Speakers

Prof. Feng YAN has research interests on organic electronics, 2D materials, solar cells, thin film transistors, biosensors and smart materials. He received his PhD degree in physics from Nanjing University in 1997 and then worked at the Department of Physics of Nanjing University as Associate Professor until Jan 2001. He joined the Engineering Department of Cambridge University in Feb 2001 as a Research Associate and joined National Physical Laboratory in UK in April 2006 as a Higher Research Scientist. He became an Assistant Professor at the Department of Applied Physics of the Hong Kong Polytechnic University in September 2006 and was promoted to Full Professor in 2016. He has published more than 280 papers in peer-reviewed journals including Advanced Materials, Nature Communications, Science Advances, Nano Letters, ACS Nano, Chemical Society Reviews, Energy & Environmental Science, Angewandte Chemie International Edition and Journal of the American Chemical Society, and given more than 70 invited talks in international conferences. The publications have received more than 20,000 citations with h-index of 79 in google scholar. He is a “highly cited researcher” selected by ClarivateTM in 2021, a fellow of the Royal Society of Chemistry and a Senior member of IEEE. 

Flexible organic transistors for sensing applications

Abstract

Flexible organic transistors have been successfully used in numerous sensing applications, such as biosensors, photodetectors and chemical sensors. Our group have been working on organic transistor –based sensors for many years. In this talk, I will introduce the following applications: (1) Biosensors based on organic transistors. By modifying the gate electrodes of organic transistors, we have realized the detection of various type of biomolecules, such as IgG antibody, protein biomarkers and RNA. In particular, portable and ultrasensitive COVID-19 IgG detection has been achieved with low-cost and flexible organic electrochemical transistors. (2) Transistors based on 2D metal-organic frameworks (MOF) Films. Flexible photodetectors based on MOF thin films exhibit reliable photo-responses at room temperature in a wavelength region from ultraviolet (UV) to mid-infrared (MIR). The photodetectors can show a typical synaptic behavior and excellent data recognition accuracy in artificial neural networks. Moreover, we have demonstrated high-performance organic electrochemical transistors based on highly oriented 2D c-MOFs and used for various sensing applications. These works indicate that organic transistors are excellent transducers for flexible/wearable electronics. 

Figure 1: Scheme of the portable sensing system and the gate modification processes of the COVID-19 IgG sensor.

Reference

1. H. Liu, A. Yang, J. Song, N. X. Wang, P. Lam, Y. Li, H. K.-W. Law, F Yan*,Ultrafast, sensitive and portable detection of COVID-19 IgG using flexible organic electrochemical transistors, Science Advances 2021, 7, eabg8387.
2. C.-K. Liu, V. Piradi, J. Song, Z. Wang, L.-W. Wong, E.-H.-L. Tan, J. Zhao, X. Zhu, F. Yan, 2D Metal-Organic Framework Cu₃(HHTT)₂ Films for Broadband Photodetectors from Ultraviolet to Mid-infrared, Adv. Mater. 2022.