JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Jie Wang,Xirong Huang,Yinfei Liu,Feifei Huang,Renguang Ye,Hongping Ma,Youjie Hua,Shiqing Xu
Plant photosynthesis relies on photosynthetic pigments to absorb red and far-red light. Cr 3+ -doped ZnAl 2 O 4 exhibits superior red-light emission, holding great potential for plant illumination. Nevertheless, the luminescence efficiency of nanocrystalline glass-ceramics is limited by their crystal size. To address this issue, in this study, Cr 3+ -doped micron-sized ZnAl 2 O 4 devitrified glasses were fabricated via a cooling-induced self-crystallization method. Cr 3+ incorporation simultaneously modulates the crystallization kinetics of the devitrified glasses and significantly enhances the luminescent properties. The maximum luminescence intensity was obtained at the Cr 3+ doping concentration of 0.1 mol%. Notably, the as-prepared devitrified glasses retain approximately 84% of its room-temperature photoluminescence intensity, even at an elevated temperature of 150 ℃. The emission peak of the ZnAl 2 O 4 : Cr 3+ devitrified glasses in the red spectral region closely matches the absorption spectrum of phytochrome far-red, effectively satisfying the red-light requirement for plant photosynthesis. Electroluminescence (EL) characterization confirms its suitability for plant lighting applications. This work is of great significance for promoting the development of the plant lighting industry.
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高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Guanhua Zhang,Tiantian Dai,Yue Meng,Lianyang Zhang,Chao Yang,Guoxiang Pan,Zheming Ni,Shengjie Xia
Z-scheme heterojunction catalysts are novel photocatalytic materials with wide application prospects because of their promise for the engineering of band structure to achieve high-speed hot carrier-transfer and strong redox tunability. A bridged-Au Z-scheme heterojunction catalyst (ZnO-Au-ZnAl 2 O 4 ) was synthesized using layered double hydroxides (LDHs) as the backbone. The atomistic and architectural structures, elemental composition and and visible-light absorption of as-prepared photocatalysts were systematically investigated and characterized. The presence of Z-scheme heterojunctions in ZnO-Au-ZnAl 2 O 4 can significantly improve the photocatalytic activity under visible light irradiation with a reaction rate constant of 0.5503 h −1 (ZnO-Au(2%)-ZnAl 2 O 4 ), 27.2 times that of pure ZnO (0.0202 h −1 ) and 9.8 times that of ZnO-ZnAl 2 O 4 (0.0389 h −1 ). We further investigated the reaction kinetics of the heterostructure catalyst in the photodegradation of catechol , where the effect of the catalyst dosage, initial pH, irradiation intensity and reaction temperature were discussed. Based on the mechanism study in the capture and detection of photo-generated radicals and the calculation of band structures by DFT (work function), the successful construction of bridged-Au Z-scheme heterojunction was further proven. Au nanoparticles sandwiched between ZnO and ZnAl 2 O 4 play a vital role for the formation of a built-in electric field (BIEF) between ZnO and ZnAl 2 O 4 , which can significantly facilitate the transfer of hot carriers in the photocatalytic system.
研究领域:
材料科学
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环境科学
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高影响因子
CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Han Xu,Gangsong Huang,Wenting Zhou,Xuan Miao,Hongjun Ji,Mingyu Li,Yufeng Li
In the realm of electronic packaging advancements, the utilization of metal to ceramic joints has garnered significant attention. This manuscript details the development of a specific glass solder with excellent wettability and a thermal expansion coefficient of 8.1 × 10 −6 °C −1 , comprising 35Bi 2 O 3 -30B 2 O 3 -15ZnO-20SiO 2 (mol.%). This design achieves reliable connection of the Al 2 O 3 ceramics and Kovar alloy in an atmospheric environment. The interface reaction between the glass solder, Al 2 O 3 ceramics, and oxidized Kovar alloy resulted in the formation of ZnAl 2 O 4 particles and Bi spheres at the joints. The enhancement in joint shear strength was primarily attributed to the nanoscale, dispersed ZnAl 2 O 4 particles. However, the presence of microscale Bi spheres, with a lower elastic modulus than the glass solder, initiated cracks during shear deformation, thereby compromising the integrity of the joint. Optimization of brazing temperatures enabled control over the ZnAl 2 O 4 and Bi sphere phases within the joints, yielding a peak shear strength of 51.7 ± 8.9 MPa at 650 °C. This study highlights the achievement of high-performance metal-ceramic bonding through tailored interface reactions and optimized joint microstructures.
研究领域:
材料科学
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电子封装
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连接技术
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陶瓷-金属连接
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玻璃焊料
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高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 21
·2400574
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IF 8
Chenyang Zhan,Haomiao Zhu,Sisi Liang,Wendong Nie,Zihao Wang,Maochun Hong
Transition metal ions, such as Cr 3+ , Fe 3+ , and Ni 2+ , are widely recognized activators for efficient broadband near-infrared (NIR) phosphors. However, the potential of Mn 2+ ions as NIR-emitting activators is relatively overlooked due to their typically narrowband emission in the visible spectral region and relatively weak absorption. Herein, a heavy Mn 2+ -doped Zn 1-x Al 2 O 4 : xMn 2+ (ZAO: xMn 2+ ) phosphor is presented that exhibits a single NIR emission band peaked at 830 nm with a bandwidth of 135 nm under excitation at 450 nm. Through comprehensive structural and spectral analysis, this NIR band is attributed to the emission originating from Mn 2+ ions within the MnO 6 octahedra. Importantly, the formation of Mn 2+ –Mn 2+ dimers breaks the spin-forbidden rule and significantly enhances the transition probability, as supported by the excited state dynamic analysis. Consequently, the optimal ZAO: 0.70Mn 2+ sample shows high internal/external photoluminescence quantum yields of 85.8%/36.9%, along with good thermal stability demonstrated by the emission intensity at 423 K retains 60% of that at 298 K. Finally, a prototype NIR pc-LED device is fabricated by combining ZAO: 0.70Mn 2+ phosphor with a 450 nm blue diode chip, generating an NIR output power of 28.84 mW at 100 mA. This study provides novel insights into high-performance Mn 2+ -activated NIR phosphors.
研究领域:
材料科学
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光学
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高影响因子
ACS Omega
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2018
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IF 0
Qizhou Dai,Zhuo Zhang,Tingting Zhan,Zhong-Ting Hu,Jianmeng Chen
This study presents a novel spinel-type zinc aluminate nanometer catalyst and is applied in catalytic ozonation for wastewater treatment. The zinc aluminate (ZnAl2O4) catalysts were synthesized by hydrothermal, sol–gel, and coprecipitation methods, and their characteristics were analyzed by X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray spectrum, Fourier transform infrared, and X-ray photoelectron spectroscopy (XPS) techniques. 5-Sulfosalicylic acid (SSal) was selected as the typical pharmaceutical and personal care product and used to evaluate the catalytic activity of ZnAl2O4. Compared to ozonation, an obviously higher removal efficiency for the SSal degradation was achieved with the nanocatalyst addition in catalytic ozonation. The removal of SSal and chemical oxygen demand reached 64.8 and 46.2%, respectively, after 60 min in the presence of ZnAl2O4, whereas it was only 49.4 and 33.2%, respectively, in ozonation. The comparison of catalysts showed that the ZnAl2O4 prepared by the hydrothermal method presented a better catalytic activity in ozonation. The effect of radical scavenger experiment results and the characterization of XPS implied that •OH was the main active oxidative species in catalytic ozonation. The reusability results showed that the ZnAl2O4 catalyst possessed a high stability and could be widely used in catalytic ozonation for wastewater treatment.
研究领域:
环境工程
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催化
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水处理
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PubMed
ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Fei Zhou,Zhiqi Gong,Renheng Wang,Mengran Guo,Rong Zeng,Yun Li,Zhe Xiao,Long Qie,Jianwen Liu
Deciphering the relationship between electron configuration and catalytic activity is crucial for designing electrocatalysts that improve the efficient conversion of lithium polysulfides (LiPSs). In this study, amorphous ZnAl 2 O 4 (referred to as A-ZnAl 2 O 4 ) is designed with a high oxygen vacancy concentration. Experimental and theoretical analysis confirm that the Zn tetrahedral sites are sufficiently exposed, and the catalytic activity is significantly enhanced due to a narrow bandgap and a high spin state achieved through low coordination numbers and a disordered structure. Both the enhancement in electron transfer efficiency and reduction in reaction energy barriers accelerate the multi-phase transformation of LiPSs, resulting in impressive electrochemical performance with a capacity retention rate of 93.9% after 800 cycles at a high current density of 4 C. And the pouch battery with high sulfur loading of 4.5 mg cm −2 and lean electrolyte at 8 µL mg −1 exhibits high discharge capacity and stable cycling. This research deciphers the amorphization on modulating electronic structures to achieve enhanced electrocatalytic activity, providing a general strategy for designing unique atomic-scale band structures and spin states in multifunctional electrocatalysts.
研究领域:
材料科学
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电化学
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能源存储
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高影响因子
危险品化学品经营许可证（带存储）