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学者姓名：张洪
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Abstract ：
TiO2-based magnetic semiconductor has attracted great interest, due to its controllable spin polarization effect and stable ferromagnetism at room temperature. However, the mechanism of its room temperature ferromagnetic performance (RTFM) is still an open question, attributed to the dispute regarding the origin of RTFM between impurity phase/defects and oxygen vacancy (VO defects). In the present work, the possible influence factors of RTFM in pure TiO2 were regulated by annealing the samples under argon or oxygen atmosphere for different duration, and the origin of RTFM was identified by revealing the correlation between RTFM and VO defects. Results indicate that the defects in samples are singly-ionized surface VO, and its concentration exhibits a steady increase with the increase of annealing duration under argon, and then decreases gradually with the annealing duration when further annealed in oxygen. All samples show prominent ferromagnetic performance with a trace of paramagnetism at room temperature, and the RTFM exhibits a similar trend to that of VO defects influenced by heat treatment process. Singly-ionized VO defects are determinant factor in giving rise to room temperature magnetism of pure TiO2. The aggregated singly-ionized VO defects induce RTFM by arising ferromagnetic exchange coupling with neighbor defects, while the isolated VO causes a trace of paramagnetism. The strategy proposed herein is effective to adjust surface VO defects and RTFM in pure TiO2, and it is also effective to reveal the mechanism of RTFM of pure TiO2.
Keyword ：
Ferromagnetic coupling effect Ferromagnetic coupling effect Pure TiO2 nanopowder Pure TiO2 nanopowder Room temperature ferromagnetism Room temperature ferromagnetism Singly-ionized surface oxygen vacancy Singly-ionized surface oxygen vacancy
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| GB/T 7714 | Zhang, Hong , Yang, Yuze , Lin, Rui et al. Room temperature ferromagnetic performance controlled by surface oxygen vacancy in pure TiO2 nanopowder annealed in Ar/O2 atmosphere for different duration [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1017 . |
| MLA | Zhang, Hong et al. "Room temperature ferromagnetic performance controlled by surface oxygen vacancy in pure TiO2 nanopowder annealed in Ar/O2 atmosphere for different duration" . | JOURNAL OF ALLOYS AND COMPOUNDS 1017 (2025) . |
| APA | Zhang, Hong , Yang, Yuze , Lin, Rui , Wang, Yuzhu . Room temperature ferromagnetic performance controlled by surface oxygen vacancy in pure TiO2 nanopowder annealed in Ar/O2 atmosphere for different duration . | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1017 . |
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本发明涉及共轭分子领域，公开了一种A‑D‑A型引达省并二噻吩平面共轭衍生物及其制备方法和应用。本发明创造性地设计与合成一种A‑D‑A型引达省并二噻吩平面共轭衍生物，采用引达省并二噻吩单元作为分子中心，引入苯并二噻吩作为π桥结构调节其光吸收，并在末端连接吸电子基团促进载流子传输。所述A‑D‑A型引达省并二噻吩平面共轭衍生物用于有机太阳能电池活性层添加剂，与目前高性能的活性层材料具有较好的光吸收互补性，同时具有较好的电荷传输特性与适当的电子能级。本发明合成的引达省并二噻吩共轭衍生物具有合理的能级与好的光吸收能力，能够有效的提升有机太阳能电池的短路电流与光电转化效率。
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| GB/T 7714 | 欧阳新华 , 周惠 , 林睿 et al. 一种A-D-A型引达省并二噻吩平面共轭衍生物及其制备方法和应用 : CN202311234123.7[P]. | 2023-09-23 . |
| MLA | 欧阳新华 et al. "一种A-D-A型引达省并二噻吩平面共轭衍生物及其制备方法和应用" : CN202311234123.7. | 2023-09-23 . |
| APA | 欧阳新华 , 周惠 , 林睿 , 张洪 . 一种A-D-A型引达省并二噻吩平面共轭衍生物及其制备方法和应用 : CN202311234123.7. | 2023-09-23 . |
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C-doped titanium dioxide nanoparticles (C-TiO2) were synthesized through a two-step sol-gel process aided by carboxymethyl cellulose (CMC) as C source, following by annealed at different temperature under vacuum. Lattice defects and room temperature ferromagnetism (RTFM) influenced by C doping and annealing tempera-ture are investigated in detail. Correlation between the variation tendency of defects and that of saturation magnetization (Ms) of C-TiO2 is determined, and influence mechanism of defects on RTFM is clarified. Results reveal that influenced by the increase of annealing temperature, C-TiO2 transforms from anatase to rutile phase, followed by some brookite phase and a small amount of elemental carbon precipitate. Three types of defects are introduced in C-TiO2 lattice, namely, substitutional C atoms at titanium sites (CTi), interstitial C defects (Ci) and oxygen vacancies (VOs). Content of CTi shows a gradual increase with increase in annealing temperature from 200 degrees C to 500 degrees C, after which a decrement is observed, and that of Ci shows an opposite tendency, while VOs content increases monotonically with increased annealing temperature. Influenced by annealing temperature, Ms shows a similar variation tendency to that of CTi. Joint effect of CTi and VOs promotes the formation of RTFM in C-TiO2, and CTi defects play a major role by inducing ferromagnetic coupling interaction between C 2p and O 2p states. CMC is a more suitable C source than citric acid to induce remarkable room temperature ferromagnetic behavior in C-TiO2 nanoparticles.
Keyword ：
Carboxymethyl cellulose Carboxymethyl cellulose C -doped titanium dioxide nanoparticles C -doped titanium dioxide nanoparticles Defects Defects Room temperature ferromagnetism Room temperature ferromagnetism
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| GB/T 7714 | Zhang, Hong , Wang, Yuzhu , Chen, Meixiang et al. Determining the influence mechanism of defects on remarkable room temperature ferromagnetic behavior for C-doped titanium dioxide aided by carboxymethyl cellulose as C source [J]. | CERAMICS INTERNATIONAL , 2023 , 49 (12) : 20576-20585 . |
| MLA | Zhang, Hong et al. "Determining the influence mechanism of defects on remarkable room temperature ferromagnetic behavior for C-doped titanium dioxide aided by carboxymethyl cellulose as C source" . | CERAMICS INTERNATIONAL 49 . 12 (2023) : 20576-20585 . |
| APA | Zhang, Hong , Wang, Yuzhu , Chen, Meixiang , Lin, Rui , Long, Bo . Determining the influence mechanism of defects on remarkable room temperature ferromagnetic behavior for C-doped titanium dioxide aided by carboxymethyl cellulose as C source . | CERAMICS INTERNATIONAL , 2023 , 49 (12) , 20576-20585 . |
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Realizing environmental compatibility and high power conversion efficiency (PCE) are crucial in the research of organic photovoltaics towards practical application. Applying environmentally friendly bio-materials into the modification of cathode interlayer (CIL) is a feasible approach to move towards both targets. In this research, three edible bio-acids, ursolic acid, citric acid, and malic acid, are employed to modify the PDIN CIL of the organic solar cells (OSCs) with non-fullerene acceptors. Among these edible bio-acid modifiers, ursolic acid shows its excellent performance in improving interfacial contact and suppressing charge recombination. It helps to obtain a good interfacial contact and facilitates the electron extraction. As a result, the photovoltaic performance is significantly improved. The average PCE are increased from 17.58% of the control devices to 18.35% of the PDIN + Ursolic Acid based devices, with a maximum PCE of 18.54%. It is the champion efficiency among the reported applications of bio-derived materials for the CILs. This study demonstrates the successful application of edible bio-acid, which offers an effective and green approach for the CIL modification to realize highly efficient OSCs.
Keyword ：
cathode interlayer cathode interlayer edible bio-acid edible bio-acid organic solar cell organic solar cell PDIN PDIN
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| GB/T 7714 | Wen, Junjie , Lin, Rui , Wu, Yibing et al. Environmentally friendly cathode interlayer modification on edible bio-acids with enhanced electron extraction and improved power conversion efficiency [J]. | ECOMAT , 2022 , 5 (4) . |
| MLA | Wen, Junjie et al. "Environmentally friendly cathode interlayer modification on edible bio-acids with enhanced electron extraction and improved power conversion efficiency" . | ECOMAT 5 . 4 (2022) . |
| APA | Wen, Junjie , Lin, Rui , Wu, Yibing , Zhang, Hong , Zhou, Hui , Liu, Zheng et al. Environmentally friendly cathode interlayer modification on edible bio-acids with enhanced electron extraction and improved power conversion efficiency . | ECOMAT , 2022 , 5 (4) . |
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Revealing the mechanism of room temperature ferromagnetism (RTFM) in carbon-doped TiO2 (C-TiO2) is critical to accelerate the development of TiO2-based spintronic devices. Herein, C-TiO2 nanoclusters were prepared by a sol-gel process using citric acid as C source, and the defects and RTFM of the samples were tuned by vacuum annealing at different temperature, and then the mechanism of RTFM induced by C doping is studied. Results revealed that with the increase of annealing temperature, residual organic precursor was gradually removed, and the phase transformed from pure anatase to rutile and brookite, followed by the precipitating of elemental C at 600 ? and 700 ?. Due to the doping of C, defects including substitutional C atoms for Ti sites (C-Ti), interstitial C atoms (C-i) and oxygen vacancy were introduced into the lattice. The concentration of C-Ti increases first till 500 ?, and then decreases gradually with the annealing temperature, while that of C-i exhibits opposite trend, and the oxygen vacancy concentration raises continuously. Influenced by the annealing temperature, RTFM of the samples exhibits similar trend to that of C-Ti, and the saturation magnetization (M-s) reaches the maximum at 500 ?. The RTFM is synergistically induced by C(Ti )and oxygen vacancy, and ferromagnetic p-p coupling interaction trigged by C(Ti )plays a more critical role. The results provide a significant reference for tuning the defects and RTFM in C-TiO2.
Keyword ：
Annealing temperature Annealing temperature C-dopedTiO(2) nanoclusters C-dopedTiO(2) nanoclusters Citric acid Citric acid Defects Defects Room temperature ferromagnetism Room temperature ferromagnetism
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| GB/T 7714 | Zhang, Hong , Wu, Ziming , Lin, Rui et al. Exploring the mechanism of room temperature ferromagnetism in C-doped TiO2 nanoclusters by tuning the defects by different annealing temperature using citric acid as C source [J]. | CERAMICS INTERNATIONAL , 2022 , 48 (18) : 26836-26845 . |
| MLA | Zhang, Hong et al. "Exploring the mechanism of room temperature ferromagnetism in C-doped TiO2 nanoclusters by tuning the defects by different annealing temperature using citric acid as C source" . | CERAMICS INTERNATIONAL 48 . 18 (2022) : 26836-26845 . |
| APA | Zhang, Hong , Wu, Ziming , Lin, Rui , Wang, Yuzhu . Exploring the mechanism of room temperature ferromagnetism in C-doped TiO2 nanoclusters by tuning the defects by different annealing temperature using citric acid as C source . | CERAMICS INTERNATIONAL , 2022 , 48 (18) , 26836-26845 . |
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Light is one of the key environmental factors influencing plant physiology and biochemistry, and light intensity (I),red and blue photon flux ratio (S) and photoperiod (P) are important light factors affecting plant growth, photosynthetic capability and metabolite accumulation. Nevertheless, little is known regarding the optimal combination of the three light factors for plant artificial cultivation and the effect of combination on plant physiology. In this study, Anoectochilus roxburghii(Wall.) Lindl., which is an important Chinese medicinal plant, was cultivated and continuously investigated under artificial light environment that the three light factors (I, S, P) were designed according to L-16(4(3))orthogonal array. The results showed that all the light factors significantly affected leaf area, stem diameter, plant length, dry weight, flavonoids and polysaccharides contents. Red and blue photon flux ratio and photoperiod significantly influenced pigment content, but light intensity did not significantly influence it. Chlorophyll fluorescence analysis showed that high light intensity not only could lead light stress, but also could promote photosynthetic capacity by combination with red and blue photon flux ratio and photoperiod. The improved protocols I2S2P2(I=60 mu molm(- 2)s(- 1), S=2:1 and P=10 h) and I4S1P4(I=100 mu mol m(-2)s(- 1), S=1:1 and P=14 h) were validated and demonstrated to be the optimal combinations for growth and total polysaccharides content (I2S2P2) and for flavonoids contents (I4S1P4) respectively. This study also demonstrated that orthogonal array design is an efficient way to establish improved protocols of light for artificial cultivation of A. roxburghii.
Keyword ：
Chlorophyll fluorescence Chlorophyll fluorescence Flavonoids Flavonoids Photoperiod Photoperiod Polysaccharide Polysaccharide Red and blue photon flux ratio Red and blue photon flux ratio
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| GB/T 7714 | Chen, Meixiang , Zeng, Xiping , Liu, Yinchun et al. An orthogonal design of light factors to optimize growth, photosynthetic capability and metabolite accumulation of Anoectochilus roxburghii (Wall.) Lindl. [J]. | SCIENTIA HORTICULTURAE , 2021 , 288 . |
| MLA | Chen, Meixiang et al. "An orthogonal design of light factors to optimize growth, photosynthetic capability and metabolite accumulation of Anoectochilus roxburghii (Wall.) Lindl." . | SCIENTIA HORTICULTURAE 288 (2021) . |
| APA | Chen, Meixiang , Zeng, Xiping , Liu, Yinchun , Zhang, Hong , Hu, Qichang . An orthogonal design of light factors to optimize growth, photosynthetic capability and metabolite accumulation of Anoectochilus roxburghii (Wall.) Lindl. . | SCIENTIA HORTICULTURAE , 2021 , 288 . |
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Thoroughly understanding the mechanism for the room temperature ferromagnetic performance (RTFM) in pristine TiO2 is crucial to the development of spintronic devices, and yet it is still under debated. To address this issue, pristine TiO2 nanoparticles were synthetized by a simple sol-gel technology and vacuum calcined under different air pressure in this work, and then the mechanism for the RTFM of the samples was systematically studied using X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman scattering spectroscopy, electron paramagnetic resonance (EPR) and vibrating sample magnetometer (VSM), respectively. It is revealed from the results that surface oxygen vacancies were introduced into the TiO2 lattice via vacuum calcining, and the surface oxygen vacancies concentration increases with the decrease of calcining air pressure. The sample calcined at atmospheric pressure (1.01 x 10(5) Pa) is found to be diamagnetic, while the rest samples (those calcined under the pressure lower than 1.01 x 10(5) Pa) exhibit obvious ferromagnetism at room temperature. Moreover, the RTFM in these ferromagnetic pristine TiO2 nanoparticles tuned by the calcining air pressure shows similar variation trend to that of surface oxygen vacancies concentration. Surface oxygen vacancies are suggested to play the decisive role in inducing the RTFM of pristine TiO2 nanoparticles. Surface oxygen. vacancies in TiO2 lattice are prone to capture electrons to form singly ionized oxygen vacancies, which trigger ferromagnetic exchange coupling interactions, thus give rise to RTFM in the pristine TiO2 nanoparticles. (C) 2020 Elsevier B.V. All rights reserved.
Keyword ：
Different calcining air pressure Different calcining air pressure Pristine TiO2 nanoparticles Pristine TiO2 nanoparticles Room temperature ferromagnetism Room temperature ferromagnetism Surface oxygen vacancies Surface oxygen vacancies
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| GB/T 7714 | Zhang, Hong , Huang, Wenqiang , Lin, Rui et al. Room temperature ferromagnetism in pristine TiO2 nanoparticles triggered by singly ionized surface oxygen vacancy induced via calcining in different air pressure [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 860 . |
| MLA | Zhang, Hong et al. "Room temperature ferromagnetism in pristine TiO2 nanoparticles triggered by singly ionized surface oxygen vacancy induced via calcining in different air pressure" . | JOURNAL OF ALLOYS AND COMPOUNDS 860 (2021) . |
| APA | Zhang, Hong , Huang, Wenqiang , Lin, Rui , Wang, Yuzhu , Long, Bo , Hu, Qichang et al. Room temperature ferromagnetism in pristine TiO2 nanoparticles triggered by singly ionized surface oxygen vacancy induced via calcining in different air pressure . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 860 . |
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To clarify the contribution of oxygen vacancies to room-temperature ferromagnetism (RTFM) in cobalt doped TiO2 (Co-TiO2), and in order to obtain the high level of magnetization suitable for spintronic devices, in this work, Co-TiO2 nanoparticles are prepared via the sol-gel route, followed by vacuum annealing for different durations, and the influence of vacuum annealing duration on the structure and room-temperature magnetism of the compounds is examined. The results reveal that with an increase in annealing duration, the concentration of oxygen vacancies rises steadily, while the saturation magnetization (M s) shows an initial gradual increase, followed by a sharp decline, and even disappearance. The maximum M s is as high as 1.19 emu/g, which is promising with respect to the development of spintronic devices. Further analysis reveals that oxygen vacancies, modulated by annealing duration, play a critical role in tuning room-temperature magnetism. An appropriate concentration of oxygen vacancies is beneficial in terms of promoting RTFM in Co-TiO2. However, excessive oxygen vacancies will result in a negative impact on RTFM, due to antiferromagnetic superexchange interactions originating from nearest-neighbor Co2+ ions. © 2021 Chinese Institute of Electronics.
Keyword ：
Annealing Annealing Cobalt compounds Cobalt compounds Ferromagnetism Ferromagnetism Oxygen vacancies Oxygen vacancies Room temperature Room temperature Saturation magnetization Saturation magnetization Sol-gel process Sol-gel process Sol-gels Sol-gels TiO2 nanoparticles TiO2 nanoparticles Titanium dioxide Titanium dioxide
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| GB/T 7714 | Huang, Wenqiang , Lin, Rui , Chen, Weijie et al. High room-temperature magnetization in Co-doped TiO2nanoparticles promoted by vacuum annealing for different durations [J]. | Journal of Semiconductors , 2021 , 42 (7) . |
| MLA | Huang, Wenqiang et al. "High room-temperature magnetization in Co-doped TiO2nanoparticles promoted by vacuum annealing for different durations" . | Journal of Semiconductors 42 . 7 (2021) . |
| APA | Huang, Wenqiang , Lin, Rui , Chen, Weijie , Wang, Yuzhu , Zhang, Hong . High room-temperature magnetization in Co-doped TiO2nanoparticles promoted by vacuum annealing for different durations . | Journal of Semiconductors , 2021 , 42 (7) . |
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Cu2ZnSnS4 (CZTS) thin films were fabricated through a sol-gel method followed by sulfurization. The metal contents were adjusted to study the mechanism of action on structural and photoelectric properties. With Zn contents increased, the optical band gap of CZTS matching worse and decreased the photo-current. With Cu contents increasing, the acceptor defects Cu-Zn decreased. The combined influence of the defects made the carrier concentration increased. When Zn/Sn was 1.15, and Cu/(Zn + Sn) was 0.87, the CZTS TFSCs had the best performance (eta = 1.58%, FF = 0.44, V-oc = 380 mV, and J(sc) = 9.55 mA/cm(2)) among all the samples.
Keyword ：
Cu2ZnSnS4 thin films Cu2ZnSnS4 thin films Solar cells Solar cells Sol-gel method Sol-gel method Stoichiometry Stoichiometry
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| GB/T 7714 | Long, Bo , Liao, Jie , Zhang, Hong et al. Mechanistic aspects of metal contents on the characteristics of Cu2ZnSnS4 and the solar cells [J]. | CHEMICAL PHYSICS LETTERS , 2020 , 754 . |
| MLA | Long, Bo et al. "Mechanistic aspects of metal contents on the characteristics of Cu2ZnSnS4 and the solar cells" . | CHEMICAL PHYSICS LETTERS 754 (2020) . |
| APA | Long, Bo , Liao, Jie , Zhang, Hong , Ruan, Kaibin . Mechanistic aspects of metal contents on the characteristics of Cu2ZnSnS4 and the solar cells . | CHEMICAL PHYSICS LETTERS , 2020 , 754 . |
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采用传统的高温固相反应法成功制备Sr_4Al_(14)O_(25):Mn~(4+)红色荧光粉。应用X射线粉末衍射仪、扫描电子显微镜、荧光分光光度计等对样品形貌和结构进行表征,研究煅烧温度、锰离子掺杂浓度对荧光粉发光性能的影响。实验结果表明,所制备的荧光粉具有从近紫外到蓝光宽广区域的吸收谱,并能发出强烈的中心波长位于656 nm的红光,这主要是源于Mn~(4+)离子的自旋禁止的~2E_g→~4A_2跃迁。在Sr_4Al_(14)O_(25):Mn~(4+)中,Mn~(4+)离子更倾向于进入AlO_6八面体中的替代Al~(3+)离子,当Mn~(4+)离子的掺杂浓度为x=0.02,煅烧温度为1 200℃时发光效率最高,内量子效率达到46.85%。所制荧光粉的色坐标为(0.716,0.284),且发射谱与叶绿素在红光区的吸收峰十分吻合,因而Sr_4Al_(14)O_(25):Mn~(4+)可用作白光LEDs和植物成长的LEDs红粉。
Keyword ：
光合作用 光合作用 光致发光 光致发光 发光二极管 发光二极管 荧光粉 荧光粉
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| GB/T 7714 | 吴义炳 , 阮凯斌 , 张洪 . Mn~(4+)掺杂Sr_4Al_(14)O_(25)荧光粉的制备及其发光性能 [J]. | 光电子·激光 , 2020 , 31 (06) : 613-620 . |
| MLA | 吴义炳 et al. "Mn~(4+)掺杂Sr_4Al_(14)O_(25)荧光粉的制备及其发光性能" . | 光电子·激光 31 . 06 (2020) : 613-620 . |
| APA | 吴义炳 , 阮凯斌 , 张洪 . Mn~(4+)掺杂Sr_4Al_(14)O_(25)荧光粉的制备及其发光性能 . | 光电子·激光 , 2020 , 31 (06) , 613-620 . |
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