Article
Chemistry, Multidisciplinary
Ji Yong Choi, Minyan Wang, Brianna Check, Michael Stodolka, Kyle Tayman, Sandeep Sharma, Jihye Park
Summary: This article reports the synthesis of Cu-3(HAB)(x)(TATHB)(2-x) with improved crystallinity and higher electrical conductivity compared to previous studies. The ligand compositions in the framework are precisely controlled by precursor ratios. The electrical conductivity can be tuned by increasing the nitrogen content in the crystal lattice. Computational calculations support the idea that the solid solution facilitates band structure tuning. These findings shed light on the structure-property relationship and open new possibilities for synthesizing electrically conductive metal-organic frameworks (MOFs) for optoelectronic device applications.
Article
Materials Science, Ceramics
Cheng Ruan, Qiang Sun, Dongjie Xiao, Hangyu Li, Guodong Xia, Sumei Wang
Summary: This paper describes a simple and low-temperature sol-gel method for fabricating high-quality transparent conductive oxide (TCO) films. By using lightwave (LW) irradiation, high-quality indium-tin-oxide (ITO) films with excellent electronic properties and high transmittance can be achieved. This method provides a low-cost approach to producing high-performance TCO films for affordable flexible large-area devices.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Yang Liu, Qingdong Zeng, Changjiang Nie, Huaqing Yu
Summary: F, Mg and Ga co-doped ZnO (FMGZO) films were deposited on glass substrates at room temperature using magnetron sputtering. The effects of RF sputtering power on the structure, morphology, composition, electrical and optical properties of the films were investigated. The results showed that the FMGZO film deposited at an RF sputtering power of 15 W exhibited excellent electrical and optical performance, surpassing previously reported co-doped ZnO films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
David Tilve-Martinez, Wilfrid Neri, Dylan Horaud, Nicolas Vukadinovic, Benoit Berton, Arnaud Desmedt, Jinkai Yuan, Philippe Poulin
Summary: Digital Light Processing (DLP) technology enables fast and high-resolution 3D printing, but it is limited to transparent resins and not suitable for printing conductive materials. In this study, a UV transparent liquid crystal graphene oxide precursor is used to generate in situ conductive particles in a photopolymerizable resin. The resin can sustain high temperature for the thermal reduction of graphene oxide into electrically conductive reduced graphene oxide particles. This method reconciles the DLP technology with the manufacturing of 3D electrically conductive objects.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Physical
Zhamatuofu Bai, Sheng-Chi Chen, Song-Sheng Lin, Qian Shi, Ying-Bo Lu, Shu-Mei Song, Hui Sun
Summary: This study provides a comprehensive understanding of the optoelectronic properties of CuCrO2, discussing its crystal structure, XRD spectrum, and advantages in optoelectronic devices. The study concludes that CuCrO2 exhibits best optoelectronic performance among delafossite materials and discusses band structure calculations and p-type conductivity analysis. Additionally, it highlights recent progress on intrinsic CuCrO2 and Mg/Ni doping CuCrO2, as well as prospects for future research directions.
SURFACES AND INTERFACES
(2021)
Article
Materials Science, Ceramics
V. O. Anyanwu, M. K. Moodley
Summary: Aluminium doped with zinc oxide (98 wt %) (AZO) thin films were fabricated on glass substrates using pulsed laser deposition (PLD) technique, showing nanoscale structures and morphology. The deposition was performed at chosen substrate temperatures and low partial pressure. A laser energy density of 4 J/cm2 was utilized, which effectively ablated the bulk AZO and minimized droplets arrival on the substrates. The AZO films exhibited crystallite sizes ranging from 31.1 to 45.4 nm, and the lowest resistivity was achieved at 6.8 x 10-5 ohm cm with an average optical transmittance of 83% in the UV-vis-NIR region. The PLD technique provides a significant avenue for crack-free and reliable thin film growth with improved electrical and optical properties.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Shaofeng Huang, Ji Yong Choi, Qiucheng Xu, Yinghua Jin, Jihye Park, Wei Zhang
Summary: Two covalent organic frameworks, MC-COF-1 and MC-COF-2, consisting of carbazolylene-ethynylene shape-persistent macrocycles with azine or imine linkages, were synthesized via imine condensation. The 2D frameworks are fully conjugated, imparting semiconducting properties, and exhibit high porosity with aligned porous channels. The frameworks can be doped with I-2 to enable electrical conductivity and have switchable electrical properties between conducting and insulating states.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Nikola Kanas, Benjamin A. D. Williamson, Frank Steinbach, Richard Hinterding, Mari-Ann Einarsrud, Sverre M. Selbach, Armin Feldhoff, Kjell Wuek
Summary: The thermoelectric properties of CaMnO3-delta/CaMn2O4 composites were tuned via microstructuring and compositional adjustment. The nature of the CaMnO3-delta/CaMn2O4 grain boundary was analyzed by transmission electron microscopy and confirmed to have a sharp interface with no secondary phase formation. Density functional theory (DFT) calculations predict oxygen vacancy segregation at the interface, resulting in enhanced electronic conductivity of the CaMnO3-delta phase.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Zhaoyang Li, Jiwen Li, Mei Xiong, Jinkun Lei, Yiyi Chen, Shengkang Zhang
Summary: This study investigates the effects of Mo single-doping and Mo-Al co-doping on the optical and electrical properties of ZnO thin films. The results show that Mo doping improves carrier concentration and conductivity in ZnO films, while excessive doping leads to the refinement of grain size and the emergence of potential energy traps. However, Mo-Al co-doping enhances the optical properties and introduces Mo5+ into the films. The study also reveals that Mo-4d impurity states appear in the valence band and contribute to the increase of absorption rate and decrease of transmittance in the films.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Haoyu Chai, Hui Li, Fei Zhong, Zhen Xu, Shengqiang Bai, Lidong Chen
Summary: The choice of solvent for film preparation has a significant impact on the film morphology, doping level, and charge transport behavior, and thus affects the electrical conductivity. Crystallinity plays a key role in charge transport properties.
Article
Polymer Science
Dieter Rahmadiawan, Hairul Abral, Rafi Alzues Kotodeli, Eni Sugiarti, Ahmad Novi Muslimin, Ratna Isnanita Admi, Andril Arafat, Hyun-Joong Kim, S. M. Sapuan, Engkos Achmad Kosasih
Summary: This study successfully prepared and characterized an all-cellulose film from TEMPO-oxidized bacterial cellulose (TOBC) powders without adding metal compounds through ultrasonication. It was found that increasing the ultrasonication power level significantly improved the properties of the film.
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
Materials Science, Multidisciplinary
Simiao Wu, Ningtao Liu, Hui Li, Jinfu Zhang, Shengcheng Shen, Wei Wang, Ning Xia, Yanwei Cao, Zhicheng Zhong, Wenrui Zhang, Jichun Ye
Summary: This study demonstrates the use of Hf doping strategy to enhance the conductivity and widen the bandgap of epitaxial beta-Ga2O3 thin films. By fabricating Hf-doped beta-Ga2O3 films with different doping ratios, the impact of doping on structural, optical, and transport properties is investigated. Optimized doping of 1%-2% in molar ratio results in high n-type conductivity, carrier mobility, carrier concentration, and an ultrawide bandgap. Additionally, density functional theory calculations reveal the atomic site preference of Hf dopants and their impact on the optical bandgap.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Nasser S. S. Awwad, Hala A. A. Ibrahium, M. F. H. Abd El-Kader, H. Elhosiny Ali, Ayman M. M. Mostafa, A. A. Menazea
Summary: In this study, chitosan-PEO/V2O5 NPs composite films were successfully synthesized using one-potential laser ablation method. The properties of the synthesized films were characterized using XRD, UV-Vis, SEM, and Ac conductivity. The results showed the complexation between V(2)O(5) NPs and chitosan-PEO matrix, and a decrease in optical bandgap after doping with V2O5 NPs. The AC conductivity also exhibited frequency-dependent behavior.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Bahar Atik, Emrah Dirican, Oytun Demirors, Hakan Altan, Okan Esenturk, Mustafa Yildirim, Tayfun Akin
Summary: This study demonstrates that W-doping introduces new phases and supports the formation of new V-phases. The new V-phase, V2O5, dominates the overall electrical properties. Terahertz Time-Domain Spectroscopy (THz-TDS) is used as a nondestructive characterization technique to monitor the effects of doping on the electrical behavior of VxOy films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Mazharul Haque, H. Fouad, Hyung-Kee Seo, Othman Y. Alothman, Z. A. Ansari
IEEE SENSORS JOURNAL
(2020)
Article
Engineering, Electrical & Electronic
Zeenat Khatoon, H. Fouad, H. K. Seo, Mohamed Hashem, Z. A. Ansari, S. G. Ansari
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Chemistry, Multidisciplinary
Yeongbeom Kim, Hyungkee Seo, Eunbi Kim, Jaekwang Kim, Inseok Seo
Article
Energy & Fuels
Hyeonsu Lim, Dan Na, Cheul-Ro Lee, Hyung-Kee Seo, O-Hyeon Kwon, Jae-Kwang Kim, Inseok Seo
Summary: This study presents an integrated device that combines a lithium-ion battery with silicon solar cells, allowing for the charging of the battery using solar energy. The study also highlights the electrochemical characteristics of the graphite and NCM cathode, demonstrating good cycle stability.
Article
Energy & Fuels
Ashique Kotta, Eun-Bi Kim, Inseok Seo, Zubaida A. Ansari, Hyung Kee Seo
Summary: This study introduces a facile method for high-quality perovskite films in perovskite solar cell production by using C12F4N4 as an additive under moderate humidity, bridging the grain boundaries and significantly enhancing photovoltaic parameters as well as overall power conversion efficiency.
Article
Engineering, Environmental
Ashique Kotta, Inseok Seo, Hyung-Shik Shin, Hyung-Kee Seo
Summary: Metal oxide-based electrodes, particularly vanadium (V)-substituted NiO nanomaterial, have been found to enhance the electrical conductivity and improve the surface wetting of perovskite films in perovskite solar cells (PSCs). The presence of V5+ significantly boosts the electrical conductivity of the NiO film, promoting charge transport and reducing interfacial charge accumulation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Biochemistry & Molecular Biology
Abdullah, Sei-Jin Lee, Jong Bae Park, Yang Soo Kim, Hyung-Shik Shin, Ashique Kotta, Qamar Tabrez Siddiqui, Youn-Sik Lee, Hyung-Kee Seo
Summary: A linear-shaped small organic molecule, MBTR, synthesized and analyzed, efficiently tuned the thermal, absorption, and emission characteristics to enhance the molecular packing and aggregation behaviors in the solid state. The optimized MBTR:PC71BM fullerene-based devices showed a maximum PCE of 7.05%, and with the addition of 3% DIO, the PCE improved to 8.76%, demonstrating the effective approach of introducing suitable donor/acceptor groups in enhancing the photovoltaic performances of organic solar cells.
Article
Chemistry, Analytical
Ahmad Umar, Mazharul Haque, Shafeeque G. G. Ansari, Hyung-Kee Seo, Ahmed A. A. Ibrahim, Mohsen A. M. Alhamami, Hassan Algadi, Zubaida A. A. Ansari
Summary: In this study, label-free myoglobin detection for identifying acute myocardial infarction was successfully achieved using Cu-TiO2 nanostructures as the base matrix. The Cu-TiO2 nanomaterials exhibited good crystallinity and high purity, and the fabricated Mb biosensor showed high sensitivity and low detection limit.
Article
Materials Science, Multidisciplinary
Abdullah, Sei-Jin Lee, Jong Bae Park, Yang Soo Kim, Hyung-Shik Shin, Ashique Kotta, Hyung-Kee Seo
Summary: In this study, two symmetric donor-pi-acceptor-pi-donor-type pi-conjugated small molecule donors (BTM and BTP) were synthesized and systematically analyzed for their structural, thermal, optical, and electrochemical properties. The BTP-based organic solar cells showed a higher power conversion efficiency (PCE) of approximately 7.08% compared to the BTM-based devices (approximately 4.86%), attributed to the precisely tuned optical bandgap, desired morphology, improved interfacial properties, and deep-lying HOMO energy level and low LUMO energy offset. Furthermore, the BTP:PC71BM (1:2.5, w/w) devices exhibited high stability at room temperature, retaining 6.70% of their original PCE (7.08%) after 288 hours.
Article
Electrochemistry
Ashique Kotta, Eun-Bi Kim, Sadia Ameen, Hyung-Shik Shin, Hyung Kee Seo
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2020)
