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Optimizing Photocatalytic Performance: Composition-Dependent Methylene Blue Degradation Using Green-Synthesized Nanographene Oxide–Manganese Oxide Nanocomposites

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SSRN 2025年

作者： Mathew, Shanty Madanu, Thomas L. Kuriakose, Anna Kathyayini, H. Chandran, Ashly P. Su, Bao-Lian Colomer, Jean Francois St. Joseph’s Research Institute Shanthinagar Bengaluru India Department of Chemistry Sir M. Visvesvaraya Institute of Technology Off International Airport Road Bengaluru562157 India Centre for Incubation Innovation Research and Consultancy Jyothy Institute of Technology Thataguni Bengaluru India University of Namur Rue de Bruxelles 61 NamurB- 5000 Belgium University of Namur Rue de Bruxelles 61 NamurB-5000 Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

The presence of toxic dye compounds in industrial effluents poses a significant environmental and public health challenge. Therefore, sustainable techniques for the removal of dyes from wastewater, particularly from the printing and dyeing industries, are in high demand. Photocatalysis using nanocomposites has emerged as a promising solution to this issue. In this study, nanographene oxide-manganese oxide (NGO-Mn₃O₄) nanocomposites were synthesized using the sol-gel method in three different weight ratios: 1:9, 1:1, and 9:1. The crystalline structure, morphological features, and optical properties of these nanocomposites were characterized using powder X-ray diffraction (PXRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and Ultraviolet-visible Diffuse Reflectance Spectroscopy (UV-vis DRS). The photocatalytic performance of the NGO-Mn₃O₄ nanocomposites was evaluated by examining the degradation of methylene blue, a thiazine dye, under UV radiation at a wavelength of 254 nm. Among the three compositions, the 9:1 NGO-Mn₃O₄ nanocomposite exhibited excellent dye degradation with 96% efficiency in just 10 minutes. The study also revealed that composites with a lower band gap demonstrated enhanced photodegradation activity. © 2025, The Authors. All rights reserved.

关键词： Sol-gel process

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Enhanced performance of crystalline argyrodite Ag8SnSe6 based thermoelectric materials via one-step plasma activated sintering

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Journal of Alloys and Compounds 2025年 1031卷

作者： Melzi, Bachir Yang, Dongwang Zhang, Mingqi Jianan, Lyu Cui, Jingjing Gou, Weijie Zhong, Shenlong Yan, Yonggao Tang, Xinfeng Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

AgSnSe-based materials are currently becoming prominent as thermoelectric materials with advantageous characteristics at room and medium temperatures. These materials are generally obtained through standard techniques such as melting, annealing, and sintering, which require substantial amounts of energy and time. In this study, we produced Ag8SnSe6 bulks by using a non-equilibrium technique called one-step plasma-activated sintering, using raw elemental powders as starting materials. We achieved the formation of the orthorhombic Ag8SnSe6 phase in polycrystalline form at 873 K, which allowed us to investigate the influence of sintering temperature on the microstructural characteristics. Higher sintering temperatures resulted in an increase in phase purity and a decrease in the presence of secondary phase. In addition, we conducted a study on Ag8-x Sn1+xSe6 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) to investigate the influence of the fraction of Ag/Sn on the phase and thermoelectric properties. The samples exhibited excellent purity with minimal presence of Ag2Se precipitates, and the maximum thermoelectric figure of merit (zT) attained was 1.2. This accelerated synthesis method offers a significant advantage for large-scale manufacturing. © 2025 Elsevier B.V.

关键词： Polycrystalline materials

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synthesis and Characterization of Red Emissive Carbon Quantum Dots for Mb Degradation

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SSRN 2024年

作者： Khojiev, Shokir Khojieva, Gulmira Chen, Dan Chen, Jun Mohamed, Hemdan S.H. Liu, Jing Li, Yu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Hubei Wuhan430070 China School of International Education Wuhan University of Technology Wuhan430070 China Center for Advanced Technology under Agency for Innovative Development of the Republic of Uzbekistan The Ministry of Higher Education Science and Innovation University Street 3A Tashkent100174 Uzbekistan Department of Physical Chemistry Faculty of Chemistry National University of Uzbekistan University Street 4 Tashkent100174 Uzbekistan Physics Department Faculty of Science Fayoum University El Gomhoria Street Fayoum63514 Egypt

The one-step solvothermal method for the synthesis of R-CQDs by using 1,3-naphthalenediol was used. R-CQDs have an average particle size of 5nm with the functional groups, the presence of both D and G bands signifies successful construction of CQDs with sp2 core and sp3 hybridised matrix. R-CQDs exhibit a wide absorption peak at 512nm, while the emission intensity is highest at 610nm. R-CQDs show high photocatalytic performance for the photodegradation efficiency of 96% in 180 min. Its photocatalytic degradation rate constant was as 0.0167 min−1. R-CQDs demonstrated uniformly performance, making them superior photocatalyst in a variety of pH media. © 2024, The Authors. All rights reserved.

关键词： Degradation

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Resistive-switching tunability with size-dependent all-inorganic zero-dimensional tetrahedrite quantum dots

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Science China materials 2020年第12期63卷 2497-2508页

作者： Zhiqing Wang Yueli Liu Jie Shen Wen Chen Jun Miao Ang Li Ke Liu Jing Zhou State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

All-inorganic zero-dimensional(0D)tetrahedrite(Cu12Sb4S13,CAS)quantum dots(QDs)have attracted extensive attention due to their excellent optical properties,bandgap tunability,and carrier *** this paper,various sized CAS QDs(5.1,6.7,and 7.9 nm)are applied as a switching layer with the structure F:Sn O2(FTO)/CAS QDs/Au,and in doing so,the nonvolatile resistive-switching behavior of electronics based on CAS QDs is *** SET/RESET voltage tunability with size dependency is observed for memory devices based on CAS QDs for the first *** suggest that differently sized CAS QDs result in different band structures and the regulation of the SET/RESET voltage occurs simply and effectively due to the uniform size of the CAS ***,the presented memory devices have reliable bipolar resistive-switching properties,a resistance(ON/OFF)ratio larger than 104,high reproducibility,and good data retention *** 1.4×10^6s of stability testing and 104cycles of quick read tests,the change rate of the ON/OFF ratio is smaller than 0.1%.Furthermore,resistiveswitching stability can be improved by ensuring a uniform particle size for the CAS *** theoretical calculations suggest that the space-charge-limited currents(SCLCs),which are functioned by Cu 3d,Cu 3p and S 3p to act as electron selftrapping centers due to their quantum confinement and form conduction pathways under an electric field,are responsible for the resistive-switching *** paper demonstrates that CAS QDs are promising as a novel resistive-switching material in memory devices and can be used to facilitate the application of next-generation nonvolatile memory.

关键词： memory device tetrahedrite quantum dots resistive-switching tunability resistance mechanism

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Bifunctional Dimethyldichlorosilane Assisted Air-Processed Perovskite Solar Cell with Enhanced Stability and Low Voltage Loss

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SSRN 2022年

作者： Zhou, Peng Lu, Shaojuan Mo, Yanping Cheng, Jiahao Jiao, Chuanjia Zhang, Xiao-Li Li, Wangnan Liang, Guijie Wang, Jingyang Huang, Fuzhi Cheng, Yi-Bing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Institute of Aerospace Chemotechnology Xiangyang441003 China Hubei key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China School of Materials Science and Engineering Zhengzhou University Henan Province 450001 China Hubei Longzhong Laboratory Xiangyang441000 China Solar Hydrogen Production Lab Foshan Xianhu Laboratory of the Advanced Energy Science Technology Guangdong Laboratory Foshan China

Perovskite solar cells (PSCs) attract great interest due to high-efficiency and low-cost. However, perovskite materials are sensitive to moisture, causing it cannot be prepared in air, which increase the manufactory cost. To address it, we employ dimethyldichlorosilane (DMDCS) to passivate the grain boundaries and surfaces of MAPbI3 perovskite films, thus inhibiting the erosion of water. Then the preparation of highly efficient PSCs in air atmosphere is realized. The passivation mechanism of DMDCS on the perovskite film and interface is analyzed via investigating photo-excited carrier mobility and ultrafast transient adsorption spectroscopy (TAS). The results of TAS exhibit an improvement of charge carrier diffusion with an enhanced lifetime from 7.62 ps to 11.22 ps by the precursor doping. The charge carrier extraction at the interface is also greatly promoted with the decreased decay time from 0.29 ns to 0.16 ns by surface passivation, consistent well with the carrier mobility via space charge limited current (SCLC). The modified devices demonstrate an excellent efficiency of 20.69%, with a fill factor exceeding 80%. The optimized devices exhibit an excellent long-term environmental stability, retaining more than 80% of the initial efficiency after 1000 h in ambient with a relative humidity of 40 RH % without encapsulation. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

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Green N1 Additive Modified Perovskite Precursor Enables Effective Manufacturing of Large-Area Solar Cell Modules with High Efficiency and Stability

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SSRN 2023年

作者： Zang, Yue Shao, Tianxiang Jiao, Chuanjia Zhou, Peng Li, Wangnan Cheng, Jiahao Yang, Gaoyuan Tu, Yibo Ye, Jingchuan Li, Guodong Chu, Liang Lu, Shaojian Liang, Guijie Liang, Ying Wang, Jingyang Zhong, Zhicheng Hu, Run Yan, Wensheng Institute of Carbon Neutrality and New Energy School of Electronics and Information Hangzhou Dianzi University Hangzhou310018 China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China Hubei Longzhong laboratory Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Institute of Aerospace Chemotechnology Xiangyang441003 China School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan430074 China

Perovskite solar cells (PSCs) have been continuously breaking the solar photoelectric power conversion efficiency (PCE) record, while two long-standing challenges remain formidable on the practical commercialization path of PSCs, i.e. effective large-area manufacturing and high device operational stability. Here, we report a green additive of N-methyl-2-piperidone (N1) to modify the perovskite precursor, enabling the one-step mass manufacturing of high-quality large-area perovskite films with enhanced PCE and operational stability. The results show that due to the stronger complexation ability of N1 additive with PbI2, the generated PbI2-N1 complex can effectively prevent the preferential nucleation and realize lead halide-framework template-assistant crystallization reaction with organic cation in the one-step solution preparation of perovskite (FAPbI3)0.95(MAPbBr3)0.05 thin films, which result in the uniform grain size and smooth, dense film quality. Therefore, the PSCs device with small active area of 0.09 cm2 exhibits an efficiency of 22.2%, which is further improved to 23.2% by passivating the perovskite interface using PEAI. Moreover, highly-efficient slot-die printed 5×5 cm2 PSC module has been obtained with a champion PCE of 21% and improved operational stability over 1000 h. This work demonstrated a new strategy to realize high-quality large-scale perovskite films for solution-processed PSC modules, and may be further improved and extended to other kinds of PSCs and perovskite light-emitting diodes and detectors. © 2023, The Authors. All rights reserved.

关键词： Nucleation

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The influence of cooling rates on strain phase diagrams and domain structures of ferroelectric thin films: A case study of PbTiO3

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Acta Materialia 2025年 296卷

作者： Zhou, Meng-Jun Zhang, Peng Wang, Bo Yi, Di Nan, Ce-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Materials Science Division Lawrence Livermore National Laboratory Livermore 94550 CA United States School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China

Strain engineering has been established as an effective approach to control phase equilibria, domain configurations, and functional properties of ferroelectric thin films. Temperature-strain phase diagrams have been used as powerful tools for providing insights into strain engineering. However, almost all existing phase diagrams established using the phase-field approach assume quenching conditions without considering actual cooling rates during the post-deposition annealing process of ferroelectric thin films. Within this work, we systematically investigate the influence of cooling rates on domain structures and the strain-phase diagram of ferroelectric thin films using phase-field simulations, taking PbTiO3 thin films as a model system. We found that both the position of phase boundaries in the strain phase diagrams and the domain morphology are significantly influenced by the cooling rates. It is revealed that while the paraelectric-ferroelectric phase boundary remains invariant, the phase boundaries between single-phase and multi-phase regions tend to shift toward the corresponding multi-phase region as the cool rate reduces. Slow cooling generally leads to more ordered domain structures with increased domain size. Using the obtained equilibrium domain structures, we calculated effective thermal conductivities and found significant variations that can be tuned by the cooling rates. This work reveals an underexplored yet critical impact of cooling rates on phase equilibria and domain structures in ferroelectric thin films, which may inspire further fine-tuning of domains and domain walls in low-dimensional ferroelectrics for multifunctional applications.

关键词： Domain structures Ferroelectric thin films Phase diagrams Phase-field simulation Thermal conductivity

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Off-centering effect and crystal symmetry modification lead to high thermoelectric performance in diamondoid Cu2SnSe3

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National Science Open 2025年第3期 38-55页

作者： Pengpeng Chen Shulin Bai Yi Wen Yichen Li Zihao Zhao Dezheng Gao Houdong Huang Yixuan Hu Tian Gao Lei Wang Shaoping Zhan Xiang Gao Xianli Su Hongyao Xie Li-Dong Zhao School of Materials Science and Engineering Beihang University Center for Bioinspired Science and Technology Hangzhou International Innovation InstituteBeihang University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Center for High Pressure Science and Technology Advanced Research (HPSTAR)

Recently,dimensionless figure of merit （ZT） beyond 1.0 has been demonstrated in diamondoid Cu2SnSe3,positioning it as a low-cost and ecofriendly thermoelectric alternative,and sparking intense interest in further optimizing its thermoelectric ***,its intrinsic monoclinic structure and the compact packing of tetrahedral coordination lead to a light valence band and high thermal conductivity,which impede further performance improvement in ***,developing effective approaches to altering the local structure of Cu2SnSe3is important for further optimizing its thermoelectric ***,we identified and thoroughly investigated the atomic off-centering behavior in Cu2SnSe3,and demonstrated the electronic and phonon transport properties of Cu2SnSe3can be significantly enhanced by carefully modifying its monoclinic lattice into a distorted zinc-blende cubic structure via introducing Cd and off-centering Ag *** structure transition leads to band convergence and a reduction in the deformation potential of the material,resulting in a 7-fold enhancement in the density-of-state effective mass and an 85%increase in carrier ***,the off-centering effect results in strong acoustic-optical phonon scattering and an ultra-low lattice thermal conductivity of 0.3 W ***,a maximum ZT of 1.3 was obtained at 800 K for the Cu1.85Ag0.15Sn0.9Cd0.1Se3.

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Scalab.e polydopamine@ZrO2/PVDF composite ink for corrosion protection of magnesium alloy

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025年 721卷

作者： Li, Zhenyang Yang, Kai Zhang, Pengxiang Wang, Yunfan Peng, Jian Li, Bao-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices and Center of Biomedical Material and Engineering Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Two-dimensional (2D) materials have exhibited significant potential in the field of metal anticorrosion coatings. However, nanosheets with high electrical conductivity may promote "corrosion-enhancing activity," thereby compromising the protective efficacy of the coating. In contrast, metal oxide nanosheets derived from layered compounds present a promising alternative due to their favorable properties. In this study, a composite ink for AZ31 magnesium alloy anticorrosion with blade coating method is fabricated by polydopamine (PDA)-coated ZrO2 nanosheets/polyvinylidene fluoride (PVDF). The surface composition and microstructure of the resulting coating are systematically characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The anticorrosion properties of the composite coating are evaluated through potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The electrochemical results demonstrate that the ZrO2@PDA/PVDF coating achieves a corrosion protection efficiency of 99.93 %, with a corrosion current density of 9.48 × 10−8 A·cm−2, which is three orders of magnitude lower than that of bare AZ31. This study provides a new insight into the scalab.e application of metal oxide nanosheets in metal anticorrosion coatings. © 2025 Elsevier B.V.

关键词： Fourier transform infrared spectroscopy

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Chiral NIR-Ⅱ fluorescent Ag_(2)S quantum dots with stereospecific biological interactions and tumor accumulation behaviors

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Science Bulletin 2022年第12期67卷 1274-1283,M0004页

作者： Shaohua Qu Qian Jia Zheng Li Zhongliang Wang Li Shang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University(NPU)Xi’an 710072China Lab of Molecular Imaging and Translational Medicine(MITM) Engineering Research Center of Molecular&NeuroimagingMinistry of EducationSchool of Life Science and TechnologyXidian UniversityXi’an 710126China Academy of Advanced Interdisciplinary Research Xidian UniversityXi’an 710071China

Near-infrared Ⅱ(NIR-Ⅱ)fluorescent nanoprobes hold great potential for biomedical *** the relationship between surface properties of NIR-Ⅱ nanoprobes and their biological behaviors is particularly important for future probe design and their performance *** the rapid development of NIR-Ⅱ nanoprobes,the distinct role of surface chirality on their biological fates has rarely been ***,chiral NIR-Ⅱ fluorescent Ag_(2)S quantum dots(QDs)are synthesized to investigate the relationship between their chirality and biological functions at both in vitro and in vivo levels.D-/L-Ag_(2)S QDs exhibit significant differences on their interactions with serum proteins,which further affect the cellular *** a result,D-Ag_(2)S QDs can be internalized with higher efficiency(over 2-fold)than that of L-Ag_(2)S ***,in vivo studies reveal that the chirality determines the primary localization of these chiral QDs,where a more efficient renal elimination of D-Ag_(2)S QDs was observed than that of L-Ag_(2)S ***,D-Ag_(2)S QDs show preferential accumulation in tumor region than that of L-Ag_(2)S QDs in orthotopic kidney tumor model,which points out a new avenue of enhancing targeting capabilities of nanoprobes by engineering their surface chirality.

关键词： Chirality NIR-Ⅱprobes Ag_(2)S quantum dots Protein corona Tumor targeting

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