Article
Chemistry, Physical
Wen Chen, Han Xiao, Xufeng Zhou, Xueyan Xu, Shunqiong Jiang, Zhihong Qin, Shiyun Ding, Cancan Bian, Zhaoping Liu
Summary: Graphene films have high electrical conductivity and good mechanical strength, making them ideal for use in supercapacitors. However, their low elastic deformation ability limits their application in stretchable supercapacitors. By combining graphene with a conductive polymer hydrogel, the resulting composite film exhibits improved ductility and higher specific capacitance. A proof-of-concept planar supercapacitor using this graphene-conductive polymer hydrogel composite film as electrodes retains excellent electrochemical performance even under stretching conditions.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Hanping Xu, Jingqiao Zhu, Tao Zhao, Qiangli Hu, Mincai Xu, Zijie Lei, Xiaojuan Jin
Summary: In this study, a flexible membrane electrode with good mechanical properties and high electrical conductivity was synthesized using carboxymethylcellulose and polymer. The electrochemical performance of the membrane was enhanced through further treatment. The assembled supercapacitor showed high energy density at high power density and had an ultra-long cycle life.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
Ana M. Diez-Pascual
Summary: PEDOT:PSS/SnO2 nanocomposites prepared by a simple, low-cost, environmentally friendly method show improved thermal stability, electrical conductivity, and Seebeck coefficient compared to neat PEDOT:PSS, while maintaining almost unchanged optical transparency. These sustainable nanocomposites have potential for applications in energy storage, flexible electronics, and thermoelectric devices.
Article
Engineering, Environmental
Tao Liu, Chenyang Li, Huichao Liu, Shuo Zhang, Jinglong Yang, Jie Zhou, Jiali Yu, Muwei Ji, Caizhen Zhu, Jian Xu
Summary: This study presents a novel supercapacitor design based on Ag-coated Tyvek substrate, demonstrating high flexibility, tear resistance, stability, and energy density. The prepared supercapacitor exhibits large capacity and maintains high stability at a scan rate of 50mV/s. This work advances the research on Tyvek-based supercapacitors for flexible energy storage devices.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Polymer Science
Lucija Fiket, Marin Bozicevic, Lana Brkic, Patricia Zagar, Anamarija Horvat, Zvonimir Katancic
Summary: This study aimed to synthesize an intrinsically stretchable conductive polymer by atom transfer radical polymerization. The synthesized PEDOT-g-PAU showed high stretchability and has potential applications in skin-worn flexible electronics. However, additional doping is needed to improve the electrical properties.
Article
Engineering, Electrical & Electronic
Yasin Altin, Ayse Celik Bedeloglu
Summary: By dip-coating carbon nanofibers with PEDOT:PSS, the specific capacitance and diameter of the nanofibers are increased. The resulting hybrid electrode is suitable for various energy storage applications, particularly supercapacitors. The dip-coating method is simple, fast, and suitable for large-scale production.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Composites
Xin Jiang, Yihu Song, Wanjie Wang, Qiang Zheng
Summary: This study introduces silica as a secondary filler in PEDOT:PSS/NR nanocomposites films to improve stability of electrical properties and decrease the change of Seebeck coefficient after deformation, offering a simple strategy for preparing stretchable conductors with enhanced stability.
COMPOSITES COMMUNICATIONS
(2022)
Article
Energy & Fuels
Wei Li, Huaxin Wang, Xiaofei Hu, Wensi Cai, Cong Zhang, Ming Wang, Zhigang Zang
Summary: In this research, the addition of sodium benzenesulfonate (SBS) to modify PEDOT:PSS layer improved the performance of perovskite solar cells (PSCs) by enhancing energy-level alignment, reducing charge recombination, and increasing grain size and crystallinity of the perovskite film. This modification led to an increase in the power conversion efficiency (PCE) and open-circuit voltage (V-OC) of the inverted PSCs. Furthermore, the unencapsulated PSCs remained highly efficient even after 20 days of storage in ambient conditions.
Article
Chemistry, Physical
Nikola Lenar, Robert Piech, Beata Paczosa-Bator
Summary: The combination of ruthenium dioxide and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate in a composite material significantly enhanced the electrical and analytical parameters of potassium selective electrodes. The fast and easy preparation method, along with the high electrical capacitance of the composite material, led to great performance of the designed K+-selective sensors. The electrodes exhibited fast and stable potentiometric responses in a wide range of potassium ion concentrations, with the highest reported electrical capacitance for this type of sensor.
Article
Energy & Fuels
Shahid Bashir, Maryam Hina, Javed Iqbal, Rashida Jafer, S. Ramesh, K. Ramesh
Summary: Composite hydrogel electrolytes were developed using Na-MMT as a crosslinking agent and MgTf2 as an ionic source, with the addition of PEDOT:PSS to enhance conductivity, showing potential for use in supercapacitors.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Materials Science, Multidisciplinary
Chin-Tai Chen, Zhe-Hao Zhang
Summary: Transparent conductive materials and films at nanometer scales have been studied for industrial applications like optical detectors, displays, and solar cells, with recent advancements in emerging nanomaterials further enhancing their properties. A low-pressure droplet-evaporation deposition method using dual spray of PEDOT:PSS and graphene solutions in a vacuum environment has been shown to produce composite films with higher conductivity than single component ones, providing the capability to control conductivity and transmittance for applications in flexible displays and solar cells.
Article
Engineering, Biomedical
Miriam Seiti, Paola Serena Ginestra, Rosalba Monica Ferraro, Silvia Giliani, Rosaria Maria Vetrano, Elisabetta Ceretti, Eleonora Ferraris
Summary: This study proposes the use of Aerosol Jet (R) Printing technology to develop integrated devices for neural tissue engineering (NTE) that can provide topographical, electrical, mechanical, and/or biochemical stimulations for regulating neural cell activities. The experiment shows that the printed electrodes have the expected electrical resistance and the final circuit has the anticipated electrical impedance. However, the commercial PEDOT:PSS ink used in the experiment demonstrates dose-dependent cytotoxic behavior, which is likely caused by a cytotoxic co-solvent in the ink's formulation.
INTERNATIONAL JOURNAL OF BIOPRINTING
(2022)
Article
Materials Science, Multidisciplinary
Yuanmin Zhang, Yuqi Chen, Sonia Contera, Richard G. Compton
Summary: Poly(3,4-ethylenedioxythiophene) (PEDOT), a conducting polymer, is used to coat metal neural electrodes for improved performance. However, PEDOT-coated electrodes often suffer from mechanical instability. This study systematically evaluates the electropolymerization and surface morphology of PEDOT:PSS, optimizing the deposition for recording neural electrodes. The modified electrodes demonstrate good electrochemical performance without triggering redox reactions.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Analytical
Olesya Daikos, Mirko Naumann, Katrin Ohndorf, Carsten Bundesmann, Ulrike Helmstedt, Tom Scherzer
Summary: This research used hyperspectral imaging to determine the thickness of thin layers of the conductive polymer PEDOT:PSS, predicted thickness data using a chemometric approach, and established a calibration model with high accuracy. The method was validated for quantitative imaging of thickness distribution in thin layers.
Article
Materials Science, Characterization & Testing
Yihan Wang, Siqi Wu, Qinjian Yin, Bo Jiang, Site Mo
Summary: The study on poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)/polyaniline (PEDOT:PSS/PANi) composite films shows that the nanostructured PANi, particularly nanoflakes, with planar molecule structure lead to the best crystallinity and highest thermoelectric properties. Additionally, the interaction between PEDOT and PANi in the composite films significantly enhances the electrical conductivity, highlighting the importance of their arrangement in influencing the overall performance.
Article
Chemistry, Multidisciplinary
Woosik Kim, Su-Kyung Kim, Sanghyun Jeon, Junhyuk Ahn, Byung Ku Jung, Sang Yeop Lee, Chanho Shin, Tae-Yeon Seong, Sohee Jeong, Ho Seong Jang, TSe Nga Ng, Soong Ju Oh
Summary: This study presents a solution-based patterning method for perovskite, overcoming the incompatibility with photolithography processes. The results show successful synthesis of CsPbBr3 and Cs4PbBr6 with excellent optoelectronic properties, and the fabrication of high-resolution photoconductor arrays and luminescent pattern arrays on various substrates. This research demonstrates the potential of perovskite in applications such as image sensors and displays.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Chanho Shin, Lulu Yao, Haichen Lin, Ping Liu, Tse Nga Ng
Summary: This work studies a new gel polymer electrolyte (GPE) for photothermal supercapacitors operating over a wide temperature range. The GPE effectively improves ionic conductivity and reduces impurity diffusion, minimizing energy loss in hot environments. In cold settings, the devices are packaged with a photothermal conversion layer to increase cell temperature and enhance energy density. The combination of the improved GPE and photothermal conversion extends the operational time of a motor driven from a cold start by a supercapacitor, showing high-performance design for harsh environments.
ACS ENERGY LETTERS
(2023)
Article
Multidisciplinary Sciences
Lulu Yao, Kai Zheng, Nandu Koripally, Naresh Eedugurala, Jason D. Azoulay, Xinyu Zhang, Tse Nga Ng
Summary: Structural supercapacitors integrate load-bearing and energy-storage functions, resulting in weight savings and safety improvements. Strategies based on interfacial engineering were developed to enhance multifunctional efficiency. By coating carbon-fiber weaves with a stable conjugated redox polymer and reduced graphene oxide, the structural electrodes exhibited increased capacitance and tensile strength. The gradient configuration of the solid polymer electrolyte allowed for high ionic conductivity at the electrode-electrolyte interfaces and high mechanical strength for load support. The multilayer structural supercapacitors achieved state-of-the-art performance and demonstrated durability under mechanical loads.
Article
Chemistry, Multidisciplinary
Shaurya Arya, Yunrui Jiang, Byung Ku Jung, Yalun Tang, Tse Nga Ng, Soong Ju Oh, Kenji Nomura, Yu-Hwa Lo
Summary: In this study, a compact and easy-to-use model for colloidal quantum dot (CQD) devices is developed. By considering the properties of quantum dots, ligand binding, and the heterointerface between quantum dots and the electron transport layer, the model can accurately describe and optimize the performance of CQD devices.
Article
Chemistry, Multidisciplinary
Shuo-En Wu, Longhui Zeng, Yichen Zhai, Chanho Shin, Naresh Eedugurala, Jason D. Azoulay, Tse Nga Ng
Summary: Organic retinomorphic sensors, equipped with in-sensor processing to eliminate static backgrounds, are ideal for motion detection. The study focuses on the role of interfacial energetics in enhancing the inherent photoresponse of light-sensitive capacitors by promoting charge accumulation. Incorporating appropriate interfacial layers around the photoactive layer is crucial to extend the carrier lifetime, leading to improved detectivity and response speed compared to traditional photodiodes, thanks to the additional insulating layer. Integration of three retinomorphic sensors in a line array demonstrates efficient motion tracking capabilities.
Article
Materials Science, Multidisciplinary
Laura L. Becerra, Tarek Rafeedi, Sankaran Ramanarayanan, Ian Frankel, Juliana Miller, Alexander X. Chen, Yi Qie, Darren J. Lipomi, Harinath Garudadri, Tse Nga Ng
Summary: A portable venturi tube for measuring bidirectional respiratory flow is developed and correlated with pulmonary function. Capacitive foam sensors embedded into the wall of the device transduce pressure signals to provide differential pressure readings, extrapolating airflow rate. The 3D-printed spirometer tube, designed using the venturi effect, accurately measures tidal breathing, deep breathing, and peak expiratory flow rates, offering point-of-care diagnoses and potential improvements in respiratory illness care.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Editorial Material
Engineering, Electrical & Electronic
Chanho Shin, Tse Nga Ng
Summary: A skin-conformable system worn on the finger, combining optical sensors with memristors, is able to accurately categorize finger-written inputs in three-dimensional space.
NATURE ELECTRONICS
(2023)
Proceedings Paper
Computer Science, Hardware & Architecture
Kun Qian, Lulu Yao, Kai Zheng, Xinyu Zhang, Tse Nga Ng
Summary: Millimeter-wave backscatter is a prominent technical evolution in next-generation wireless systems, supporting both high-precision sensing and massive communication. This paper introduces UniScatter, a new backscatter tag structure based on metamaterials, which achieves consistent electromagnetic responses across a wide frequency range and wide angular field-of-view. Field tests demonstrate that UniScatter can backscatter signals across a wide frequency band from 24 GHz to 77 GHz with consistently high signal strength and wide angular coverage in 3D space.
PROCEEDINGS OF THE 29TH ANNUAL INTERNATIONAL CONFERENCE ON MOBILE COMPUTING AND NETWORKING, MOBICOM 2023
(2023)
Article
Chemistry, Multidisciplinary
Mingwan Leng, Nandu Koripally, Junjie Huang, Aikaterini Vriza, Kyeong Yeon Lee, Xiaozhou Ji, Chenxuan Li, Megan Hays, Qing Tu, Kim Dunbar, Jie Xu, Tse Nga Ng, Lei Fang
Summary: This article introduces a new class of conductive polymers with a fully ladder-type backbone. A low-defect ladder polymer is synthesized through a molecular design strategy, which can be efficiently oxidized and acid-doped to achieve conductivity. The polymer's structure and open-shell nature are elucidated with the help of studies on small molecular models. An autonomous robotic system is used to optimize the conductivity of the polymer thin film, achieving over 7 mS cm(-1). The polymer demonstrates unparalleled stability in strong acid and under harsh UV-irradiation, surpassing commercial benchmarks like PEDOT:PSS and polyaniline.
MATERIALS HORIZONS
(2023)
Article
Engineering, Electrical & Electronic
Ning Li, Xin Hu, Xiubao Sui, Qian Chen, Tse Nga Ng
Summary: This decade has witnessed significant progress in the field of infrared light sensing and imaging, characterized by the utilization of innovative materials and deliberate structural designs. Organic semiconducting materials show great promise in next-generation infrared sensing applications due to their unique properties such as solution processability, tunable optoelectronic property, and biocompatibility. This Spotlight article aims to provide an overview of recent advances in organic infrared light detection technology beyond 1000 nm, focusing on enhancing performance and realizing new functions. Several innovative proof-of-concept demonstrations showcase the advantages of this rapidly advancing technology. Finally, we discuss the challenges and prospects of organic infrared technology.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Ning Li, Xin Hu, Xiubao Sui, Qian Chen, Tse Nga Ng
Summary: This article summarizes the rapid development of organic infrared light detection technology in the past decade, including innovative materials and deliberate structural designs. Organic semiconducting materials are promising for the next-generation infrared sensing applications due to their unique properties. The article focuses on performance enhancements and new function realizations for wavelengths beyond 1000 nm, presenting innovative proof-of-concept demonstrations to illustrate the benefits of organic infrared technology. Finally, the challenges and perspectives of organic infrared technology are discussed.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Bogyeom Seo, Jusung Chung, Naresh Eedugurala, Jason D. Azoulay, Hyun Jae Kim, Tse Nga Ng
Summary: This study demonstrates the integration of an organic bulk heterojunction polymer layer on an oxide thin-film transistor to achieve high-efficiency photodetection in the short-wave infrared region. By using trap-assisted charge injection, the organic semiconductor's photoresponse at longer wavelengths is enhanced. The detector performance is optimized by investigating the balance between bias stress and signal-to-noise under different bias conditions, resulting in a responsivity at 1550 nm up to 130 mA/W at a low light intensity.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Automation & Control Systems
Yichen Zhai, Tse Nga Ng
Summary: This study applies a biomimetic strategy of combining soft actuators with an exoskeleton to create self-sustained robots for transportation in unsupervised environments. The robot uses liquid crystal elastomers for soft actuation components and polycarbonate for the exoskeleton. It achieves self-sustained locomotion, high load capacity, and climbing ability without the need for external controls or complex electronics.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Chemistry, Multidisciplinary
Chanho Shin, Ning Li, Bogyeom Seo, Naresh Eedugurala, Jason D. Azoulay, Tse Nga Ng
Summary: This study presents a new interlayer design that simultaneously achieves photomultiplication and suppresses dark current in organic shortwave infrared detectors, improving the overall detectivity. The new design is generalizable to work with different organic semiconductors, making it attractive and easy to integrate with emerging organic infrared systems.
MATERIALS HORIZONS
(2022)
Article
Chemistry, Multidisciplinary
Ning Li, Naresh Eedugurala, Jason D. Azoulay, Tse Nga Ng
Summary: The study presents a design for a compact dual-band photodetector based on the integration of two back-to-back organic photodiodes. The detector can switch between visible and infrared detection modes at low voltage, and exhibits fast response and high detectivity, making it suitable for object identification and high temperature measurements.
CELL REPORTS PHYSICAL SCIENCE
(2022)
