JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 1
·285-292
·
IF 4.186
Mengjiao Chi,Yahan Liu,Jianwei Zhao,Chao Dong,Xinjiang Luo,Dawei Wang,Bing Liu,Minmin Mao,Feng Shi,Kaixin Song
It is difficult to get pure-phase Mg 3 B 2 O 6 (abbreviated as MBO) ceramics by the traditional high-temperature solid-state reaction method. In this paper, pure-phase MBO ceramics were successfully densified and obtained by combining the cold sintering and post-annealing process. The relative density of MBO ceramics was ∼80% cold sintered at 150°C/90 min/800 MPa, which was further improved to ∼91% by post-annealing at 900°C, 400°C lower than that of the traditional high-temperature sintering process (∼1300°C). X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and Raman results demonstrated that the secondary phase of MgO was effectively eliminated, and dense microstructure was observed by the cold-sintering process plus post-annealing treatment. Finally, the microwave dielectric properties of MBO were evaluated with ε r : 5.15–6.37, Q×f : 5942–16 686 GHz, τ f : −48.45–69.72 ppm/°C.
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 1
·461-468
·
IF 3.784
Baoyu Deng,Yiming Ma,Tianxiang Chen,Huajing Wang,Jinfeng Lin,Cong Lin,Xiao Wu,Chunlin Zhao,Tengfei Lin,Min Gao,Xinghua Zheng,Changqing Fang
Dense (K, Na)NbO 3 ceramics are successfully fabricated via the cold sintering process at 350°C under a uniaxial pressure of 400 MPa for 4 h. Equimolar KOH and NaOH solutions were utilized as a transient alkaline flux. The microstructure and dielectric properties were studied in detail. Scanning electron microscope and the relative densities reveal dense structures of the ceramics. After post-annealing at 800°C for 1 h, the ceramics show good electrical performance. The relative dielectric permittivity is 829 (at 10 kHz) at room temperature, and the piezoelectric constant ( d 33 ) reaches up to 148 pC/N. The cold sintering technique with equimolar KOH and NaOH solutions as a transient alkaline flux endow KNN ceramics with excellent dielectric and piezoelectric properties, showing a potential way to fabricating other KNN-based ceramics at low temperature.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2017
·Vol. 121
·期 2
·
IF 2.068
You Y.,Wang C.,Xu Y. L.,Wan J. X.,Ren W.,Fang X. H.,Chen X. Y.
Boron-doped graphene (B-doped graphene) films with large area, high quality, and good uniformity are successfully prepared by chemical vapor deposition using ethylboronic acid (C 2 H 7 BO 2 ) as the sole precursor. The pre-treatment of the copper foil and post-annealing are introduced to the growth process and proved to be greatly influential to the quality of B-doped graphene. The films prepared are mainly monolayer with the transmittance of about 97.1%, the B/C ratio of about 2.3%, the sheet resistance of 1.5–3 kΩ/◻, and the carrier density of 1.13 × 10 13 cm −2 at room temperature.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 23
·21154-21167
·
IF 2.22
Yuan Beilei,Li Ning,Liu Jialiang,Xu Fan,Li Chen,Juan Fangying,Yu Huanqin,Li Cuncheng,Cao Bingqiang
Inorganic perovskite cesium lead bromide (CsPbBr 3 ) gets extensive attention due to its superb stability and moisture-tolerance feature. Here, solution-processed CsPbBr 3 perovskite films and their based solar cells were fabricated in ambient condition. The effect of post-annealing on the properties of the CsPbBr 3 film grown and the photoelectric performance of perovskite solar cells (PSCs) have been systematically investigated, which enhances the device power conversion efficiency (PCE) from 2.67 to 5.20%. Moreover, by doping mesoporous TiO 2 (m-TiO 2 ) with reduced graphene oxide (RGO), the PCE of solar cells attained an apparent enhancement and finally improved to 7.08%. Not only high-quality CsPbBr 3 perovskite films but also high-performance mesoporous PSCs were obtained by film post-annealing and electron transport layer (ETL) doping, which were all fabricated in ambient conditions.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Chunhai Jiang,Zhimin Zou
Sheet-like lithium-rich cathode materials Li 1.2 Mn 0.54 Ni 0.16 Co 0.10 O 2 (LMNCO) assembled by primary grains of 100–500 nm in sizes were facilely prepared by a glucose-urea bubbling and post-annealing process. The post-annealing temperature was found to play an important role on the grain size , crystallinity , cation ordering and electrochemical performance of the cathode materials. The sample post-annealed at 900 °C showed larger grains, higher crystallinity, better layered structure, higher lithium storage capacity and better rate performance than the one annealed at 800 °C. An initial discharge capacity of above 300 mA h g −1 was obtained at 0.1 C (20 mA g −1 ) for the sample annealed at 900 °C, and at 1, 2, 5 and 10 C, discharge papacies of 223, 192, 157 and 128 mA h g −1 were achieved respectively. The material synthesizing process proposed in this study may be extended to prepare a wide range of sheet-like functional oxides that may be potentially applied in energy storage or other fields.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 2
·724-731
·
IF 2.936
Jun Luo,Ren Zheng Qiu,Zhi Sheng Yang,Yan Xiang Wang,Qi Feng Zhang
In this paper, γ-butyrolactone (GBL) solvent vapor post-annealing (SVPA) on CH3NH3PbI3 thin films is reported, aiming to improve the complete transformation of PbI2 and increase the grain size of the CH3NH3PbI3 crystal, thus boosting the performance of mesoporous CH3NH3PbI3 perovskite solar cells (PSCs). The influence of GBL SVPA on the microstructure of perovskite layers and performance of PSCs was studied. The short circuit current density (Jsc) of the devices significantly increased, yielding a high efficiency of 16.58%, which was 27.05% higher than that of thermally annealed films. A model was derived to explain the effect of GBL SVPA on PSCs. The perovskite films prepared by this method present several advantages such as complete transformation of PbI2 to CH3NH3PbI3, high crystallinity, large grain size, and fewer grain boundaries than those prepared without GBL SVPA. This improvement is beneficial for charge dissociation and transport in hybrid photovoltaic devices.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 36
·21872-21885
·
IF 3.945
Zhiwei Gong,Wei Xu,N. A. Liedienov,D. S. Butenko,I. V. Zatovsky,I. A. Gural'skiy,Ziyu Wei,Quanjun Li,Bingbing Liu,Yu. A. Batman,A. V. Pashchenko,G. G. Levchenko
Prospects for the use of manganites in various areas of modern technologies require comprehensive studies of their physical and chemical properties. La0.9Mn1.1O3 (LMO) ceramics have been synthesized at an annealing temperature tann of 1150 °C with further post-annealing at 1250, 1350, and 1450 °C. As tann increases, the structure symmetry changes, and both the crystallite size and chemical defects increase. The post-annealing, on one hand, leads to a dramatic reduction of the magnetocaloric effect (MCE) |−ΔSmaxM| from 3.50 to 0.75 J (kg K)−1 at 2 T and a Curie temperature TC from 227 to 113 K with increasing tann. On the other hand, an external hydrostatic high-pressure P works oppositely enhancing ferromagnetic interactions. The saturation of −ΔSmaxM and TC is already achieved at a relatively low P of ≈ 0.4 GPa. LMO-1150 exhibits the best magnetocaloric characteristics compared with other studied samples. Moreover, the electrochemical characteristics of the LMO materials as electrocatalysts for overall water splitting (OER process) and features of their transformation in different 0.5 M K2SO4, 0.5 M K2HPO4, and 0.1 M K2B4O7 electrolytes have been studied thoroughly. After electrocatalysis of LMO, the magnetization M decreases and TC remains, which makes it possible to control the depletion of electrodes and predict their working time based on the magnetic measurements. All samples show the best OER activity in the 0.5 M K2HPO4 media. The obtained results demonstrate the ways for controlling the MCE of LMO under changing internal and external conditions, and an evaluation of the possibilities for their OER applications in electrocatalysts.
研究领域:
材料科学
·
凝聚态物理
·
电化学
·
功能陶瓷
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磁学
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能源材料
·
催化化学
✓ 已验证
DOI
高影响因子
PHYSICA SCRIPTA
·
2020
·Vol. 95
·期 10
·105705
·
IF 1.985
Xiaoyong Gao,Xin Zhang
Compositional stability of perovskites is crucial for perovskite solar cells (PSCs) application because of directly affecting the performance of PSCs. Highly crystallized perovskite MAPbBr3 (MA = CH3NH3) with micronscale crystallites are usually fabricated via the one-step sol-gel process that uses strongly coordinating organic solvents. The two-step sol-gel process using weakly coordinating organic solvent is rarely used to fabricate MAPbBr3 films with relatively small crystallites. However, the two-step sol-gel process is preferred to fabricate PSCs because the residual PbBr2 can prevent the direct contact between electron- and hole-transporting layers. Thus in this work, perovskite MAPbBr3 films are fabricated via two-step sol-gel process using weakly coordinating isopropanol solvent. The compositional stability in dry ambient air and related optical properties of the films are intensively studied by a technique of post-annealing. A compositional transition from MAPbBr3 to PbBr2 occurs with increase of post-annealing temperature (Tpa). The product PbBr2 begins to form in the MAPbBr3 films at approximately 130 °C Tpa, and MAPbBr3 is fully thermally degraded to PbBr2 at 170 °C Tpa. The compositional stability of the films in dry air is inherently determined by instable organic cations (MA)+ and small electronegativity of Br−. The perovskite film initially shows a redshifted and then a blueshifted optical absorption edge with increase of Tpa, which is due to the decrease in film tensile stress and to the enhancement in thermal degradation to PbBr2, respectively. The increase in number of PbBr2 particles and defects in the films remarkably reduces the intensity of the green emission of MAPbBr3.
研究领域:
材料科学
·
太阳能电池
·
光电子学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Gang Peng,Xiayin Yao,Hongli Wan,Bingxin Huang,Jingyun Yin,Fei Ding,Xiaoxiong Xu
An insightful study on the fundamental lithium storage behavior of all-solid-state lithium battery with a structure of LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA)/Li 10 GeP 2 S 12 /Li-In is carried out in this work. The relationship between electrochemical performances and particle size, surface impurities and defects of the NCA positive material is systematically investigated. It is found that a ball-milling technique can decrease the particle size and remove surface impurities of the NCA cathode while also give rise to surface defects which could be recovered by a post-annealing process. The results indicate that the interfacial resistance between the NCA and Li 10 GeP 2 S 12 is obviously decreased during the ball-milling followed by a post-annealing. Consequently, the discharge capacity of NCA in the NCA/Li 10 GeP 2 S 12 /Li-In solid-state battery is significantly enhanced, which exhibits a discharge capacity of 146 mAh g −1 at 25 °C.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
电池技术
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 19
·2109867
·
IF 32.086
Jing Li,Jiao Xu,Yanan Bao,Jianliang Li,Hengshan Wang,Chengyu He,Meiqi An,Huayi Tang,Zhiguang Sun,Yurui Fang,Shuang Liang,Yiming Yang
Anion-exchange in halide perovskites provides a unique pathway of bandgap engineering for fabricating heterojunctions in low-cost photovoltaics and optoelectronics. However, it remains challenging to achieve robust and sharp perovskite heterojunctions, due to the spontaneous anion interdiffusion across the heterojunction in 3D perovskites. Here, it is shown that the anionic behavior in 1D perovskites is fundamentally different, that the anion exchange can readily drive an indirect-to-direct bandgap phase transition in CsPbI 3 nanowires (NWs) and greatly lower the phase transition temperature. In addition, the heterojunction created by phase transition is epitaxial in nature, and its chemical composition can be precisely controlled upon postannealing. Further study of the phase transition dynamics reveals a threshold-dominating anion exchange mechanism in these 1D NWs rather than the gradient-dominating mechanism in 3D systems. The results provide important insights into the ionic behavior in halide perovskites, which is beneficial for applications in solar cells, light-emitting diodes (LEDs), and other semiconductor devices.
研究领域:
光伏
·
光电子学
·
材料科学
·
半导体器件
·
纳米技术
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 12
·1760
·
IF 4.034
Ping Fan,Huan-Xin Peng,Zhuang-Hao Zheng,Zi-Hang Chen,Shi-Jie Tan,Xing-Ye Chen,Yan-Di Luo,Zheng-Hua Su,Jing-Ting Luo,Guang-Xing Liang
Lead-free double perovskites have been considered as a potential environmentally friendly photovoltaic material for substituting the hybrid lead halide perovskites due to their high stability and nontoxicity. Here, lead-free double perovskite Cs2AgBiBr6films are initially fabricated by single-source evaporation deposition under high vacuum condition. X-ray diffraction and scanning electron microscopy characterization show that the high crystallinity, flat, and pinhole-free double perovskite Cs2AgBiBr6films were obtained after post-annealing at 300 °C for 15 min. By changing the annealing temperature, annealing time, and film thickness, perovskite Cs2AgBiBr6solar cells with planar heterojunction structure of FTO/TiO2/Cs2AgBiBr6/Spiro-OMeTAD/Ag achieve an encouraging power conversion efficiency of 0.70%. Our preliminary work opens a feasible approach for preparing high-quality double perovskite Cs2AgBiBr6films wielding considerable potential for photovoltaic application.Keywords:lead-free;perovskite solar cell;thin film;single-source vapor deposition
研究领域:
材料科学
·
可再生能源
·
太阳能电池技术
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Yue Lv,Wenlin Feng,Xiaozhan Yang,Qingliang Feng
Flexible photodetectors have garnered significant research attention owing to their enormous application prospects in various emerging fields, such as flexible electronics, stretchable devices, implantable systems, portable devices, wearable technology, and optoelectronics. Black phosphorus (BP) with its high carrier mobility and layer-dependent bandgap tunability (0.3–2.0 eV) has emerged as a promising candidate material in the field of flexible optoelectronics. However, the preparation of BP films typically requires high-temperature and high-pressure conditions, which are often accompanied by expensive equipment, limiting their application in optoelectronics. In this study, a rapid and scalable liquid-phase interface assembly method for preparing large-area BP films is presented. Uniform films approximately 20 nm thick were fabricated, and for the first time, discrete perylene-3,4,9,10-tetracarboxylic dianhydride grains were modified through post-annealing treatment to form an organic-inorganic interfacial charge transfer doping. The entire preparation process is compatible with most rigid and flexible substrates. The resulting flexible devices demonstrate spectral response spanning 450–1550 nm with 24 ms response time, achieving a responsivity of 2.21 mA/W at 1550 nm under 7.18 mW/cm² power density. This compatible strategy bridges the gap between high-performance BP photonics and practical flexible integration.
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DOI
高影响因子
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