Article
Materials Science, Multidisciplinary
Chandra Kumar, Vikas Kashyap, Monika Shrivastava, Fernando Guzman, Kapil Saxena
Summary: The influences of annealing on the optical properties of Cu-doped CdS thin films deposited by spray pyrolysis were investigated. The results showed that the size of the thin films increased with increasing annealing temperature. The band-gap of the films decreased from 2.79 eV to 2.75 eV with increasing annealing temperatures. The performances of Ag/CdS:Cu/FTO/glass Schottky diodes were discussed in detail, and the ideality factor, potential height, and series resistance of the diodes were estimated using various methods.
Article
Chemistry, Physical
Xiang Ding, Hao Shao, Hongxia Wang, Weidong Yang, Jian Fang, Daquan Zhang, Tong Lin
Summary: The use of a nanocomposite material made from polypyrrole and titanium dioxide nanoparticles has significantly improved the electrical output of a Schottky DC generator, achieving higher current output, power density, and energy conversion efficiency. This novel approach may lead to the development of high-performance Schottky DC generators.
Article
Chemistry, Physical
Qihao Zhang, Jiangwei Liu, Chunming Tu, Dongyuan Zhai, Min He, Jiwu Lu
Summary: High-performance beta-Ga2O3-based Schottky barrier diodes (SBDs) and metal-semiconductor field-effect transistors (MESFETs) were fabricated on a highly doped epitaxial wafer. The electrical properties and stabilities of these devices after annealing were investigated. The results showed excellent ON/OFF ratios for all SBDs, and the MESFETs exhibited pinch-off and saturation characteristics with high drain currents, surpassing previous reports. The study provides valuable insights for the development of practical applications of beta-Ga2O3-based electronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Polymer Science
Cristina Cazan, Alexandru Enesca, Luminita Andronic
Summary: TiO2 nanocomposites as reinforcement agents significantly enhance mechanical properties, with filler size playing a crucial role. The increase in interfacial area due to small fillers leads to the generation of an interface polymer volume fraction with properties different from bulk polymer, even at low loadings. The paper focuses on the influence of composition and technological parameters on the mechanical strength of TiO2 nanocomposites with polymeric matrix.
Article
Engineering, Electrical & Electronic
Rajkumar Dey, Shamima Hussain, A. K. Pal
Summary: Cellulose nano-fibers were used to fabricate a flexible paper and a simple Ag/CdS/Au Schottky diode was successfully created on it. Characterization and testing were conducted to evaluate the quality of the diode.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Analytical
Dominik Korol, Anna Kisiel, Maciej Cieplak, Agata Michalska, Piyush Sindhu Sharma, Krzysztof Maksymiuk
Summary: Electrochemically active molecularly imprinted polypyrrole nanoparticles (PPy NPs) were synthesized using micelles. The NPs with estriol imprinting were prepared by polymerizing pyrrole with the aid of iron(III) p-toluenesulfonate. SEM and TEM confirmed the synthesis of imprinted PPy NPs around 60 nm in size. The NPs prepared with pristine pyrrole showed an imprinting factor of 4.2, while those prepared with derivatized pyrrole showed no imprinting. The electrochemical-based transduction allowed for the determination of estriol in a concentration range of 0.5-5 μM and 10-100 μM, with a limit of detection (LOD) of 0.16 μM. The MIP NP-coated electrode exhibited satisfactory selectivity towards estriol and its structural analogs.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Engineering, Electrical & Electronic
Ali Jabbar Fraih, Muneer H. Jaduaa Alzubaidy
Summary: This study investigates the impact of the number of graphene layers on the optoelectronic properties of the graphene/silicon heterojunction Schottky diode. The single-layer sample exhibited the highest responsivity in red light. The response of the samples to all wavelengths decreased with increasing temperature, and the response stability to light was favorable with less than a 2% change observed after one month.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Polymer Science
Fatih Biryan, Hilal Celik, Eray Caliskan, Kenan Koran
Summary: In this study, cinnamic acid side chain bearing polymer and its ferrocene-modified polymer were synthesized. The addition of a ferrocene unit improved the optical and electrical properties of the target polymer. The fabricated diode showed rectifier behavior and exhibited unique electrical properties due to the characteristics of the organic polymer.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Guoqing Shao, Juan Wang, Zhangcheng Liu, Yanfeng Wang, Wei Wang, Hong-Xing Wang
Summary: Introducing LaB6 into diamond SBD can improve its SBH and reverse breakdown capability. LaB6 significantly reduces the interface states density of diamond SBD, showing great potential for higher performance.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Chemistry, Physical
M. Kamruzzamana, J. Antonio Zapien, M. Rahman, R. Afrose, T. Khairul Anam, M. Nurul Huda Liton, M. Al-Helal, M. Khalilur Rahman Khan
Summary: MoS2 is an alternative to graphene with intriguing properties, requiring modification for achieving p-MoS2 and complementary device applications. Doping with Ag and Ag-Cu has been investigated both theoretically and experimentally, revealing enhanced absorption in the visible region and confirmation of p-type MoS2 characteristics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Shaozhong Yue, Xuefeng Zheng, Yuehua Hong, Xiangyu Zhang, Fang Zhang, Yingzhe Wang, Ling Lv, Yanrong Cao, Xiaohua Ma, Yue Hao
Summary: This article studies the effect of hydrogen on b-gallium oxide (Ga2O3) (001) Schottky barrier diode (SBD) device for the first time. It is found that the electrical performance of the beta-Ga2O3 SBDs changed significantly after hydrogen treatment, with a decrease in turn-on voltage (V-on) by 0.3 V and an increase in forward (JF) current density by 28%. Frequency-dependent conductance technique reveals that the time constants decreased from 0.09-0.3 to 0.06-0.09 mu s after hydrogen treatment. The density of interface states and trap activation energy also decreased after hydrogen treatment. Time-of-flight secondary ion mass spectrometry (TOF-SIMS) shows an increased density of hydrogen at the Pt/Ga2O3 interface for the device with hydrogen treatment. The effect of hydrogen on Pt/Au beta-Ga2O3 SBDs is mainly attributed to the passivation of traps by hydrogen atoms near the Pt/Ga2O3 interface.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Zhenyu Qu, Wenhui Xu, Tiangui You, Zhenghao Shen, Tiancheng Zhao, Kai Huang, Ailun Yi, David Wei Zhang, Genquan Han, Xin Ou, Yue Hao
Summary: Surface activated bonding was used to fabricate n-Ga2O3/n(+)-Si heterojunction with an amorphous layer to decrease the current density of Ga2O3/Si Schottky barrier diodes. Simulation results showed that decreasing the Ga2O3 mole fraction and increasing the thickness of amorphous layers in the Ga2O3/Si hetero-interface dramatically reduced the current density and specific on-resistance in Ga2O3/Si SBDs. These findings provide guidance for improving the performance of vertical heterogeneous integration beta-Ga2O3 devices.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ruizhe Yang, Matthew Benner, Zipeng Guo, Chi Zhou, Jun Liu
Summary: Dynamic Schottky direct-current (DC) generators show great potential for energy harvesting, but the lack of understanding of DC generation in conducting polymer-based generators has hindered their applications. A high-performance, flexible Schottky DC generator demonstrated large current density and scaled-up DC output, inheriting flexibility from the long-chain polymer concept and showing promise for next-generation wearable devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Chang Wan Ahn, Sungsoo Park, Eun Kyu Kim
Summary: The defect states and electrical properties of AlxGa1-xN crystals were investigated, and the incorporation of oxygen atoms was found to improve crystal quality and suppress defect states.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
P. Vivek, J. Chandrasekaran, V. Balasubramani, A. Manimekalai, T. G. Vignesh Prabhu
Summary: Metal-insulator-semiconductor diodes with pure MoO3 and different weight % of Ga-MoO3 insulator layer were fabricated using JNSP techniques. The films exhibited multiphase orthorhombic and monoclinic structures, with Ga-based film (10 wt%) showing higher crystallite size. The electrical conductivity and photocurrent performance of the diodes were influenced by the Ga doping level, with the highest values observed for the 10 wt% Ga-doped film.
SURFACES AND INTERFACES
(2023)
Article
Green & Sustainable Science & Technology
Hyun Chan Kim, Lindong Zhai, Pooja S. Panicker, Hyun Jung Kim, David MacDonnell, Jaehwan Kim
Summary: This study introduced a new concept of membrane photon sieve (PS) based on cellulose nanofiber (CNF), which is transparent, flexible, lightweight, and has high strength. The PS fabrication on a CNF film using micro-nano structure molding technique was highlighted, showing structural stability in external environmental changes. Through high vacuum environment testing, CNF was proven to be a promising optical material with the prepared CNF-PS exhibiting high beam quality, showing potential for broad applications in thin and compact photonic devices.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2022)
Article
Materials Science, Paper & Wood
Pooja S. Panicker, Hyun Chan Kim, Dickens O. Agumba, Ruth M. Muthoka, Jaehwan Kim
Summary: In this study, nanocellulose long fibers (NCLFs) were continuously fabricated under an alternating current (AC) electric field, leading to improved mechanical properties. With increasing applied AC voltage, the NCLFs exhibited significant enhancements in Young's modulus, tensile strength, and toughness. The proposed method shows promise for fabricating strong and tough NCLF-reinforced polymer composites.
Article
Polymer Science
Ruth M. Muthoka, Pooja S. Panicker, Jaehwan Kim
Summary: This study used molecular dynamics simulation to investigate the alignment of cellulose under an electric field. The results showed that the electric field can induce the orientation of cellulose, and the alignment rate and ability depend on the field strength. Analysis of the cellulose structure revealed no significant effect of the electric field. The study highlights the importance of understanding cellulose alignment for developing new processing techniques.
Article
Chemistry, Multidisciplinary
Muhammad Latif, Yangxiaozhe Jiang, Bijender Kumar, Jong Min Song, Hyeon Cheol Cho, Jaehwan Kim
Summary: This study presents a simple and economical approach to manufacture 3D structures using high concentration nanocellulose paste cross-linked with citric acid. The optimized cross-linker greatly enhances the mechanical properties and shape fidelity of the 3D-printed nanocellulose structures.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Muhammad Latif, Yangxiaozhe Jiang, Bijender Kumar, Hyeon Cheol Cho, Jong Min Song, Jaehwan Kim
Summary: In recent years, the three-dimensional printing of environmentally friendly structures using high concentrations of nanocellulose (NC) has gained attention due to health and environmental concerns. This research presents an economical approach to printing such structures by directly extruding high-concentration NC paste and improving layer adhesion through the addition of low concentrations of polyvinyl alcohol (PVA). The resulting structures showed higher mechanical properties and shape fidelity compared to previous studies.
ACS APPLIED NANO MATERIALS
(2022)
Article
Polymer Science
Le Van Hai, Duc Hoa Pham, Jaehwan Kim
Summary: This study reports on the effects of multiple stage bleaching on compressed wood. After bleaching, the wood specimens became denser, and the porous structures collapsed. Changes in lignin content, alpha-cellulose content, and mechanical properties were observed.
Article
Chemistry, Multidisciplinary
Pooja S. Panicker, Dickens O. Agumba, Jaehwan Kim
Summary: This study reports a synergistic approach of wet spinning and coating cellulose nanofiber (CNF) with a bio-based and hydrogen-bonded polyvinyl alcohol-citric acid-lignin (H-PCL) resin, followed by esterification to form esterified poly(vinyl alcohol)-citric acid-lignin (E-PCL)-NCLF. The prepared fiber showed significant enhancements in mechanical properties, hydrophobicity, antioxidant activity, and thermal stability, making it a promising candidate for all-green natural fiber-reinforced polymer composites.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Dickens O. Agumba, Bijender Kumar, Pooja S. Panicker, Jaehwan Kim
Summary: This paper reports a biobased-interlayer glass composite that enhances the flexural strength and stiffness of glass while providing UV protection. The composite consists of benign materials and demonstrates improved mechanical properties compared to pure glass. It also effectively shields UV radiation and maintains high transparency in the visible range. This novel composite has potential applications in various fields such as greenhouse cover, automobile windshields, security, and museum artwork.
Article
Polymer Science
Muhammad Latif, Yangxiaozhe Jiang, Jongmin Song, Jaehwan Kim
Summary: Additive manufacturing technology has revolutionized the manufacturing process of polymer composites by enabling the construction of complex products with unique materials, functions, and structures. However, the printing of high-concentration nanocellulose structures using this technology often faces challenges related to adhesion and shape fidelity. This research presents an economical approach to fabricate structures by printing high-concentration nanocellulose layer-wise patterns. The study demonstrates the successful fabrication of two different composites and highlights the importance of optimal blend compositions and resin infusion methods in achieving high mechanical strength and interface adhesion.
Article
Materials Science, Multidisciplinary
Bijender Kumar, Samia Adil, Jaehwan Kim
Summary: Developing robust bio-based epoxy is crucial for creating environmentally friendly and high-performance natural fiber-reinforced composites. The synthesis of a bio-based vanillin epoxy (VE) from lignin-derived vanillin, mixed with a 4,4'-diaminodiphenyl methane (DDM) hardener, and infused in high-cellulose-containing alkali-treated jute fiber (TJF) mats, enhances adhesion and compatibility compared to petroleum-derived epoxy. The resulting VE-DDM/TJF composite exhibits excellent mechanical properties and resistance to environmental factors, making it a promising material for structural applications.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Materials Science, Characterization & Testing
Samia Adil, Bijender Kumar, Pooja S. Panicker, Duc Hoa Pham, Jaehwan Kim
Summary: Developing high-performance composite materials from biobased resources is contributing to sustainability. This study presents a green composite made of cellulose long filaments (CLFs)-reinforced Vanillin Epoxy (VE) produced by vacuum-assisted resin transfer and compression molding techniques. The CLFs reinforcement significantly improved the flexural strength and modulus of the biobased VE resin by 135.1% and 542.8%. The green composite exhibited good thermal stability and hydrophobic properties with a Tg of 144 degrees C and a water contact angle (WCA) of 96.4o. Strong interactions between CLFs and the biobased VE epoxy resin were observed through SEM and FTIR analysis. These characteristics make the proposed green composite a robust material for environmentally friendly and high-performance structural applications.
Article
Polymer Science
Dinesh, Bijender Kumar, Jaehwan Kim
Summary: In this study, lignocellulosic pine needle fibers (PNFs) were used as a reinforcement in the thermoplastic elastomer styrene ethylene butylene styrene (SEBS) matrix to create environmentally friendly and economical PNF/SEBS composites. The addition of a maleic anhydride-grafted SEBS compatibilizer resulted in strong chemical bonds forming between the PNF, compatibilizer, and SEBS polymer, leading to enhanced interfacial adhesion in the composites. The prepared composites exhibited higher mechanical properties, as well as better dynamic mechanical behavior, indicating their potential for engineering applications.
Article
Chemistry, Multidisciplinary
Dickens O. Agumba, Duc Hoa Pham, Jaehwan Kim
Summary: The use of all-natural, biocompatible, and degradable materials in the production of straws and films has resulted in superior performance and potential for sustainable development.
Article
Chemistry, Multidisciplinary
Mijin Won, Gyeongseok Oh, Hyunah Lee, Jaehwan Kim, Dong-Soo Kim
Summary: This paper presents a method for manufacturing humidity sensors on curved surfaces using 3D printing technology. The sensors are fabricated by printing electrodes on flat and 3D curved glass substrates, and coating cellulose nanofibers as a sensing layer. The sensors demonstrate high repeatability and sensitivity.
Review
Polymer Science
Bijender Kumar, Dickens O. Agumba, Duc H. Pham, Hyun Chan Kim, Jaehwan Kim
Summary: This review article discusses the synthesis, properties, and applications of EU-based resins in coating applications, emphasizing their excellent performance and potential for development. Despite limited research, the interest in design strategies and properties of EU-based resins has been increasing due to their low cost and environmentally friendly characteristics.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)