Article
Engineering, Chemical
Hanadi Al-Mohsin, Shawkat Ali, Amine Bermak
Summary: This paper examines the simulation, design, and fabrication of a nano-particle silver microheater. Through experiments and simulations, it is found that the fabricated microheater has stable output performance and temperature range under certain conditions.
Article
Chemistry, Multidisciplinary
Matthew J. Griffith, Nathan A. Cooling, Daniel C. Elkington, Michael Wasson, Xiaojing Zhou, Warwick J. Belcher, Paul C. Dastoor
Summary: This study presents a highly sensitive pressure detector developed through inkjet printing of electroactive organic semiconducting materials, capable of rapidly converting shock wave inputs into amplified electronic signals. By optimizing the transistor response through variation of materials, solvents, and printing speeds, the printed device can quickly switch from non-conductive to conductive states at low voltages. The printed sensor operates without the need for gate voltage bias, offering a simple and low-cost solution for detecting stimuli in highly energetic systems.
Article
Materials Science, Ceramics
Frances Danielle M. Fernandez, Murali Bissannagari, Jihoon Kim
Summary: This paper introduces a novel technique to enhance the sensing performance of humidity sensors by modifying the microstructure of BaTiO3 humidity sensing layers through optimizing the mixing ratios of bimodal inks deposited by inkjet printing. The optimized sensor achieved high sensitivity, good repeatability, linearity, response and recovery time, low hysteresis, and stability over time, making it suitable for various applications.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Jiawei Sun, Yunfei Sun, Haiyang Jia, Hengchang Bi, Lixiang Chen, Miaoling Que, Yuwei Xiong, Longxiang Han, Litao Sun
Summary: Inkjet printing of graphene-based materials is a promising deposition method, but faces challenges with the coffee ring effect. This paper demonstrates a novel pre-deposition assisted strategy to achieve uniform deposition of graphene nanosheets, resulting in a flatter printed pattern. The method opens up opportunities for low-cost inkjet printing of graphene-based electronic devices with desirable performance.
Article
Chemistry, Analytical
Bruno Ando, Salvatore Baglio, Vincenzo Marletta, Ruben Crispino
Summary: This paper introduces a fully inkjet-printed mass sensor which utilizes low-cost InkJet Printing technology for sensing and actuation strategies. The sensor's design, implementation, and characteristics are described, showcasing its wide range of potential applications requiring precise mass measurements.
Article
Chemistry, Physical
Ju-Hun Ahn, Hee-Ju Hong, Chang-Yull Lee
Summary: This study focuses on overcoming the limitation of current temperature sensors in measuring curved surfaces by developing temperature-sensing ink using electrohydrodynamic (EHD) inkjet printing technology. Through investigation of the ink's resistance characteristics and observation of printed results, it was confirmed that the ink is applicable to EHD inkjet printing technology.
Article
Chemistry, Analytical
Zhou Zheng, Naeun Kim, William S. Wong, John T. W. Yeow
Summary: The study demonstrates the advantages of functionalizing CMUT with inkjet-printed GO film in terms of high sensitivity and low hysteresis. Using GO films of different thicknesses can achieve high humidity sensitivity, fast response time, and low hysteresis. The inkjet printing technique shows great potential for functionalizing CMUT.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Multidisciplinary
Guosheng Zhang, Sheng Zhou, Tongtong Jiang, Zhihua Pu, Jinsong Li, Jinhui Shi, Zhigang Cao, Benli Yu
Summary: A novel quantum dots optical fiber micro-probe temperature sensor is proposed in this paper. The sensor is fabricated using selective etching and fiber end-face inkjet printing, enabling high-efficiency fluorescence excitation and collection. The sensor exhibits high sensitivity, good repeatability, and has potential applications in medical diagnosis, environmental measurement, and industrial production.
Review
Electrochemistry
Hanim Hussin, Norhayati Soin, Sharifah Fatmadiana Wan Muhamad Hatta, Fazliyatul Azwa Md Rezali, Yasmin Abdul Wahab
Summary: This review summarizes the latest advances in the development of various flexible sensor structure platforms fabricated by the inkjet printing technique. It discusses the characteristics and advantages of different types of biosensors and tactile sensors with a focus on flexibility and wearability. The review also outlines the design and processing strategies of inkjet printing, highlighting the future challenges and research opportunities in the field.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Analytical
Wei Yin Lim, Choon-Hian Goh, Keenan Zhihong Yap, Narayanan Ramakrishnan
Summary: Irregularities in breathing patterns can be predicted with the help of breath monitor sensors that detect variations in humidity during inhalation and exhalation. Graphene-based RH sensors show excellent sensitivity, stability, and repeatability. By embedding the sensor into a face mask and interfacing it with a microcontroller, different breathing situations can be measured, making it a promising wearable and disposable healthcare technology.
Article
Materials Science, Multidisciplinary
Ting-Kuo Kang
Summary: Flexible strain sensors were fabricated using inkjet printing technology, showing high transparency and excellent strain sensing performance. By adjusting the material structure and proposing a new improvement method, the sensitivity and stability of the strain sensors were significantly enhanced.
Article
Chemistry, Multidisciplinary
Farman Ullah, Khaled Ibrahim, Kissan Mistry, Abdus Samad, Ahmed Shahin, Joseph Sanderson, Kevin Musselman
Summary: We investigated the interaction between various analytes and a laser-exfoliated WS2 sensing material in a chemiresistive sensor. The response of the sensor was greatly enhanced by modifying the WS2 surface with WS2-ZnO heterojunctions. Water and ethanol produced a much higher response compared to acetone and toluene, and the charge asymmetry points in the analyte molecules played a key role in determining the sensor response. Our study provides valuable insights for advancing semiconductor gas sensors based on two-dimensional materials.
Article
Chemistry, Analytical
Qin Zhou, Hongjie Song, Tong Sun, Lichun Zhang, Yi Lv
Summary: In this study, WS2 nanosheets prepared through simple method exhibit excellent H2S sensing performance with low working temperature, fast response and recovery time, and improved catalytic properties. A possible sensing mechanism involving the formation of WS2/WO3 hybrids is proposed, contributing to the repeatability of the sensor and offering a new perspective on the mechanism of H2S gas sensing.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Environmental
Jianpeng Wu, Haoming Pang, Li Ding, Yu Wang, Xiaokang He, Quan Shu, Shouhu Xuan, Xinglong Gong
Summary: The ultrathin aramid-based flexible sensor, produced through inkjet printing and buckling strategy, demonstrates excellent electrical response to external pressure, sensitive subtle-pressure perception, remarkable mechanical durability, and rapid response and recovery speed. It can be attached to skin/machine surfaces for continuous monitoring of various physical signals and has the potential for broad applications in contact and noncontact perception platforms for portable electronic devices.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Computer Science, Software Engineering
Koya Narumi, Kazuki Koyama, Kai Suto, Yuta Noma, Hiroki Sato, Tomohiro Tachi, Masaaki Sugimoto, Takeo Igarashi, Yoshihiro Kawahara
Summary: We propose Inkjet 4D Print, a method that uses an inkjet UV printer to print 2D patterns on a heat-shrinkable base sheet to create self-folding 3D origami tessellations. Compared to previous folding-based 4D printing approaches using FDM 3D printers, our method offers higher resolution, faster printing speed, and optional full-color decoration.
ACM TRANSACTIONS ON GRAPHICS
(2023)
Article
Engineering, Electrical & Electronic
Sung-Tae Lee, Jong-Ho Lee
Summary: This work proposes using separate synaptic string arrays for error backpropagation in NAND flash memory-based synaptic architecture. Forward and backward propagations are processed in separate synaptic devices in forward and backward synaptic arrays. The optimal conductance response is investigated, and reliability characteristics are verified. Hardware-based neural networks with random synaptic weight achieve a high inference accuracy comparable to that of transposed weight. The proposed on-chip learning scheme maintains high inference accuracy even with increasing device variation.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Multidisciplinary
Jung Hun Lee, Jaegeun Lyu, Minsong Kim, Hyungju Ahn, Soohwan Lim, Ho Won Jang, Hyun-Jong Chung, June Hyuk Lee, Jaseung Koo, Wi Hyoung Lee
Summary: Interfacial structures of TIPS-pentacene/polymer blends were investigated using neutron and X-ray reflectivity. The TIPS-pentacene/d-PMMA blends exhibited a vertically phase-separated structure with a sharp interface, while the TIPS-pentacene/d-PS blend showed intermixing near the interface. The formation of surface-segregated hexagonal spherulites of TIPS-pentacene on d-PMMA interface resulted in higher field-effect mobility compared to dendritic crystals from d-PS blends.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Seungwan Woo, Eungbeom Yeon, Rafael Jumar Chu, Jihoon Kyhm, Hoki Son, Ho Won Jang, Daehwan Jung, Won Jun Choi
Summary: Epitaxial growth of bulk InAs1-xSbx layer on GaAs substrate is a promising method for cost-effective long-wavelength infrared sensors. This study focuses on the analysis of metamorphic InAsSb layers grown on an InAs/GaAs virtual substrate with optimized growth conditions and group-V flux control. The research reveals that increasing Sb composition leads to significant surface roughening, but lowering the growth temperature mitigates this while allowing strain relaxation. Furthermore, a high Sb composition also results in a dramatic increase in threading dislocation density. The narrow energy bandgap achieved in the InAs0.42Sb0.58 layer demonstrates its potential for long-wavelength infrared optoelectronics applications.
APPLIED SURFACE SCIENCE
(2023)
Review
Chemistry, Physical
Yujin Kim, Sang Eon Jun, Goeun Lee, Seunghoon Nam, Ho Won Jang, Sun Hwa Park, Ki Chang Kwon
Summary: Green hydrogen, created by water splitting with renewable electricity, is regarded as a next-generation sustainable energy source. Electrodeposition, with its advantages of being environmentally friendly and economically advantageous, is widely used to prepare electrocatalysts for highly efficient water-splitting systems. However, there are still challenges in depositing uniform and large numbers of catalytic active sites. This review article focuses on recent advancements in electrodeposition for water splitting and discusses strategies to address current issues, as well as highly catalytic electrodeposited catalyst systems.
Review
Chemistry, Physical
Goeun Lee, Sang Eon Jun, Yujin Kim, In-Hyeok Park, Ho Won Jang, Sun Hwa Park, Ki Chang Kwon
Summary: Developing cost-effective, highly catalytic active, and stable electrocatalysts in alkaline electrolytes is crucial for efficient anion-exchange membrane water electrolysis (AEMWE). Metal oxides/hydroxides have emerged as promising electrocatalysts for water splitting due to their abundance and tunable electronic properties. However, achieving efficient catalytic performance with single metal oxide/hydroxide-based electrocatalysts is challenging. This review focuses on advanced strategies such as nanostructure engineering, heterointerface engineering, single-atom catalysts, and chemical modification to synthesize multicomponent metal oxide/hydroxide-based materials. The challenges and future prospects of these electrocatalysts are discussed.
Article
Materials Science, Multidisciplinary
Chung Won Lee, Sang Eon Jun, Seung Ju Kim, Tae Hyung Lee, Sol A. Lee, Jin Wook Yang, Jin Hyuk Cho, Shinyoung Choi, Cheol-joo Kim, Soo Young Kim, Ho Won Jang
Summary: Continuous monitoring of taste-inducing ions and molecules in liquids is crucial for the development of electronic tongues (E-tongues). This study focuses on the highly selective and sensitive real-time detection of Na+ due to its importance in determining the saltiness of food. The researchers designed a graphene-based channel decorated with Calix[4]arene and Nafion, which act as a receptor and a molecular sieve respectively, to enhance selectivity and sensitivity and prolong the device's lifespan. By combining the device with a microfluidic channel, dynamic on-off functions were achieved. The device exhibits highly selective and sensitive Na+ detection properties compared to other molecules/ionic species and has a lifespan of at least 220 days. It can also accurately distinguish real beverages containing Na+, as demonstrated by principal component analysis. These findings suggest that the device has the potential to become a platform for E-tongues in the future.
Article
Materials Science, Multidisciplinary
Soo Young Jung, Hyung-Jin Choi, Jun Young Lee, Min-Seok Kim, Ruiguang Ning, Dong-Hun Han, Seong Keun Kim, Sung Ok Won, June Hyuk Lee, Ji-Soo Jang, Ho Won Jang, Seung-Hyub Baek
Summary: Epitaxial buffer layers such as ceria (CeO2)/yttria-stabilized zirconia (YSZ) allow direct integration of oxide single crystal thin films on silicon (Si). This study investigated the evolution of microcracks in sputter-grown epitaxial CeO2 layers by varying the sputtering power and thickness of CeO2 thin films on different substrates. The results showed that increasing the sputtering power resulted in more compressive strain in the CeO2 thin films, which suppressed the evolution of microcracks.
ELECTRONIC MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Gyuweon Jung, Jaehyeon Kim, Seongbin Hong, Hunhee Shin, Yujeong Jeong, Wonjun Shin, Dongseok Kwon, Woo Young Choi, Jong-Ho Lee
Summary: An energy- and area-efficient artificial olfactory system based on near-sensor computing is proposed. It efficiently integrates sensing units with a nonvolatile memory array, allowing direct signal computation in memory. The system can detect food spoilage using thin zinc oxide films as gas-sensing materials and continuously monitor freshness scores and food conditions throughout the spoilage process.
Article
Chemistry, Physical
Byungsoo Kim, Seungju Kim, Tae Hyung Lee, Duyoung Yang, Dongyup Lee, Woonbae Sohn, Euijoon Yoon, Yongjo Park, Ho Won Jang
Summary: This study achieved highly enhanced photoelectrical performance of UVC PDs by implementing single-domain epitaxy on a hexagonal sapphire substrate. The 2D beta-Ga2O3 films exhibited a smooth surface and low concentration of point defects, enabling efficient charge separation. Additionally, a tailored anti-reflection coating was adopted to improve charge generation.
Article
Automation & Control Systems
Wonjun Shin, Kyung Kyu Min, Jong-Ho Bae, Jaehyeon Kim, Ryun-Han Koo, Dongseok Kwon, Jae-Joon Kim, Daewoong Kwon, Jong-Ho Lee
Summary: In recent years, the development of neuromorphic computing has faced the limitations of von Neumann architecture. Therefore, there is a growing demand for high-performance synaptic devices that possess high switching speeds, low power consumption, and multilevel conductance. Among various synaptic devices, ferroelectric tunnel junctions (FTJs) have emerged as promising candidates. While previous studies have focused on improving the reliability of FTJs to enhance synaptic behavior, the low-frequency noise (LFN) of FTJs and its impact on the learning accuracy in neuromorphic computing have not been thoroughly investigated. This study explores the LFN characteristics of FTJs fabricated on n- and p-type Si and evaluates the impact of 1/f noise on the learning accuracy of convolutional neural networks (CNNs). The results demonstrate that FTJs on p-type Si exhibit significantly lower 1/f noise than those on n-type Si. Consequently, the FTJs on p-type Si achieve a significantly higher learning accuracy (86.26%) compared to those on n-type Si (78.70%) due to their low-noise properties. This study provides valuable insights into the LFN characteristics of FTJs and offers a potential solution to enhance the performance of synaptic devices by drastically reducing 1/f noise.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Chemistry, Analytical
Tae Hoon Eom, Sang Eun Lee, Yeong Jae Kim, Sungkyun Choi, Gi Baek Nam, Jung-El Ryu, Tae Hyung Lee, Jin Wook Yang, Sung Hwan Cho, Seung Ju Kim, Sang Eon Jun, Seonyong Lee, Seungsoo Kim, Hee Jung Park, Ho Won Jang
Summary: Chemoresistive humidity sensors based on ultrathin V2O5•nH2O nanobelts show promising performance in real-time breath monitoring, with rapid response and recovery, as well as excellent selectivity to humidity.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Computer Science, Artificial Intelligence
Dongseok Kwon, Sung Yun Woo, Joon Hwang, Hyeongsu Kim, Jong-Ho Bae, Wonjun Shin, Byung-Gook Park, Jong-Ho Lee
Summary: Neuromorphic hardware using nonvolatile analog synaptic devices can reduce energy and time consumption for large-scale vector-matrix multiplication operations. However, existing training methods have reduced accuracy and high training costs. This study proposes a novel hybrid training method that efficiently trains the hardware using nonvolatile analog memory cells, demonstrating high performance in the fabricated hardware.
IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS
(2023)
Article
Nanoscience & Nanotechnology
Eungbeom Yeon, Seungwan Woo, Rafael Jumar Chu, In-Hwan Lee, Ho Won Jang, Daehwan Jung, Won Jun Choi
Summary: Monolithic integration of GaSb-based optoelectronic devices on Si is a promising approach for achieving a low-cost, compact, and scalable infrared photonics platform. Using appropriate defect filter layers can reduce dislocation densities and improve performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Physical
Sang Eon Jun, Jae Kwan Lee, Ho Won Jang
Summary: This review summarizes the superiorities and utilizations of 2D materials for photoelectrochemical water splitting including transition metal dichalcogenides, graphene, graphdiyne, black phosphorus, layered double hydroxides, g-C3N4, and MXenes.
Review
Chemistry, Physical
Soo Min Lee, Woo Seok Cheon, Mi Gyoung Lee, Ho Won Jang
Summary: This article discusses the principles and recent progress of EC CO2RR, with a focus on the influence of coordination environments of single-atom catalysts on the catalytic ability and active site stability of CO2RR.
Article
Engineering, Electrical & Electronic
Franck Sabatier, Cedric Durand, Dominique Drouin, Michel Pioro-Ladriere, Fabien Ndagijimana, Philippe Galy
Summary: This study investigates the possibility of improving the quality factor and (or) inductance of an inductor integrated into CMOS technology by adding magnetic materials around it. The performance improvement is evaluated through 3D numerical simulations on an SOI substrate made in a 28 nm UTBB FDSOI technology. The choice of materials and their design topologies are the main parameters studied, leading to a solution selection based on the final application. The results show significant improvements in inductance and quality factor by using different design topologies and materials.
SOLID-STATE ELECTRONICS
(2024)
Article
Engineering, Electrical & Electronic
Tobias Reiter, Luiz Felipe Aguinsky, Francio Rodrigues, Josef Weinbub, Andreas Hoessinger, Lado Filipovic
Summary: Atomic layer processing (ALP) is a modern fabrication technique that allows precise control of film thickness, composition, and conformality at a nanometer scale. This article presents a model for surface coverage during ALD in the presence of desorption, leading to incomplete conformality. The model combines diffusion and kinetics methods and has been incorporated into topography simulators for accurate representation of reactor conditions.
SOLID-STATE ELECTRONICS
(2024)
Article
Engineering, Electrical & Electronic
Jingxuan Sun, Yi Han, Yannik Junk, Omar Concepcion, Jin-Hee Bae, Detlev Gruetzmacher, Dan Buca, Qing-Tai Zhao
Summary: This study systematically investigates the formation of NiGeSn and its contact resistivity with GeSn semiconductors. The optimal formation temperature of NiGeSn is found to be 325 degrees C, resulting in a lower contact resistivity on n-GeSn. The study also discusses the elemental diffusion mechanism during the NiGeSn formation. Additionally, GeSn exhibits low contact resistivity at 5 K, making it valuable for optimizing contact technologies for low-power and cryogenic applications.
SOLID-STATE ELECTRONICS
(2024)
Review
Engineering, Electrical & Electronic
Daniela Dragoman, Mircea Dragoman
Summary: Graphene's unique properties have led to the exploration of its analogies in various solid-state structures and systems, enabling the observation of novel phenomena and revealing differences in behavior between different systems. This review highlights the value of using analogies to develop new devices and expand our understanding of physics.
SOLID-STATE ELECTRONICS
(2024)
Article
Engineering, Electrical & Electronic
Sumreti Gupta, Asifa Amin, Reinaldo A. Vega, Abhisek Dixit
Summary: The multifrequency capacitance-voltage characteristics of high-k HfO2-based 10-nm bulk n-channel FinFETs were studied in this work. The dispersion observed in the accumulation region with respect to temperature was found to be influenced by the substrate time constant. Multifrequency conductance measurements and the variation in the surface potential quotient of the accumulation region were used to investigate the effect of direct tunneling current. Modifications to the existing accumulation region compact model equations were proposed.
SOLID-STATE ELECTRONICS
(2024)
Article
Engineering, Electrical & Electronic
N. Vasileiadis, A. Mavropoulis, I. Karafyllidis, G. Ch. Sirakoulis, P. Dimitrakis
Summary: In this work, we fabricate crossbar arrays of silicon nitride resistive memories on silicon-on-insulator substrate and utilize them to realize multi-ratioed logic circuits. The electrical characterization of the memristors shows their ability of multi-state operation with 12 distinct resistance levels. Based on a dedicated modeling and fitting procedure, a reconfigurable logic based on memristor rationed logic scheme is designed and a crossbar integration methodology is proposed. Furthermore, circuitry aspects are simulated with a calibrated model and power optimization prospects are discussed.
SOLID-STATE ELECTRONICS
(2024)
