Article
Chemistry, Multidisciplinary
Xueqing Liu, Trond Ytterdal, Michael Shur
Summary: This paper presents an update of the RPI thin-film transistor (TFT) compact model, which accurately describes the gate voltage-dependent channel layer thickness and allows for terahertz frequency simulations. The model introduces two subthreshold ideality factors to control the gate voltage and its effect on the current and capacitance. The updated model reproduces the conventional model at low frequencies, fits measured data accurately, and extends the application of the model to the terahertz frequency range.
Review
Physics, Applied
Mahpara Habib, Iza Lantgios, Katherine Hornbostel
Summary: This review provides an overview and evaluation of piezoelectric materials, focusing on their application in piezoelectric energy harvesters and sensors. The three main classes of piezoelectric materials, ceramics, polymers, and composites, are examined and compared, and their suitability for different applications is discussed.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
R. A. P. Altafim, Y. A. O. Assagra, R. A. C. Altafim, J. P. Carmo, T. T. C. Palito, A. M. Santos, D. Rychkov
Summary: Electrically charged porous electret films, known as ferroelectrets or piezoelectrets, have gained attention for their high piezoelectric activity, low density, and flexibility. This paper introduces a ferroelectret design for developing piezoelectric-magnetic responses, where additional magnetic layers are added on electret films to monitor charge density variation. The piezoelectric-magnetic effect results from mechanical deformation caused by external magnetic force with measurements ranging from 94 up to 275 pC T-1.
APPLIED PHYSICS LETTERS
(2021)
Review
Engineering, Biomedical
Mohsin Ali, Mohammad Javad Bathaei, Emin Istif, Seyed Nasir Hosseini Karimi, Levent Beker
Summary: Recent advancements in biodegradable piezoelectric materials, including natural and synthetic polymers, have led to the development of exciting bioelectronic devices that can be easily integrated with biological systems for various applications in the biomedical field. These materials, with desired electrical and mechanical properties, hold great potential for wearable and implantable bioelectronics, enabling sensing of physiological signals, medical diagnostics, blood-brain barrier opening, and tissue healing or growth stimulation. This review thoroughly investigates the principles, advanced applications, challenges, and degradation methods of these materials through in vitro and in vivo studies, highlighting the importance of these advancements in enabling new opportunities for materials research.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Multidisciplinary Sciences
Yuanjie Su, Weixiong Li, Xiaoxing Cheng, Yihao Zhou, Shuai Yang, Xu Zhang, Chunxu Chen, Tiannan Yang, Hong Pan, Guangzhong Xie, Guorui Chen, Xun Zhao, Xiao Xiao, Bei Li, Huiling Tai, Yadong Jiang, Long-Qing Chen, Fei Li, Jun Chen
Summary: This study proposes a Ti3C2Tx anchoring method to modulate the molecular interactions and conformation of the polymer matrix, enhancing the piezoelectric response of polymer-ceramic composites. The interfacial bonding strategy is translated into electrospinning to produce high-performance piezoelectric nanofibers, which can be integrated into shoe insoles for gait monitoring and foot pain prognosis.
NATURE COMMUNICATIONS
(2022)
Review
Engineering, Biomedical
Kuntal Kumar Das, Bikramjit Basu, Pralay Maiti, Ashutosh Kumar Dubey
Summary: Piezoelectric nanogenerators (PENGs) hold great promise in personalized healthcare, providing self-powered sensors, drug delivery systems, and tissue regeneration. This comprehensive review examines the recent advancements in synthetic and nature-inspired piezoelectric materials for PENGs and discusses the potential of these materials and data science approaches to enhance personalized healthcare devices.
ACTA BIOMATERIALIA
(2023)
Article
Chemistry, Multidisciplinary
Francis Owusu, Frank A. Nueesch, Dorina M. Opris
Summary: Researchers have successfully synthesized an all-organic piezoelectric elastomer with high piezoelectricity and high elasticity. By blending high Tg polar polynorbornene nanoparticles with a chemically cross-linked polydimethylsiloxane matrix, and then poling and processing the material, it exhibits a stable and reversible piezoelectric response.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Thijs Ullrick, Domenico Spina, Wim Bogaerts, Tom Dhaene
Summary: A novel wideband parametric baseband macromodeling technique is proposed for passive photonic devices and circuits. The technique allows for efficient estimation and simulation of the system by using rational models derived from interpolation and scaling. It also enables the simulation of multi-wavelength systems.
SCIENTIFIC REPORTS
(2023)
Article
Polymer Science
Pedro Llovera-Segovia, Gustavo Ortega-Brana, Vicente Fuster-Roig, Alfredo Quijano-Lopez
Summary: Piezoelectric polymer cellular films have been developed and improved based on inducing discharges in the gas inside the cells to polarize internal cells. Charging methods, including corona discharge and non-corona discharge, have been explored to achieve high piezoelectric coefficients in the materials. Experimental results show good homogeneity on the surface and high d(33) constants have been obtained.
Article
Materials Science, Multidisciplinary
Wangwei Lian, Mengxia Zhang, Jie Wang, Chenchen Wu, Khalid Lamnawar, Abderrahim Maazouz, Bo Lu, Binbin Dong, Chuntai Liu
Summary: Polymeric piezoelectric nanogenerators (PENGs) are fabricated by incorporating a tailormade interfacial coupling agent, PVDF-g-MA, onto PVDF/CNTs interfaces. This mild interface-engineering strategy improves interfacial interactions and stabilizes electrospinning flow jets for defect-free nanofibers. The interfacial anchoring of PVDF-g-MA molecules promotes the preferential crystallization of the electroactive β-phase within the PVDF matrix, enhancing piezoelectric outputs while maintaining flexibility.
Article
Chemistry, Multidisciplinary
Lizhou Li, Xiaoli Wang, Yanqiang Hu, Zhihao Li, Chenfei Wang, Zirui Zhao
Summary: This study investigates the mechanism of ferroelectric polymer-metal contact electrification through first-principles calculations, revealing that charge transfer occurs not only at the interface but also inside the polymer. The presence of polar phases enhances charge transfer between the ferroelectric polymer and metal, providing a theoretical basis for the design of triboelectric nanogenerators based on ferroelectric polymers. Additionally, the coupling mechanism of piezoelectricity and triboelectricity in ferroelectric polymer-metal contact electrification under compression is explored, showing that deformation increases charge transfer between the polar molecular chains of PVDF and the metal.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Computer Science, Information Systems
Xinhuan Yang, Qianqian Sang, Jianyu Zhang, Shuo Wang, Chuanzheng Wang, Mingyan Yu, Yuanfu Zhao
Summary: In order to consider the aging effect on circuit performance in the early design stage, an accurate aging simulation model needs to be established. However, there is a significant discrepancy in the reverse deduction of MOSFET transistor degradation from the aging model. To address this problem, this paper proposes a method that establishes the conversion relationship between simulation parameters and the degradation of MOSFET transistor parameters. The degradation values are converted into model parameters that characterize the aging effect in SPICE, and the results show an improvement in aging simulation accuracy to within 0.1%, which greatly facilitates circuit reliability simulation and analysis. Finally, the aging effect on the ring oscillator circuit is analyzed using the model.
Article
Materials Science, Multidisciplinary
Vincent Bouad, Alexandre Fadel, Saj Mohan, Arthur Hamieh, Jean-Francois Tahon, Joel Lyskawa, Patrice Woisel, Antonio Da Costa, Anthony Ferri, Rachel Desfeux, Freddy Ponchel, Denis Remiens, Vincent Ladmiral, Sophie Barrau
Summary: This study presents an approach to improve the interfacial adhesion between piezoelectric ceramics and piezoelectric polymer matrix in composites, using a macromolecular coupling agent. The macromolecular coupling agent, PMMA-DA, was successfully synthesized and grafted onto the surface of a lead-free piezoelectric ceramic film. The resulting composite showed improved cohesion and a strong piezoelectric response.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Junyuan Tian, Fengying Jiang, Qinghang Zeng, MohammadJavad PourhosseiniAsl, Congzheng Han, Kailiang Ren
Summary: With the development of wearable devices and the Internet of Things (IoT), there is a growing demand for portable and comfortable human health monitoring devices. In this investigation, poly(L-lactic acid) (PLLA) film was fabricated for the first time for real-time wearable stethoscope and pulse wave sensor applications. The PLLA film-based devices showed stable frequency response, biodegradability, and temperature stability, indicating great potential for wearable human health monitoring devices.
IEEE SENSORS JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Bidya Mondal, Ranjini Sarkar, Dalip Saini, Varun Gupta, Tarun Kumar Kundu, Dipankar Mandal
Summary: In this study, a three-layer assembled wearable piezoelectric nanogenerator (PENG) was fabricated using Cs3Bi2I9-PVDF nanofiber as the active component and PEDOT-coated PVDF nanofiber mats as the electrodes. The incorporation of perovskite Cs3Bi2I9 fillers induced the formation of β-phase in the PVDF matrix. The PENG showed high open circuit voltage, short circuit current, and power density, as well as excellent breathability, flexibility, water-resistive properties, and mechanoacoustic sensitivity.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Yogeenth Kumaresan, Sihang Ma, Oliver Ozioko, Ravinder Dahiya
Summary: In this study, an innovative approach was proposed to achieve a highly sensitive capacitive pressure sensor by introducing a zinc oxide nanowire interlayer in the conventional metal-insulator-metal architecture. The zinc oxide nanowire interlayer significantly enhanced the performance of the sensor, resulting in a 7-fold increase in sensitivity at a low-pressure range. The improvement in sensitivity was attributed to enhanced charge separation and electric dipole generation due to the displacement of zinc and oxygen atoms under applied pressure.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Chang Sheng Lee, Minghui Li, Yaolong Lou, Ravinder Dahiya
Summary: This article proposes a hybrid technique combining wavelet-based total variation (WATV) and empirical Wiener denoising method to enhance the signal-to-noise ratio (SNR) of lung sound signals. The technique takes into account both significant and insignificant wavelet coefficients of the noisy signal, resulting in improved SNR compared to state-of-the-art filters. The proposed method achieves an improvement of 3-20 dB in SNR, and is less sensitive to the variation of SNR values. The technique also shows similar SNR performance for different types of lung sound signals in simulation and experimental studies.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Analytical
Ajay Beniwal, Priyanka Ganguly, Akshaya Kumar Aliyana, Gaurav Khandelwal, Ravinder Dahiya
Summary: This article presents a flexible, cost-effective, and disposable humidity sensor developed on a paper substrate. The sensor demonstrates good sensing performance, high flexibility, stability, repeatability, short response/recovery time, and good reproducibility. The sensor's efficacy is evaluated for spatial humidity monitoring, respiration rate monitoring, and soil moisture monitoring, showing its potential applications in environmental, agricultural, and healthcare fields.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Nanoscience & Nanotechnology
Adamos Christou, Sihang Ma, Ayoub Zumeit, Abhishek Singh Dahiya, Ravinder Dahiya
Summary: Flexible hybrid electronics (FHE) offers potential for fast computation and communication in various applications. This study presents a printed electronics route for integrating ultrathin chips and nanowires-based electronic layers on the same substrate. The results demonstrate the efficacy of the printing technique in achieving this integration and the superior performance of the printed electronic layers.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Computer Science, Information Systems
Guido Di Patrizio Stanchieri, Moustafa Saleh, Andrea De Marcellis, Ali Ibrahim, Marco Faccio, Maurizio Valle, Elia Palange
Summary: In this paper, a tactile sensory feedback system for prosthetic applications based on an optical communication link is proposed and validated. The system utilizes a low-power and wide transmission bandwidth optical link, making it suitable for various tactile sensors. Experimental tests on a system prototype show the functionality and real-time operation capabilities of the proposed system, with a communication energy consumption of 50 pJ/bit.
Article
Engineering, Manufacturing
Markellos Ntagios, Habib Nassar, Ravinder Dahiya
Summary: The new 3D printer developed in this study combines Fused Filament Fabrication and Direct Ink Write technologies, allowing the printing of multiple materials simultaneously. It expands the range of printable materials and enables the mixing and printing of multi-part materials, including complex ones like two-part rubbers. Experimental results demonstrate the printer's good control even at high printing speeds (up to 20 mm/s).
ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
Joao Neto, Abhishek Singh Dahiya, Ayoub Zumeit, Adamos Christou, Sihang Ma, Ravinder Dahiya
Summary: Printing technologies are revolutionizing electronics by offering resource-efficient, low-cost, and innovative form factors. However, printing high-performance and stable transistors for large-scale integration remains challenging due to difficulties in printing high-mobility semiconducting materials and the lack of high-resolution printing techniques.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Gaurav Khandelwal, Guanbo Min, Xenofon Karagiorgis, Ravinder Dahiya
Summary: In this study, a fully biodegradable TENG composed of aligned PLLA fibers and chitosan as the active layers was reported. The aPLLA fiber based TENG showed superior performance due to better helix chain conformation. The TENG demonstrated excellent mechanical stability and produced a high output power density. This approach provides an attractive green energy harvesting solution for powering portable devices without concerns of electronic waste management.
Article
Engineering, Electrical & Electronic
Ajay Beniwal, Dina Anna John, Ravinder Dahiya
Summary: This letter presents a flexible and disposable humidity sensor based on PEDOT:PSS. The sensing layer is developed by drop casting PEDOT:PSS on screen printed graphene-carbon-ink-based IDEs on paper substrate. The sensor exhibits substantial response (118.5% at 90%RH) with response/recovery time as 70/30 s in a wide humidity range (25%RH-90%RH) at room temperature. The sensor shows promising applications in skin moisture monitoring, environmental humidity monitoring, and noncontact switching in healthcare and agriculture.
IEEE SENSORS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Christian Gianoglio, Edoardo Ragusa, Paolo Gastaldo, Maurizio Valle
Summary: This letter introduces a neural architecture search method to optimize tactile elaboration systems, considering the computational cost of the entire pipeline including data preprocessing and a convolutional neural network (CNN) model for information extraction. The strategy is applied to train standard 1-D CNNs and binary CNNs on a three-class touch modality classification dataset. Experimental results show that systems based on standard CNNs outperform state-of-the-art techniques in terms of accuracy and computational cost, while those based on binary CNNs further reduce computational cost with a slight accuracy drop.
IEEE SENSORS LETTERS
(2023)
Article
Optics
Bhavani Prasad Yalagala, Abhishek Singh Dahiya, Ravinder Dahiya
Summary: Disposable devices for reliable measurements have gained interest recently. This study presents degradable UV photodetectors made of ZnO nanowires on flexible chitosan substrate. The device exhibits excellent photo response, mechanical flexibility, and thermal stability. Biodegradability studies show fast degradation in deionized water compared to PBS solution. These findings suggest the potential for environmentally-friendly and cost-effective fabrication of wearable and disposable sensing systems.
OPTO-ELECTRONIC ADVANCES
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
Moustafa Saleh, Yahya Abbass, Maurizio Valle
Summary: This paper proposes a lightweight implementation of preprocessing method for a multichannel tactile sensing system. The experimental results on hardware analysis demonstrate the feasibility of this method. It enhances the extraction of high-bandwidth information and is suitable for time and hardware-constrained applications.
ADVANCES IN SYSTEM-INTEGRATED INTELLIGENCE, SYSINT 2022
(2023)
Proceedings Paper
Engineering, Manufacturing
Ajay Beniwal, Priyanka Ganguly, Deepan Kumar Neethipathi, Ravinder Dahiya
Summary: In this work, a screen-printed humidity sensor on a flexible PVC substrate was presented. A comparative analysis was conducted between a printed graphene-carbon electrode with and without PEDOT:PSS modification. The modified sensor showed enhanced performance, particularly in the low to moderate humidity range, and its applicability in neonatal care was demonstrated.
2022 IEEE INTERNATIONAL CONFERENCE ON FLEXIBLE AND PRINTABLE SENSORS AND SYSTEMS (IEEE FLEPS 2022)
(2022)
Proceedings Paper
Engineering, Manufacturing
Moupali Chakraborty, Rudra Mukherjee, Ravinder Dahiya
Summary: This research demonstrates the impact of conductive materials on printed antennas and their reliable operation, as well as the comparison with conventional copper etched rigid and flexible tags regarding electromagnetic performance. The mechanical stability of printed tags under varying strain conditions is also investigated.
2022 IEEE INTERNATIONAL CONFERENCE ON FLEXIBLE AND PRINTABLE SENSORS AND SYSTEMS (IEEE FLEPS 2022)
(2022)
Proceedings Paper
Engineering, Manufacturing
Habib Nassar, Ravinder Dahiya
Summary: This paper presents the use of an optimized conductive thermoplastic filament as a strain sensing material in embedded structures, enhancing sensing performance. The sensor showed a significant change in resistance at bending angles, outperforming other non-functionalized MWCNT-based strain sensors. By optimizing the filler particle morphology, concentration, and sensor design, a high performance and durable strain sensor was developed. 3D printed embedded strain sensors find application in various fields.
2022 IEEE INTERNATIONAL CONFERENCE ON FLEXIBLE AND PRINTABLE SENSORS AND SYSTEMS (IEEE FLEPS 2022)
(2022)
