Increasing demand for timely and accurate environmental pollution monitoring and control requires new sensing techniques with outstanding performance, i.e.,high sensitivity, high selectivity, and reliability. Metal–o...Increasing demand for timely and accurate environmental pollution monitoring and control requires new sensing techniques with outstanding performance, i.e.,high sensitivity, high selectivity, and reliability. Metal–organic frameworks(MOFs), also known as porous coordination polymers, are a fascinating class of highly ordered crystalline coordination polymers formed by the coordination of metal ions/clusters and organic bridging linkers/ligands. Owing to their unique structures and properties,i.e., high surface area, tailorable pore size, high density of active sites, and high catalytic activity, various MOF-based sensing platforms have been reported for environmental contaminant detection including anions, heavy metal ions,organic compounds, and gases. In this review, recent progress in MOF-based environmental sensors is introduced with a focus on optical, electrochemical, and field-effect transistor sensors. The sensors have shown unique and promising performance in water and gas contaminant sensing. Moreover, by incorporation with other functional materials, MOF-based composites can greatly improve the sensor performance. The current limitations and future directions of MOF-based sensors are also discussed.展开更多
Organic field-effect transistors are of great importance to electronic devices.With the emergence of various preparation techniques for organic semiconductor materials,the device performance has been improved remarkab...Organic field-effect transistors are of great importance to electronic devices.With the emergence of various preparation techniques for organic semiconductor materials,the device performance has been improved remarkably.Among all of the organic materials,single crystals are potentially promising for high performances due to high purity and well-ordered molecular arrangement.Based on organic single crystals,alignment and patterning techniques are essential for practical industrial application of electronic devices.In this review,recently developed methods for crystal alignment and patterning are described.展开更多
有机场效应晶体管(Organic Field Effect Transistors,OFETs)是以有机半导体材料作为有源层的晶体管器件。和传统的无机半导体器件相比,由于其可应用于生产大面积柔性设备而被人们广泛的研究,在有机发光、有机光探测器、有机太阳能电池...有机场效应晶体管(Organic Field Effect Transistors,OFETs)是以有机半导体材料作为有源层的晶体管器件。和传统的无机半导体器件相比,由于其可应用于生产大面积柔性设备而被人们广泛的研究,在有机发光、有机光探测器、有机太阳能电池、压力传感器、有机存储设备、柔性平板显示、电子纸等众多领域具有潜在而广泛的应用前景。文中对OFET结构和工作原理做了简要介绍,之后重点讨论了最近几年来OFET中有机材料和绝缘体材料的发展状况,接着总结了OFET制备技术及其应用新领域,最后对OFET发展面临问题及应用前景做了归纳和展望。展开更多
This paper reports that the organic field-effect transistors with hybrid contact geometry were fabricated, in which the top electrodes and the bottom electrodes were combined in parallel resistances within one transis...This paper reports that the organic field-effect transistors with hybrid contact geometry were fabricated, in which the top electrodes and the bottom electrodes were combined in parallel resistances within one transistor. With the facility of the novel structure, the difference of contact resistance between the top contact geometry and the bottom contact geometry was studied. The hybrid contact devices showed similar characteristics with the top contact configuration devices, which provide helpful evidence on the lower contact resistance of the top contact configuration device. The origin of the different contact resistance between the top contact device and the bottom contact device was discussed.展开更多
Two new organic crystals of 2,8-bisthienyldibenzothiophene（BTDT） and 2,8-bis-dithienyldibenzothiophene（BDTDT） compounds were successfully obtained.The change of end-capped group from thiophene to dithiophene cause...Two new organic crystals of 2,8-bisthienyldibenzothiophene（BTDT） and 2,8-bis-dithienyldibenzothiophene（BDTDT） compounds were successfully obtained.The change of end-capped group from thiophene to dithiophene causes big differences in molecular packing and carrier-transport property.The adjacent molecules of compound BTDT adopt face-to-face π stacking and exhibit two-dimensional interchain interactions.On the contrary,BDTDT molecules are arranged in an edge-to-face motif and show mainly one-dimensional interacting character.The packing mode exerts dramatic effect on the carrier-transport property.The crystal of BTDT belongs to the orthorhombic system,space group P21212 with a = 20.1427（11）,b = 4.6016（3）,c = 8.6340（5） ,V = 800.27（8） 3,Z = 2,Dc = 1.446 g/cm3,F（000） = 360,S = 1.019,the final R = 0.0491 and wR = 0.0960 for 1605 reflections with I 2σ（I）.The crystal of BDTDT belongs to the orthorhombic system,space group P212121 with a = 7.2636（15）,b = 25.359（5）,c = 25.359 ？,V = 4670.9（14） ？3,Z = 8,Dc = 1.458 g/cm3,F（000） = 2112,S = 0.880,the final R = 0.0597 and wR = 0.1318 for 8047 reflections with I 2σ（I）.展开更多
The n-channel behavior has been occasionally reported in the organic field-effect transistors （OFETs） that usually exhibit p-channel transport only. Reconfirmation and further examination of these unusual device per...The n-channel behavior has been occasionally reported in the organic field-effect transistors （OFETs） that usually exhibit p-channel transport only. Reconfirmation and further examination of these unusual device performances should deepen the understanding on the electron transport in organic semiconductors. 6,13-bis（triisopropyl-silylethynyl） pentacene （TIPS-pentacene）, a widely examined p-channel material as Au is used for source-drain electrodes, has recently been reported to exhibit electron transport when grown from non-polar solvent on divinyltetramethyldisiloxanebis （benzocy- clobutene） （BCB） dielectric, spurring the study on this unusual electron transport. This paper describes FET characteristics of solution-grown TlPS-pentacene single crystals on five polymer gate dielectrics including polystyrene （PS）, poly（methyl methacrylate） （PMMA）, poly（4-vinyl phenol） （PVP）, poly（vinyl alcohol） （PVA） and poly（vinylidene fluoride-trifluoroethylene-chlorofluoroethylene） （P（VDF-TrFE-CFE））. In addition to the p-channel behavior, electron transport occurs in the crystals on PMMA, PS, thick PVA （40 nm） and a bilayer dielectric of PMMA on P（VDF-TrFE-CFE）, while does not on PVP and thin PVA （2 nm）. The two distinct FET characteristics are consistent with the previous reported trap effect of hydroxyl groups （in PVP and PVA） and reduced injection barrier by Na~ ions （as impurity in PVA）. The highest electron mobility of 0.48 cm2 V-1 s-1 has been achieved in the crystals on PMMA. Furthermore, the electron transport is greatly attenuated after the crystals are exposed to the vapor of a variety of polar solvents and the attenuated electron transport partially recovers if the crystals are heated, indicating the adverse effect of polar impurities on electron transport. By reconfirming the n-channel behavior in the OFETs based on TIPS-pentacene, this work has implications for the design of n-channel and ambipolar OFETs.展开更多
基金supported by the National Natural Science Foundation of China (No.21707102)1000 Talents Plan of China
文摘Increasing demand for timely and accurate environmental pollution monitoring and control requires new sensing techniques with outstanding performance, i.e.,high sensitivity, high selectivity, and reliability. Metal–organic frameworks(MOFs), also known as porous coordination polymers, are a fascinating class of highly ordered crystalline coordination polymers formed by the coordination of metal ions/clusters and organic bridging linkers/ligands. Owing to their unique structures and properties,i.e., high surface area, tailorable pore size, high density of active sites, and high catalytic activity, various MOF-based sensing platforms have been reported for environmental contaminant detection including anions, heavy metal ions,organic compounds, and gases. In this review, recent progress in MOF-based environmental sensors is introduced with a focus on optical, electrochemical, and field-effect transistor sensors. The sensors have shown unique and promising performance in water and gas contaminant sensing. Moreover, by incorporation with other functional materials, MOF-based composites can greatly improve the sensor performance. The current limitations and future directions of MOF-based sensors are also discussed.
基金supported by the 973 Program(No.2014CB643503)National Natural Science Foundation of China(Nos.51373150,51461165301)Zhejiang Province Natural Science Foundation(No.LZ13E030002)
文摘Organic field-effect transistors are of great importance to electronic devices.With the emergence of various preparation techniques for organic semiconductor materials,the device performance has been improved remarkably.Among all of the organic materials,single crystals are potentially promising for high performances due to high purity and well-ordered molecular arrangement.Based on organic single crystals,alignment and patterning techniques are essential for practical industrial application of electronic devices.In this review,recently developed methods for crystal alignment and patterning are described.
基金supported by the National Natural Science Foundation of China(51873148,52073206,and 52273193)the Collaborative Innovation Program of Tianjin University and Qinghai Minzu University(2022TQ05)+1 种基金Tianjin Science Foundation(20JCQNJC01990)Haihe Laboratory of Sustainable Chemical Transformations。
文摘有机场效应晶体管(Organic Field Effect Transistors,OFETs)是以有机半导体材料作为有源层的晶体管器件。和传统的无机半导体器件相比,由于其可应用于生产大面积柔性设备而被人们广泛的研究,在有机发光、有机光探测器、有机太阳能电池、压力传感器、有机存储设备、柔性平板显示、电子纸等众多领域具有潜在而广泛的应用前景。文中对OFET结构和工作原理做了简要介绍,之后重点讨论了最近几年来OFET中有机材料和绝缘体材料的发展状况,接着总结了OFET制备技术及其应用新领域,最后对OFET发展面临问题及应用前景做了归纳和展望。
基金supported by National Basic Research Program of China (973 Program) (Grant No 2006CB806204)National Natural Science Foundation of China (Grant Nos 60676001,60676008 and 60825403)
文摘This paper reports that the organic field-effect transistors with hybrid contact geometry were fabricated, in which the top electrodes and the bottom electrodes were combined in parallel resistances within one transistor. With the facility of the novel structure, the difference of contact resistance between the top contact geometry and the bottom contact geometry was studied. The hybrid contact devices showed similar characteristics with the top contact configuration devices, which provide helpful evidence on the lower contact resistance of the top contact configuration device. The origin of the different contact resistance between the top contact device and the bottom contact device was discussed.
基金supported by the Natural Science Foundation of Shandong Province (ZR2011EMQ007)the Doctoral Foundation of Jinan University (XBS1048)
文摘Two new organic crystals of 2,8-bisthienyldibenzothiophene（BTDT） and 2,8-bis-dithienyldibenzothiophene（BDTDT） compounds were successfully obtained.The change of end-capped group from thiophene to dithiophene causes big differences in molecular packing and carrier-transport property.The adjacent molecules of compound BTDT adopt face-to-face π stacking and exhibit two-dimensional interchain interactions.On the contrary,BDTDT molecules are arranged in an edge-to-face motif and show mainly one-dimensional interacting character.The packing mode exerts dramatic effect on the carrier-transport property.The crystal of BTDT belongs to the orthorhombic system,space group P21212 with a = 20.1427（11）,b = 4.6016（3）,c = 8.6340（5） ,V = 800.27（8） 3,Z = 2,Dc = 1.446 g/cm3,F（000） = 360,S = 1.019,the final R = 0.0491 and wR = 0.0960 for 1605 reflections with I 2σ（I）.The crystal of BDTDT belongs to the orthorhombic system,space group P212121 with a = 7.2636（15）,b = 25.359（5）,c = 25.359 ？,V = 4670.9（14） ？3,Z = 8,Dc = 1.458 g/cm3,F（000） = 2112,S = 0.880,the final R = 0.0597 and wR = 0.1318 for 8047 reflections with I 2σ（I）.
基金supported by the 973 Program (No.2014CB643503)National Natural Science Foundation of China (Nos.51373150,51461165301)Zhejiang Province Natural Science Foundation (No.LZ13E030002)
文摘The n-channel behavior has been occasionally reported in the organic field-effect transistors （OFETs） that usually exhibit p-channel transport only. Reconfirmation and further examination of these unusual device performances should deepen the understanding on the electron transport in organic semiconductors. 6,13-bis（triisopropyl-silylethynyl） pentacene （TIPS-pentacene）, a widely examined p-channel material as Au is used for source-drain electrodes, has recently been reported to exhibit electron transport when grown from non-polar solvent on divinyltetramethyldisiloxanebis （benzocy- clobutene） （BCB） dielectric, spurring the study on this unusual electron transport. This paper describes FET characteristics of solution-grown TlPS-pentacene single crystals on five polymer gate dielectrics including polystyrene （PS）, poly（methyl methacrylate） （PMMA）, poly（4-vinyl phenol） （PVP）, poly（vinyl alcohol） （PVA） and poly（vinylidene fluoride-trifluoroethylene-chlorofluoroethylene） （P（VDF-TrFE-CFE））. In addition to the p-channel behavior, electron transport occurs in the crystals on PMMA, PS, thick PVA （40 nm） and a bilayer dielectric of PMMA on P（VDF-TrFE-CFE）, while does not on PVP and thin PVA （2 nm）. The two distinct FET characteristics are consistent with the previous reported trap effect of hydroxyl groups （in PVP and PVA） and reduced injection barrier by Na~ ions （as impurity in PVA）. The highest electron mobility of 0.48 cm2 V-1 s-1 has been achieved in the crystals on PMMA. Furthermore, the electron transport is greatly attenuated after the crystals are exposed to the vapor of a variety of polar solvents and the attenuated electron transport partially recovers if the crystals are heated, indicating the adverse effect of polar impurities on electron transport. By reconfirming the n-channel behavior in the OFETs based on TIPS-pentacene, this work has implications for the design of n-channel and ambipolar OFETs.
