報告題目：Proton sensitive organic thin film transistors for sensors and bioelectronics
報告人：Ph.D Soniya（Queensland University of Technology）
In the last few years, there has been significant progress in bionic devices such as electronic skin. For these devices to be fully integrated in the human body, bioelectronic interfacial devices that can act as transducers between the human body and electronic components are crucial. The challenge lies in the difference between the intrinsic modes of sending signals in electronic devices and the biological world. Most electronic devices send signals through flow of electrons while biological systems exchange information through flux of ions such as Na+, K+, etc. and protons. There is a considerable interest in developing bioinspired proton conducting materials and solid-state devices for bioelectronic applications.
In this talk, I will present our recent work where we demonstrated a new class of proton conducting gate materials, sulfonated mesoporous silica nanoparticles (SMSN) [1, 2], that are able to sense protons in an all solid state, low voltage operating organic thin film transistor (OTFT). The OTFTs, which are solution processed, maintained low voltage transistor output characteristics for operating source-drain voltages 0 > Vds > -2 V. Detection of proton is signalled by strong modulation in the channel current. We will also present proton sensitive OTFTs with a mixed gate electrode of PEDOT:PSS and SMSN, which has improved transistor characteristics . Additionally, we will present further work on improvement in sensitivity of the OTFTs and their applications in biosensors.
1. Yambem, S.D.; Timm, J.; Weiss, M.; Pandey, A.K. and Marschall, R. Sulfonated Mesoporous Silica as Proton Exchanging Layer in Solid‐State Organic Transistor, Advanced Electronic Materials, 2017, 3, 1700316.
2. Marschall, R., Bannat, I., Feldhoff, A., Wang, L., Lu, G.Q. Wark, M. Nanoparticles of Mesoporous SO3H-Functionalized Si-MCM-41 with Superior Proton Conductivity, Small, 2009, 5, 854-859.
3. Yambem, S.D.; Burns, S.; Arthur, J.N.; Timm, J.; Woodruff, M.A.; M; Pandey, A.K.; Marschall, A highly porous and conductive composite gate electrode for OTFT sensors, RSC Advances 2019, 9, 7278-7284.
Dr Soniya Yambem completed her Ph.D. at the University of Houston, Texas, USA in Dec 2011. She then moved to Australia to work as a post-doctoral researcher at Centre for Organic Photonics and Electronics (COPE) at the University of Queensland, Brisbane. In 2015, Soniya joined Queensland University of Technology (QUT), Brisbane as a Vice Chancellors’ Research Fellow and started building her own research group. Soniya is now a lecturer in physics at QUT. Starting from her Ph.D., Soniya worked in the area of organic electronic devices. At QUT, her work is focussed on organic optoelectronic devices and bio-electronic interface devices for applications in bionics and sensors.