Article
Chemistry, Physical
Aila O. Santos, Lara D. Martins, Jose Henrique S. Mezavila, Jilder D. P. Serna, Noemi R. Checca, Andre V. H. Soares, Caio Machado Fernandes, Eduardo A. Ponzio, Julio Cesar M. Silva, Odivaldo C. Alves
Summary: In this study, the temperature dependence of the magnetic properties of ceria nanoparticles with cubic morphology was systematically investigated. Magnetization measurements and electron paramagnetic resonance (EPR) spectroscopy revealed both ferromagnetic and paramagnetic behavior in CeO2 nanoparticles. The temperature dependence of the broad line in EPR spectra indicated a magnetic transition at approximately 50 K, which was attributed to the condensation of surface oxygen and the extinction of oxygen vacancies. This result further confirmed the relationship between oxygen vacancies and ferromagnetic behavior in CeO2 nanoparticles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Meiyu Dong, Lu Zhang, Lihu Liu, Qin Xu, Huiyuan Sun
Summary: In this paper, ordered porous In2O3 films were prepared on ordered porous Al2O3 thin films by magnetron sputtering. The film exhibits large room-temperature ferromagnetism and magnetic anisotropy. In addition, the research shows that the room-temperature ferromagnetism of the ordered porous In2O3 films is mainly influenced by the oxygen vacancies.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Zulfiqar, Muhammad Zubair, Aurangzeb Khan, Tang Hua, Nasir Ilyas, Simbarashe Fashu, Amir Muhammad Afzal, Main Akif Safeen, Rajwali Khan
Summary: The study found that the quantity of oxygen vacancies significantly influences the structure and properties of co-doped ZnO nanoparticles, increasing with dopant concentration. Furthermore, there is a strong correlation between oxygen vacancies and the enhanced dielectric and magnetization responses of Co (fixed) and Mn (varied) co-doped ZnO nanoparticles, making them suitable for spintronics and optoelectronic applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Khushboo Punia, Ganesh Lal, Shiv K. Barbar, Satya Narain Dolia, Parvez Ahmad Alvi, Saurabh Dalela, Sudhish Kumar
Summary: This article discusses the cooperative magnetism induced by oxygen vacancies and defects in ZnO nanocrystals of different sizes, showing that smaller nanocrystals exhibit enhanced ferromagnetic behavior. The presence of oxygen vacancies and valence fluctuations also play a crucial role in mediating the magnetism of the ZnO nanocrystals.
Article
Materials Science, Ceramics
Jelena Vukmirovic, Sara Joksovic, Danica Piper, Andrea Nesterovic, Mirjana Novakovic, Srdan Rakic, Marija Milanovic, Vladimir V. Srdic
Summary: The structure of epitaxial LaMnO3 thin films grown on different single crystal substrates using unconventional polymer assisted deposition (PAD) method was investigated. The influence of substrate type on the film structure was analyzed by depositing lanthanum manganite water based solutions on MgO (001), SrTiO3 (001) and SrTiO3 (110) substrates through spin coating. Better uniformity of the films was observed on SrTiO3 substrates, but a non-stoichiometric phase was formed after heat treatment at 750 degrees C. The importance of post-annealing treatment was investigated by multiple annealing of the prepared films at different temperatures up to 900 degrees C, and the epitaxial nature of the films was preserved with a structure rearrangement closer to bulk stoichiometric LaMnO3 phase.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Adil Murtaza, Wen-liang Zuo, Xianghao Song, Awais Ghani, Azhar Saeed, Muhammad Yaseen, Fanghua Tian, Sen Yang
Summary: This work reports on the robust ferromagnetism at room temperature in co-precipitation derived rare-earth (Tb) and transition metal (Co) co-doped ZnO nanoparticles. XRD analysis confirms the single-phase character, while morphological studies show the formation of spherical-shaped particles separated by well-defined grain boundaries. The increase in oxygen vacancies is confirmed through photoluminescence spectra. The (Tb, Co) co-doped NPs exhibit room temperature ferromagnetic behavior, which is discussed based on the role of oxygen vacancies and grain boundaries.
Article
Chemistry, Physical
Thierry de Vrijer, Arno H. M. Smets
Summary: The oxidation and carbisation kinetics of porous amorphous and nano-crystalline hydrogenated germanium films were studied using infrared spectroscopy. A two-step process involving water oxidation and carbon dioxide carbisation was proposed. Water acted as the precursor for the oxidation of the films. Oxygen was preferentially incorporated at Ge-dangling bonds rather than at the Ge-Ge back bonds. The formation of germanium oxide at void surfaces resulted in lower energy levels for the valence band, which aligned with the water reduction reaction. The oxidation process led to local catalytic generation of electrons and protons, which acted as precursors for the carbisation reaction.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Xiaodong Zhou, Erlei Wang, Xiaodong Lao, Yongmei Wang, Honglei Yuan
Summary: This study investigated room temperature ferromagnetic Cu-doped LiNbO3 thin films and found that the activation of ferromagnetism may be attributed to indirect interactions between oxygen vacancies and dopant ions. The results contribute to elucidating the origin of ferromagnetism in perovskite ferroelectric oxides.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Ceramics
Adil Murtaza, Xianghao Song, Awais Ghani, Fazal Kabir, Azhar Saeed, Wen-Liang Zuo, Muhammad Yaseen, Kaili Li, Chao Zhou, Yin Zhang, Sen Yang
Summary: In this study, Zn0.95-xNdxTM0.05O (TM = Co, Fe) (x = 2%, 6%) nanocrystals with spherical shape and average crystallite size of 35 nm were prepared by sol-gel method, exhibiting ferromagnetic behavior. XPS results confirmed the successful incorporation of dopants ions into the ZnO lattice. The presence of grain boundaries and oxygen vacancies played a significant role in the ferromagnetic response and dielectric properties of the samples.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Adil Murtaza, Xianghao Song, Awais Ghani, Wen-liang Zuo, Fazal Kabir, Azhar Saeed, Muhammad Yaseen, Kaili Li, Sen Yang
Summary: Herein, Zn0.98-xMn0.02TbxO (x = 3%, 5%) nanocrystals with wurtzite hexagonal structure and average crystallite size of 25-27 nm were prepared by the sol-gel process. These nanocrystals exhibit ferromagnetism (FM) at room temperature and various intrinsic defects induced by Tb/Mn co-doping. The dielectric properties were measured at room temperature as a function of frequency, and the underlying origin of the observed FM and dielectric behavior was investigated.
Article
Physics, Applied
Hanqing Li, Pei Zhang, Tao Ouyang, Huiming Wang, Jin Li, Chaoyu He, Chunxiao Zhang, Chao Tang
Summary: Research on semi-hydrogenated graphene (SHG) reveals stable paramagnetic and ferromagnetic phases, with distinct phonon mode frequencies that can be used to identify different magnetic orders. The coupling effect plays a critical role in lattice thermal conductivity, with the ferromagnetic phase exhibiting almost twice the thermal conductivity of the paramagnetic phase.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Qian Li, Heng Yuan, Mengdi Zhang, Weiqing Yan, Bin Liao, Xu Zhang, Minju Ying
Summary: The annealing effect on Er-implanted ZnO films under different conditions were systematically studied, showing that vacuum annealing significantly enhances the magnetization of the films and is correlated with an increase in oxygen vacancy concentration. The research provides clear evidence of the relationship between the enhancement of ferromagnetism and the increase of oxygen vacancies in Er-doped ZnO.
Article
Chemistry, Physical
Xiaolu Chen, Ke Ye, Shunru Jin, Xiyu Li, Guozhen Zhang, Xin Li, Shenlong Jiang, Qun Zhang, Qing Zhu, Jun Jiang
Summary: This study demonstrates the potential of hydrogenated MoO3 (HMO) as an excellent cocatalyst for the ZnIn2S4 photocatalyst, significantly improving the H-2 production rate. The efficient charge transfer from ZnIn2S4 to HMO and the lowered overpotential of the H-2 evolution reaction contribute to this enhancement.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Weihao Fan, Huaiyuan Wang, Chijia Wang, Zhanjian Liu, Zihua Wang, Shupei Liu, Yanji Zhu
Summary: Oxygen vacancy modified Fe2O3 (OV-Fe2O3) nanorods were synthesized and used as fillers in epoxy coatings for passivation of steel substrates. The OV-Fe2O3 fillers stored oxygen atoms in the vacancies to achieve a metastable state. Impedance spectroscopy revealed that OV-Fe2O3 coatings exhibited a 105-fold increase in impedance modulus compared to general alpha-Fe2O3 coatings after O2-high pressure and high-temperature corrosion. X-ray photoelectron spectroscopy and scanning vibrating electrode technique confirmed that OV-Fe2O3 allowed continuous transport of oxygen from the oxygen-rich environment to the oxygen-deficient substrate surface, leading to efficient passivation.
Article
Chemistry, Physical
Preetam Singh, Vikash Mishra, Sajal Barman, Mohammad Balal, Sudipta Roy Barman, Arvind Singh, Sunil Kumar, Renjith Ramachandran, Pankaj Srivastava, Santanu Ghosh
Summary: Pure ZnO films annealed in H-2 ambience exhibit room temperature ferromagnetism, with observed enhancements in O-H concentration, carrier concentration, and vacancy type defects. The increase in magnetic moment is explained by the increased carrier mediated exchange interaction among localized magnetic moments at V-Zn sites, as verified both experimentally and theoretically.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Lai-Guo Wang, Wei Zhang, Yan Chen, Yan-Qiang Cao, Ai-Dong Li, Di Wu
NANOSCALE RESEARCH LETTERS
(2017)
Article
Multidisciplinary Sciences
Yan-Qiang Cao, Xi-Rui Zhao, Jun Chen, Wei Zhang, Min Li, Lin Zhu, Xue-Jin Zhang, Di Wu, Ai-Dong Li
SCIENTIFIC REPORTS
(2018)
Review
Materials Science, Multidisciplinary
Chang Fang, Yanqiang Cao, Di Wu, Aidong Li
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
(2018)
Article
Multidisciplinary Sciences
Min Li, Zhi-Xian Jin, Wei Zhang, Yu-Hang Bai, Yan-Qiang Cao, Wei-Ming Li, Di Wu, Ai-Dong Li
SCIENTIFIC REPORTS
(2019)
Article
Multidisciplinary Sciences
Yan-Qiang Cao, Shan-Shan Wang, Chang Liu, Di Wu, Ai-Dong Li
SCIENTIFIC REPORTS
(2019)
Article
Materials Science, Multidisciplinary
Yanqiang Cao, Shanshan Wang, Chang Liu, Aidong Li
Summary: The synergistic effect of hydroxylated multi-walled carbon nanotubes and ALD ZnS film results in excellent electrochemical performances for the composite material, suitable for use as a lithium-ion battery anode.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Yanqiang Cao, Tiancheng Lai, Furui Teng, Chang Liu, Aidong Li
Summary: A highly stretchable and sensitive strain sensor using Ag NWs/MWCNTs on hair band was proposed in this study, showing excellent sensing performance and stability for monitoring human motions and swallowing actions.
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
(2021)
Article
Physics, Condensed Matter
Rui Tan, Qi Qi, Peng Wang, Yanqiang Cao, Rongrong Si, Maoxiang Wang, Xiaoxiong Wang
Summary: In this study, the electronic structure evolution of Ge1-xSnx alloys was investigated using first-principles simulations, revealing the band reordering, topological phase transition, and topological surface mode of α-Sn.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Nanoscience & Nanotechnology
Tangjie Cheng, Zebin Zhu, Xinxin Wang, Lin Zhu, Aidong Li, Liyong Jiang, Yanqiang Cao
Summary: Metal nanogaps can confine electromagnetic field into extremely small volumes, exhibiting strong surface plasmon resonance effect. However, it is challenging to fabricate large-scale nanogaps with precise control of gap size, limiting the practical applications of metal nanogaps.
Article
Chemistry, Analytical
Xinxin Wang, Lin Zhu, Tangjie Cheng, Jisong Qian, Qing Wang, Qianqian Ding, Aidong Li, Liyong Jiang, Yanqiang Cao
Summary: This paper reported a simple strategy to obtain clean Ag dendrites by high temperature decomposition of organic impurities. Ultra-thin coating via atomic layer deposition (ALD) was used to retain the nanostructure of Ag dendrites at high temperature. SERS activity could be recovered after etching ALD coating, and organic impurities could be effectively removed. This strategy is a promising and non-destructive method to clean the SERS substrates.
Article
Chemistry, Inorganic & Nuclear
Lin Zhu, Geng-Lai Yang, Wen-Juan Ding, Yan-Qiang Cao, Wei-Ming Li, Ai-Dong Li
Summary: This study deeply explores the growth behavior of iridium (Ir) metal formed by atomic layer deposition (ALD) in high aspect ratio nanostructures. It is found that surface hydrophilicity is crucial for the nucleation of ALD Ir. The infiltration depth of ALD Ir in the nanostructures is found to be proportional to the pore diameter and the square root of the Ir precursor pulse time. Additionally, the appropriate O-2 partial pressure should be chosen for ALD Ir in high aspect ratio materials. This research is valuable for surface modification or coating of metal in high aspect ratio nanostructures.
DALTON TRANSACTIONS
(2022)
Review
Materials Science, Multidisciplinary
Yanqiang Cao, Xiangbo Meng, Aidong Li
Summary: Electrification has significant impacts on modern society, but state-of-the-art lithium-ion batteries are not sufficient for future transportation. High-capacity anodes like silicon, SnO2, and lithium metal are under investigation but face challenges such as volume changes. Strategies like atomic layer deposition (ALD) are being explored to address these issues.
ENERGY & ENVIRONMENTAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Chang Liu, Chun-Chen Zhang, Yan-Qiang Cao, Di Wu, Peng Wang, Ai-Dong Li
JOURNAL OF MATERIALS CHEMISTRY C
(2020)
Review
Electrochemistry
Qiang Ren, Yan-Qiang Cao, Daniel Arulraj, Chang Liu, Di Wu, Wei-Ming Li, Ai-Dong Li
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2020)