insulating layer, respectively, titanium/aurum （Ti/Au） were made as the electrode for the prepared OTFT,and the three ratios of channel width to length were 40, 160 and 640. The influences of α-6T OTFT devices of different channel ratios on gas sensitive properties were discussed. The results showed that the α-6T based OTFT had good real-time response to NO2, the ratio of channel width to length had effect on gas response, the response sensitivity became higher and re- sponse time became longer when the ratio of channel width to length increased, and a device with a ratio of channel width to length of 160 exhibited the optimum gas sensing property.