Article
Materials Science, Multidisciplinary
Pengpeng Li, Bing Wang, Wei Li, Cong Qin, Lian Sun, Nan Wu, Yingde Wang
Summary: CeO2 nanoparticles annealed in different oxygen concentration atmospheres showed enhanced CO gas sensing performance, attributed to the exposed low index crystal planes and abundant oxygen vacancies.
Article
Chemistry, Multidisciplinary
Xu Zhang, Min Cai, Naxin Cui, Guifa Chen, Guoyan Zou, Li Zhou
Summary: The black TiO2 samples annealed under vacuum conditions exhibited superior photocatalytic activity, higher photo-induced charge separation efficiency, and lower recombination rates due to the more favorable formation of oxygen vacancies. The addition of urea was found to inhibit the formation of oxygen vacancies. Hydroxyl radicals were identified as the dominant oxidative species in the samples annealed under vacuum.
Article
Physics, Applied
Keliang Xu, Peng Li, Shengyu Wang, Jiangang Ma, Haiyang Xu, Yichun Liu
Summary: This study demonstrates the successful repair of oxygen vacancies through low-temperature annealing in an NF3 atmosphere. The repaired AZO nanoparticles show higher visible light reflectance and better electrical conductivity stability. This work provides insights into the passivation mechanism of oxygen vacancies in metal oxide semiconductors.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Condensed Matter
Peng Gu, Yan Zhou
Summary: This study investigated the effects of annealing atmospheres on the phase structure, microstructure, and dielectric properties of 0.68 Pb(Mg1/3Nb2/3)O3-0.32PbTiO3 ceramics. The results showed that annealing in O2 atmosphere resulted in a pure perovskite structure and higher density, while annealing in N2 or air condition led to the appearance of a second pyrochlore phase and porosity. Additionally, the dielectric properties of the ceramics were found to be highly sensitive to the annealing atmosphere.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Ceramics
Yuanhang Feng, Zhao Zhao, Ting Wang, Jiaming Li, Ming Xu, Hailiang Jiao, Chen Wang, Haibo Li, Ming Feng
Summary: This study develops a ferroelectric Bi2WO6 photocatalyst with surface oxygen defects, which can efficiently fix nitrogen to produce ammonia under mild conditions. The experiment shows that oxygen defects can provide more reactive sites for N2 adsorption, and the photogenerated charge carriers can be efficiently separated due to the internal electric field. The Bi2WO6 with oxygen defects exhibits higher NH3 yield compared to the original Bi2WO6, especially when assisted by an external magnetic field.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Renfen Zeng, Fen Ye, Xiangping Jiang, Chao Chen, Xiaokun Huang, Xin Nie
Summary: The microstructure and properties of Ce-doped BTTW-BITT ceramics were analyzed, and it was found that an appropriate amount of Ce ion doping could improve the performance, enhance the piezoelectric activity, and improve the thermal stability.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Yeongseok Jeong, Venkateswarlu Gaddam, Youngin Goh, Hunbeom Shin, Sangho Lee, Giuk Kim, Sanghun Jeon
Summary: Hafnia-based ferroelectric materials have recently gained significant attention for future electronic devices. This study reports a high imprinting effect in bilayer stack capacitors by using an optimal TaO insertion layer and high-pressure annealing. The source of the imprint field was found to be tantalum suboxides with doubly positively charged oxygen vacancies. These findings provide a new strategy to enhance the functionality of hafnia-based ferroelectric devices in the future.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Materials Science, Coatings & Films
Dun-Bao Ruan, Kuei-Shu Chang-Liao, Chia-Chien Liu, Yu-Hsuan Chien, Yao-Jen Lee
Summary: The effects of pre- and post-microwave annealing on p-type Ge metal-oxide-semiconductor devices were investigated, revealing that double-MWA treatment can significantly improve device performance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Physics, Applied
Mingji Su, Jirong Liu, Zeping Weng, Xiang Ding, Zhengyang Chen, Yi Zhang, Liang Zhao, Choonghyun Lee, Yi Zhao
Summary: A new oxygen scavenging technique based on thermodynamic considerations of metal and oxygen systems was proposed to stabilize the ferroelectric phase and enhance ferroelectricity in Hf-based oxides. The systematic investigation revealed the importance of controlling oxygen vacancies during the crystallization process for stabilizing ferroelectric properties. This oxygen scavenging technique proves to be an effective method for improving the performance of Hf-based ferroelectric materials without the need for dopants in Hf-based oxides.
APPLIED PHYSICS EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
Soo-Young Moon, Seung-Woo Jung, Hee-Jae Lee, Dong-Wook Byun, Myeong-Cheol Shin, Michael A. Schweitz, Sang-Mo Koo
Summary: The surface morphology and crystallinity of aluminum gallium oxide films were investigated, and it was found that the atmosphere during annealing affected the film properties.
Article
Nanoscience & Nanotechnology
Lin Liu, Lin Lei, Xiaomei Lu, Yinsong Xia, Zijing Wu, Fengzhen Huang
Summary: In this study, ferroelectric BaTiO3 (BTO) films were deposited on low-resistance Si(100) substrates, forming Pt/BTO/p-Si/Pt samples. Negative capacitance (NC) values were directly measured at low frequencies with a DC bias, and the tunability of NC was observed due to the asymmetric interface. The analysis showed that, in addition to the displacement current related to electric polarization, there were also relaxation currents caused by interface charge injection and oxygen vacancy migration. This research provides a new perspective for the study of miniaturized and low-energy devices utilizing NC, and has great significance for the development of silicon-based ferroelectric devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Meiwen Chen, Shuxian Lv, Boping Wang, Pengfei Jiang, Yuanxiang Chen, Yaxin Ding, Yuan Wang, Yuting Chen, Yan Wang
Summary: The endurance performance of the TiN/HZO/TiN capacitor was improved by incorporating a ferroelectric Hf0.5Zr0.5O2 thin film with a laminated structure. The formation of a laminated-structure interlayer in the HZO film, achieved by altering the HZO deposition ratio, contributed to the significant enhancement in endurance characteristic (from 10^6 to 10^8 cycles) and reduction in leakage current (by one order of magnitude). The reliability improvement was attributed to the inhibition of migration and nonuniform distribution of oxygen vacancies, providing a feasible strategy for enhancing HZO device reliability without additional materials or complicated processes.
Article
Materials Science, Multidisciplinary
Zhongwen Li, Hui Shen, Graham Dawson, Zhengzhong Zhang, Yanzong Wang, Feng Nan, Guang Song, Guannan Li, Yangjiang Wu, Hao Liu
Summary: In this study, the authors used vector piezoresponse force microscopy to observe spontaneous ferroelectric topological domains in ferroelectric materials and discovered their topological arrangements and reversible switching characteristics. They also found that the domain diameter changes with pulse duration in different intrinsic domain structures and confirmed the stability of these topological domain states in the atmosphere.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Xiaoying Feng, Shuyao Cao, Yiting Guo, Duo Teng, Yuhang Yang, Linqing Liao, Yiwei Liu, Jie Xu, Feng Gao
Summary: The photo-thermochromic effect of perovskite-structured PZNNT ferroelectric ceramics was discovered and investigated. The ceramics exhibited reduced reflectivity after near-UV light irradiation, which can be nondestructively recovered after thermal treatment. The kinetics of the photochromic reaction followed an exponential curve, while the thermochromic reaction showed linear thermodynamic process. Oxygen vacancy and small polarons were identified as potential photochromic centers. This work opens up new possibilities for the development of multifunctional ferroelectric ceramics.
Article
Chemistry, Physical
Shengqi Zhang, Xiaoyan Zhang, Yi Sun, Wei Zhou, Weimin Cao, Danhong Cheng
Summary: Developing low-cost semiconductor photoanodes is crucial for efficient and stable oxygen evolution reaction in photoelectrochemical water splitting. In this study, nanoparticulate titanium dioxide electrodes were prepared using spin-coating method, and the effects of annealing conditions on their performance were systematically investigated. The results showed that annealing at 450°C in argon atmosphere led to the highest photoelectrochemical performance, attributed to the introduction of oxygen vacancies and improved electron conductivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
