PLEASE JOIN OUR FRIDAY SEMINARS

The CCCN-CityU-PolyU Joint Seminar Series began in 2001, and has since become regular weekly meetings for visitors, faculty, researchers and students to discuss latest progresses in their research.

The next seminar is:

Date & Time: May 15, 2026, Friday, 4:30pm-5:30pm
Title: Design and Applications of Triboelectric Nanogenerators

Speaker: Mr Yonghong Liufu, City University of Hong Kong

Venue: FYW-3316 CityU
Zoom ID 859 8869 4437
Password 123456

Abstract:
Self-powered systems aim to harvest ambient energy and use it directly for sensing, signal processing and communication. Among different energy-harvesting technologies, triboelectric nanogenerators provide a promising route for converting distributed mechanical energy into electrical signals and power, especially for wearable devices, distributed sensors and low-frequency mechanical inputs. However, their practical use remains limited by inefficient energy extraction and unstable sensing outputs. In contact-separation devices, air breakdown, charge loss and unfavorable capacitance evolution restrict transferable charge and harvested energy. In sensing applications, highly pulsed and variable source outputs make stable quantitative readout difficult, especially under weak or single-event mechanical inputs. This seminar aims to discuss two device-system co-design strategies: displacement-programmed capacitance control for energy harvesting and source-free decay readout for self-powered sensing. The first strategy reshapes the capacitance evolution of contact-separation triboelectric nanogenerators to suppress premature micro-gap discharge and increase harvested energy. The second strategy converts weak transient events into temporally separated feature pulses and extracts quantitative information from the ratio of post-source decay times rather than raw triboelectric amplitudes.This seminar also shares his perspective on identifying application scenarios where the unique pulsed, high-voltage and event-driven characteristics of TENGs can provide practical value, rather than simply replacing conventional powered sensors. Together, these approaches aim to advance the practical application of TENGs in self-powered electronics and sensing.

Speaker's Bio:
Yonghong Liufu received his B.S.E. degree in 2018 and subsequently worked as an electrical engineer for one year at China Southern Airlines. He obtained an M.Eng. degree in Electrical Engineering from South China University of Technology in 2023 and is currently a Ph.D. student in Electrical Engineering at City University of Hong Kong. His research interests include self-powered sensing systems, energy harvesting, and power electronics for nanogenerator systems.

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The Centre for Complexity and Complex Networks aims to conduct emerging and cutting-edge research in the multidisciplinary area of complex systems and networks, including fundamental theory in dynamical networked systems and cyber physical systems, and applications in

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Through the significant and groundbreaking contributions of its members to the fundamental theory of nonlinear science and applications over the past 20 more years, the centre has established itself as one of the leading research centres in the world focusing on nonlinear science, complexity and complex systems.

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WHAT'S NEWS

Congratulations to Prof. Michael Tse on his being inducted to the Hong Kong Academy of Engineering as its Fellow.

The Hong Kong Academy of Engineering announced on November 26, 2025, the induction of twelve exceptional professionals as Fellows, who were elected at its 32nd annual general meeting on September 8, 2025 and were formally inducted at a ceremony held on November 24, 2025 at HOPEWELL Hotel. The citation for Prof. Tse's election is "For pioneering contributions in power electronics, including ultra-fast-transient voltage regulation, sliding-mode control for converters, robust EV charging, and wireless power transfer."

Congratulations to Prof. Ron Chen on being awarded The Ichtiaroglou Award
The Ichtiaroglou Award recognizes Prof. Chen's lifetime achievement in Nonlinear Systems Theory. The award ceremony will be held at the Second DANOC Days of Applied Nonlinearity and Complexity in January 2026.

Our Centre and The Applied Mathematical Science Research Centre of Jiangsu Province have recently signed an MoU to promote academic research, exchange, and sharing of results and resource, aiming to promote high-quality research and knowledge transfer in areas of complex systems, networks, applied mathematics. This agreement will strengthen the collaborative relationship between the two centres, and foster talent exchange and development between Hong Kong and Jiangsu Province.

Congratulations!

Prof Ron Chen was elected as NetSci Fellow 2025! The NetSci Fellowship recognizes researchers who have made outstanding and significant contributions to network science research and to the community of network scientists. Elected nominees are named Fellows of the Network Science Society. The Fellowship will be awarded each year to up to 7 members of the community on the basis of their exceptional life-long individual contributions to any area of network science research and to the community of network scientists (locally and globally). All members of the community are eligible for nomination and election to the Fellowship. Selection from the pool of nominees will be conducted by the Fellowship Committee, to be appointed by the Network Science Society board and composed of a minimum of 4 prominent researchers active in the area of network science.

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Released October 2024

PLEASE JOIN OUR FRIDAY SEMINARS

Our Mission

Date & Time:	May 15, 2026, Friday, 4:30pm-5:30pm
Title:	Design and Applications of Triboelectric Nanogenerators
Speaker:	Mr Yonghong Liufu, City University of Hong Kong
Venue:	FYW-3316 CityU Zoom ID 859 8869 4437 Password 123456
Abstract:	Self-powered systems aim to harvest ambient energy and use it directly for sensing, signal processing and communication. Among different energy-harvesting technologies, triboelectric nanogenerators provide a promising route for converting distributed mechanical energy into electrical signals and power, especially for wearable devices, distributed sensors and low-frequency mechanical inputs. However, their practical use remains limited by inefficient energy extraction and unstable sensing outputs. In contact-separation devices, air breakdown, charge loss and unfavorable capacitance evolution restrict transferable charge and harvested energy. In sensing applications, highly pulsed and variable source outputs make stable quantitative readout difficult, especially under weak or single-event mechanical inputs. This seminar aims to discuss two device-system co-design strategies: displacement-programmed capacitance control for energy harvesting and source-free decay readout for self-powered sensing. The first strategy reshapes the capacitance evolution of contact-separation triboelectric nanogenerators to suppress premature micro-gap discharge and increase harvested energy. The second strategy converts weak transient events into temporally separated feature pulses and extracts quantitative information from the ratio of post-source decay times rather than raw triboelectric amplitudes.This seminar also shares his perspective on identifying application scenarios where the unique pulsed, high-voltage and event-driven characteristics of TENGs can provide practical value, rather than simply replacing conventional powered sensors. Together, these approaches aim to advance the practical application of TENGs in self-powered electronics and sensing.
Speaker's Bio:	Yonghong Liufu received his B.S.E. degree in 2018 and subsequently worked as an electrical engineer for one year at China Southern Airlines. He obtained an M.Eng. degree in Electrical Engineering from South China University of Technology in 2023 and is currently a Ph.D. student in Electrical Engineering at City University of Hong Kong. His research interests include self-powered sensing systems, energy harvesting, and power electronics for nanogenerator systems.