Article
Chemistry, Multidisciplinary
Xianghe Meng, Jinlong Shi, Mengran Sun, Jiyong Yao
Summary: A new mixed-anion chalcohalide KBa2SnSe4Cl was synthesized through a high-temperature solid state method, and the introduction of KCl resulted in a significant increase in band gap. The theoretical analysis explained the reason for this increase and provided the birefringence value of KBa2SnSe4Cl. This study enriches the database of chalcogenides and offers a new approach for regulating the band gap of crystals.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Physics, Multidisciplinary
M. Denk, E. Speiser, J. Plaickner, S. Chandola, S. Sanna, P. Zeppenfeld, N. Esser
Summary: This study reports the first evidence of Raman scattering from surface phonons of a pristine metal surface, and reveals a Raman-active surface vibrational resonance on Cu(110) with a surprisingly large scattering efficiency.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Yuchen Yang, Feihai Yu, Xiao Hou, Haitao Li, Yin Zhang, Lu Mao, Baohua Duan, Qisheng Feng, Xionggang Lu, Guangyao Chen, Chonghe Li
Summary: A new perovskite compound Ba(Y0.25Zr0.5Nb0.25)O-3 with three B-site elements was successfully synthesized and studied for its structural properties, showing lattice constants consistent with prediction models, which is important for addressing lattice mismatch in large lattice constant perovskite thin films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Radhika Chauhan, B. D. Indu
Summary: The expression for the electron-phonon coupling coefficient (g(k)) is obtained by solving a six order polynomial equation derived from the quantum dynamical many-body theory of the electron and phonon Green's function for high-temperature superconductors (HTS). The analysis using the YBa2Cu3O7-delta cuprate superconductor shows a decrease in g(k) with increasing temperature above 0 K, indicating anisotropy of electron-phonon coupling in HTSs. Furthermore, the derived expression for g(k) is used to evaluate the superconducting gap, showing agreement with the T-c value for YBa2Cu3O7-delta and the reduced gap ratio of HTSs.
Article
Chemistry, Applied
Mengshi Wang, Yuanheng Wang, Renjian Hu, Ruoxin Li, Zhigang Shuai, Yen Wei
Summary: The current research on mechanochromic molecules lacks design ideas, focusing mainly on different molecular skeletons and functional groups. In this study, a group of cyano-modified TPE derivatives with different substitution sites were synthesized, and the meta-substituted mCN showed inert mechanochromic property, while the ortho- or para-substituted isomers exhibited emission wavelength shift. Through experimental data and theoretical calculations, the influence of substitution sites on mechanochromic property was clarified, and the application of the TPECN series in erasable printing and coding was explored.
Article
Engineering, Electrical & Electronic
Fan Li, Xiao Zhang, Tianxin Wu, Jiheng Li, Xuexu Gao, Jie Zhu
Summary: In this study, large magnetoelectric coupling coefficient and magnetoelectric coupling anisotropy were reported in Galfenol/PZT/Galfenol 2-2 symmetric magnetoelectric sandwich devices. The Galfenol alloy with <001> orientation exhibited significant magneto-striction and a high piezomagnetic coefficient. A magnetoelectric coupling laminate of Galfenol/PZT/Galfenol was prepared, and the device showed linear and sensitive magnetoelectric output voltage in response to AC excitation magnetic field. The device also demonstrated in-plane magnetoelectric anisotropy and potential for magnetic field sensing and energy harvesting applications when powering LEDs and a temperature/humidity sensor.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Physical
Mengmeng Song, Zihao Jiao, Wenhao Jing, Ya Liu, Liejin Guo
Summary: This study explores the benefits of high-index facets of Cu catalysts in producing C2+ products, identifying two types of sites that facilitate C-C coupling. It is found that the Cu(911) facet has the lowest energy barrier for C-C coupling, and the stabilization of CO-CO structure is promoted by less charged sites on the surface. The high selectivity for C2+ products on a Cu surface is likely attributed to the contribution of high-index facets.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Zeqing Hu, Huihong Xu, Chen Yan, Yu Liu, Qinghua Han, Longjiu Cheng, Zhou Li, Jiming Song
Summary: Cu-IV-Se compounds, including Cu-Sb-Se, Cu-Sn-Se, and Cu-Ge-Se, have been studied in the thermoelectric field. This study focused on improving the thermoelectric properties of Cu2GeSe3 through S doping and Ag alloying. The introduction of dislocations effectively reduced the lattice thermal conductivity. The optimized Cu1.85Ag0.15GeSe2.96S0.04 sample achieved a record high ZT value of 0.9 at 723 K, significantly higher compared to pristine Cu2GeSe3.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Zeqing Hu, Huihong Xu, Chen Yan, Yu Liu, Qinghua Han, Longjiu Cheng, Zhou Li, Jiming Song
Summary: Ternary Cu-based Cu-IV-Se compounds have attracted extensive attention in the thermoelectric field. By doping with S and alloying Ag, the thermoelectric performance of Cu-Ge-Se compounds was significantly improved, leading to the achievement of a high ZT value for the Cu1.85Ag0.15GeSe2.96S0.04 sample.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Yuchen Yang, Haitao Li, Baohua Duan, Qisheng Feng, Cuixia Li, Xionggang Lu, Guangyao Chen, Chonghe Li
Summary: A novel high-entropy perovskite oxide (HEPO) (Ca1/3Sr1/3Ba1/3)(Y1/4Zr1/2Nb1/4)O3 (CSBYZN) was successfully designed and synthesized. CSBYZN has a higher configuration entropy compared to other HEPOs due to the substitution of cations at both the A and B sites. The crystal structure of CSBYZN was identified as cubic with a Pm-3m space group. The lattice constant of CSBYZN was similar to the value predicted by an empirical formula, proving the predictability of lattice constants for HEPOs. This study provides new insights for the design of novel HEPOs.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Condensed Matter
Abhishek Kumar, Rakesh Kumar Singh, Harendra Kumar Satyapal, Monalisa, Amit Kumar, Saurabh Sharma
Summary: M-type Strontium Hexaferrite nanomaterials were successfully prepared using the citrate precursor sol-gel method, showing hexagonal crystal symmetry. The structural and magnetic properties of the materials were enriched with induced lattice strains, which were explored with different annealing temperatures. Magnetic parameters were refined after annealing, with noticeable improvements in Magnetization, Retentivity, Coercivity, and Curie temperature.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Applied
Zhao Chen, Yao Song, Zhenyu Zhang, Yafeng Cai, Huan Liu, Wenxiang Xie, Dehui Deng
Summary: This study reports the use of mechanical polishing to create abundant nanocavities on Cu electrode surface, which effectively confines the carbonaceous intermediates and enhances the probability of C-C coupling reaction in CO2RR. The prepared electrode exhibits a high Faradaic efficiency for C2+ products at negative potentials.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Shekhar Tyagi, V. G. Sathe, Gaurav Sharma, Rajeev Rawat
Summary: In this study, epitaxial thin films of SrRuO3 with large strain disorder were grown using pulsed laser deposition on LSAT and SrTiO3 substrates. Magnetic force microscopy was used to visualize the evolution of magnetic domains across the two transitions in these films. The results showed that the magnetic anisotropy in the films was different for the two transitions, with perpendicular magnetic anisotropy dominating. Raman spectroscopy revealed a strong influence of magnetic order on the lattice, indicating a strong spin-phonon coupling.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Shiwei Hua, Yihui Yin, Hao Liang, Yuanzhang Zhang, Yabin Yan
Summary: In this study, a theoretical framework for describing the distortion of substitutional solid solutions (SSSs) is proposed and validated. The framework can be used to predict lattice constants, track atomic equilibrium positions, and estimate the resistance to distortion.
MATERIALS & DESIGN
(2022)
Article
Multidisciplinary Sciences
Yilong Zhao, Yunxuan Ding, Wenlong Li, Chang Liu, Yingzheng Li, Ziqi Zhao, Yu Shan, Fei Li, Licheng Sun, Fusheng Li
Summary: Electrocatalytic urea synthesis is a promising alternative to traditional energy-intensive urea synthesis. By stabilizing intermediates of *NO2 and *CO, a CuWO4 catalyst achieves efficient co-reduction of CO2 and NO3- to urea via C-N coupling.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Hieu Minh Ngo, Amol Uttam Pawar, Jun Tang, Zhongbiao Zhuo, Don Keun Lee, Kang Min Ok, Young Soo Kang
Summary: Uniform-size rutile TiO2 microrods were synthesized using a simple molten-salt method with sodium chloride as a reacting medium and sodium phosphate salts as growth control additives. The synthesized microrods exhibited various photoluminescence peaks due to the presence of oxygen vacancy inside the rods and the formation of self-trapped holes near the (110) surface.
Article
Chemistry, Physical
Long Yang, Hieu Minh Ngo, Yan Luo, Amol U. Pawar, Ramesh Poonchi Sivasankaran, Kangmin Ok, Young Soo Kang
Summary: Organocatalyzed atom transfer radical polymerization (O-ATRP) with light as photoredox catalysis is an emerging field of photocatalysis and chemical transformations. This study investigated the key role of N-unsubstituted diketopyrrolopyrrole (DPP) analogues in charge transfer, singlet/triplet formation, and intermediate formation, providing insights into the structure-properties relationship and catalytic mechanism. The findings contribute to the rational search for metal-free photocatalysts for controlled radical polymerization and other organic transformations.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Hieu Minh Ngo, Umapada Pal, Kang Min Ok, Young Soo Kang
Summary: To enhance the CO2 uptake capacity, researchers introduced metal atoms into the polytriazine network and investigated the CO2 adsorption mechanism of NPT. By optimizing the framework geometry and studying the various interaction sites, they found that the CO2 adsorption capacity of NPT can be greatly enhanced by doping transition-metal atoms.
Article
Chemistry, Multidisciplinary
Hieu Minh Ngo, Gyutae Lee, Syed Kamran Haider, Umapada Pal, Thomi Hawari, Kyung Min Kim, Jongryoul Kim, Hae-Woong Kwon, Young Soo Kang
Summary: Exchange coupled Nd2Fe14B/Fe-Co magnetic nanocomposites were fabricated by incorporating CoFe2O4 nanoparticles into a Nd-Fe-B oxide matrix, resulting in optimal properties when using 7.7 mol% of soft-phase.
