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Niobium telluride absorber for a mode-locked vector soliton fiber laser

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Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 130-138页

作者： XinXin Shang NanNan Xu Jia Guo Shuo Sun HuaNian Zhang SWageh Ahmed AAl-Ghamdi Han Zhang DengWang Li Shandong Province Key Laboratory of Medical Physics and Image Processing Technology Shandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250014China Institute of Microscale Optoelectronics Collaborative Innovation Center for Optoelectronic Science&TechnologyKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen Key Laboratory of Micro-Nano Photonic Information TechnologyGuangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)Shenzhen UniversityShenzhen 518060China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255049China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

Niobium telluride(NbTe_(2)),an emerging transition metal dichalcogenide material,has been theoretically predicted to have nonlinear absorption properties and excellent optical response.However,only a few studies of the utilization of NbTe_(2)in ultrafast photonics have been reported.In this work,a NbTe_(2)-based saturable absorber(SA)was applied in an erbium-doped fiber as a mode-locked device,and a vector soliton based on NbTe_(2)was obtained for the first time.NbTe_(2)-PVA film SA was successfully prepared by the liquid-phase exfoliation and spin coating methods,with a modulation depth of up to 10.87%.The nonlinear absorption coefficient of NbTe_(2)-based SA film tested through the open-aperture Z-scan laser measurement is 0.62×10^(−11) m/W.A conventional soliton with a pulse duration of 858 fs was generated using NbTe_(2)-based SA,which was demonstrated to be a kind of polarization-locked vector soliton in further investigation.Our experimental results reveal the nonlinear optical properties of NbTe_(2)and broaden its applications in ultrafast photonic devices.

关键词： niobium telluride saturable absorber mode-locked pulse fiber laser

一种乳酸菌-金属有机框架复合物用于强化肿瘤乏氧光动力和免疫治疗

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Science China Materials 2023年第1期66卷 363-374页

作者：李田忠王金勇陈桐楷 Swelm Wageh Ahmed AAl-Ghamdi 于江天谢中建张晗 Interdisciplinary Center of High Magnetic Field Physics of Shenzhen University College of Physics and Optoelectronic EngineeringDepartment of OtolaryngologyShenzhen Institute of Translational MedicineShenzhen Second People’s Hospitalthe First Affiliated HospitalShenzhen UniversityShenzhen 518060China Shenzhen International Institute for Biomedical Research Shenzhen 518000China Science and Technology Innovation Center Guangzhou University of Chinese MedicineGuangzhou 510405China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Institute of Pediatrics Shenzhen Children’s HospitalShenzhen 518038China

开发长期有效的癌症治疗技术仍然是科研工作者和临床医生面临的重要任务.厌氧型乳酸菌(LAB)具有天然的乏氧倾向性,可自发富集在缺氧的肿瘤微环境中.金属有机框架(MOF)是一类独特的纳米材料,其中的ZIF-67可以自发分解过氧化氢产氧,且析... 详细信息

开发长期有效的癌症治疗技术仍然是科研工作者和临床医生面临的重要任务.厌氧型乳酸菌(LAB)具有天然的乏氧倾向性,可自发富集在缺氧的肿瘤微环境中.金属有机框架(MOF)是一类独特的纳米材料,其中的ZIF-67可以自发分解过氧化氢产氧,且析氧能力可被光照增强.然而,LAB或MOF单独应用于肿瘤治疗的效果并不令人满意.在本文中,我们制备了一种MOF修饰的乳酸菌制剂,用以在缺氧性肿瘤中局部产生活性氧(ROS)助力光动力治疗,同时精准诱导宿主肿瘤免疫.这些细菌表面被ZIF-67纳米材料修饰(LAB@ZIF-67),经体内循环后富集在肿瘤微环境中.细菌表面的ZIF-67可以被CT-26细胞吸收,并且在光照后检测到细胞内快速生成ROS.体内实验表明,该细菌复合物可通过光动力疗法消灭肿瘤,同时诱导肿瘤特异的炎性反应,招募巨噬细胞和T细胞实现肿瘤的免疫治疗.此类材料-细菌复合物为今后研发肿瘤主动靶向药物和癌症免疫疗法提供了新思路.

关键词：肿瘤微环境金属有机框架光动力免疫治疗肿瘤免疫缺氧性巨噬细胞厌氧型

钙钛矿太阳能电池中CsPbBr3纳米晶界面修饰剂的作用机制

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物理化学学报 2022年第7期38卷 1-3页

作者： S.Wageh ahmed A.Al-ghamdi 赵丽 Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia 湖北大学材料科学与工程学院功能材料绿色制备与应用教育部重点实验室有机化工新材料湖北省协同创新中心武汉430062

During the past decade,organic-inorganic hybrid perovskite solar cell(PSC)has attracted great attention in the photovoltaic field 1,2.As the third-generation solar cell,PSC in laboratory has already achieved certified power conversion efficiency(PCE)exceeding 25%.The superb photovoltaic performance of PSC is attributed to the unique optoelectronic properties of organic-inorganic halide perovskite light absorption layer,including low exciton binding energy,high absorption coefficients,and outstanding carrier mobility 3,4.Hence,the quality of perovskite film plays a decisive role in the photovoltaic performance of PSC.Defects are inevitably formed on the surface and inside of polycrystalline perovskite film during the conventional preparation methods.It’s widely acknowledged that defects are the recombination centers of photogenerated electrons and holes,resulting in the loss of useful photogenerated charges 5,6.Therefore,decreasing the charge loss is advantageous to improving the PCE of PSC.

关键词：钙钛矿太阳能电池界面修饰 perovskite

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利用飞秒技术研究电荷转移动力学

Chinese Journal of Catalysis 2023年第6期49卷 5-7页

作者：朱君江 S.Wageh ahmed A.Al-ghamdi 武汉纺织大学化学与化工学院生物质纤维与生态染整湖北省重点实验室湖北武汉430200 阿卜杜勒阿齐兹国王大学理学院物理系沙特阿拉伯吉达

光催化材料和技术可合理利用太阳能,完成能量转化与存储,并实现环境治理和双碳目标.光催化剂活性是影响其效率的关键,因此光催化剂的合理设计成为研究热点.为抑制光生电子和空穴的快速复合并拓展单一光催化剂的光吸收范围,可通过构建异... 详细信息

光催化材料和技术可合理利用太阳能,完成能量转化与存储,并实现环境治理和双碳目标.光催化剂活性是影响其效率的关键,因此光催化剂的合理设计成为研究热点.为抑制光生电子和空穴的快速复合并拓展单一光催化剂的光吸收范围,可通过构建异质结特别是新兴的梯型(S型异质结)的策略.在保有体系最大氧化还原能力的同时,实现光生电荷的有效分离.可通过原位光照X射线光电子能谱和原位光照原子力显微镜等技术研究梯型异质结的电荷转移机制,然而,目前尚缺少对于异质结界面处瞬态动力学的深入研究.近期,中国地质大学(武汉)余家国教授、张留洋教授与湖北文理学院梁桂杰教授合作,通过原位生长策略,在芘基共轭聚合物(PDB)表面原位生长硫化镉(Cd S)纳米晶体,制备了一系列硫化镉/聚合物梯型异质结(CPDB),并系统地研究了异质结界面处的稳态电荷分布以及瞬态电荷转移动力学.密度泛函理论计算和开尔文探针测试结果表明,暗态下电子由PDB向Cd S转移,并在界面处形成内建电场和能带弯曲.原位光照X射线光电子能谱表明,在内建电场和能带弯曲的驱动下,Cd S的光生电子与PDB的光生空穴复合,而PDB的光生电子与Cd S的光生空穴得以保留.利用飞秒瞬态吸收技术揭示了异质结界面处的电荷转移演化过程.通过实验信号的拟合分析,Cd S的光生电子有三条衰减路径:晶格间的电子扩散、光生电子空穴对直接复合以及光生电子与捕获态空穴复合.对于CPDB复合物而言,除了上述三种衰减路径,还发现Cd S的光生电子与PDB的光生空穴复合路径.作者通过调控Cd S/PDB配比,阐述了异质结界面电荷转移过程动力学与其光催化性能的关系.结果表明,随着PDB含量的增加,Cd S与PDB之间界面电荷转移寿命越短(速度越快);然而,加入过量PDB会导致聚合物发生聚集,从而抑制界面电荷转移.该结论与CPDB复合物的光催化性能表现一致.综上,该工作通过使用飞秒瞬态吸收技术,对梯型异质结光催化剂的界面电荷转移过程进行了直接跟踪观测,为揭示光催化过程中的复杂机制提供了新思路.

关键词：光催化飞秒瞬态吸收梯型异质结硫化镉共轭聚合物

Design principle of S-scheme heterojunction photocatalyst

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Journal of Materials Science & Technology 2022年第29期124卷 171-173页

作者： Quanlong Xu S.Wageh ahmed A.Al-ghamdi Xin Li Key laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou325027China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou510642China

Recently,a new opinion was put forward on general design standards for S-scheme heterojunction photocatalyst.Four types of S-scheme heterojunctions were analyzed.Specifically,the critical understanding on the curved Fermi level at the interface of S-scheme heterojunction is helpful to strengthen and promote the basic theory of photocatalysis.

关键词： S-scheme heterojunction p-type semiconductor n-type semiconductor Curved Fermi level

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光催化杀菌和诱导骨组织生长

Chinese Journal of Catalysis 2021年第7期42卷 1051-1053页

作者： s.wageh ahmed A.Al-ghamdi 刘丽君阿卜杜勒阿齐兹国王大学理学院物理系沙特阿拉伯吉达21589 武汉纺织大学化学与化工学院中国湖北武汉430200

钛合金植入体具有良好的生物相容性和化学稳定性,广泛应用于整形外科手术.植入手术细菌感染风险较高,若处理不当,易造成患者骨组织损失甚至截肢.光催化杀菌是光催化领域研究热点之一,光催化剂表面产生的活性氧物种(ROS)氧化能力强,可有... 详细信息

钛合金植入体具有良好的生物相容性和化学稳定性,广泛应用于整形外科手术.植入手术细菌感染风险较高,若处理不当,易造成患者骨组织损失甚至截肢.光催化杀菌是光催化领域研究热点之一,光催化剂表面产生的活性氧物种(ROS)氧化能力强,可有效杀灭细菌.制备生物相容性好且光催化活性高的植入体,利用光催化技术,可实现术后植入体表面自主产生抗菌活性,同时诱导骨组织细胞原位生长和成骨.二氧化钛(TiO_(2))光催化剂化学稳定性好,原料易得,具有一定的生物相容性,但其光生电子与空穴易复合,光催化抗菌活性弱.石墨炔(GDY)是新兴的电子助催化剂,具有独特的sp和sp2杂化碳原子,可以捕获TiO2的光生电子,促进光生电子/空穴分离和ROS生成.基于此,张玉峰教授(武汉大学)和余家国教授(武汉理工大学)近期报道了一种新型的具有光催化生物活性的TiO2/GDY复合植入体(Nat.Commun.,2020,11,4465).它由带正电的TiO2纳米纤维和带负电的GDY纳米片通过静电自组装而成.在紫外光照射下,TiO2/GDY植入体能够产生羟基自由基(•OH),超氧阴离子(•O^(2‒))和过氧化氢(H_(2)O_(2))等活性氧物种.原位生成的活性氧物种具有较强的氧化能力,可以破坏抗药性金黄色葡萄球菌(MRSA)的生物膜,还能抑制MRSA新细菌生物膜的形成和代谢.光照生成的H_(2)O_(2)具有持续缓释特性,在紫外光移除后,TiO_(2)/GDY植入体仍显示出长期的抗菌活性.此外,TiO_(2)/GDY具有良好的生物相容性和亲水性,有效吸附小鼠成骨细胞并诱导产生骨骼分化所需的蛋白质和酶,表明TiO_(2)/GDY纳米纤维具有良好的诱导骨组织生长能力.该工作创新性地将光催化技术应用于骨科植入体,提出了植入体原位光催化杀菌和诱导骨组织生长的新思路,实现了材料学和医学的交叉融合,为开发其他高效植骨材料提供了有益借鉴.

关键词：石墨炔活性氧物种抗菌性诱导骨组织生长生物相容性

核壳Au@NiS;助催化剂实现高效TiO;光催化制氢（英文）

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物理化学学报 2022年

作者： Swelm Wageh ahmed A.Al-ghamdi 徐全龙 Department of Physics， Faculty of Science， King Abdulaziz University 温州大学化学与材料工程学院，浙江省碳材料技术研究重点实验室

The convertion of solar energy into hydrogen energy with high energy density by photocatalysis is a green and eco-friendly avenue to solve the energy crisis and environmental pollution issues;. Unfortunately， most photocatalysts usually suffer from the rapid quenching of photogenerated carriers and depressed interfacial H;-generation dynamics;.

关键词：

Silica Nanoparticles with Virus-Mimetic Spikes Enable Efficient siRNA Delivery In Vitro and In Vivo

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Research 2023年第3期2022卷 281-294页

作者： Jianye Fu Wenwei Han Xue Zhang Yutong Sun Rajendra Bhadane Bo Wei Li Li Liangmin Yu Jinbo Yang Jessica MRosenholm Outi MHSalo-Ahen Taojian Fan Bin Zhang Wageh Swelm Ahmed AAl-Ghamdi Lin Xia Han Zhang Meng Qiu Hongbo Zhang Xin Wang Key Laboratory of Marine Drugs Chinese Ministry of EducationSchool of Medicine and PharmacyOcean University of ChinaQingdao 266003China Collaborative Innovation Center for Optoelectronic Science&Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Marine Chemistry Theory and Technology(Ocean University of China) Ministry of EducationQingdao 266100China College of Chemistry and Chemical Engineering China University of PetroleumQingdao 266555China. Pharmaceutical Sciences Laboratory Åbo Akademi University20520 TurkuFinland Structural Bioinformatics Laboratory BiochemistryÅbo Akademi University20520 TurkuFinland. Center for Innovation Marine Drug Screening&Evaluation Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Marine Biomedical Research Institute of Qingdao Qingdao 266100China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Hangzhou No.14 High School Hangzhou 310000China Turku Bioscience Centre University of Turku andÅbo Akademi University20520 TurkuFinland

Oligonucleotide-based therapy has experienced remarkable development in the past 2 decades,but its broad applications are severely hampered by delivery vectors.Widely used viral vectors and lipid nanovectors are suffering from immune clearance after repeating usage or requiring refrigerated transportation and storage,respectively.In this work,amino-modified virus-mimetic spike silica nanoparticles(NH_(2)-SSNs)were fabricated using a 1-pot surfactant-free approach with controlled spike lengths,which were demonstrated with excellent delivery performance and biosafety in nearly all cell types and mice.It indicated that NH2-SSNs entered cells by spike-dependent cell membrane docking and dynamin-dependent endocytosis.The positively charged spikes with proper length on the surface can facilitate the efficient encapsulation of RNAs,protect the loaded RNAs from degradation,and trigger an early endosome escape during intracellular trafficking,similarly to the cellular internalization mechanism of virions.Regarding the fantastic properties of NH_(2)-SSNs in nucleic acid delivery,it revealed that nanoparticles with solid spikes on the surface would be excellent vehicles for gene therapy,presenting self-evident advantages in storage,transportation,modification,and quality control in large-scale production compared to lipid nanovectors.

关键词： surfactant loaded transportation

S-scheme ZnO/WO3 heterojunction photocatalyst for efficient H2O2 production

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Journal of Materials Science & Technology 2022年第29期124卷 193-201页

作者： Zicong Jiang Bei Cheng Yong Zhang S.Wageh ahmed A.Al-ghamdi Jiaguo Yu Linxi Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

Designing highly efficient photocatalyst for hydrogen peroxide(HO)production is an ideal strategy to avoid the shortcomings of traditional HOproduction and to realize the conversion of solar energy to chemical energy.In this work,a step-scheme(S-scheme)heterojunction photocatalyst composed of Zn O and WOis carefully prepared by hydrothermal and calcination method for efficient photocatalytic HOproduction.The ZW30 composite photocatalysts exhibit enhanced activity with the highest HO-production rate of 6788μmol Lh.The results show that the photocatalytic HOproduction process is dominated by a direct two-electron Oreduction pathway.The enhanced photocatalytic HO-production activity is attributed to the formation of interfacial internal electric field(IEF)in the S-scheme heterojunction,which boosts the spatial separation of charge carriers and enables electrons with the strongest reduction power to participate in HOproduction.This work provides an in-depth insight of the great advantages of S-scheme heterojunction in photocatalytic HOproduction.

关键词： Photocatalysis Hydrogen peroxide Step-scheme heterojunction O2 reduction Zinc oxide