Article
Materials Science, Multidisciplinary
Hebing Hu, Shancheng Wang, Yun Meng, Guowei Liu, Ming Li, Tuan Duc Vu, Yi Long
Summary: Modern energy-saving buildings require windows with low mid-infrared emissivity and high visible transmittance, and this study reports a low epsilon(MIR) foil fabricated using silver nanowires, showing good energy-saving performance. Aligned AgNWs foils exhibit lower epsilon(MIR) and higher T-vis compared to randomly oriented AgNWs foils.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Applied
Jia-Sheng Tang, Cheng-Ying Lee, Ying-Chih Liao
Summary: A coating method is developed to produce chemical resistant transparent conductive films (TCFs) by mixing ultrasonicated cellulose nanofibers and silver nanowires (AgNWs). The resulting coating shows low sheet resistance, high transparency, excellent adhesion, and remains conductive under harsh conditions. Cross-linking with citric acid further enhances the chemical and mechanical stability of the TCF, making it suitable for optoelectronic applications.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Chemistry, Physical
Ranveer Singh, Hyunwoo Kang, Heechul Shin, Ji-Yong Park, Hyungtak Seo
Summary: The study investigated the 2DEG phenomenon at the interface of an amorphous-Al2O3-In2O3-amorphous-Al2O3 (AIA) heterostructure on a flexible substrate, showing promising opportunities for flexible oxide electronics. The AIA device exhibited a high stability with outstanding performance, and maintained good flexibility even after bending tests.
APPLIED SURFACE SCIENCE
(2022)
Article
Crystallography
Yanfei Dong, Dingwang Yu, Guochao Li, Yulin Cao, Youde Ruan, Mingtuan Lin
Summary: Researchers have developed an optically transparent and flexible metamaterial absorber, which can efficiently absorb electromagnetic waves in the frequency range of 6 GHz to 18 GHz and exhibit wide-angle properties. Additionally, it has a high transmittance rate in the visible light range.
Article
Nanoscience & Nanotechnology
Jianfang Liu, Yongjie Ge, Dumeng Zhang, Mei Han, Moxia Li, Meng Zhang, Xidong Duan, Zhilin Yang, Jiawen Hu
Summary: Plasma treatment has been shown to be an effective strategy for removing the insulating PVP layer from silver nanowire films and self-limited welding the NW/NW junctions, resulting in improved carrier transport properties without affecting transparency. The plasma-treated Ag NW film exhibited significantly enhanced conductivity and flexibility, making it suitable for applications such as high-performance flexible transparent heaters. Additionally, the plasma-treated Ag NW also demonstrated potential as a basic electrode in electron-only devices, significantly improving current collection efficiency.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Hee Seung Wang, Tae Hong Im, Young Bin Kim, Sang Hyun Sung, Seongwook Min, Sang Hyun Park, Han Eol Lee, Chang Kyu Jeong, Jung Hwan Park, Keon Jae Lee
Summary: Transparent flexible electrodes made of metallic nanowires have been hindered by multi-stacked morphology with large protrusions and high surface roughness, leading to leakage current and device malfunction. A solution involving plasmonic welding of flexible metal nanowires using flash lamps has been proposed to improve electrical and morphological properties. The flash-welded ultraflat electrode networks embedded with nanowires demonstrated reduced protrusion and surface roughness, showcasing excellent electrical properties and mechanical stability for practical applications.
Article
Chemistry, Physical
Lai-Peng Ma, Zhongbin Wu, Yukun Yan, Dingdong Zhang, Shichao Dong, Jinhong Du, Dongge Ma, Hui-Ming Cheng, Wencai Ren
Summary: This study successfully fabricates high-performance graphene FTEs for efficient flexible OLEDs by combining frustrated Lewis pair doping and nanostructure engineering. By depositing a p-type dopant on graphene electrode, both the light-extraction efficiency and charge injection efficiency are improved.
Article
Chemistry, Physical
Youngwook Noh, Hakyung Jeong, Jieun Park, Dongjin Lee
Summary: In this study, a flexible transparent conductive layer was fabricated using charge-assisted coating with silver nanowires, and subsequently applied in a transparent flexible heater, demonstrating high optical transmittance and electrical conductivity properties.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Youngwook Noh, Hakyung Jeong, Jieun Park, Dongjin Lee
Summary: Transparent conductive layers were fabricated using flexible silver nanowires and applied in a transparent flexible heater. The charge-assisted coating process and post-processing treatment improved the conductive and transparent properties of the layers. With a bias voltage of 5V, the heater exhibited a high heating temperature.
SURFACES AND INTERFACES
(2022)
Article
Computer Science, Information Systems
Chrysa Aivalioti, Alexandros Papadakis, Emmanouil Manidakis, Maria Kayambaki, Maria Androulidaki, Katerina Tsagaraki, Nikolaos T. Pelekanos, Constantinos Stoumpos, Mircea Modreanu, Gabriel Craciun, Cosmin Romanitan, Elias Aperathitis
Summary: This study enhanced the optical and electrical properties of NiO thin films through nitrogen doping, increasing their transparency to around 65% and achieving a direct band gap of up to 3.67 eV, with good output characteristics. The NiO:N/TiO2 heterojunction showed potential applications in optoelectronic devices.
Article
Chemistry, Physical
Jiwei Chen, Jiangwen Wang, Keyu Ji, Bing Jiang, Xiao Cui, Wei Sha, Bingjun Wang, Xinhuan Dai, Qilin Hua, Lingyu Wan, Weiguo Hu
Summary: In this study, a flexible, stretchable, and transparent InGaN/GaN multiple quantum wells (MQWs)/polyacrylamide (PAAM) hydrogel-based light emitting diode is demonstrated, which is coupled with the piezo-phototronic effect. The quantum well energy band and integrated luminous intensity can be significantly modulated by external mechanical stimuli. The integration of inorganic semiconductor materials and organic hydrogel materials shows great potential in the development of stretchable optoelectronic devices and emerging wearable devices and virtual reality applications.
Article
Nanoscience & Nanotechnology
Y-C Chien, T-L Shen, W-K Wu, C-Y Li, H-T Chin, C-W Chang, T-Y Lin, S-H Chang, J-L Shen, Y-F Chen
Summary: This study demonstrates a ultrathin, transparent, dual-side emitting and flexible light-responsive white LED based on a GIS structure. It achieves a high emission efficiency of around 9% and is based on a single emissive material with broadband emission property and low toxicity.
MATERIALS TODAY NANO
(2022)
Review
Computer Science, Information Systems
Yubu Zhou, Huayu Gao, Jing Wang, Fion Sze Yan Yeung, Shenghuang Lin, Xianbo Li, Shaolin Liao, Dongxiang Luo, Hoi Sing Kwok, Baiquan Liu
Summary: Organic light-emitting diodes (OLEDs) are a promising technology for displays and lighting due to their numerous advantages. Ultrathin emitting nanolayers (UENs) have been used to develop OLEDs without the doping technique, simplifying device structure and achieving comparable performance to doped devices. This review comprehensively summarizes recent progress in UEN-based OLEDs, including a comparison between doped and doping-free OLEDs, effective design approaches, and future development prospects.
Article
Chemistry, Multidisciplinary
Wei Jiang, Seokyeong Lee, Kaiying Zhao, Kyuho Lee, Hyowon Han, JinWoo Oh, Hyeokjung Lee, Hyerim Kim, Chong Min Koo, Cheolmin Park
Summary: The development of electrodes with high conductivity, optical transparency, and reliable mechanical flexibility and stability is important for numerous solution-processed photoelectronic applications. In this study, a flexible and transparent electrode suitable for a full-solution-processed quantum dot light-emitting diode (QLED) was fabricated by mixing MXene flakes with a highly conductive AgNW network. The resulting MXAg electrode exhibited low sheet resistance and high transparency. By adding a polymer buffer layer and controlling the amount of MXene in the hybrid film, the work function of the MXAg electrode could be tuned, enabling the development of a high-performance QLED with excellent bending stability and controllability.
Article
Optics
Yun Huang, Binze Ma, Arnab Pattanayak, Sandeep Kaur, Min Qiu, Qiang Li
Summary: This paper proposes an infrared camouflage device based on the Lambertian surface, which exhibits low emissivity, low specular reflectance, and high temperature tolerance. Experimental results show that the proposed surface can significantly reduce the target-background contrast compared to conventional low-emissivity smooth surfaces when camouflaging a target.
LASER & PHOTONICS REVIEWS
(2021)
Article
Multidisciplinary Sciences
Changyeong Jeong, Yong-Bum Park, L. Jay Guo
Summary: The introduction of an ultrathin silver film as a transparent electrode helps eliminate waveguide mode in OLEDs and enhances external quantum efficiency. By designing an OLED structure below the cutoff thickness of waveguide mode, waveguide mode can be effectively eliminated, promoting cost-effective high-efficiency OLEDs.
Article
Chemistry, Physical
Yunlong Zhang, Zhang Liu, Chengang Ji, Xinliang Chen, Guofu Hou, Yuelong Li, Xin Zhou, Xinghua Cui, Xiufang Yang, Chengchao Ren, Dong Liu, L. Jay Guo, Ying Zhao, Xiaodan Zhang
Summary: Transparent conductors are crucial for optoelectronic and flexible electronic devices, with oxide/metal/oxide (OMO) multilayer films showing promise as an alternative to traditional transparent conductive oxides (TCOs). However, deposition methods like magnetron sputtering or thermal evaporation can lead to device performance deterioration due to ion bombardment or high temperatures. New techniques, such as reactive plasma deposition (RPD) for high-quality MGZO films and ultrathin Ag films prepared by magnetron sputtering, are being explored to improve conductivity and transmittance in OMO structures.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Sangeon Lee, L. Jay Guo
Summary: This study investigates the mechanical and electrical characteristics of flexible transparent conductive electrodes under bending conditions and explains their failure mechanisms. The results show that a thin metallic layer can enhance the mechanical stability of the DMD, tune the mechanical properties of the cohesive layer, and improve the electrode fracture resistance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Heyan Wang, Yilei Zhang, Chengang Ji, Cheng Zhang, Zhengang Lu, Yunfei Liu, Zhibo Cao, Jing Yuan, Jiubin Tan, L. Jay Guo
Summary: This study introduces a method for efficient broadband microwave absorption by introducing strongly overlapped multi-cavity resonances, supported by multi-layer structures comprising of alternating graphene/silica pairs and ultrathin silver films. The design guidelines and complementary effects of different graphene layers on the microwave absorption mechanism are proposed for the first time. Experimental results show high absorption efficiency and visible transmittance of the proposed multi-layer structures.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Yong-Bum Park, Changyeong Jeong, L. Jay Guo
Summary: Understanding the electrical and optical properties of ultrathin metal films at sub-10 nm thickness is crucial for their application as transparent conductors. As the thickness approaches a critical value, a rapid change in the properties occurs, influenced by the film's inhomogeneity and size-effect contributions, leading to significant alterations in carrier scattering time, resistivity, optical loss, and transmission. The critical thickness serves as a key engineering metric for determining the maximum theoretical figure-of-merit for transparent conductors using thin metal films.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Benjamin A. Rorem, Tae H. Cho, Nazanin Farjam, Julia D. Lenef, Kira Barton, Neil P. Dasgupta, L. Jay Guo
Summary: We demonstrate the tunable structural color patterns using ALD technology. The color response can be precisely adjusted by tuning the thickness of zinc oxide layer. This method enables uniform and tunable coloration of nonplanar three-dimensional objects.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Anwesha Saha, Taigao Ma, Haozhu Wang, L. Jay Guo
Summary: Decorative chrome plating is widely used for attractive metal finishings, but it is hazardous to workers and harmful to the environment. To overcome these issues, we propose a multilayer thin film structure that mimics chrome appearance and achieve additional functionalities beyond decoration using a reinforcement learning algorithm. Experimental results show indistinguishable chrome color and validate the effectiveness of the inverse design approach.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Yun Zhang, Wei-Jie Feng, Wenkai Zhu, Xiwei Shan, Wei-Kuan Lin, L. Jay Guo, Tian Li
Summary: We demonstrate a universally applicable coloration strategy for polymer-based radiative cooling materials by nanoimprinting. By modulating light interference with periodic structures on polymer surfaces, specular colors can be induced while maintaining the hemispheric optical responses of radiative cooling polymers. The retrofit strategy is exemplified by four different polymer films with a minimum impact on optical responses compared to the pristine films. The potential roll-to-roll manufacturing empowers a scalable, low-cost, and easy-retrofitting solution for colored radiative cooling films.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Biomedical
Jennie J. Paik, Boonjae Jang, Sunghyun Nam, L. Jay Guo
Summary: This study presents a physically crosslinked poly(vinyl alcohol) (PVA)-based hydrogel that acts as a transparent strain-sensing skin adhesive for motion monitoring. By incorporating Zn2+ into the ice-templated PVA gel, a dense amorphous structure is observed, allowing the material to stretch up to 800% strain. Fabrication in a binary glycerol:water solvent results in electrical resistance in the k omega range, a gauge factor of 0.84, and ionic conductivity on the scale of 10(-4) S cm(-1), making it a promising low-cost candidate for stretchable electronic materials. The study also investigates the relationship between improved electrical performance and polymer-polymer interactions using spectroscopic techniques.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Wei-Jie Feng, Chengang Ji, L. Jay Guo
Summary: A full solution-based method is presented for fabricating multilayer thin film stacks for structural color applications, avoiding the need for high vacuum processes. Copper/silicon dioxide/copper (Cu/SiO2/Cu) and copper/titanium dioxide/copper (Cu/TiO2/Cu) are chosen as the model system due to their simple structure and tunable color. A systematic investigation is conducted to ensure good film quality and compatibility with previous layers. The manipulation of dielectric thickness and top Cu morphology on different substrates allows for the achievement of both primary and secondary colors.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Wei-Jie Feng, Yian Cheng, L. Jay Guo
Summary: This paper presents a new approach to understanding the spectral behavior of a Fabry-Perot-type trilayer stack for subtractive structural color using temporal coupled mode analysis. The cavity-based analysis can accurately fit reflection spectra and predict color chromaticity, even without considering material dispersion. The research shows that maximizing both absorptive and radiative decay rates, while matching them, is the key to producing the most chromatic color.
Review
Nanoscience & Nanotechnology
Danyan Wang, Zeyang Liu, Haozhu Wang, Moxin Li, L. Jay Guo, Cheng Zhang
Summary: Recent years have seen rapid development in the field of structural coloration, which is generated from the interaction of nanostructures with light. Compared to traditional color generation methods, structural coloration offers unique advantages in terms of spatial resolution, operational stability, environmental friendliness, and multiple functionality. This review discusses the recent developments in structural coloration based on layered thin films and optical metasurfaces. It covers the fundamentals of color science, physical mechanisms for structural color generation, optimization methods for efficient structure parameter searching, fabrication techniques for large-scale and low-cost manufacturing, device designs for dynamic displaying, and diverse applications in printing, sensing, and advanced photovoltaics.
Review
Chemistry, Multidisciplinary
Shengjun Zhou, Xiaoyu Zhao, Peng Du, Ziqi Zhang, Xu Liu, Sheng Liu, L. Jay Guo
Summary: This review introduces the application of patterned sapphire substrates (PSS) in III-nitride emitters and summarizes the fabrication methods and nanoscale patterned structure definitions of PSS. Research shows that PSS can reduce the threading dislocation density (TDD) in epilayers and enhance the light extraction efficiency. The structural parameters of PSS also have an impact on LED performances. Finally, the challenges and potential prospects of PSS in future LED development are proposed.