Demonstration of Hole Transport and Voltage Equilibration in Self-Assembled π-Conjugated Peptide Nanostructures Using Field-Effect Transistor Architectures
Demonstration of Hole Transport and Voltage Equilibration in Self-Assembled π-Conjugated Peptide Nanostructures Using Field-Effect Transistor Architectures
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DOI：
10.1021/acsnano.5b05752
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发表时间：
2015-12-01
期刊：
影响因子：
17.1
通讯作者：
Katz, Howard E.
中科院分区：
文献类型：
--
作者：
Besar, Kalpana;Ardona, Herdeline Ann M.;Katz, Howard E.
π-缀合肽材料由于其独特的生物物理特性、生物功能界面和在水性条件下的可加工性而对生物电子学具有吸引力。为了与电气应用相关，这些类型的材料必须能够支持电流的通过和施加电压的传输。本文呈现的是一维π缀合肽纳米结构的电流和电压传输活性的研究。观察的纳米结构作为半导体和栅极层的有机场效应晶体管（OFFERS），和氨基酸组成的系统变化的影响的半导体/导电功能的纳米结构进行了研究。当纳米结构具有四噻吩核并且组装的肽材料跨越源极和漏极时，这些分子变化直接影响纳米材料活性层观察到的空穴迁移率值超过3个数量级（类似于0.02至5 × 10（-5）cm（2）V-1 s（-1））。没有四噻吩核心的肽被用作对照，没有显示出场效应电流，验证了纳米结构的传输特性依赖于π电子核心的半导体行为，而不仅仅是离子重排。我们还表明，纳米材料可以充当栅电极，并评估了在器件中改变栅极电介质层厚度的效果，其中常规有机半导体并五苯跨越顶部接触OFET中的源极和漏极，显示出具有35-40 nm电介质厚度的最佳性能。这项研究表明，这些在水环境中自组装的肽可以成功地用于在生物相关距离内传输电子信号。
pi-Conjugated peptide materials are attractive for bioelectronics due to their unique photophysical characteristics, biofunctional interfaces, and processability under aqueous conditions. In order to be relevant for electrical applications, these types of materials must be able to support the passage of current and the transmission of applied voltages. Presented herein is an investigation of both the current and voltage transmission activities of one-dimensional pi-conjugated peptide nanostructures. Observations of the nanostructures as both semiconducting and gate layers in organic field-effect transistors (OFETs) were made, and the effect of systematic changes in amino acid composition on the semiconducting/conducting functionality of the nanostructures was investigated. These molecular variations directly impacted the hole mobility values observed for the nanomaterial active layers over 3 orders of magnitude (similar to 0.02 to 5 x 10(-5) cm(2) V-1 s(-1)) when the nanostructures had quaterthiophene cores and the assembled peptide materials spanned source and drain electrodes. Peptides without the quaterthiophene core were used as controls and did not show field-effect currents, verifying that the transport properties of the nanostructures rely on the semiconducting behavior of the pi-electron core and not just ionic rearrangements. We also showed that the nanomaterials could act as gate electrodes and assessed the effect of varying the gate dielectric layer thickness in devices where the conventional organic semiconductor pentacene spanned the source and drain electrodes in a top-contact OFET, showing an optimum performance with 35-40 nm dielectric thickness. This study shows that these peptides that self-assemble in aqueous environments can be used successfully to transmit electronic signals over biologically relevant distances.