Article
Chemistry, Physical
Oleg Baranov, Martin Kosicek, Gregor Filipic, Uros Cvelbar
Summary: The paper presents a theoretical model for the growth of copper oxide nanowires, which quantitatively describes the single- and bi-crystalline growth mechanisms based on relevance analysis and experimental verification. Numerical simulations reveal the conditions for both mechanisms, shedding light on the control factors and basic mechanisms behind the growth modes.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Applied
Kaito Nakama, Mitsuki Yukimune, Naohiko Kawasaki, Akio Higo, Satoshi Hiura, Akihiro Murayama, Mattias Jansson, Weimin M. Chen, Irina A. Buyanova, Fumitaro Ishikawa
Summary: This study reports the growth of GaAs/GaInNAs/GaAs core-multishell nanowires with a triple quantum-well structure. The nanowires were grown via selective area plasma-assisted molecular beam epitaxy and exhibited finely controlled structures and targeted nitrogen concentrations.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Po-Heng Sung, Hsi-Kai Yen, Shu-Meng Yang, Kuo-Chang Lu
Summary: We report an efficient method of synthesizing undoped and K-doped rare cubic tungsten trioxide nanowires via thermal evaporation of WO3 powder. The reproducible and stable WO3 nanowires were obtained without using a catalyst. The growth process is low-cost and was conducted in a three-zone horizontal tube furnace with various processing parameters studied. The study also investigated the effects of potassium doping on the physical properties of the nanowires, revealing promising applications for sensors, field emitters, and light-emitting diodes.
Review
Chemistry, Multidisciplinary
Yize Su, Chenhao Wang, Zijian Hong, Wei Sun
Summary: Silicon nanocrystals have drawn significant attention in recent decades for their unique luminescent properties, with thermal disproportionation method offering precise control over their size and structure, showing promising industrial applications. Research has shown that factors such as temperature, Si/O ratio, and surface groups play a crucial role in determining the properties of silicon nanocrystals.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Physical
Jia Yan, Xuyun Guo, Ye Zhu, Zhilong Song, Lawrence Yoon Suk Lee
Summary: Doping transition metal atoms into ultrathin SnO2 QWs can enhance gas sensing performance, reduce energy barriers, accelerate surface reaction kinetics, and achieve better gas detection.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
M. Kamruzzaman, J. A. Zapien
Summary: ZnO nanorod arrays (NRAs) have potential applications as building blocks for nanoscale electronic, optoelectronic, and sensing applications. The density of ZnO NRAs can be controlled by a simple low-cost hydrothermal growth process. The wettability of ZnO NRAs is shown to have a large dependence on density.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Physical
Lianjun Wen, Dong Pan, Lei Liu, Shucheng Tong, Ran Zhuo, Jianhua Zhao
Summary: This study reports the growth of large-composition-range pure-phase InAs1-xSbx nanowires on Si substrates by molecular beam epitaxy. The pure-phase nanowires were obtained by controlling the antimony content, nanowire diameter, and growth direction. The antimony was uniformly distributed in the nanowires and no spontaneous core-shell structures were observed. The nanowires exhibited good conductivity with high mobilities at 7K.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
I Parkhomenko, L. Vlasukova, I Romanov, F. Komarov, A. Mudryi, N. Kovalchuk, S. Demidovich
Summary: The impact of SiOx and SiOx/SiNx/SiOx structures on the photoluminescence of silicon nitride layer was studied. It was found that the upper silicon oxide layer can enhance the photoluminescence yield and protect the underlying nitride layer from unintended oxidation.
Article
Chemistry, Multidisciplinary
Caroline Keller, Yassine Djezzar, Jingxian Wang, Saravanan Karuppiah, Gerard Lapertot, Cedric Haon, Pascale Chenevier
Summary: Silicon nanowires have great potential as anodes in lithium-ion batteries. This study demonstrates the use of low-cost tin oxide nanoparticles as a catalyst to replace expensive gold, and the control of silicon size to improve the performance of silicon nanowires.
Article
Chemistry, Multidisciplinary
Pericle Varasteanu, Antonio Radoi, Oana Tutunaru, Anton Ficai, Razvan Pascu, Mihaela Kusko, Iuliana Mihalache
Summary: The study focuses on developing self-powered photodetectors with silicon nanoholes (SiNHs) and four different metal nanowires (AgNWs, AuNWs, NiNWs, PtNWs), showing the AgNWs/SiNHs device performs the best in the blue light region and the AuNWs/SiNHs device has significantly enhanced sensitivity in the red and near-infrared spectral region.
Article
Energy & Fuels
M. Chatelain, M. Albaric, D. Pelletier, J. Veirman, E. Letty
Summary: This study improved a numerical method combining thermo-hydraulic simulations and a kinetic thermal donor (TD) formation model. By investigating different Cz growth processes, a more appropriate TD formation model was identified and its reliability was validated, providing insights for process optimization and furnace design to reduce TD concentrations.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Chemistry, Multidisciplinary
Dmitry S. Korolev, Kristina S. Matyunina, Alena A. Nikolskaya, Ruslan N. Kriukov, Alexey Nezhdanov, Alexey Belov, Alexey N. Mikhaylov, Artem A. Sushkov, Dmitry A. Pavlov, Pavel A. Yunin, Mikhail N. Drozdov, David Tetelbaum
Summary: This study proposes a new method for creating nanomaterials based on gallium oxide and investigates the influence of ion irradiation order on the chemical composition of implanted layers. The results show the separation of gallium profiles and the appearance of blue photoluminescence associated with Ga2O3 nanocrystals. Transmission electron microscopy confirms the formation of beta-Ga2O3 nanocrystals. The findings suggest the potential use of nanocrystalline gallium oxide in traditional CMOS technology.
Article
Materials Science, Multidisciplinary
Junheng Pan, Sheng Liu, Jau Tang
Summary: The study focuses on the ultrafast transport processes of electrons and holes excited by femtosecond laser pulses, shedding light on carrier dynamics in semiconductors. Transient optical techniques and ultrafast scanning electron microscopy are utilized to investigate carrier excitation and transport. The research also elucidates the ballistic dynamics of hot carriers near a p-n junction.
Article
Chemistry, Multidisciplinary
Tingsen Ming, Sergey Turishchev, Alexander Schleusener, Elena Parinova, Dmitry Koyuda, Olga Chuvenkova, Martin Schulz, Benjamin Dietzek, Vladimir Sivakov
Summary: This study reported efficient light-stimulated hydrogen generation from highly doped n-type silicon nanowires (SiNWs) combined with silver nanoparticles (AgNPs) in water-containing medium under white light irradiation. The SiNWs with AgNPs generated at least 2.5 times more hydrogen than those without AgNPs, and the SiNWs' sidewalls were found to be covered by silicon suboxides with stable semiconductor properties. Based on synchrotron studies, the increase in the silicon bandgap was attributed to the energetically beneficial position of the valence band in nanostructured silicon, making them promising structures for efficient hydrogen generation.
Article
Materials Science, Multidisciplinary
Smruti Medha Mishra, Suman Dey, Tukai Singha, Subhankar Mandal, Asish K. Dehury, Yatendra S. Chaudhary, Biswarup Satpati
Summary: In this study, a silicon nanowire-carbon quantum dot heterostructure photovoltaic device was developed by directly coating carbon quantum dots on chemically-etched silicon nanowire arrays. The efficiency of the solar cells was improved by using carbon quantum dots as a surface passivation and modification element for the silicon nanowires. A 1.6 times absorption enhancement was observed for the nitrogen doped carbon quantum dot decorated pyramidal silicon nanowire heterostructure compared to carbon quantum dots coated silicon nanowires on planar surfaces. The inclusion of nitrogen doped carbon quantum dots into the pyramidal silicon nanowire arrays provided enhanced absorption intensity, making them a good absorber layer in solar cells. The heterostructure also exhibited significant photoluminescence in the blue region, allowing insight into the recombination mechanism.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Green & Sustainable Science & Technology
Jung Hoon Kim, Byung Wan Jo, Jun Ho Jo, Yun Sung Lee, Do Keun Kim
Summary: The study introduces a novel method for detecting hard hat use on construction sites using modified wearable devices, which utilize sensors to automatically notify managers when workers do not wear required hard hats and monitor heart rate abnormalities.
Article
Chemistry, Physical
Hoon-Hee Ryu, Nam-Yung Park, Tae-Chong Noh, Gyeong-Cheol Kang, Filippo Maglia, Sung-Jin Kim, Chong S. Yoon, Yang-Kook Sun
Summary: By incorporating a hybrid structure design, the Li[Ni0.9Co0.045Mn0.045Al0.01] cathode achieves enhanced microstructure, leading to improved stability and cycling life of the battery.
ACS ENERGY LETTERS
(2021)
Correction
Energy & Fuels
Un-Hyuck Kim, Geon-Tae Park, Byoung-Ki Son, Gyeong Won Nam, Jun Liu, Liang-Yin Kuo, Payam Kaghazchi, Chong S. Yoon, Yang-Kook Sun
Article
Biochemistry & Molecular Biology
Ji Hoon Kim, Je-Seung Jeon, Jung Hoon Kim, Eun Ju Jung, Yun Jung Lee, En Mei Gao, Ahmed Shah Syed, Rak Ho Son, Chul Young Kim
Summary: This study used CPC and HPLC techniques to separate and identify two eudesmane type sesquiterpenes with ARE-inducing activity from the crude extract of Lindera strychnifolia roots.
Article
Chemistry, Physical
Hoon-Hee Ryu, Been Namkoong, Jae-Hyung Kim, Ilias Belharouak, Chong S. Yoon, Yang-Kook Sun
Summary: The study found that despite the high resistance to microcracking, the electrochemical performance of single-crystal NCM cathodes is inferior to polycrystalline NCM cathodes in terms of capacity and cycling stability. During cycling, the lithium concentrations in single-crystal NCM cathodes become spatially inhomogeneous, leading to the coexistence of phases with different unit cell dimensions within a single particle, which affects lithium ion diffusion and causes rapid capacity fading.
ACS ENERGY LETTERS
(2021)
Article
Multidisciplinary Sciences
H. Hohyun Sun, Un-Hyuck Kim, Jeong-Hyeon Park, Sang-Wook Park, Dong-Hwa Seo, Adam Heller, C. Buddie Mullins, Chong S. Yoon, Yang-Kook Sun
Summary: This study investigates the effect of transition metal dopants on the properties of Ni-rich cathode active materials and finds that dopants with high oxidation states significantly improve the cycling stability and performance of Li-ion batteries. Physicochemical measurements reveal substantial differences in grain geometries and crystal lattice structures of various cathode materials, which correlate with the oxidation states of their dopants.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Nam-Yung Park, Hoon-Hee Ryu, Liang-Yin Kuo, Payam Kaghazchi, Chong S. Yoon, Yang-Kook Sun
Summary: By doping Sb into the CSG cathode, the cycling stability can be significantly improved, and the microstructure can be tailored to achieve a longer battery life. This approach can enhance the performance of Ni-rich cathodes in electric vehicles and reduce costs.
ACS ENERGY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Ye Sung Kim, Ju Hwan Kim, Yang-Kook Sun, Chong S. Yoon
Summary: This study introduces boron into the cathode of Li-[Ni0.95Co0.04Al0.01]O-2 (NCA95) to create a radially oriented microstructure with a strong crystallographic texture. The results show that the microstructure of the cathode has a significant impact on its cycling stability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Gi-Mun Han, Ye-Sung Kim, Hoon-Hee Ryu, Yang-Kook Sun, Chong S. Yoon
Summary: Single-crystalline NCM cathodes are effective in countering interparticle cracking, but high nickel content SC cathodes may experience internal strain and microscopic cracking during the charging process.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Physical
Un-Hyuck Kim, Soo-Been Lee, Nam-Yung Park, Suk Jun Kim, Chong Seung Yoon, Yang-Kook Sun
Summary: The expanding electric vehicle market has driven the demand for high-energy-density batteries. However, the operation of Ni-rich cathodes under extreme-fast-charging conditions compromises their structural integrity. This study introduces a high-energy-density cathode material with added Nb, which improves its microstructure and enables stable performance under fast-charging conditions.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Physical
Hoon-Hee Ryu, Soo-Been Lee, Chong S. Yoon, Yang-Kook Sun
Summary: Polycrystalline cathodes exhibit better rate capability and cycling stability compared to single-crystal cathodes. Furthermore, the refined polycrystalline cathode shows improved performance due to the elongated, radially oriented primary particles that suppress intergranular microcracking.
ACS ENERGY LETTERS
(2022)
Article
Energy & Fuels
Geon-Tae Park, Been Namkoong, Su-Bin Kim, Jun Liu, Chong S. Yoon, Yang-Kook Sun
Summary: Eliminating cobalt from nickel-rich layered cathodes is crucial for reducing material cost and promoting sustainable development of Li-ion batteries. By adding 1 mol% molybdenum, the Li(Ni0.89Mn0.1Mo0.01)O-2 cathode exhibits improved performance in terms of capacity and cycling stability, thanks to grain size refinement and enhanced cation ordering.
Article
Chemistry, Physical
Un-Hyuck Kim, Tae-Yeon Yu, Jin Wook Lee, Han Uk Lee, Ilias Belharouak, Chong Seung Yoon, Yang-Kook Sun
Summary: Electric vehicles powered by Li-ion batteries can be dangerous due to the flammable liquid electrolytes, but all-solid-state batteries offer a safe alternative. This study demonstrates that B-doping and coating of a Ni-rich Li[Ni0.9Co0.05Mn0.05]-O2 cathode can enhance the microstructure and cathode-solid electrolyte interface, resulting in an all-solid-state battery that cycles stably for 300 cycles with minimal capacity fading. The B-doped, B-coated Li[Ni0.9Co0.05Mn0.05]O2 cathode achieves a discharge capacity of 214 mAh g-1, one of the highest among all-solid-state batteries, and retains 91% of its initial capacity after 300 cycles, surpassing previously reported all-solid-state batteries in terms of energy density without compromising cycling stability.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Hun Kim, Su-Hyun Lee, Jae-Min Kim, Chong Seung Yoon, Yang-Kook Sun
Summary: In this study, a carbonate-electrolyte-based Li-metal battery with high areal capacity and long cycle life is proposed. The cycling stability is improved by applying external compressive pressure and a boehmite-coated separator, resulting in 82% retention of initial capacity after 500 cycles. This research provides important insights for realizing high-energy-density Li-metal batteries and demonstrates the potential of employing cell compression to increase battery life and energy density.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Hun Kim, Ha-Neul Choi, Jang-Yeon Hwang, Chong Seung Yoon, Yang-Kook Sun
Summary: An inorganic Li-ion-conducting species is incorporated between sulfur (S-8) and the sulfide solid electrolyte (SSE) to enhance the ionic contact, improving the performance of all-solid-state lithium-sulfur batteries (ASSLSBs). The addition of a weakly polar solvent promotes interfacial chemical reactions, enhancing the wettability of the solid electrolyte towards the active material. This results in a high-performance ASSLSB with high areal capacity and promising lifetime.
ACS ENERGY LETTERS
(2023)
