Article
Computer Science, Information Systems
Mayuka Tsuji, Hiroyuki Kubo, Suren Jayasuriya, Takuya Funatomi, Yasuhiro Mukaigawa
Summary: This paper presents a novel touch sensing system using a single camera for a projected screen, overcoming challenges in image processing and touch detection, achieving accurate fingertip localization, and demonstrating robustness to projected content.
Article
Engineering, Electrical & Electronic
Tae-Gyun Song, Dong-Kyu Kim, Jeong-Hyun Cho, Ji-Hun Lee, Hyun-Sik Kim
Summary: This article presents a multi-touch readout IC embedded with finger-resistance extraction (FRE) for capacitive touch screens, which successfully differentiates users and achieves reliable user differentiation through support vector machine learning.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2021)
Article
Materials Science, Ceramics
Vivekanandan Raman, Yong-Hwan Cho, Hye-Min Kim, Yong-Jun Kim, Hyeong-Min Sim, Han-Ki Kim
Summary: The development of a highly conductive, transparent, and flexible Ag mesh-like network covered by an ITO/PEDOT:PSS nanocomposite for flexible conductive electronics is reported. The electrode, deposited via solution-based deposition, achieved a lower Rs value through low-temperature plasma annealing. This low-cost electrode substantially decreased sheet resistance and provided high transmittance, while maintaining material crystallinity and preventing deformation and degradation of other components. Various tests and studies demonstrated the excellent chemical and mechanical stability of the product. Finally, the electrode was used to create transparent flexible electrical heater and capacitive touch screen panel for potential applications.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Analytical
Siheon Seong, Sewon Lee, Sunghyun Bae, Minjae Lee
Summary: This paper presents a fully-differential touch screen panel (TSP) self-capacitance sensing (SCS) system with a self-capacitance mismatch calibration technique. Due to the self-capacitance mismatch of TSP, the SNR loss for the TSP SCS system is caused by the degradation of the AFE dynamic range and gain limitations. The proposed calibration method effectively relieves the mismatch effect in terms of area and power consumption, restoring the SNR by 19.54 dB even under the worst self-capacitance mismatch case.
Article
Chemistry, Physical
Yifan Gu, Zhiguang Qiu, Simu Zhu, Hao Lu, Lisha Peng, Gaofan Zhang, Ziyi Wu, Xuchun Gui, Zong Qin, Bo-ru Yang
Summary: In this work, a patternable silver nanowire (AgNW) stretchable transparent electrode (STE) was fabricated using a plasma-enhanced cryo-transferring (PEC-transferring) process. The AgNW network achieved remarkable improvement in robustness and superior tensile electrical properties through plasma-induced sintering. Serpentine patterns were utilized to optimize the STE's tensile electrical properties, achieving a figure of merit of 292.8 and 150% resistance changing under 50% strain. Additionally, a 4 x 3 array of mutual-capacitive type stretchable touch sensors was demonstrated, showing potential for future touch sensors in stretchable devices. The PEC-transferring process opens up new possibilities for patternable embedded STEs and holds high potential for wearable electronics and Internet of Things devices.
Article
Chemistry, Multidisciplinary
Sergey Tkachev, Miguel Monteiro, Joao Santos, Ernesto Placidi, Mohamed Ben Hassine, Pedro Marques, Paulo Ferreira, Pedro Alpuim, Andrea Capasso
Summary: An efficient and inexpensive method has been proposed to produce high-quality graphene dispersions for spray-coating flexible electrodes and assembling touch screen prototypes, overcoming environmental issues associated with hazardous solvents. The combination of liquid-phase exfoliation with shear-mixing and tip sonication techniques in cyrene produces high-concentration graphene inks. The resulting electrodes exhibit low sheet resistance, high optical transmittance, high signal-to-noise ratio, and multi-touch functionality, showcasing the potential integration of LPE-graphene in commercial flexible electronics.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Jae-Sung An, Jong-Hyun Ra, Eunchul Kang, Michiel A. P. Pertijs, Sang-Hyun Han
Summary: This research presents a new technique to improve the performance of readout integrated circuits for capacitive touch-screen panels, effectively reducing charge overflow and improving signal-to-noise ratio and frame rate.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2021)
Article
Multidisciplinary Sciences
Mirza S. Sarwar, Ryusuke Ishizaki, Kieran Morton, Claire Preston, Tan Nguyen, Xu Fan, Bertille Dupont, Leanna Hogarth, Takahide Yoshiike, Ruixin Qiu, Yiting Wu, Shahriar Mirabbasi, John D. W. Madden
Summary: Soft sensors capable of differentiating shear and normal force can enhance machines' control in physical interactions with humans. The capacitive sensor, composed of patterned elastomer, distinguishes between normal force and shear using signal summation and differences. With low crosstalk and high sensitivity, this sensor shows potential for application in humanoid robotics.
SCIENTIFIC REPORTS
(2023)
Article
Neurosciences
Sophie Smit, Denise Moerel, Regine Zopf, Anina N. Rich
Summary: Simulation theories propose that vicarious touch arises when seeing someone else being touched triggers corresponding representations of being touched. Prior EEG findings show that seeing touch modulates both early and late somatosensory responses, and fMRI studies have shown that seeing touch increases somatosensory cortical activation. This study used time-resolved multivariate pattern analysis on whole-brain EEG data to test whether seen touch evokes overlapping neural representations with the first-hand experience of touch, and found that for individuals who experience vicarious touch, there is overlap in the information about touch location held in the neural patterns when seeing and feeling touch.
Article
Engineering, Chemical
Niklas Koeller, Lukas Mankertz, Selina Finger, Christian J. Linnartz, Matthias Wessling
Summary: This study presents a methodology to scale up Flow-electrode Capacitive Deionization (FCDI) technology from lab-scale to pilot-scale systems. By increasing membrane area and using a stacking approach, the FCDI modules were successfully scaled up and achieved a salt transfer rate comparable to lab-scale systems. This provides a foundation for future assessments of energy demand and economics.
Review
Engineering, Chemical
Jie Ma, Chunxiao Zhai, Fei Yu
Summary: Flow-electrode capacitive deionization (FCDI) technology overcomes the limitations of traditional CDI technology by combining flow electrodes and ion exchange membranes. Extensive research over the past decade has led to positive progress in FCDI technology, including charge transport theory, material development, and engineering applications, showing promising potential.
Article
Biophysics
Xinran Wang, Xiaozhou Li, Xuxuan Yang, Kai Lei, Lin Wang
Summary: This study successfully developed a method for preparing a protective film for touch screen panels with UV absorption and antibacterial properties, and fabricated multifunctional protective films. The films not only exhibited excellent performances, but also possessed good water resistance, abrasion resistance, self-healing capabilities, and high adhesion.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2021)
Article
Engineering, Environmental
Hahnsoll Rhee, Rhokyun Kwak
Summary: Exposure of a conducting porous material to an electric field in electrolytes induces an electric dipole, resulting in capacitive charging of cations and anions at opposite poles. A novel desalination method using this induced-charge capacitive deionization (IC-CDI) is investigated, and a microscale IC-CDI platform is devised to study ion transport dynamics and desalination performances compared to conventional CDI.
Article
Nanoscience & Nanotechnology
Lin Xu, Ying Pan, Xuanqi Wang, Zhijun Xu, Huasheng Tian, Yue Liu, Xiaodan Bu, Houchao Jing, Tianyu Wang, Yaqing Liu, Minghua Liu
Summary: In this study, a lithium ion-triggered gelation strategy was designed to produce a molecular hydrogel with thixotropy, which can be mechanically recycled or reconfigured at room temperature. The hydrogel utilizes lithium ions to construct supramolecular nanoassemblies and charge carriers for ionic conductivity. Additionally, polymer additives were used to improve the mechanical flexibility of the hydrogel for daily use in touch panels. This work sheds light on enhancing the functionalities of hydrogel-based ionotronics through a supramolecular approach.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Marcus A. Hintermueller, Christina Offenzeller, Bernhard Jakoby
Summary: Microfluidic co-flow viscometers use capacitive measurements instead of optical means to determine interface position, with a device fabricated from simple processes for a fully polymeric microfluidic chip and screen-printed capacitive sensor, eliminating the need for coloring liquids or tracer particles.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Xiaotao Xu, Xuesong Yuan, Qingyun Chen, Matthew T. Cole, Yu Zhan, Jie Xie, Yong Yin, Hailong Li, Yang Yan
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2020)
Article
Engineering, Electrical & Electronic
Yunlong Gu, Xuesong Yuan, Xiaotao Xu, Matthew Cole, Qingyun Chen, Yu Zhang, Bin Wang, Hailong Li, Yong Yin, Yang Yan
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2020)
Article
Engineering, Electrical & Electronic
Xuesong Yuan, Qingyun Chen, Xiaotao Xu, Matthew T. Cole, Yu Zhang, Zexiang Chen, Yang Yan
Summary: The study reports the development of a CNT cold-cathode Ka-band backward-wave oscillator (BWO) with unprecedentedly high output power of 230 W. A novel beam compression stage was used, along with a magnetic injection electron gun achieving high emission and focused beam current density, essential for the BWO's high output power.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Nanoscience & Nanotechnology
Yifan Zu, Xuesong Yuan, Xiaotao Xu, Qingyun Chen, Matthew Cole, Yong Yin, Liangjie Bi, Hailong Li, Bin Wang, Lin Meng, Yang Yan
Summary: Based on a disk-loaded coupled cavity structure operating in the quasi-TM03 mode, a high electron efficiency, high output power terahertz radiation source was developed in this study. By concentrating the axial field energy within a large cavity, efficient energy conversion between the electron beam and the high frequency field was achieved. The new design approach can achieve kilowatt-level output power at 0.22 THz with a high electron efficiency of 11.5%, as demonstrated by particle in cell simulations.
Review
Chemistry, Multidisciplinary
Shenghan Zhou, Ke Chen, Matthew Thomas Cole, Zhenjun Li, Mo Li, Jun Chen, Christoph Lienau, Chi Li, Qing Dai
Summary: The search for higher frequency information processing has led to intense research in micro, nano, and optoelectronics, with electron tunneling devices offering significantly faster response times compared to conventional semiconductor devices. This enhanced performance is driving the reimagination of traditional electronic devices and the emergence of new lightwave electronics. The current state-of-the-art, challenges, and opportunities in electron tunneling devices are reviewed, alongside potential future research directions in this rapidly advancing field.
ADVANCED MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Qingyun Chen, Xuesong Yuan, Xiaotao Xu, Yu Zhang, Matthew T. Cole, Yifan Zu, Zexiang Chen, Yong Yin, Hailong Li, Lin Meng, Yang Yan
Summary: We developed an improved dual-gridded electron gun with a carbon nanotube cold cathode, which enhances electron beam transparency and reduces grid interception and loss pathways. Experimental results show that this electron gun can support high output currents, has high transparency and good beam spot characteristics, and exhibits strong stability.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Xiaotao Xu, Xuesong Yuan, Hailong Li, Qingyun Chen, Yifan Zu, Matthew Cole, Jie Xie, Yong Yin, Yang Yan
Summary: In this study, a large-sized G-band extended interaction Klystron with a four-cavity beam tunnel structure is proposed. By optimizing the coupling cavity, sufficient beam-wave interaction is ensured. Simulation results show that the Klystron achieves high output power, gain, and efficiency.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Multidisciplinary Sciences
Daniel Popa, Richard Hopper, Syed Zeeshan Ali, Matthew Thomas Cole, Ye Fan, Vlad-Petru Veigang-Radulescu, Rohit Chikkaraddy, Jayakrupakar Nallala, Yuxin Xing, Jack Alexander-Webber, Stephan Hofmann, Andrea De Luca, Julian William Gardner, Florin Udrea
Summary: The gas sensor market is rapidly growing due to various socioeconomic and industrial factors, with a particular demand for high-performance MIR gas sensors in healthcare, smart homes, and the automotive sector. Researchers have developed an on-chip broadband thermal MIR source based on CMOS technology and a CNT blackbody layer, offering an ideal solution for low-cost, highly-integrated MIR spectroscopy.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Jianfeng Xiao, Jiuzhou Zhao, Guanjiang Liu, Mattew Thomas Cole, Shenghan Zhou, Ke Chen, Xinchuan Liu, Zhenjun Li, Chi Li, Qing Dai
Summary: The study successfully demonstrates the fabrication of well-aligned, vertically orientated SiC nanoarrays using reactive ion etching. The resulting nanoarrays exhibit high geometry uniformity and excellent field emission performance, showing potential for various vacuum electronics applications.
Article
Chemistry, Multidisciplinary
Jiuzhou Zhao, Zhenjun Li, Matthew Thomas Cole, Aiwei Wang, Xiangdong Guo, Xinchuan Liu, Wei Lyu, Hanchao Teng, Yunpeng Qv, Guanjiang Liu, Ke Chen, Shenghan Zhou, Jianfeng Xiao, Yi Li, Chi Li, Qing Dai
Summary: This study developed a UV laser beam patterning technique to reliably fabricate nanocone-shaped carbon nanotubes field-emitter array (NCNA) with a cone-tip radius of approximately 300 nm, providing smaller turn-on fields and higher and more stable emission in emitters compared to unpatterned counterparts. This technique may be widely applied in the fabrication of high-performance CNTs field-emitter arrays.
Article
Chemistry, Multidisciplinary
Shenghan Zhou, Xiangdong Guo, Ke Chen, Matthew Thomas Cole, Xiaowei Wang, Zhenjun Li, Jiayu Dai, Chi Li, Qing Dai
Summary: The empirical findings on the high nonlinearity in metal-insulator-metal (MIM) nanojunctions driven by ultrafast optical pulses in the strong optical-field regime indicate a significant technological breakthrough. This work establishes important foundations for the development of a new generation of ultracompact and ultrafast electronics devices that operate with suboptical-cycle response times.
Article
Engineering, Electrical & Electronic
Yifan Zu, Ying Lan, Xuesong Yuan, Xiaotao Xu, Qingyun Chen, Hailong Li, Matthew T. Cole, Yong Yin, Bin Wang, Lin Meng, Yang Yan
Summary: In this paper, a complete design process of a highly overmoded slow wave circuit (SWC) operating in the quasi-TM04 mode for terahertz (THz) extended interaction oscillator (EIO) is presented. The interaction circuit emits THz frequency electromagnetic radiation through engineered millimeter-wave (MMW) circuits, overcoming the engineering challenges caused by circuit size limitation. By carefully engineering the electron optical system, a cylindrical beam with a diameter of 0.38 mm and a current of 0.25 A is obtained at a bias of 14.8 kV. Through particle in-cell (PIC) simulation, it is shown that these new design approaches achieve an output power of 250 W at 0.3 THz in a cylindrical cavity with an inner diameter of 4.16 mm.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Yifan Zu, Xuesong Yuan, Xiaotao Xu, Hailong Li, Qingyun Chen, Matthew Thomas Cole, Lin Meng, Yang Yan
Summary: This article presents the development of a highly overmoded structure for a millimeter-wave extended interaction klystron. A new method for designing an oversized beam tunnel in a large cavity by concentrating the axial field is demonstrated to enhance electron beam loading. The transmission and oscillation characteristics of the interaction circuit operating in the quasi-TM04 mode are tested using the developed mode conversion circuit. Results show that a five-cavity EIK based on this highly overmoded structure can achieve an output power of 289 kW at 32.92 GHz with a saturated gain of 51.6 dB by injecting a 3.3 mm diameter electron beam with a current of 18 A. The output power exceeds 100 kW at a bandwidth of 100 MHz.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Materials Science, Multidisciplinary
Fangzhu Xiong, Jie Sun, Matthew T. Cole, Weiling Guo, Chunli Yan, Yibo Dong, Le Wang, Zaifa Du, Shiwei Feng, Xuan Li, Tailiang Guo, Qun Yan
Summary: This study introduces a semiconductor industry compatible technique for the in situ growth of patterned graphene directly onto GaN LED epiwafers. By using pre-patterned sacrificial Co and plasma enhancement in the graphene chemical vapor deposition process, high-quality graphene can be grown at a low temperature. This approach simplifies the fabrication process, eliminates the bottlenecks of graphene transfer and patterning procedures, and improves the device's optical, electrical, and thermal performances.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Shenghan Zhou, Ke Chen, Xiangdong Guo, Matthew Thomas Cole, Yu Wu, Zhenjun Li, Shunping Zhang, Chi Li, Qing Dai
