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Journal of Materiomics 2023年第4期9卷 701-708页

作者： Liang Shi Kui Liu Cheng Liu dainan zhang Huaiwu zhang School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu610054China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China

Dielectric ceramics are promising in large-scale commercial millimeter-wave communication technology,such as 5G and the upcoming 6G,thanks to their excellent frequency selection characteristics and environmental *** this work,various contents of SbeO bonds were introduced into the MgTa_(2)O_(6)lattice using the solid-phase reaction method to investigate the effects on the lattice and microwave dielectric *** confirms that Sb ions successfully occupy Ta sites in the lattice and cause lattice shrinkage and crystallinity deterioration,which leads to a slight decrease in the quality ***,DFT calculations reveal that the doping leads to electron-biased aggregation toward O atoms,causing higher SbeO ionicity,but also attenuates the degree of ionization of Ta and Mg ions,which makes the dielectric constant of the doped samples vary non-monotonically with gradient ***,Sb doping substantially enhanced the thermal stability of the ceramics,with TCF values reduced from 36×10^(-6)℃^(-1)to 15×10^(-6)℃^(-1).

关键词： MgTa_(2)O_(6)ceramics Dielectric Raman DFT calculation

Effect of Al_2O_3 Buffer Layers on the Properties of Sputtered VO_2 Thin Films

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Nano-Micro Letters 2017年第3期9卷 52-59页

作者： dainan zhang Tianlong Wen Ying Xiong Donghong Qiu Qiye Wen State Key Laboratory of Electronic Films and Integrated Devices University of Electronic Science and Technology of China Department of Electrical and Computer Engineering University of Delaware

VO_2 thin films were grown on silicon substrates using Al_2O_3 thin films as the buffer layers. Compared with direct deposition on silicon, VO_2 thin films deposited on Al_2O_3 buffer layers experience a significant improvement in their microstructures and physical properties. By optimizing the growth conditions, the resistance of VO_2 thin films can change by four orders of magnitude with a reduced thermal hysteresis of 4 °C at the phase transition temperature. The electrically driven phase transformation was measured in Pt/Si/Al_2O_3/VO_2/Au heterostructures. The introduction of a buffer layer reduces the leakage current and Joule heating during electrically driven phase transitions. The C–V measurement result indicates that the phase transformation of VO_2 thin films can be induced by an electrical field.

关键词： Al2O3 Buffer layers Atomic layer deposition VO2 thin films Heterostructure

A review of Fe_3O_4 thin films:Synthesis,modification and applications

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Journal of Materials Science & Technology 2018年第8期34卷 1259-1272页

作者： Xiaoyi Wang Yulong Liao dainan zhang Tianlong Wen Zhiyong Zhong Center for Applied Chemistry University of Electronic Science and Technology of China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China

Magnetite （Fe3O4） has been used for thousands of years as one of the important magnetic materials. The rapid developments of thin film technology in the past few decades attract the attention of material scientists on the fabrication of magnetite thin films. In this article, we present an overview of recent progress on Fe3O4 thin films. The widely used preparation methods are surveyed, and the effect of sub- strates is discussed. Specifically the modified Fe3O4 thin films exhibit excellent electrical and magnetic properties compared with the pure films. It is noteworthy that modified Fe3O4 thin films can be put into two categories：（1） doped films, where foreign metal ions substitute iron ions at A or B sites： and （2） hybrid films, where magnetite phases are mixed with other materials. Notably, Fe3O4 thin films show great potentials in many applications such as sensors and batteries. It is expected that the investigations of Fe3O4 thin films will give us some breakthroughs in materials science and technology.

关键词： Fe3O4 Thin film Preparation method Modified film Material science

Review of Water-Assisted Crystallization for TiO_2 Nanotubes

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Nano-Micro Letters 2018年第4期10卷 366-393页

作者： Xiaoyi Wang dainan zhang Quanjun Xiang Zhiyong Zhong Yulong Liao State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Center for Applied Chemistry University of Electronic Science and Technology of China

TiO_2 nanotubes(TNTs) have drawn tremendous attention owing to their unique architectural and physical properties. Anodizing of titanium foil has proven to be the most efficient method to fabricate well-aligned TNTs,which, however, usually produces amorphous TNTs and needs further thermal annealing. Recently, a water-assisted crystallization strategy has been proposed and investigated by both science and engineering communities. This method is very efficient and energy saving, and it circumvents the drawbacks of thermal sintering approach. In this paper, we review the recent research progress in this kind of lowtemperature crystallization approach. Here, various synthetic methods are summarized, and the mechanisms of the amorphous–crystalline transformation are analyzed. The fundamental properties and applications of the low-temperature products are also discussed. Furthermore, it is proved that the water-assisted crystallization approach is not only applicable to TNTs but also to crystallizing other metal oxides.

关键词： TiO2nanotube Crystallization Waterassisted Low-temperature

Synthesis of yttrium iron garnet/bismuth quantum dot heterostructures with localized plasmon enhanced magneto-optical performance

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Journal of Materials Science & Technology 2020年第16期47卷 32-39页

作者： Lichuan Jin Caiyun Hong dainan zhang Peng Gao Yiheng Rao Gang Wang Qinghui Yang Zhiyong Zhong Huaiwu zhang State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China School of Science Westlake UniversityHangzhou310024China Electron Microscopy Laboratory and International Center for Quantum MaterialsSchool of PhysicsPeking UniversityBeijing100871China Collaborative Innovation Centre of Quantum Matter Beijing100871China

Interactions between light and magnetic matter attracted great attention lately due to their potential applications in nanophotonics,spintronics,and high-accuracy ***,we grew bismuth quantum dots(Bi–QDs)with strong spin–orbit coupling on a magnetic insulator yttrium iron garnet(YIG)via molecular beam *** YIG/Bi–QDs material shows an enhanced magneto-optical Kerr rotation up to 130%compared with that of a bare YIG *** Bi–QDs were also introduced onto a lutetium–bismuth co-doped YIG film to form a hybrid system with remarkably enhanced Kerr rotation(from 1626 to 2341 mdeg).Ferromagnetic resonance measurements showed an increased effective magnetization as well as interfacial spin–orbit field in the YIG/Bi–QD *** plasmons were mapped using electron energy loss spectroscopy with high spatial resolution,revealing enhanced plasmon intensity at both the Bi–QD surface and YIG/Bi–QD *** Bi-QDs onto the YIG film enhanced Kerr rotation owing to the attenuated optical reflection and increased effective *** Bi–QDenhanced magneto-optical effect enables development of efficient nanoscale light switching,spintronics,and even plasmonic nano-antennas.

关键词： Electron energy loss spectroscopy Surface plasmon resonance Magneto-optical materials Bismuth quantum dot Ferromagnetic resonance

Low-loss Cd-substituted Mg ferrites with matching impedance for high-frequency-range antennas

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Journal of Magnesium and Alloys 2021年第4期9卷 1403-1413页

作者： Gongwen Gan dainan zhang Jie Li Gang Wang Xin Huang Yan Yang Yiheng Rao Xueying Wang Huaiwu zhang Ray T.Chen State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaNo.4Section 2North Jianshe RoadChengdu 610054China Microelectronic Research Center Department of Electrical and Computer EngineeringUniversity of Texas at AustinAustinTX 78758USA

The effects of Cd^(2+) ions on the microstructure,magnetic properties,and dielectric properties of Bi_(2)O_(3)-added MgFe_(2)O_(4) ferrites(Cd_(x)Mg_(1-x)Fe_(2)O_(4),x=0.00,0.15,0.30 and 0.45)are obtained by adopting the solid-state reaction method at a low temperature(910℃).The objective is to achieve matching impedances,low magnetic and dielectric losses(tanδμand tanδε,respectively),and a relatively large miniaturization factor to reduce antenna *** results indicate that the cations occupying the tetrahedral(A)and octahedral(B)ion sites are redistributed,resulting in an enhanced super-exchange interaction between the two *** a result,improved magnetization,including the increase in saturation magnetization(41.74 emu/g)and decrease in coercivity(63.75 Oe),is *** real part of permeability(μ')also increases with increasing concentration of Cd^(2+) *** x is 0.15,matching impedances with equivalent μ'and ε'values are obtained over a long frequency range(1–150MHz).Moreover,the formation of a dense microstructure guarantees that losses occur at low orders of magnitude(tanδμ≈10−2 and tanδε≈10−3).Accordingly,these properties afford wide application perspectives for the proposed compounds in the high-frequency region,i.e.,from high-frequency to very-high-frequency bands.

关键词： Cd-substituted Mg compounds Magnetic properties Dielectric properties Matching impedance Low loss High frequency antenna

Thermal insulation design for efficient and scalable solar water interfacial evaporation and purification

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Journal of Materials Science & Technology 2021年第7期66卷 157-162页

作者： Jiahui Chen dainan zhang Song He Gengpei Xia Xiaoyi Wang Quanjun Xiang Tianlong Wen Zhiyong Zhong Yulong Liao Center for Applied Chemistry University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Chengdu Institute of Product Quality Inspection Co. Ltd.Chengdu 610000China

In recent years, solar desalination and water evaporation/purification with various artificial architectures have drawn significant attention. Herein, we introduce a rational design structure for efficient solar water evaporation and purification, focusing on the balance between water transportation and thermal *** wood after a simple flame treatment on the surface was utilized as the solar absorber, with a high solar absorbance(~90 %), good hydrophilicity, and excellent heat localization abilities. Besides,a thermal insulator(polystyrene foam) was used to further reduce the thermal loss, and the optimized ratio between the water path and thermal insulator was obtained. A set of floating foam-flamed-wood(F-F-wood) devices were fabricated with a high evaporation rate of 3.92 kgm-2 h-1, exhibiting photothermal purification abilities from seawater and wastewater containing organic dyes and heavy metals. This study sheds light on the rational design of scalable and low-cost devices for solar water evaporation and purification.

关键词： Biomaterials Thermal insulation Solar water evaporation Purification

Enhanced photocatalytic hydrogen production activity of highly crystalline carbon nitride synthesized by hydrochloric acid treatment

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Chinese Journal of Catalysis 2020年第1期41卷 21-30页

作者： Yang Li dainan zhang Xionghan Feng Quanjun Xiang State Key Laboratory of Electronic Thin Film and Integrated Devices School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina College of Resources and Environment Huazhong Agricultural UniversityWuhan 430070SichuanChina

Crystalline carbon nitride(CCN)prepared by a molten-salt method is attracting increased attention because of its promising properties and excellent photocatalytic *** this work,we further improve the crystallinity of CCN through synthesis by the molten-salt method under the action of aqueous hydrochloric acid(HCl)*** results showed that the crystallinity of the as-prepared samples increased with increasing HCl concentration and reached the maximum value at 0.1 mol L^-*** can be attributed to the removal of some potassium ions(K+)from the terminal amino groups of CCN by the aqueous HCl solution,which results in a release of the polymerization *** a result,the crystallinity of the as-prepared samples further ***,the obtained 0.1 highly crystalline carbon nitride(0.1HCCN;treated with 0.1 mol L^-1 aqueous HCl solution)exhibited an excellent photocatalytic hydrogen evolution of 683.54μmol h^-1 g^-1 and a quantum efficiency of 6.6%at 420 nm with triethanolamine as the sacrificial *** photocatalytic hydrogen evolution was 2 and 10 times higher than those of CCN and bulk carbon nitride,*** enhanced photocatalytic activity was attributed to the improved crystallinity and intercalation of K+into the xHCCN *** improved crystallinity can decrease the number of surface defects and hydrogen bonds in the as-prepared sample,thereby increasing the mobility of the photoinduced carriers and reducing the recombination sites of the electron-hole *** K+intercalated into the xHCCN interlayer also promoted the transfer of the photoinduced electrons because these ions can increase the electronic delocalization and extend theπ-conjugated *** study may provide new insights into the further development of the molten-salt method.

关键词： Crystalline carbon nitride Molten-salt method Photocatalytic hydrogen evolution Potassium ions Aqueous hydrochloric acid solution

Highly crystalline carbon nitride hollow spheres with enhanced photocatalytic performance

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Chinese Journal of Catalysis 2021年第4期42卷 627-636页

作者： Yang Li dainan zhang Jiajie Fan Quanjun Xiang State Key Laboratory of Electronic Thin Film and Integrated Devices School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina College of Resources and Environment Huazhong Agricultural UniversityWuhan 430070HubeiChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002HenanChina

Graphitic carbon nitride(g-C_(3)N_(4))has emerged as a remarkably promising photocatalyst for addressing environmental and energy issues;however,it exhibits only moderate photocatalytic activity because of its low specific surface area and high recombination of *** of crystalline g-C_(3)N_(4) by the molten salt method has proven to be an effective method to improve the photocatalytic ***,crystalline g-C_(3)N_(4) prepared by the conventional molten salt method exhibits a less regular ***,highly crystalline g-C_(3)N_(4) hollow spheres(CCNHS)were successfully prepared by the molten salt method using cyanuric acid-melamine as a *** higher crystallization of the CCNHS samples not only repaired the structural defects at the surface of the CCNHS samples but also established a built-in electric field between heptazine-based g-C_(3)N_(4) and triazine-based g-C_(3)N_(4).The hollow structure improved the level of light energy utilization and increased the number of active sites for photocatalytic *** of the above characteristics,the as-prepared CCNHS samples simultaneously realized photocatalytic hydrogen evolution with the degradation of the plasticizer bisphenol *** research offers a new perspective on the structural optimization of supramolecular self-assembly.

关键词： Crystalline Hollow spheres Graphitic carbon nitride Photocatalytic hydrogen evolution Photocatalytic degradation Plasticizer

Structural engineering of 3D hierarchical Cd0.8Zn0.2S for selective photocatalytic CO2 reduction

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Chinese Journal of Catalysis 2021年第1期42卷 131-140页

作者： Lei Cheng dainan zhang Yulong Liao Jiajie Fan Quanjun Xiang State Key Laboratory of Electronic Thin Film and Integrated Devices School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002HenanChina

The solar-driven catalytic conversion of CO2 to useful chemical fuels is regarded as an environmentally friendly approach to reduce the consumption of fossil fuels and mitigate the greenhouse ***,it is highly intriguing and challenging to promote the selectivity and efficiency of visible-light-responsive photocatalysts that favor the adsorption of CO2 in photoreduction *** this work,three-dimensional hierarchical Cd0.8Zn0.2S flowers(C8Z2S-F)with ultrathin petals were successfully synthesized through an in-situ self-assembly growth process using sodium citrate as a morphology *** flower-like Cd0.8Zn0.2S solid solution exhibited remarkable photocatalytic performance in the reduction of CO2,generating CO up to 41.4μmol g^−1 under visible-light illumination for 3 h;this was nearly three times greater than that of Cd0.8Zn0.2S nanoparticles(C8Z2S-NP)(14.7μmol g^−1).Particularly,a comparably high selectivity of 89.9%for the conversion of CO2 to CO,with a turnover number of 39.6,was obtained from the solar-driven C8Z2S-F system in the absence of any co-catalyst or sacrificial *** time-domain spectroscopy indicated that the introduction of flower structures enhanced the light-harvesting capacity of *** in situ diffuse reflectance infrared Fourier transform spectroscopy unveiled the existence of surface-adsorbed species and the conversion of photoreduction intermediates during the photocatalytic *** characterizations and predictions of the photocatalytic mechanism demonstrated that the flower-like Cd0.8Zn0.2S solid solution possessed desirable CO2 adsorption properties and an enhanced charge-transfer capability,thus providing a highly effective photocatalytic reduction of CO2.

关键词： Cd0.8Zn0.2S flowers Self-assembly growth Photocatalytic CO2 reduction High selectivity Visible-light irradiation