Article
Chemistry, Physical
Hyemin Kim, Seongmin Shin, Dae Soo Jung, Jung Hyun Kim
Summary: In this study, spherical granules composed of silicon nanoparticles grafted with nitrogen-doped carbon nanotubes (Si-NCNTs) were fabricated through spray drying and catalytic chemical vapor deposition. The Si-NCNTs exhibited improved capacity retention and rate capability compared to Si-NPs and commercial CNTs composites (Si-CNTs) prepared by spray drying alone. The Li+ ion-diffusion-coefficient (DLi+) of Si-NCNTs was approximately three times larger than Si-CNTs at critical lithiation potential. The electrically conductive buffers provided by NCNTs accommodated the volume change and facilitated Li+ ion transport.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Xiaohang Li, Xiaoxuan Yang, Liting Liu, He Zhao, Yawei Li, Haiyan Zhu, Yuanzhen Chen, Shengwu Guo, Yongning Liu, Qiang Tan, Gang Wu
Summary: A nitrogen/sulfur codoped single iron site catalyst (Fe-N/S-C) prepared through chemical vapor deposition (CVD) showed superior catalytic activity for the oxygen reduction reaction (ORR) in alkaline media. The tuning of optimal charge distribution of Fe sites by N and S codoping and the suppression of iron-carbide-containing iron clusters formation contributed to the high performance of the catalyst. Further studies demonstrated its promising performance as a cathode catalyst in direct methanol fuel cells.
Article
Materials Science, Multidisciplinary
Vishal Saravade, Zahra Manzoor, Alexis Corda, Chuanle Zhou, Ian Ferguson, Na Lu
Summary: This study investigates the optical properties and process-structure-property relationships of Mn-doped zinc oxide grown using metal-organic chemical vapor deposition with varying Mn-doping concentration and growth conditions. The results show that Mn-doping can alter the bandgap and photoluminescence characteristics of ZnMnO.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Xin Lin, Ying-Hua Yu, Guang-Hui Chen, Qiao-Hong Li, Lei Zhang, Jian Zhang
Summary: Heterometallic oxo clusters have unique properties due to the synergistic interactions between different components. In this study, copper-doped polyoxo-titanium clusters (Cu-PTCs) coordinated with different acetate derivative ligands were constructed and their catalytic applications were investigated. The number of exposed metal ions on the surface of the clusters changed due to the variations in the steric hindrance of the ligands, which also affected their catalytic activities as Lewis acids. The obtained compounds showed increasing catalytic activities from PTC-367 to PTC-370 in a carbon dioxide cycloaddition reaction conducted in an atmospheric environment.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Xianzhong Yang, Weiping Li, Jiaze Lv, Guojie Sun, Zixiong Shi, Yiwen Su, Xueyu Lian, Yanyan Shao, Aomiao Zhi, Xuezeng Tian, Xuedong Bai, Zhongfan Liu, Jingyu Sun
Summary: The research used direct plasma-enhanced chemical vapor deposition strategy to grow N-doped carbon on a commercial glass fiber separator, aiming to achieve a highly stable zinc anode and alleviate side reactions. This new separator reduces the nucleation overpotential of zinc and enhances zinc-ion transference number, leading to stable cycling and high discharge depth of the zinc anode.
Article
Chemistry, Multidisciplinary
Yan Wang, Yuanxing Fang, Yankun Wang, Haisu Wu, Masakazu Anpo, Jimmy C. Yu, Xinchen Wang
Summary: This study describes the synthesis of nitrogen-doped carbon (NDC) photocatalyst directly from ammonia and methane gases. The photocatalyst can selectively synthesize imines by photo-oxidation of amines, producing H2O2 simultaneously in the photoreduction reaction. These findings shed light on the chemical evolution of the Earth.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Guanrong Ou, Jiahao Chen, Man Lu, Jiawei Liu, Xiaoke Zhang, Xiaoming Lin, Yongbo Wu, Akif Zeb, R. Chenna Krishna Reddy, Zhiguang Xu
Summary: In this study, a N-doped carbon ZnO/Co3ZnC composite with excellent lithium storage properties was fabricated using a metal-organic framework as a sacrificial template. The introduction of N-doped carbon frameworks, oxygen vacancies, and the unique structure contributed to the remarkable lithium storage performance of the ZnO/Co3ZnC anode for LIBs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Applied
Hani Nasser Abdelhamid, Sherief A. Al Kiey, Walid Sharmoukh
Summary: Hybrid nanomaterials with dye encapsulated zeolitic imidazolate frameworks were synthesized and used as precursors for zinc oxide embedded nitrogen-doped carbon. The resulting ZnO@N-doped C exhibited high capacitance and excellent cycling stability, retaining 87.7% of the initial capacitance after 1000 galvanostatic charge-discharge cycles. The presence of a guest molecule like RhB significantly improved the capacitance of the carbonized ZIF-8 materials.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Jian Meng, Zhichao Miao, Jie Zhang, Zhao Wang, Runce Zhang, Leilei Xu, Lechen Diao, Jin Zhou, Shuping Zhuo
Summary: We synthesized a carbon nanotubes-en-capsulated Ni nanoparticles catalyst through a facile chemical vapor deposition approach for electrochemical CO2 reduction (ECR). The Ni@N-C catalyst exhibited the highest CO Faraday efficiency (FECO%) of 90% at -0.77 V vs. RHE in the H-type cell. Moreover, it showed a high FECO% of over 93% within the range of -0.37 to -0.77 V vs. RHE in the flow cell. The excellent catalytic performance of Ni@N-C suggests that N-doped carbon nanotubes coated on Ni nanoparticles play a vital role in promoting ECR activity. This work provides insights into the development of a simple and efficient electrocatalyst for ECR.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
In-Hwan Lee, Yongsheng Jin, Hyeon-Sik Jang, Dongmok Whang
Summary: In this study, N-doped nanoporous carbon was successfully developed as a stable Li metal host through the simple calcination of a nitrogen-containing metal-organic framework. The resulting N-doped porous carbon exhibited excellent electrochemical performances and is expected to provide an efficient approach for reliable Li metal anodes.
Article
Chemistry, Physical
Quang Chieu Bui, Bassem Salem, Herve Roussel, Xavier Mescot, Youssouf Guerfi, Carmen Jimenez, Vincent Consonni, Gustavo Ardila
Summary: High temperature annealing under oxygen atmosphere has significant effects on the structure and properties of ZnO thin films, leading to improvements in grain boundary velocity and piezoelectric amplitude, ultimately enhancing the piezoelectric performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Multidisciplinary
Peng-Xiang Hou, Feng Zhang, Lili Zhang, Chang Liu, Hui-Ming Cheng
Summary: The FCCVD is an important technique for synthesizing high-quality CNTs with various morphologies, offering advantages of simplicity, controllability, and scalability. Researchers review the controlled growth, properties, and applications of CNTs, discussing key challenges and prospects for the future.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Qinke Wu, Taehwan Jeong, Seong Heon Kim, Young Jae Song
Summary: This study presents a quick and simple method to grow high quality two-dimensional graphitic carbon nitride nanosheets with a large domain size on copper foils. The research demonstrates that graphitic carbon nitride prefers a Cu(111) surface for growth and highlights the importance of using a carrier gas, with noble Ar gas recommended for its weaker etching effect compared to hydrogen gas. Furthermore, high-quality graphitic carbon nitride films grown by CVD can be easily transferred onto other substrates for various applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Eric Navarrete, Frank Guell, Paulina R. Martinez-Alanis, Eduard Llobet
Summary: Different thicknesses of Au films were used in the growth of ZnO nanowires, with the 6 nm thick layers showing the most stable and repeatable gas sensing properties. Despite ZnO nanowires grown using the thickest Au layers reaching the highest responses under dry conditions, those grown using the thinnest Au film were more resilient at detecting NO2 in the presence of ambient moisture. The gas sensing results were discussed in light of defects and Au impurities in the ZnO nanowires, as revealed by characterization techniques such as X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Armando Hernandez, Md Minhazul Islam, Pooneh Saddatkia, Charles Codding, Prabin Dulal, Sahil Agarwal, Adam Janover, Steven Novak, Mengbing Huang, Tuoc Dang, Mike Snure, F. A. Selim
Summary: Epitaxial Ga2O3 films were grown through MOCVD with optimized growth and doping parameters, showing that electron density and conductivity are influenced by the interplay between dopant concentration, C concentration, and trapping defects in the films. Conductive films with desirable resistivity and mobility for FET and transparent FET applications in DUV technology were successfully obtained.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Physical
Xiangwei Qu, Jingrui Ma, Pai Liu, Kai Wang, Xiao Wei Sun
Summary: This work investigates the voltage sweep behavior of quantum dot light-emitting diodes (QLEDs). It is found that red QLEDs with ZnMgO electron transport layer (ETL) experience a drop in efficiency under consecutive voltage sweeps, while devices with ZnO ETL show an increase in efficiency. The analysis reveals that the efficiency drop in ZnMgO devices is related to hole leakage mediated by trap states on ZnMgO nanoparticles. Furthermore, the hole leakage also causes rapid lifetime degradation of ZnMgO devices.
Article
Chemistry, Physical
Qingqian Wang, Hongmei Zhu, Wei Chen, Junjie Hao, Zhaojin Wang, Jun Tang, Yingguo Yang, Xiao Wei Sun, Dan Wu, Kai Wang
Summary: This study proposes an effective strategy to achieve high CPL activity in quantum dots by introducing 2D chiral perovskite as a chiral source, providing spin polarized carriers through the CISS effect. The as-synthesized QDs/CP composites exhibit dissymmetry factors (g(lum)) up to 9.06 x 10(-3). These findings provide a useful method to achieve CPL in QDs/2D chiral perovskite heterojunctions, which could be promising in spin-optoelectronics application.
Article
Chemistry, Multidisciplinary
Hui Zhang, Xiaohu Mi, Bowen Kang, Yunkai Wu, Tingting Zhang, Pai Liu, Xiaowei Sun, Zhenglong Zhang, Ning Liu, Hongxing Xu
Summary: Colloidal nanocrystals play a significant role in optoelectronic devices and their properties can be improved through ligand modification, which can enhance charge transport and emission characteristics in LEDs.
Article
Biochemistry & Molecular Biology
Yunwu Yu, Chunyang Xie, Yan Wu, Peng Liu, Ye Wan, Xiaowei Sun, Lihua Wang, Yinan Zhang
Summary: A novel composite membrane was developed by casting chitosan and polyvinyl alcohol on a glass fiber microporous membrane. The addition of chitosan improved the CO2 permeance and selectivity due to the favorable CO2 affinity of the polymer coating. Chemical structure analysis showed no change after heat treatment, while SEM images revealed a dense surface of the composite membranes. The CO2 permeance and selectivity were further enhanced after wetting and heat treatment.
Article
Nanoscience & Nanotechnology
Lixuan Chen, Jinyang Zhao, Zhiqing Shi, Miao Zhou, Shengdong Zhang, Xiao Wei Sun, Xin Zhang
Summary: Semiconductor quantum rods (QRs) emit polarized light and have great potential for energy-efficient and color-enhancing modern display devices. We present the stretching of an aligned QR polarized film to improve brightness and optical efficiency in quantum-dot based displays. The study of QR material, stretching ratio, and alignment degree guides the fabrication of highly polarized QR film. A large-area film with an alignment degree of 0.635 achieved more than 1.6-fold enhancement in brightness and transmittance compared to traditional structures, making it a viable option for various energy-saving display devices.
Article
Nanoscience & Nanotechnology
Hongmei Zhu, Qingqian Wang, Kun Sun, Wei Chen, Jun Tang, Junjie Hao, Zhaojin Wang, Jiayun Sun, Wallace C. H. Choy, Peter Muller-Buschbaum, Xiao Wei Sun, Dan Wu, Kai Wang
Summary: The chirality of 2D chiral perovskite films has been significantly enhanced by a solvent modulation strategy, leading to the formation of CPL-active materials. By creating chiral perovskite/quantum dot composites, an increase in the CPL intensity was observed, attributed to the generation and transportation of spin-polarized charge carriers as well as the enlarged lattice distortion of the chiral perovskite films achieved through solvent modulation. This approach provides an effective way to construct CPL-active materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Xiangwei Qu, Guohong Xiang, Jingrui Ma, Pai Liu, Aung Ko Ko Kyaw, Kai Wang, Xiao Wei Sun
Summary: In this work, we find that blue quantum dot light-emitting diodes (QLEDs) exhibit electron over-injection compared to hole injection using impedance spectroscopy and capacitance-voltage characteristics analysis. We also observe the spatial distribution of the exciton recombination zone in blue QLEDs using a red quantum dot as a fluorescent sensor. Our findings provide a practical method for identifying excess carrier in blue QLEDs and have implications for other types of QLEDs.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Gang-Gang Xu, Xiao-Wei Sun, Xiao-Dong Wen, Xi-Xuan Liu, Ting Song, Zi-Jiang Liu
Summary: This study uses a pair of triangular prisms to construct hexagonal-lattice phononic crystal plates that mimic the dual-band elastic valley Hall effect. Based on spatial inversion symmetry conditions, the relationship between the resonance frequencies of the resonators and the valley degeneracies, topological nontrivial bandgaps, and energy band inversion characteristics of multiple resonance modes is investigated. Edge passbands with distinct topology phases exist in each of the two nontrivial bandgaps of the ribbon configuration. This work provides a reference for valley edge protection in subwavelength continuous elastic plate media and for the manipulation of elastic waves at multiple frequencies.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Ning Li, Jun-Hong Tian, Ting Song, Lie-Juan Li, Zi-Jiang Liu, Xiao-Wei Sun
Summary: The effects of In, Sn, and Sb alloying in PbH4 on the superconductivity at high pressure were investigated using first-principles calculations. The alloying structures exhibited thermodynamical, mechanical, and dynamic stability, as indicated by the calculated formation enthalpy, elastic constants, and phonon dispersion. The superconductivity of Pb2MH12 (M = In, Sn, and Sb) was improved by the addition of M. The superconducting transition temperature increased from 62 K for PbH4 to 70, 69, and 66 K for Pb2MH12 (M = In, Sn, and Sb), respectively. Electronic structure and electron-phonon coupling calculations showed an increase in the contribution of H atoms to the density of states at the Fermi energy and enhancement of the strength of electron-phonon coupling. The results suggest that alloying lighter elements with lower electronegativity is an effective method to improve superconducting properties.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Ronghuan Liu, Bihua Hu, Kai Wang, Baomin Xu, Xiao Wei Sun
Summary: Compared with polycrystalline thin films, perovskite single crystals without grain boundaries have better photovoltaic performance and stability. A green and low-cost airflow-assisted growth method has been developed for the synthesis of large quantities of high-quality and dispersed CsPbBr3 single-crystal wires under ambient conditions. This method shows great potential for optoelectronic applications and may facilitate the research of all-inorganic perovskite single crystals.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Optics
Jianxu Lan, Xiaodong Wen, Xiaowei Sun, Xixuan Liu, Yiwen Wang, Genliang Han
Summary: The study proposes a high-optomechanical-coupling-rate heterostructure with a gradient cavity, and calculates the optomechanical rates of the single mirror and hetero-optomechanical crystal nanobeam resonators. The results show that the heterostructure based on the utilization of two mirror regions achieves better confinement of the optical and mechanical modes. Additionally, it demonstrates a mechanical breathing mode at 9.75 GHz and an optical mode with a working wavelength of 1.17 μm, with an optomechanical coupling rate g(0) = 3.81 MHz between them, and an increased mechanical quality factor of 3.18 x 10(6).
Article
Physics, Applied
Guohong Xiang, Jingrui Ma, Xiangwei Qu, Kai Wang, Hoi Sing Kwok, Xiao Wei Sun
Summary: We present transparent quantum dot light-emitting diodes (QLEDs) with a current focusing structure. By depositing a SiO2 thin film to create the current focusing structure, we achieved significantly increased DC density and luminance, reaching values of over 8700 mA/cm(2) and 360,000 cd/m(2) respectively. The impact of SiO2 thickness and aperture width on emission spectra and current densities was investigated. The current focusing design demonstrates its effectiveness and potential application in other planar LED devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Guanding Mei, Xiangtian Xiao, Sajjad Ahmad, Hong Lin, Yangzhi Tan, Kai Wang, Xiao Wei Sun, Wallace C. H. Choy
Summary: This study demonstrates the importance of microcavity design for improving the light extraction efficiency of Perovskite light-emitting diodes (PeLEDs). The experiment shows that a high-efficiency horizontal dipole in the microcavity is the key to improving the efficiency.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Applied
Wei He, Mingyuan Huang, Xiaowei Sun
Summary: This paper presents a numerical analysis of the topological valley kink states in a two-dimensional photonic crystal, focusing on both zigzag and armchair domain walls. By manipulating the triangular holes in a honeycomb structure, inequivalent valleys were created in the momentum space. The results showed that both the zigzag and armchair interfaces can support topologically protected valley kink states, providing potential applications for valley waveguides in integrated photonics.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Phil Surman, Changxiong Zheng, Chaojian Zhang, Zhenwei Yao, Xiaochuan Yang, Wenwei Xu, Xiao Wei Sun
Summary: The availability of high-resolution display panels has made glasses-free 3D displays a viable mainstream commercial product. This paper discusses the measurement of multiview 3D displays that use a slanted lenticular screen to control light directions. Understanding the image depth of field is important, in addition to the usual parameters. The aim of the paper is to describe general theory and procedure, and not the measurement of specific displays.