Enhanced Sensitivity of Gas Sensor Based on Poly(3-hexylthiophene) Thin-Film Transistors for Disease Diagnosis and Environment Monitoring.
Enhanced Sensitivity of Gas Sensor Based on Poly(3-hexylthiophene) Thin-Film Transistors for Disease Diagnosis and Environment Monitoring.
复制标题
基于疾病诊断和环境监测的聚（3-己基噻吩）薄膜晶体管的气体传感器的灵敏度增强。
DOI：
10.3390/s150409592
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发表时间：
2015-04-22
期刊：
影响因子：
--
通讯作者：
Fonseca FJ
中科院分区：
文献类型：
--
作者：
Cavallari MR;Izquierdo JE;Braga GS;Dirani EA;Pereira-da-Silva MA;Rodríguez EF;Fonseca FJ
基于有机薄膜晶体管（OTFT）的电子器件有可能满足对便携式和低成本小工具的需求，主要是作为原位疾病诊断和环境监测的传感器。为此，聚（3-己基噻吩）（P3 HT）作为广泛使用的底栅/底接触OTFT结构中的有源层沉积在覆盖有热生长氧化物的高掺杂硅衬底上，以检测气相化合物。与裸传感器相比，有机氯和氨的灵敏度提高了10倍，证实了这种半导体聚合物在传感器中的应用。此外，P3 HT TFT呈现出比本文提出的任何化学传感器高大约三阶的归一化灵敏度。结果表明，虽然TFT在本文的最低浓度值下线性响应，但化学传感器呈现出大多高于2000 ppm的这种操作状态。电荷载流子迁移率和阈值电压的同时改变负责将氨的检测限推低至ppm单位，以及数十ppm的醇或酮。然而，P3 HT晶体管和化学传感器可以组成在室温下操作的电子鼻，用于气体分析物的宽范围浓度评估（1- 10，000 ppm）。目标分析物不仅包括尿毒症、肝硬化、肺癌和糖尿病等疾病的生物标志物，还包括食品、化妆品和微电子工业中用于环境监测的气体。
Electronic devices based on organic thin-film transistors (OTFT) have the potential to supply the demand for portable and low-cost gadgets, mainly as sensors for in situ disease diagnosis and environment monitoring. For that reason, poly(3-hexylthiophene) (P3HT) as the active layer in the widely-used bottom-gate/bottom-contact OTFT structure was deposited over highly-doped silicon substrates covered with thermally-grown oxide to detect vapor-phase compounds. A ten-fold organochloride and ammonia sensitivity compared to bare sensors corroborated the application of this semiconducting polymer in sensors. Furthermore, P3HT TFTs presented approximately three-order higher normalized sensitivity than any chemical sensor addressed herein. The results demonstrate that while TFTs respond linearly at the lowest concentration values herein, chemical sensors present such an operating regime mostly above 2000 ppm. Simultaneous alteration of charge carrier mobility and threshold voltage is responsible for pushing the detection limit down to units of ppm of ammonia, as well as tens of ppm of alcohol or ketones. Nevertheless, P3HT transistors and chemical sensors could compose an electronic nose operated at room temperature for a wide range concentration evaluation (1–10,000 ppm) of gaseous analytes. Targeted analytes include not only biomarkers for diseases, such as uremia, cirrhosis, lung cancer and diabetes, but also gases for environment monitoring in food, cosmetic and microelectronics industries.
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影响因子：
2.1
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