Article
Chemistry, Multidisciplinary
Jin-Long Wang, Jian-Wei Liu, Si-Zhe Sheng, Zhen He, Jie Gao, Shu-Hong Yu
Summary: By coassembling W18O49 and V2O5 nanowires, a novel multicolor electrochromic device is demonstrated, which shows dynamic color change upon application of different electrochemical biases. The transparency and color of the device can be easily controlled by manipulating the layers and ratios of coassembled nanowires, allowing for the fabrication of different patterns with corresponding masks. This solid electrochromic device assembled from nanowires has significant potentials in smart windows and multicolor electrochromic displays.
Article
Chemistry, Physical
Wenjie Li, Xiang Zhang, Dukang Yan, Lebin Wang, Wenhai Sun, Zitong Li, Jianbo Deng, Jiupeng Zhao, Yao Li
Summary: Electrochromic devices (ECDs) have significant energy-saving effects in green buildings, but degradation induced by ion trapping limits their development. This study demonstrates that the degraded ECDs can be rejuvenated by heat treatment, extending their lifespan and promoting sustainable development.
Article
Chemistry, Physical
Ge Gao, Xinjie Tao, Yuan He, Zongmin Li, Jiale Zhuang, Liwen He, Yuechan Li, Yi Wang, Dongya Sun, An Xie
Summary: This study presents an innovative approach to fabricating electrochromic composite films by doping molybdenum oxide with tungsten atoms. The films demonstrate superior performance in terms of switching time, coloring efficiency, and transmittance, thanks to the unique lamellar structure and W-O-Mo bonding connection. Tungsten doping improves the electrochromic properties of MoO3, indicating promising potential for further applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Electrochemistry
Gamze Atak, Ilknur Bayrak Pehlivan, Jose Montero, Claes G. Granqvist, Gunnar A. Niklasson
Summary: Thin films of W oxide were prepared by reactive DC magnetron sputtering, and the study focused on the influence of critical deposition parameters on electrochromic properties. The results showed that a judicious choice of deposition parameters could yield films with superior cycling durability, providing a pathway towards W oxide films with excellent EC properties.
ELECTROCHIMICA ACTA
(2021)
Article
Materials Science, Multidisciplinary
Dipti R. Sahu, Cheng-Yen Hung, Sheng-Chang Wang, Jow-Lay Huang
Summary: In this study, nanostructured tungsten trioxide (WO3) films with improved cyclic stability were prepared using a low-cost conventional spin coating method. The addition of a polystyrene intermediate layer created a porous structure in the WO3 films, which exhibited stable coloration efficiency, durability, and fast response in the electrochromic cycle. The porous crystalline WO3 films had higher transmittance and coloration efficiency than nonporous films, making them promising for applications in displays, rear view mirrors, and smart windows.
MATERIALS ADVANCES
(2022)
Article
Materials Science, Multidisciplinary
Yoon-Tae Park, Ki-Tae Lee
Summary: Amorphous WO3 thin films with nanoparticulated morphology were fabricated using a combination of electrodeposition and electrophoretic deposition via a precipitation reaction of a peroxotungstic acid (PTA) solution. The aged PTA solution containing precipitated WO3 nanoparticles enhanced the electrochromic characteristics of the thin films, showing faster ion intercalation/de-intercalation kinetics, higher transmittance modulation, coloration efficiency, and cyclic stability compared to films fabricated without the aging process.
Article
Materials Science, Multidisciplinary
Shen Wang, Hongbo Xu, Tingting Hao, Peiyuan Wang, Xiang Zhang, Hongming Zhang, Junying Xue, Jiupeng Zhao, Yao Li
Summary: This study explores the synchronous optical and electrochemical performance correspondence relationship of ESCs constructed with a 3D WO3-x nanowire networks/fluorine-doped tin oxide bifunctional electrode, revealing high areal capacity, excellent optical modulation, and stability. Moreover, it reveals the synergistic reaction mechanism between Al3+ ion intercalation behavior and surface pseudocapacitance reaction, providing a promising pathway for developing multi-functional integrated smart supercapacitors.
NPG ASIA MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
G. V. Ashok Reddy, Sheik Abdul Sattar, K. Naveen Kumar, B. Daruka Prasad, C. Devaraja, H. S. Yogananda
Summary: Cerium oxide nanorods were synthesized on a fluorine-doped tin oxide-coated glass substrate using hydrothermal process, and a nanostructured WO3/CeO2 hybrid film was formed by depositing tungsten oxide on the nanorods. The structural, morphological, optical, and electrochemical properties of the hybrid film were characterized. Improvement in the electrochromic properties of the film was observed with varying growth fluid concentration for growing the cerium oxide nanorods.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Electrochemistry
Chenzheng Hua, Ziqiang Cheng, Yecheng Ma, Haiyan He, Gang Xu, Yong Liu, Shikuan Yang, Gaorong Han
Summary: Researchers explored the electrochromic performance of WO3 brochosomes inspired by natural color-changing living species. The unique ordered structures of WO3 brochosomes enable fast ion transportation, high reflectance modulation, and short response time. The relationship between electrochromic performance and brochosomes structure was established through systematic electrochemical and optical studies.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Wenting Wu, Wei Church Poh, Jian Lv, Shaohua Chen, Dace Gao, Fei Yu, Hui Wang, Huajing Fang, Hong Wang, Pooi See Lee
Summary: A self-powered stretchable electrochromic display is proposed for the first time, using WO3 as the electrochromic electrode integrated with Zn/carbon electrodes and a ZnCl2-based organohydrogel. The device shows reversible coloring/bleaching performance up to 50% strain, with stable power-free reversible electrochemical switching for 400 cycles and 81% optical contrast retention for 200 stretching/recovery cycles. The combined device with a phosphorescent substrate demonstrates light-adaptable stretchable display without power consumption.
ADVANCED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
K. Naveen Kumar, Habibuddin Shaik, V Madhavi, R. Imran Jafri, Jyothi Gupta, G. Nithya, Sheik Abdul Sattar, G. V. Ashok Reddy
Summary: This study investigates the characteristics of tungsten oxide thin films grown using the GLAD technique at different substrate angles. The results show that the films have an amorphous structure, with columnar growth and surface porosity. As the GLAD angle increases, the optical transmittance and bandgap of the films decrease. The study also reveals that the GLAD angle influences the coloration efficiency and diffusion coefficient.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Energy & Fuels
Xiang Zhang, Wenjie Li, Xin Li, Lebin Wang, Wenhai Sun, Hulin Zhang, Jing Wang, Jiupeng Zhao, Yao Li
Summary: This article discusses a bio-inspired chameleon skin electrochromic device (ECD) assembled by inorganic electrochromic materials WO3, which achieves reversible color changes from yellow, light green to dark green. The flexible ECD exhibits a high optical reflectance modulation and fast response speed, even under bending conditions, opening new avenues for intelligent and wearable device design.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Engineering, Electrical & Electronic
Xiaodong Song, Luting Yan, Chunai Dai, Changshi Hao, Hao Guo, Mingming Xie, Yaru Zhang
Summary: Complementary devices with double-hybrid electrodes were prepared to improve device performance by utilizing composite electrochromic films. The study found that the electrochromic properties of WO3/PANI composite films were better than those of WO3 films, mainly due to the modification of surface morphology and conductivity by PANI. Additionally, the electrode reaction process of the complementary device was synchronous and synergetic, resulting in good electrochromic performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Review
Chemistry, Multidisciplinary
Jin You Zheng, Qimeng Sun, Jiameizi Cui, Xiaomei Yu, Songjie Li, Lili Zhang, Suyu Jiang, Wei Ma, Renzhi Ma
Summary: Transition metal oxides have attracted significant interest due to their unique physical and chemical properties. Tungsten trioxide (WO3) is a promising electrochromic material with exceptional characteristics. This review summarizes the background and evaluation criteria of WO3-based materials, focusing on preparation techniques and performance enhancement of WO3 films. Four methods, including nanostructuring and fabricating hybrid films, have been developed to improve the EC performance of WO3 films. The review also provides important recommendations and perspectives for future research.
Article
Materials Science, Multidisciplinary
Xin Zhao, Xiang Zhang, Zhiwei Yin, Wenjie Li, Changpeng Yang, Wenhai Sun, Hulin Zhang, Yao Li
Summary: In this work, W-doped NiO films were prepared by RF magnetron co-sputtering to improve the performance of NiO. The optical modulation of W-NiO was significantly improved compared with pure NiO, and the response time was similar to NiO film. The all-solid-state electrochromic devices (ECDs) employing W-NiO showed high modulation capabilities and great potential for applications in smart windows and spacecraft thermal control devices.
Article
Computer Science, Artificial Intelligence
Yunhan Kim, Taekyum Kim, Byeng D. Youn, Sung-Hoon Ahn
Summary: This research introduces an image-based deep transfer learning method for monitoring machining quality in laser-assisted micro-milling of glass. Experimental validation shows that this method has the best classification accuracy and is able to predict and improve machining quality.
JOURNAL OF INTELLIGENT MANUFACTURING
(2022)
Review
Green & Sustainable Science & Technology
Ji-Hyeon Song, Soo-Hong Min, Seung-Gi Kim, Younggyun Cho, Sung-Hoon Ahn
Summary: Significant advancements in nanomaterials and nanotechnology have driven research in various fields, leading to unexpected macroscopic phenomena and applications. However, the potential limitations of multi-functionalization call for research to explore different directions. Through enhancing performance, adding new properties, and considering multiple physics interactions, studies focus on sensors, actuators, energy harvesters, and solar cells. Efforts are directed towards increasing sensitivity, flexibility, and enabling wireless communication. Analysis of material trends, manufacturing processes, and useful fabrication methods aims to predict future research directions in sensing and multi-functional applications.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2022)
Article
Computer Science, Artificial Intelligence
Hyungjung Kim, Woo-Kyun Jung, Young-Chul Park, Jae-Won Lee, Sung-Hoon Ahn
Summary: This paper proposes a method for sewing defect detection using deep learning and a pre-trained VGG-16 model. Experimental results show that the proposed method achieves 92.3% accuracy in detecting real defects, and further investigation on reducing computation time for real-time performance is conducted.
EXPERT SYSTEMS WITH APPLICATIONS
(2022)
Article
Automation & Control Systems
Byung-Chan Kim, Dong-Wook Lim, Ji-Hun Kim, Hyun-Taek Lee
Summary: This study investigates the laser texturing of a metal surface to create a superhydrophobic surface and transfer the pattern onto a polymer. The results show that the corrosion resistance of the material improves with an increase in the aspect ratio of the pattern.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Textiles
Woo-Kyun Jung, Soo-Min Lee, Sung-Hoon Ahn, Juyeon Park
Summary: This study developed a multifunctional elbow brace using knitted shape memory alloy fabric, which provided both heat and pressure and increased the range of motion and blood flow in the elbow joint. The subjective evaluation and measurements of the brace demonstrated its applicability and positive effects, confirming the potential of smart textiles in wearable device development.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Materials Science, Multidisciplinary
Min-Soo Kim, Hye-Sung Lee, Younggyun Cho, Jae Kyung Heo, Ying-Jun Quan, Seung Woo Lee, Heui Jae Pahk, Sung-Hoon Ahn
Summary: This study proposes an IR light-driven SMA actuator that enhances light absorptance through the plasmonic effect, creating an optical meta-surface with sub-micrometer patterns. The absorptance tuning effect is evaluated through optics simulations, showing increased narrow-band IR light absorption by up to 55%. These actuators enable decoupled microscale actuation using UV and IR light, with a response similar to that of the iris muscle, expanding the applications of SMAs in clinical devices and soft robotics.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Engineering, Industrial
Kui-Kam Kwon, Dae-Seob Song, Ying-Jun Quan, Ji Ho Jeon, Sung-Hoon Ahn
Summary: In this study, a novel process for fabricating crackless high aspect ratio glass through-structures is proposed using laser-induced backside wet etching (LIBWE) and a detachably bonded glass cover. The process allows for the fabrication of high aspect ratio crackless structures with inexpensive machining devices, while inhibiting crack generation.
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Textiles
Soo-Min Lee, Woo-Kyun Jung, Juyeon Park, Sung-Hoon Ahn
Summary: With the global population aging, there is a growing demand for physical assistive devices for the elderly. This study developed a wearable gripping aid using a novel 4D material and ergonomic design, aiming to improve handgrip ability for elderly women.
FASHION AND TEXTILES
(2022)
Article
Green & Sustainable Science & Technology
Ji-Hyeon Song, Woo-Kyun Jung, Sung-Hoon Ahn
Summary: Among microscale printing processes, dry nanoparticle printing is an environment friendly process that does not require toxic chemicals. A laser process is often integrated as a hybrid system to improve the printing quality and overcome the poor adhesion problem. This study assesses the energy efficiency of the nanoparticle deposition system (NPDS) and the laser-enhanced nanoparticle deposition system (L-NPDS) using real-time power monitoring and theoretical modeling. Introducing laser energy increases the total energy efficiency by 3.78 times and confirms the recyclability of the nanoparticles through X-ray diffraction.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2023)
Review
Green & Sustainable Science & Technology
Jun Young Choi, Ji Ho Jeon, Jang Hyeon Lyu, Jungwoo Park, Geun Young Kim, Suk Young Chey, Ying-Jun Quan, Binayak Bhandari, B. Gangadhara Prusty, Sung-Hoon Ahn
Summary: The acceleration of environmental pollution and global warming has led to increased environmental awareness and regulations to reduce carbon emissions. The automotive industry is shifting towards electric vehicles and urban air mobility, where composites are gaining attention for their increased driving range and green mobility. However, the tradeoff between performance and cost has hindered the mass adoption of composites. The latest developments focus on the application of biodegradable composites and robotic automation in composite manufacturing for eco-friendly and cost-effective production.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ji-Hyeon Song, Young-Gyun Kim, Younggyun Cho, Seongheon Hong, Jun Young Choi, Min-Soo Kim, Sung-Hoon Ahn
Summary: Wearable strain sensors with stretchability and biocompatibility were designed and fabricated using a kirigami-cut PVDF film. The developed sensor can measure strain and strain rate simultaneously, and the piezoelectric performance depends on both strain and strain rate. The relationship between voltage and voltage change rate can be analyzed to detect strain and strain rate. The sensor's performance was evaluated using different kirigami patterns, and it was successfully used for athlete rehabilitation and posture monitoring.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Automation & Control Systems
Dong-Wook Lim, Seong-Wook Hong, Seok-Jae Ha, Ji-Hun Kim, Hyun-Taek Lee
Summary: Laser machining is widely used in micro/nanomachining due to its noncontact nature, environmental friendliness, high level of automation, and short process time. The precision of both the laser and optical systems and motion control systems are crucial for micro/nanomachining. Residual vibrations generated during the motion of machine parts reduce precision at the micro/nanoscales. In this study, the input-shaping method was applied to a high-rigidity motion system for precision laser machining to reduce residual vibrations.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Dae-Seob Song, Ji-Hyeon Song, Sung-Hoon Ahn
Summary: In this study, a facile process was developed to print a 3D microstructure of silver nanoparticles (Ag NPs) for antibacterial applications. The printed Ag NP mesh retained the properties of Ag NPs, and various mesh sizes and porosities were evaluated as antibacterial filters. A prototype water filter with three mesh layers effectively filtered out all active bacteria, demonstrating the viability of the proposed Ag NP 3D printing process for manufacturing antibacterial microstructures.
ACS APPLIED NANO MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Young-Gyun Kim, Ji-Hyeon Song, Seongheon Hong, Sung-Hoon Ahn
Summary: In this study, a high-performance kirigami piezoelectric strain sensor was developed and successfully applied in a haptic glove for playing musical instruments. The sensor exhibits high sensitivity, stretchability, and tunability.
NPJ FLEXIBLE ELECTRONICS
(2022)
Article
Engineering, Manufacturing
Daenyoung Kim, Yoo-Seok Kim, Ki Young Song, Sung Hoon Ahn, Chong Nam Chu
Summary: This study proposes two methods to promote the flow of dielectric fluid in order to overcome the challenges in machining aluminum nitride. The experimental results show different effects on material removal rate and tool wear.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2022)
