Article
Optics
B. Sundarakannan, M. Kottaisamy
Summary: The red-emitting zinc oxide material prepared exhibits a broad band emission under blue light excitation with a peak emission at 540 nm and strong infrared light absorption. When excited by blue LEDs, it emits bright broad band red light with a peak emission at 625 nm and a CIE chromaticity value of (x=0.65, y=0.37).
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Yuan Yuan, Xulan Xue, Ting Wang, Xiaochun Chi, Rong Wang, Wenyu Ji
Summary: In this study, a PEI-modified s-ZnO electron-transporting layer was fabricated to replace conventional ZnO nanoparticles, resulting in improved current efficiency and external quantum efficiency of QLEDs.
ORGANIC ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Aniruddh Bahadur Yadav, Gopal Rawat, Basavaraj S. Sannakashappanavar
Summary: This paper presents the preparation of Sn doped ZnO thin films using a low-cost chemical sol-gel spin coating process and the deposition of Ohmic and Schottky electrodes to form a Metal-Semiconductor-Metal (MSM) structure. The UV detection capability of the device was analyzed through electrical characterization, and various parameters including saturation current, ideality factor, and barrier height were calculated. The results showed an increase in forward and reversed bias current when exposed to UV light, and the responsivity and series resistance of the device were also reported.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Yongmin Shin, Hyungwoo Suh, Byoung-Hwa Kwon, Joonho Park, Hyunsu Cho, Chul Woong Joo, Sukyung Choi, Jin-Wook Shin, Chan-mo Kang, Dae Hyun Ahn, Won Jun Lee, Yong-Hoon Kim, Junho Jang, Byeong-Soo Bae
Summary: Organic-inorganic hybrid perovskite nanocrystals have superior optical properties but poor environmental stability. By using siloxane hybrid materials, we have improved the stability of PNCs and achieved stable color-converting layers.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Jipeng Jing, Lihua Lin, Kaiyu Yang, Hailong Hu, Tailiang Guo, Fushan Li
Summary: In this study, sol-gel derived lithium-doped zinc oxide (LZO) film is used as an electron transport layer (ETL) for inverted red quantum dot light-emitting diodes (QLED) to achieve low-cost and high-efficiency QLED. Lithium doping can tune the conduction band minimum, density of oxygen defects, and conductivity of zinc oxide, resulting in significantly improved external quantum efficiency (EQE) and current efficiency of the QLED device.
ORGANIC ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Jipeng Jing, Lihua Lin, Kaiyu Yang, Hailong Hu, Tailiang Guo, Fushan Li
Summary: Sol-gel derived lithium-doped zinc oxide film serves as an electron transport layer for inverted red QLED, achieving low-cost and high-efficiency device. Li-doping can tune the conduction band minimum, oxygen defect density, and conductivity of ZnO, leading to improved external quantum efficiency and current efficiency of the device.
ORGANIC ELECTRONICS
(2022)
Article
Chemistry, Physical
Yanyan He, Lulu Zhang, Guantong Chen, Yuanhong Liu, Shuangshuang Shi, Panpan Jiang, Jie Ding, Shu Xu, Chong Geng
Summary: A facile one-pot strategy to grow crystalline ZnO/SiO2 dual-layer encapsulation on CsPbBr3 perovskite nanocrystals (PNCs) has been reported. The encapsulation provides robust surface passivation to withstand the harsh conditions in hybrid light-emitting diodes (LEDs). The ZnO/SiO2 encapsulated PNCs show excellent stability, preserving 100% of their initial photoluminescence intensity after 500 hours of continuous irradiation.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Leandro L. Peres, Camila M. Cholant, Rafaela M. J. Lemos, Marco P. Rodrigues, Luana U. Kruger, Richard Pereira, Wladimir H. Flores, Andre Gundel, Douglas L. da Silva, Agnieszka Pawlicka, Cesar O. Avellaneda
Summary: The study used the peroxovanadate sol-gel method to produce ZnO-doped V2O5 thin films, demonstrating that ZnO doping improved the cyclic stability and reversibility of the films and resulted in a mixture of crystalline phases.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Leandro L. Peres, Camila M. Cholant, Rafaela M. J. Lemos, Marco P. Rodrigues, Luana U. Krueger, Richard Pereira, Wladimir H. Flores, Andre Guendel, Douglas L. da Silva, Agnieszka Pawlicka, Cesar O. Avellaneda
Summary: This study used the peroxovanadate sol-gel method to produce ZnO-doped V2O5 thin films and investigated the effect of doping on the electrochromic and structural characteristics of the films. The results showed that ZnO doping improved the cyclic stability and reversibility of the films, making them promising candidates for electrochromic device applications.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Optics
Qiang Ren, Yujing Zhao, Xiulan Wu, Ou Hai
Summary: The research successfully synthesized single-phase phosphor samples co-doped with Tb3+/Eu3+/Tm3+ in LaAl2.03(B4O10)O-0.54, demonstrating potential application value in the field of white-emitting phosphors.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Haifeng Tang, Kai Zhang, Fangxu Dai, Yunhu Wang, Tongping Zhang, Lei Wang, Jun Xing
Summary: The operational stability of perovskite light-emitting diodes (PeLEDs) can be enhanced by modifying the hole transport layer (HTL) material, poly(3,4-ethylene dioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS), with alkylamines, which neutralize its acidity and improve its hydrophobicity.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Hongwei Yu, Long Chen, Shihao Liu, Letian Zhang, Wenfa Xie, Chun-Sing Lee
Summary: By ionization process, the maximum external quantum efficiency of organic light-emitting diodes can be improved while reducing the adverse effects at high luminance.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Irshad Ahmad, Shazia Shukrullah, Muhammad Yasin Naz, Muhammad Athar Rasheed, Mukhtar Ahmad, Ejaz Ahmed, Muhammad Shoaib Akhtar, N. R. Khalid, Abid Hussain, Sadia Khalid
Summary: Decorating carbon nanotubes onto Sr doped ZnO nanoparticles resulted in a highly efficient photocatalyst for hydrogen evolution under visible light illumination. The improved hydrogen evolution activity of Sr doped ZnO/CNTs is attributed to high surface area, Sr doping, and construction of heterojunction, extending light absorption and improving charge separation. The proposed photocatalytic mechanism is based on Mott-Schottky study, explaining the interfacial charge transfer process from ZnO to CNTs and Sr.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Nanoscience & Nanotechnology
Arnab De, Bibek Samanta, Arnab Kumar Dey, Nisnat Chakraborty, Tapan Kumar Parya, Subhajit Saha, Uttam Kumar Ghorai
Summary: This study reports the synthesis of red light-emitting Li+ co-doped ZnAl2O4:Eu3+ nanophosphors by a modified sol-gel route, showing enhanced red emission intensity, improved color purity, and reduced nonradiative transitions.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Analytical
Hsin-Yi Wen, Yu-Shien Lu, Cheng-Yan Guo, Mei-Ying Chang, Wen-Yao Huang, Tung-Li Hsieh
Summary: The structure of the device used in this study is substrate/PMMA/ZnS/Ag/MoO3/NPB/Alq3/LiF/Al. The microstructure of the P4 substrate was found to enhance the device brightness. Analysis of AFM surface morphology, film resistance, and optical simulation results revealed that the microholes on the P4 substrate significantly contributed to the device performance. The reproducibility of the naturally formed holes was confirmed by fabricating devices with different emitting layer thicknesses.
Article
Nanoscience & Nanotechnology
Sehoon Chang, Ggoch Ddeul Han, Jonathan G. Weis, Hyoungwon Park, Olivia Hentz, Zhibo Zhao, Timothy M. Swager, Silvija Gradecak
ACS APPLIED MATERIALS & INTERFACES
(2016)
Article
Chemistry, Multidisciplinary
Stefanie Klein, Melek Kizaloglu, Luis Portilla, Hyoungwon Park, Tobias Rejek, Julian Huemmer, Karsten Meyer, Rainer Hock, Luitpold V. R. Distel, Marcus Halik, Carola Kryschi
Article
Chemistry, Physical
Markus Licklederer, Reza Mohammadi, Nhat Truong Nguyen, Hyoungwon Park, Seyedsina Hejazi, Marcus Halik, Nicolas Vogel, Marco Altomare, Patrik Schmuki
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Nanoscience & Nanotechnology
Baolin Zhao, Bastian Gothe, Marco Sarcletti, Yuhan Zhao, Tobias Rejek, Xin Liu, Hyoungwon Park, Peter Strohriegl, Marcus Halik
ADVANCED ELECTRONIC MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Yuanyuan Cao, Tobias Waehler, Hyoungwon Park, Johannes Will, Annemarie Prihoda, Narine Moses Badlyan, Lukas Fromm, Tadahiro Yokosawa, Bingzhe Wang, Dirk M. Guldi, Andreas Goerling, Janina Maultzsch, Tobias Unruh, Erdmann Spiecker, Marcus Halik, Joerg Libuda, Julien Bachmann
ADVANCED MATERIALS INTERFACES
(2020)
Article
Materials Science, Multidisciplinary
Baolin Zhao, Mikhail Feofanov, Dominik Lungerich, Hyoungwon Park, Tobias Rejek, Judith Wittmann, Marco Sarcletti, Konstantin Amsharov, Marcus Halik
FRONTIERS OF MATERIALS SCIENCE
(2020)
Article
Materials Science, Multidisciplinary
Marco Sarcletti, Hyoungwon Park, Janis Wirth, Silvan Englisch, Andreas Eigen, Dominik Drobek, Dustin Vivod, Bernhard Friedrich, Rainer Tietze, Christoph Alexiou, Dirk Zahn, Benjamin Apeleo Zubiri, Erdmann Spiecker, Marcus Halik
Summary: Research has shown that the use of custom-made superparamagnetic iron oxide nanoparticles can effectively remove nano-/microplastics pollutants of different origins, properties, and mixtures, with the best remediation performance for mixed nanoparticles. This method utilizes magnetic attraction and removal of nano-/microplastics, demonstrating universality and scalability, enabling effective remediation of contamination in water environments.
Article
Chemistry, Analytical
Jae-Hun Kim, Hyoungwon Park, Ali Mirzaei, Myung Gwan Hahm, Sanghoon Ahn, Marcus Halik, Changkyoo Park, Sang Sub Kim
Summary: Generating oxygen vacancies on SnO2 nanowires by femtosecond laser irradiation can enhance gas sensing properties, improving response to NO2 and toluene gases. Lower laser pulse energy leads to better sensing performance.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
Muhammad Ali, Evgeny Kataev, Johannes Mueller, Hyoungwon Park, Marcus Halik, Andreas Hirsch
Summary: The study focuses on hydrogen bonding interactions at the level of functionalized nanoparticles, showing enhanced binding affinities through orthogonal functionalization using receptors with multiple hydrogen bonding motifs. The modified surfaces of superparamagnetic iron oxide nanoparticles were fully characterized, with the number of attached ligands determined. The host-guest interactions on the surface showed significantly stronger binding affinities compared to molecular interactions in solution.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Hyoungwon Park, Jae-Hun Kim, Dustin Vivod, Sungil Kim, Ali Mirzaei, Dirk Zahn, Changkyoo Park, Sang Sub Kim, Marcus Halik
Summary: This study enhanced the sensing capabilities of semiconducting metal oxide-based gas sensors through a new post-modification method, improving gas selectivity; the chemical-affinity-driven interaction between SAM and gas molecules enabled selective gas sensing.
Article
Chemistry, Analytical
Hyoungwon Park, Jae-Hun Kim, Won-Sang Shin, Ali Mirzaei, Yoon-Jun Kim, Sang Sub Kim, Marcus Halik, Changkyoo Park
Summary: This study proposes an effective strategy to improve the selectivity and response of SnO2 nanowire-based gas sensors by adopting self-assembled monolayer functionalization and post-treatment femtosecond laser irradiation. The functionalization enhances gas selectivity by tuning surface chemical states, while the laser irradiation creates embossing surfaces and twin structures, improving gas adsorption and response.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Optics
Hyun Jong Yoo, Hyoungwon Park, Jeoung Han Kim, Changkyoo Park
Summary: In this study, a kilowatt level nanosecond pulsed laser was used to remove the paint layer on the surface of 304L stainless steel (SS304L). Different numbers of laser paint removal (LPR) process repetitions were applied and their influences on SS304L were analyzed. The complete removal of the paint layer was confirmed for nine (LPR 9) and twelve (LPR 12) repetitions using an electron probe X-ray microanalyzer (EPMA). Moreover, the LPR-induced microstructural modification was investigated using electron backscatter diffraction (EBSD), revealing smaller grain size and larger strain rate for a higher number of LPR process.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Henrik Gass, Marco Sarcletti, Lukas Mueller, Sabine Huebner, Tadahiro Yokosawa, Hyoungwon Park, Thomas Przybilla, Erdmann Spiecker, Marcus Halik
Summary: Besides their CO2 emissions when burned, hydrocarbons (HCs) are essential raw materials and commodities. HCs act as persistent pollutants with water as the main carrier, whether in the form of liquid oil spills or the abundance of plastic waste in the oceans. This study presents a water remediation method using superparamagnetic iron oxide nanoparticles (SPIONs) modified with self-assembled monolayers to effectively bind with HCs of different appearances and properties. The interaction relies on hydrophobic and Coulomb forces, enabling the recycling of SPIONs and their simple magnetic separation from water. The collected plastic waste also exhibits superior adsorption properties for crude oil, thus achieving upcycling. This surface modification approach allows the agglomeration and removal of organic contaminants from water, enabling a complete recycling loop.
Article
Green & Sustainable Science & Technology
Hyoungwon Park, Alexander May, Luis Portilla, Hanno Dietrich, Friedrich Muench, Tobias Rejek, Marco Sarcletti, Leena Banspach, Dirk Zahn, Marcus Halik
NATURE SUSTAINABILITY
(2020)
Meeting Abstract
Chemistry, Multidisciplinary
Hyoungwon Park, Marco Sarcletti, Marcus Halik
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Engineering, Electrical & Electronic
Bruno Galizia, Patrick Fiorenza, Corrado Bongiorno, Bela Pecz, Zsolt Fogarassy, Emanuela Schiliro, Filippo Giannazzo, Fabrizio Roccaforte, Raffaella Lo Nigro
Summary: This study demonstrates the growth of oriented AlN thin films on 4H-SiC substrates using PE-ALD technique, and investigates the impact of NH3 plasma pulsing on the microstructure and orientation degree of the AlN layers. The structural characterization reveals different polymorphic structures depending on the NH3 plasma pulsing time, and electrical nanoscopic characterization shows a correlation between the AlN crystalline phases and the insulating properties.
MICROELECTRONIC ENGINEERING
(2024)
Article
Engineering, Electrical & Electronic
Theo Levert, Alter Zakhtser, Julien Duval, Chloe Raguenez, Stephane Verdier, Delphine Le Cunff, Jean-Herve Tortai, Bernard Pelissier
Summary: In this study, the robustness of optical constants and optical band gap determination of three different materials is compared using a combination of spectroscopic ellipsometry and energy loss signal of X-ray photoelectron spectroscopy. The hybridization of these two techniques provides a new robust method for determining the band gap of the studied materials and other optical properties over a wide energy range.
MICROELECTRONIC ENGINEERING
(2024)