In the present work, we have developed a solution-processable poly (2,5-bis (3-tetradecylthiophen 2yl) thieno(3,2b) thiophene) (PBTTT-C14) based organic thin film transistor, for possible selective sensing the toxic ammonia (NH3) gas at 25°C. This thin-film transistor based sensor makes use of PBTTT-C14 polymer as an organic channel that exhibits highly responsive (>61%) behavior at different levels of ammonia concentrations, even in presence of a mixture of ethanol and butanol gases in a humid environment. The notable changes are observed in the transistor parameters including channel mobility, threshold voltage and the on-off ratio. Interdigitated channels obtained using shadow masking technique enables the device to respond to a low ammonia concentration (<10 ppm). Better sensing capabilities with a detection limit of 2 ppm, the response time of 30 sec and recovery time of 40 sec of exposed ammonia, butanol and ethanol gases have been recorded. The mechanism of sensing has been explained for a better understanding of electrostatic and chemical interaction between gases and PBTTT-C14 semiconductor. Electrical characterizations of the device for the sensing were carried-out in the ambient condition. The device performance has been tested in humid environmental conditions. The fabricated device exhibited enormous potential for ammonia sensing for real-life applications.

中文翻译：

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Poly[2,5-bis(3-tetradecylthiophen-2-yl) thieno [3,2-b] thiophene] 基于有机聚合物的交叉通道启用薄膜晶体管，用于在 25° 检测选择性低 ppm 氨感测

在目前的工作中，我们开发了一种可溶液加工的聚（2,5-双（3-十四烷基噻吩 2yl）噻吩（3,2b）噻吩）（PBTTT-C14）基有机薄膜晶体管，用于可能的选择性感应有毒物质氨 (NH3) 气，温度为 25°C。这种基于薄膜晶体管的传感器使用 PBTTT-C14 聚合物作为有机通道，即使在潮湿环境中存在乙醇和丁醇气体的混合物，在不同氨浓度水平下也表现出高度响应 (>61%) 行为. 在晶体管参数中观察到显着变化，包括沟道迁移率、阈值电压和开关比。使用阴影掩蔽技术获得的交叉通道使设备能够响应低氨浓度 (<10 ppm)。更好的传感能力，检测限为 2 ppm，已记录了 30 秒的响应时间和 40 秒的暴露氨、丁醇和乙醇气体的恢复时间。为了更好地理解气体和 PBTTT-C14 半导体之间的静电和化学相互作用，已经解释了传感机制。用于传感的设备的电气特性是在环境条件下进行的。器件性能已在潮湿环境条件下进行测试。所制造的设备在氨传感在现实生活中的应用方面表现出巨大的潜力。用于传感的设备的电气特性是在环境条件下进行的。器件性能已在潮湿环境条件下进行测试。所制造的设备在氨传感在现实生活中的应用方面表现出巨大的潜力。用于传感的设备的电气特性是在环境条件下进行的。器件性能已在潮湿环境条件下进行测试。所制造的设备在氨传感在现实生活中的应用方面表现出巨大的潜力。