Griffith Matthew J, Cooling Nathan A, Elkington Daniel C, Wasson Michael, Zhou Xiaojing, Belcher Warwick J, Dastoor Paul C
Centre for Organic Electronics, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia.
School of Aeronautical, Mechanical and Mechatronic Engineering, University of Sydney, Camperdown, NSW 2006, Australia.
Nanomaterials (Basel). 2021 Apr 30;11(5):1185. doi: 10.3390/nano11051185.
This work reports the development of a highly sensitive pressure detector prepared by inkjet printing of electroactive organic semiconducting materials. The pressure sensing is achieved by incorporating a quantum tunnelling composite material composed of graphite nanoparticles in a rubber matrix into the multilayer nanostructure of a printed organic thin film transistor. This printed device was able to convert shock wave inputs rapidly and reproducibly into an inherently amplified electronic output signal. Variation of the organic ink material, solvents, and printing speeds were shown to modulate the multilayer nanostructure of the organic semiconducting and dielectric layers, enabling tuneable optimisation of the transistor response. The optimised printed device exhibits rapid switching from a non-conductive to a conductive state upon application of low pressures whilst operating at very low source-drain voltages (0-5 V), a feature that is often required in applications sensitive to stray electromagnetic signals but is not provided by conventional inorganic transistors and switches. The printed sensor also operates without the need for any gate voltage bias, further reducing the electronics required for operation. The printable low-voltage sensing and signalling system offers a route to simple low-cost assemblies for secure detection of stimuli in highly energetic systems including combustible or chemically sensitive materials.
这项工作报道了一种通过喷墨打印电活性有机半导体材料制备的高灵敏度压力探测器的研发情况。压力传感是通过将由橡胶基质中的石墨纳米颗粒组成的量子隧穿复合材料融入印刷有机薄膜晶体管的多层纳米结构中来实现的。这种印刷器件能够将冲击波输入快速且可重复地转换为固有放大的电子输出信号。研究表明，有机墨水材料、溶剂和印刷速度的变化可调节有机半导体和介电层的多层纳米结构，从而实现对晶体管响应的可调优化。优化后的印刷器件在施加低压时能在非常低的源漏电压（0 - 5 V）下快速从非导电状态切换到导电状态，这一特性在对杂散电磁信号敏感的应用中常常是必需的，但传统无机晶体管和开关却无法提供。该印刷传感器在无需任何栅极电压偏置的情况下也能工作，进一步减少了运行所需的电子元件。这种可打印的低电压传感和信号系统为在包括可燃或化学敏感材料在内的高能系统中进行刺激的安全检测提供了一种实现简单低成本组件的途径。
