Article
Chemistry, Physical
Jizhong Zhao, Yuan Yao, Wentao Lei, Li Zhao, Andeng Liu, Meidan Ye, Jianyang Wu, Shihui Guo, Wenxi Guo
Summary: Researchers have developed an anti-interference self-powered acoustic fabric (ASAF) that can be used as a precise and wearable sound receiver in complex acoustic environments. The ASAF, which uses polyvinylidene fluoride (PVDF) as a vibration-sensitive layer, can record human speech at a wide range of frequencies (0-5000 Hz). The system can recognize 25 words related to extreme weather conditions with over 95.8% accuracy. The ASAF is expected to benefit outdoor rescuers, journalists, students, and other professionals working in complex acoustic environments.
Article
Chemistry, Physical
Weon-Guk Kim, Daewon Kim, Hye Moon Lee, Yang-Kyu Choi
Summary: In this study, a wearable fabric-based energy harvester is demonstrated, which hybridizes a triboelectric generator and a thermoelectric generator. The fabric-based energy harvester effectively scavenges electrical energy from body motion and body heat, and charges a storage capacitor with the harvested energy, which can be used to partially charge a smartphone.
Article
Chemistry, Physical
Ashaduzzaman Khan, Tanvir Alam, Mamunur Rashid, Shahedur Rahman Mir, Gaffar Hossain
Summary: This work presents a cost-effective and industrially scalable method for producing fiber-based TENG using PDMS-coated silver conductor fiber. The feasibility of TENG fiber production is demonstrated, and the fibers are integrated into wearable garments for self-powered sensors and harvesters. The PDMS-coated silver TENG shows high durability and stability, and can be integrated into various healthcare objects and wearable sports items.
Article
Chemistry, Multidisciplinary
Dongdong Li, Sheng Yang, Xin Chen, Wen-Yong Lai, Wei Huang
Summary: A novel strategy using 3D fabrics to construct high cross-section micro-supercapacitors is introduced, achieving high areal capacitance and excellent bending stability. The resulting fabric-based MSCs demonstrate ultra-high areal capacitance of 135.4 mF cm(-2) and 94% capacitance retention even after 3000 cycles, showing promise for next-generation wearable electronics.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Bhavya Padha, Sonali Verma, Sandeep Arya
Summary: This study develops a self-charging supercapacitor using lead-free perovskites and polyvinyl alcohol-potassium hydroxide film, which exhibits high flexibility, stability, and self-charging potential, making it suitable for wearable electronics.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Yue Hou, Yang Yang, Ziyu Wang, Zhaoyu Li, Xingzhong Zhang, Brandon Bethers, Rui Xiong, Haizhong Guo, Hongyu Yu
Summary: Ultraflexible fabric-based thermoelectric generators (uf-TEGs) with conductive cloth electrodes and elastic fabric substrate have been developed, demonstrating excellent integrity and flexibility for high functional thermoelectric performance under large strain or irregularly shaped heat sources.
Article
Instruments & Instrumentation
Mingyi Liu, Cherice Hill, Robin Queen, Lei Zuo
Summary: This paper presents a lightweight device that generates electricity by harvesting energy from the negative muscle work of the human ankle, without interfering with natural motion. The device engages and disengages using a simple but effective passive mechanism design and can produce electric power during the terminal stance phase.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Jia Yi, Kai Dong, Shen Shen, Yang Jiang, Xiao Peng, Cuiying Ye, Zhong Lin Wang
Summary: Combining flexible and stretchable textiles with self-powered sensors introduces a new perspective for wearable functional electronics and cyber security in the era of Internet of Things. A fully fabric-based triboelectric nanogenerator and a self-powered wearable keyboard are developed for biomechanical energy harvesting and real-time biometric authentication, showing promising applications in wearable electronics, self-powered sensors, cyber security, and artificial intelligences.
NANO-MICRO LETTERS
(2021)
Article
Chemistry, Analytical
Rawan Omar, Miaomiao Yuan, Jing Wang, Majd Sublaban, Walaa Saliba, Youbin Zheng, Hossam Haick
Summary: Online monitoring of prognostic biomarkers is crucial but sustaining power remains a challenge. This article presents a wearable microneedle-based biosensor that can detect multiple biomarkers and a hybrid powering system for extended use.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Physical
Kavya Sreeja Sadanandan, Zakaria Saadi, Conor Murphy, Ineta Grikalaite, Monica F. Craciun, Ana I. S. Neves
Summary: Researchers developed a truly wearable fabric-based TENG device using graphene nanoplatelets as the electrode and PDMS polymer as the dielectric layer. It is capable of producing a voltage of 397 V and a current of 6.8 μA when in contact with nylon fabric. The study also investigated the effect of various parameters on the TENG's operation and demonstrated its potential for integration into self-powered smart textiles.
Article
Energy & Fuels
Omar Mendez-Lira, Enrique Mario Spinelli, Rafael Gonzalez-Landaeta
Summary: The study proposes a system for managing energy harvested from finger movements using a glove-type garment and multiple sensors, capable of storing energy and powering devices, useful for manipulating electronic devices, and able to collect biomechanical energy in various activities.
Article
Energy & Fuels
Se Yeong Jeong, Liang Liang Xu, Chul Hee Ryu, Anuruddh Kumar, Seong Do Hong, Deok Hwan Jeon, Jae Yong Cho, Jung Hwan Ahn, Yun Hwan Joo, In Wha Jeong, Won Seop Hwang, Tae Hyun Sung
Summary: This study presents a self-powered wireless communication system that utilizes a piezoelectric energy harvester in a shoe. By placing the energy harvester under the shoe sole and utilizing periodic compression, wireless communication within the shoe is powered. This system is significant for monitoring the status of workers during night shifts or when working alone, as well as detecting emergencies.
Article
Nanoscience & Nanotechnology
He Tian, Wen Gu, Xiao-Shi Li, Tian-Ling Ren
Summary: A stretchable thermal-acoustic device based on graphene ink was fabricated and showed stable resistance and sound pressure level (SPL) changes within 10% after multiple cycles of bending, folding, prodding, and washing. The SPL also exhibited an increase with strain in a specific range, similar to the negative differential resistance (NDR) effect. This study sheds light on the potential use of stretchable thermal-acoustic devices in e-skin and wearable electronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Energy & Fuels
Yiqing Yang, Peihao Chen, Qiang Liu
Summary: A coaxial mechanical motion rectifier with a planetary gear train and four one-way clutches is designed to increase transmission ratio, along with the incorporation of a variable inertia flywheel to extend the overrunning phase. Experimental results show that the design is beneficial in improving the output power and efficiency of the wave energy harvester.
Article
Chemistry, Multidisciplinary
Md Salauddin, S. M. Sohel Rana, Muhammad Toyabur Rahman, Md Sharifuzzaman, Pukar Maharjan, Trilochan Bhatta, Hyunok Cho, Sang Hyun Lee, Chani Park, Kumar Shrestha, Sudeep Sharma, Jae Yeong Park
Summary: A novel scalable surface modification method using fabric-assisted micropatterning technique on highly negative MXene/silicone nanocomposite surface for self-powered sensors and wearable electronics is introduced. The microstructured surface improves the output performance of DSC-TENG by factors of 9.8 and 20 for voltage and peak current density, respectively, compared to flat silicone.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Changik Im, Jiyeon Kim, Nam-Kwang Cho, Jintaek Park, Eun Goo Lee, Sung-Eun Lee, Hyun-Jae Na, Yong Jun Gong, Youn Sang Kim
Summary: This study introduces a new working mechanism in dual-stacked OS and develops a TFT with improved performance. The concept of band offset-induced areas is proposed to explain high current flow, offering new design rules for high-performance OS-based TFTs.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Haeyeon Lee, Minho Jin, Hyun-Jae Na, Changik Im, Jae Hak Lee, Jiyeon Kim, Yong Jun Gong, Chan Lee, Eungkyu Lee, Youn Sang Kim
Summary: This study proposes a water-in-bisalt/polymer electrolyte-gated synaptic transistor treated with ultraviolet ozone, which exhibits multiple synaptic functions and improved long-term plasticity. Surface engineering plays a crucial role in enhancing ion transport efficiency, and the trap sites generated by UV light and active oxygen during UVO treatment contribute to capturing lithium cations for better device performance.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Huding Jin, Junwoo Park, Sun Geun Yoon, Won Hyung Lee, Yong Hyun Cho, Junghyup Han, Zhenxing Yin, Youn Sang Kim
Summary: Water-infiltration-induced power generation can generate electrical energy from ambient water, and the carrier concentration in the semiconductor affects electricity generation. However, research on this aspect is still lacking.
Article
Chemistry, Multidisciplinary
Junghyup Han, Sun Geun Yoon, Won Hyung Lee, Huding Jin, Yong Hyun Cho, Youn Sang Kim
Summary: The paper investigates the ion-charge carrier interaction at the electrolyte-semiconductor interface, elucidating an electricity generating mechanism from interfacial ionic diffusion controlled by self-assembled molecules. The effects can be modulated by chemical functionalization of the interface molecular layer and transition metal ion complexation.
Article
Chemistry, Multidisciplinary
Minho Jin, Haeyeon Lee, Changik Im, Hyun-Jae Na, Jae Hak Lee, Won Hyung Lee, Junghyup Han, Eungkyu Lee, Junwoo Park, Youn Sang Kim
Summary: This study introduces a fluoroalkylsilane self-assembled monolayer to achieve stable synaptic plasticity in Li+ electrolyte-gated transistors (EGTs) with high fidelity, linearity, and symmetry. Experimental and simulation results using EGTs treated with fluoroalkylsilane with 5 fluoroalkyl chains demonstrate its suitability as artificial synapses for neuromorphic computing.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Applied
Changik Im, Jiyeon Kim, Jae Hak Lee, Minho Jin, Haeyeon Lee, Jiho Lee, Jong Chan Shin, Chan Lee, Youn Sang Kim, Eungkyu Lee
Summary: Synaptic thin-film transistors (TFTs) have advantages in signal processing and information storage, but their analysis is limited by the RC circuit model. This study proposes a single-pulse-driven synaptic EPSC model that includes capacitive effects and synaptic window information, enabling the simulation of EPSC in different TFT operating conditions.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ji Soo Kim, Soon-Hyung Kwon, Youn Sang Kim
Summary: Several studies have shown that thermal annealing induces intermixing at the interfaces of solution-processed OLEDs and improves device performance. In this study, impedance spectroscopy (IS) analysis was used to examine the changes in charge carrier dynamics in a solution-processed bilayer OLED after thermal annealing. The results showed that the improved charge transport of the electron transporting layer (ETL) was responsible for the performance enhancement, while significant intermixing at temperatures above the ETL's T-g led to decreased current efficiency.
Article
Chemistry, Physical
Huding Jin, Won Hyung Lee, Yong Hyun Cho, Junghyup Han, Changik Im, Seungyeon Yu, Lianghui Li, Jaewon Lee, Zhenxing Yin, Youn Sang Kim
Summary: This study demonstrates a self-powered illuminating glucose sensor that utilizes electricity generated from water infiltration phenomenon. The sensor has high sensitivity and selectivity, and can detect a wide range of glucose concentrations. The electricity generation is attributed to the adsorption/desorption of ions at the solid-liquid interface, and it can successfully distinguish harmful glucose concentrations to the human body.
Article
Physics, Applied
Minho Jin, Haeyeon Lee, Jae Hak Lee, Daeyoung Han, Changik Im, Jiyeon Kim, Moongu Jeon, Eungkyu Lee, Youn Sang Kim
Summary: In this research, Li+ electrolyte-gated transistors (EGTs) integrated with PVDF-TrFE ferroelectric polymer as a channel-electrolyte interlayer were presented. The transport of Li+ ions at the channel-electrolyte interface was accelerated, and Li+ ions effectively penetrated the channel due to the polarized domains of PVDF-TrFE. The EGTs demonstrated synaptic characteristics and showed high linearity and stability over 100 cycles, making them suitable as artificial synapses with an inference accuracy of 89.13% for the CIFAR-10 dataset.
APPLIED PHYSICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Jae Hak Lee, Jiyeon Kim, Minho Jin, Hyun-Jae Na, Haeyeon Lee, Changik Im, Youn Sang Kim
Summary: Cu2O TFTs with improved field-effect mobility and low off-current were achieved by reducing CuO impurities and dissociative Cu defects through a combination of deposition and annealing conditions. Nitrogen and oxygen play crucial roles in promoting Cu2O phase formation and preventing CuO phase formation.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Review
Chemistry, Physical
Won Hyung Lee, Junwoo Park, Sun Geun Yoon, Huding Jin, Junghyup Han, Youn Sang Kim
Summary: Ionovoltaics is a breakthrough concept that utilizes ion dynamics and water motion to generate electrical energy. By studying the nanoscopic ionic behavior at the solid-liquid interface and the flow of electrons in a semiconductor electrode, ionovoltaic research aims to provide a rational mechanism for energy conversion by water motion and discuss the potential for transforming related fields through the development of enabling technologies. The development of high-efficiency ionovoltaic devices powered by small water droplets can contribute to green energy systems and address environmental pollution and energy shortages.
Article
Chemistry, Multidisciplinary
Jiho Lee, Jae Hak Lee, Chan Lee, Haeyeon Lee, Minho Jin, Jiyeon Kim, Jong Chan Shin, Eungkyu Lee, Youn Sang Kim
Summary: Machine learning, specifically Bayesian optimization, is applied to the design of dual-layer oxide semiconductor thin film transistors (OS TFTs), achieving remarkable electrical performance while reducing experimental trials. The optimized dual-layer OS TFTs show enhanced field effect mobility and stability under bias stress.
Article
Chemistry, Physical
Yong Hyun Cho, Huding Jin, Won Hyung Lee, Junghyup Han, Minho Jin, Seungyeon Yu, Lianghui Li, Sun Geun Yoon, Youn Sang Kim
Summary: The solid-liquid interfacial effect is crucial in the interaction between a solid surface and dynamic water motion, but the exact source of energy conversion and the fluidic processes with water and charge carrier movement are still not well understood. This study demonstrates the mechanism of water motion-induced energy generation at 2D nanomaterials through water contact-driven carrier density modulation and fermi energy level shift. Dynamic carrier motions are observed and supported by a metal electrode configuration, showing that the modulated electronic energy levels between wet and dry regions play a key role in electricity generation.
Article
Chemistry, Multidisciplinary
Yong Jun Gong, Seonmi Pyo, Hyunjin Kim, Jinil Cho, Heejun Yun, Heebae Kim, Seokgyu Ryu, Jeeyoung Yoo, Youn Sang Kim
Summary: The study successfully addressed the challenge of unstable solid electrolyte interphase (SEI) on a Li metal anode by applying graphene-coated aramid to the separator, inducing LiF formation through fluorinated metathesis on a conjugated carbon network. Additional experiments demonstrated the effectiveness of this method with other CCN materials, showing that negative functionalities and lattice structure of the materials played a role in the fluorination process.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Hyun-Jae Na, Sung-Eun Lee, Eun Goo Lee, Jae Hak Lee, Yong Jun Gong, Heebae Kim, Nam-Kwang Cho, Youn Sang Kim
Summary: Despite the significant potential of halide perovskites in advanced optoelectronics, their commercialization is hindered by toxicity and poor stability. By utilizing UV-cured PEGDMA, Cs2SnI6 perovskites can achieve nontoxicity, long-term stability, and broad-band photoelectric properties, demonstrating promising applications in broad-band optical devices.
ACS APPLIED NANO MATERIALS
(2021)
