Qi‐Jun Sun

Guangdong University of Technology

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Vellaisamy A. L. Roy

City University of Hong Kong

Yan Yan

Shenzhen University

Ye Zhou

Shenzhen University

Jiaqing Zhuang

University of Shanghai for Science and Technology

Su‐Ting Han

Hong Kong Polytechnic University

Li Zhou

Hefei University of Technology

Xin‐Gui Tang

Guangdong University of Technology

Xinhua Zhao

Southern University of Science and Technology

Zhenhua Tang

Guangdong University of Technology

S. Venkatesh

City University of Hong Kong

Cooperative Institutions

Guangdong University of Technology

Chinese Academy of Sciences

City University of Hong Kong

Soochow University

Shenzhen University

South China University of Technology

University of Chinese Academy of Sciences

Zhengzhou University

Sun Yat-sen University

State Council of the People's Republic of China

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An Overview of the Development of Flexible Sensors

Advanced Materials (2017)

Su‐Ting Han Haiyan Peng Qi‐Jun Sun S. Venkatesh K.S. Chung

Flexible sensors that efficiently detect various stimuli relevant to specific environmental or biological species have been extensively studied due to their great potential for the Internet of Things and wearable electronics applications. The application of flexible and stretchable electronics to device-engineering technologies has enabled the fabrication of slender, lightweight, stretchable, and foldable sensors. Here, recent studies on flexible sensors for biological analytes, ions, light, and pH are outlined. In addition, contemporary studies on device structure, materials, and fabrication methods for flexible sensors are discussed, and a market overview is provided. The conclusion presents challenges and perspectives in this field.

Stretchable electronics

Wearable Technology

Flexible Electronics

10.1002/adma.201700375

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Citations (612)

Photoelectric Dual-Mode and Nonvolatile Modulation Based on Ferroelectric Memristors for Reservoir Computing

ACS Sustainable Chemistry & Engineering (2024)

Dong-Liang Li Xin‐Gui Tang Wen-Min Zhong Qi‐Jun Sun Dongping Yang

Drawing on the function of biological synapses, the development of electronic synaptic devices aims to achieve a neuromorphic computing system with high performance and low energy consumption. In this work, the Ruddlesen–Popper phase Ba2TiO4/TiO2 heterojunction memristor was prepared by the sol–gel method. Hysteresis loops and piezoelectric force microscopy demonstrate excellent ferroelectric properties of Ba2TiO4, which allows the Ba2TiO4-based memristor to exhibit a multiresistive state under applied voltage. Synaptic characteristics such as short/long-term plasticity and paired-pulse facilitation/depression are achieved through electrical pulses. In addition, the memristor achieves nonvolatile modulation under the stimulation of optical pulses, mainly attributed to the Ba2TiO4/TiO2 heterojunction promoting the separation of photogenerated carriers. The "learning experience" process is successfully achieved, and the minimum energy consumption of a single synaptic event is only 0.051 pJ. A reservoir neural network is constructed to evaluate the reliability of Ba2TiO4/TiO2 heterojunction memristors. The recognition accuracy of the clothing data sets reaches 91.2%. Our research provides an idea for explaining the nonvolatile modulation and reservoir computing of photoelectric memristors.

Memristor

Modulation (music)

Dual mode

Photoelectric effect

Non-Volatile Memory

Mode (computer interface)

10.1021/acssuschemeng.4c05355

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Citations (2)

Spray printed conjugated polymer on tissue paper for highly sensitive pressure sensors

Polymer International (2020)

Xinhua Zhao Xiaoguang Liang Qi‐Jun Sun

Abstract Flexible pressure sensors are attracting global research interest because of their potential applications in wearable health monitoring, e‐skin and artificial intelligence. However, a multiple‐step fabrication process and sophisticated template are usually required in the construction of pressure sensing devices, which is time‐consuming and greatly increases the fabrication cost. It is highly desirable to achieve high‐performance pressure sensor devices via a simple and cost‐efficient fabrication process. Here, a flexible pressure sensor is realized by employing spray printed conductive conjugated polymer on tissue paper as the active layer. The pressure sensor shows a high pressure sensitivity of 3.3 kPa −1 in a broad detection range from 10 Pa to 10 kPa, a response time of 20 ms and a relaxation time of 30 ms. Additionally, the devices exhibit an excellent durability over 6000 loading/unloading cycles, demonstrating their great potential application in practice. With the merits of the excellent device performance of our pressure sensors, applications in wrist pulse monitoring and voice recognition are successfully demonstrated. © 2020 Society of Chemical Industry

10.1002/pi.6022

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Citations (12)

Hierarchically porous N‐doped carbon nanofibers derived from ZIF‐8/PAN composites for benzene adsorption

Journal of Applied Polymer Science (2020)

Xing Yang Xianghua Wu Zhaoyang Chen Wenqiong Li Qi‐Jun Sun

Abstract Coupling with electrospinning technique, metal–organic‐frameworks (MOFs)‐derived porous carbon fibers exhibit a great potential application in the adsorption of volatile organic compounds (VOCs) because of their huge surface area, high porosity, as well as sufficient heteroatom‐doped active sites. In this work, the hierarchically porous N‐doped carbon nanofibers are obtained after the pyrolysis of zeolite imidazole framework‐8 and polyacrylonitrile (ZIF‐8/PAN) composite fibers synthesized by electrospinning method. The N‐doped carbon nanofibers fabricated in N 2 atmosphere (N‐CF‐N 2 ) present an enhanced adsorption capacity of 694 mg/g for benzene because of the synergistic effect of the hierarchically porous structure and the abundant N‐species‐containing active sites. It is also interesting that the N‐doped hierarchical carbon nanofibers fabricated in Ar atmosphere (N‐CF‐Ar) exhibit a low benzene adsorption as compared with the N‐CF‐N 2 , which can be attributed to the porous structure damage caused by the bombardment of heavy Ar atoms on the pore shells during the pyrolysis. These results not only show a promising application of the as‐fabricated N‐CF‐N 2 in adsorption of VOCs for air purification due to its merit of cost‐efficient, large‐scale production, and excellent adsorption capacity, but also expand the potential of electrospinning technology and composite fibers in volatile organic gas adsorption.

Electrospinning

Polyacrylonitrile

Specific surface area

Carbon fibers

Heteroatom

10.1002/app.50431

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Citations (23)

Hybrid Flexible Resistive Random Access Memory‐Gated Transistor for Novel Nonvolatile Data Storage

Small (2015)

Su‐Ting Han Ye Zhou Bo Chen Chundong Wang Li Zhou

Here, a single‐device demonstration of novel hybrid architecture is reported to achieve programmable transistor nodes which have analogies to flash memory by incorporating a resistive switching random access memory (RRAM) device as a resistive switch gate for field effect transistor (FET) on a flexible substrate. A high performance flexible RRAM with a three‐layered structure is fabricated by utilizing solution‐processed MoS 2 nanosheets sandwiched between poly(methyl methacrylate) polymer layers. Gate coupling with the pentacene‐based transistor can be controlled by the RRAM memory state to produce a nonprogrammed state (inactive) and a programmed state (active) with a well‐defined memory window. Compared to the reference flash memory device based on the MoS 2 floating gate, the hybrid device presents robust access speed and retention ability. Furthermore, the hybrid RRAM‐gated FET is used to build an integrated logic circuit and a wide logic window in inverter logic is achieved. The controllable, well‐defined memory window, long retention time, and fast access speed of this novel hybrid device may open up new possibilities of realizing fully functional nonvolatile memory for high‐performance flexible electronics.

Non-Volatile Memory

Data retention

Non-volatile random-access memory

Flash Memory

10.1002/smll.201502243

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Citations (46)

Selective and sensitive onsite detection of phthalates in common solvents

Sensors and Actuators B Chemical (2017)

S. Venkatesh Chi‐Chung Yeung Qi‐Jun Sun Jiaqing Zhuang Tan Li

Molecularly imprinted polymer

Dibutyl phthalate

10.1016/j.snb.2017.12.107

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Citations (15)

Portable molecularly imprinted polymer-based platform for detection of histamine in aqueous solutions

Journal of Hazardous Materials (2020)

S. Venkatesh Chi‐Chung Yeung Tan Li Siu Chuen Lau Qi‐Jun Sun

Molecularly imprinted polymer

10.1016/j.jhazmat.2020.124609

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Citations (32)

Solution processed rare-earth doped high-k dielectrics for low-power IGZO transistors

Journal of Alloys and Compounds (2023)

Xinhua Zhao Jiaqing Zhuang Qi‐Jun Sun Zhenhua Tang Xin‐Gui Tang

High-κ dielectric

Electron Mobility

Dopant Activation

10.1016/j.jallcom.2023.170062

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Citations (5)

Neurosynaptic-like behavior of ferroelectric memristors with photoelectric dual-mode modulation

Applied Surface Science (2025)

Dong-Liang Li Xin-Gui Tang Qi‐Jun Sun Dongping Yang Yanping Jiang

Memristor

Photoelectric effect

Modulation (music)

Mode (computer interface)

Dual mode

10.1016/j.apsusc.2025.162371

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Citations (0)

Wearable Device for Monitoring Heart Rate Based on Low-Cost Piezoresistive Sensor

Vu Ngoc Quy Do Tran Xuan Duy Dinh Trung Kien Vu Hong Tu Qi‐Jun Sun

Tracking changes in heart rate plays a vital role in health care. In this work, we propose a watch-type device for heart rate monitoring, which can be comfortably worn on a wrist. This wearable device is based on a highly sensitive sensor, which is appropriate for biopressure and bioforce measurements. Results of testing measurements in the laboratory show the accuracy of the implemented device.

Piezoresistive effect

Tracking (education)

Remote patient monitoring

10.1109/mocast.2019.8741734

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Citations (9)