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Interlayer sensitized van der Waals heterojunction photodetector with enhanced performance

Nano Research 2023年第7期16卷 10537-10544页

作者： Huide Wang Yonghong Zeng FanXu Meng Rui Cao Yi Liu Zhinan Guo Tingting Wang Haiguo Hu Sidi Fan Yatao Yang SWageh omar aal-hartomy Abul Kalam Yonghong Shao Yu-Jia Zeng Dianyuan Fan Han Zhang International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Institute of Microscale OptoelectronicsInterdisciplinary Center of High Magnetic Field Physics of Shenzhen UniversityCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Guangzhou Key Laboratory of Sensing Materials and Devices Center for Advanced Analytical ScienceSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Center of Characterization and Analysis Jilin Institute of Chemical TechnologyJilin 132022China School of Mathematical&Physical Sciences Wuhan Textile UniversityWuhan 430200China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Research Center for Advanced Materials Science(RCAMS) King Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia Department of Chemistry College of ScienceKing Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia

Although photodetection based on two-dimensional(2D)van der Waals(vdWs)P-N heterojunction has attracted extensive attention recently,their low responsivity(R)due to the lack of carrier gain mechanism in reverse bias or zero bias operation hinders their applications in advanced photodetection ***,a black phosphorus/rhodamine 6G/molybdenum disulfide(BP/R6G/MoS_(2))photodiode with high responsivity at reverse bias or zero bias has been achieved by using interfacial charge transfer of R6G molecules assembled between heterojunction *** formed vdWs interface achieves high performance photoresponse by efficiently separating the additional photogenerated electrons and holes generated by R6G *** devices sensitized by the dye molecule R6G exhibit enhanced photodetection performance without sacrificing the photoresponse *** them,the R increased by 14.8-20.4 times,and the specific detectivity(D^(*))increased by 24.9-34.4 *** strategy based on interlayer assembly of dye molecules proposed here may pave a new way for realizing high-performance photodetection based on 2D vdWs heterojunctions with high responsivity and fast response speed.

关键词： heterojunction photodetector interlayer sensitization charge transfer responsivity

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Early and Sensitive Detection of Pathogens for Public Health and Biosafety:An Example of Surveillance and Genotyping of SARS-CoV-2 in Sewage Water by Cas12a-Facilitated Portable Plasmonic Biosensor

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Research 2024年第2期2023卷 259-272页

作者： Tianzhong Li Yuzhi Chen Zhi Chen Yuan Hao Minyi Liang Yingxia Liu Guanyong Ou Huanian Zhang Yuxuan Tang Yabing Hao Swelm Wageh omar aal-hartomy Abul Kalam Bin Zhang Xin Shi Xuejin Li Han Zhang College of Physics and Optoelectronic Engineering Institute of Translational MedicineDepartment of OtolaryngologyShenzhen Second People's HospitalFirst Affiliated Hospital of Shenzhen UniversityHealth Science CenterShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Sensor Technology Shenzhen 518060China The Sixth Affiliated Hospital of Guangzhou Medical University Qingyuan People's HospitalQingyuan 511518China Shenzhen Key Laboratory of Pathogen and Immunity National Clinical Research Center for Infectious DiseaseState Key Discipline of Infectious DiseaseShenzhen Third People's HospitalSecond Hospital Affiliated to Southern University of Science and TechnologyShenzhen 518112China School of Medicine Southern University of Science and TechnologyShenzhen 518055China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255049China Department of Physics Faculty of ScienceKing Abdulaziz University Jeddah 21589Saudi Arabia Research Center for Advanced Materials Science(RCAMS) King Khalid UniversityP.0.Box 9004Abha 61413Saudi Arabia Department of Chemistry College of ScienceKing Khalid UniversityP.0.Box9004Abha 61413 Saudi Arabia Health Sciences Institute China Medical UniversityShenyang 110000China The Chinese University of Hong Kong Shenzhen 518060China

Infectious diseases severely threaten public health and global *** addition to transmission through the air,pathogenic microorganisms have also been detected in environmental liquid samples,such as sewage *** biochemical detection methodologies are time-consuming and cost-ineffective,and their detection limits hinder early *** the present study,ultrafine plasmonic fiber probes with a diameter of 125μm are fabricated for clustered regularly interspaced short palindromic repeats/CRISPR-associated protein(CRISPR/Cas)-12a-mediated sensing of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).Single-stranded DNA exposed on the fiber surface is trans-cleaved by the Cas12a enzyme to release gold nanoparticles that are immobilized onto the fiber surface,causing a sharp reduction in the surface plasmon resonance(SPR)*** proposed fiber probe is virus-specific with the limit of detection of~2,300 copies/ml,and genomic copy numbers can be reflected as shifts in wavelengths.A total of 21 sewage water samples have been examined,and the data obtained are consistent with those of quantitative polymerase chain reaction(qPCR).In addition,the Omicron variant and its mutation sites have been fast detected using S gene-specific *** study provides an accurate and convenient approach for the real-time surveillance of microbial contamination in sewage water.

关键词： fiber consuming hinder

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CRISPR-Cas12a-Empowered Electrochemical Biosensor for Rapid and Ultrasensitive Detection of SARS-CoV-2 Delta Variant

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Nano-Micro Letters 2022年第10期14卷 83-94页

作者： Chenshuo Wu Zhi Chen Chaozhou Li Yabin Hao Yuxuan Tang Yuxuan Yuan Luxiao Chai Taojian Fan Jiangtian Yu Xiaopeng Ma omar aal-hartomy SWageh Abdullah GAl-Sehemi Zhiguang Luo Yaqing He Jingfeng Li Zhongjian Xie Han Zhang International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Shenzhen International Institute for Biomedical Research Shenzhen 518116People’s Republic of China Department of Respiratory Shenzhen Children’s HospitalShenzhen 518038People’s Republic of China Institute of Pediatrics Shenzhen Children’s HospitalShenzhen 518038People’s Republic of China Shenzhen Han’s Tech Limited Company Shenzhen 518000People’s Republic of China Hospital of Guangzhou Medical University Qingyuan city People’s HospitalQingyuan 511518People’s Republic of China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Research Center for Advanced Materials Science(RCAMS) King Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia Department of Chemistry College of ScienceKing Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia Zhongmin(Shenzhen)Intelligent Ecology Co. LtdShenzhen 518055People’s Republic of China Shenzhen Center for Disease Control and Prevention Shenzhen 518055People’s Republic of China

Coronavirus disease 2019(COVID-19)is a highly contagious disease caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).The gold standard method for the diagnosis of SARS-CoV-2 depends on quantitative reverse transcription-polymerase chain reaction till now,which is time-consuming and requires expensive instrumentation,and the confirmation of variants relies on further sequencing ***,we first proposed a robust technique-methodology of electrochemical CRISPR sensing with the advantages of rapid,highly sensitivity and specificity for the detection of SARS-CoV-2 *** enhance the sensing capability,gold electrodes are uniformly decorated with electro-deposited gold *** DNA template identical to SARS-CoV-2 Delta spike gene sequence as model,our biosensor exhibits excellent analytical detection limit(50 fM)and high linearity(R2=0.987)over six orders of magnitude dynamic range from 100 fM to 10 nM without any nucleic-acid-amplification *** detection can be completed within 1 h with high stability and specificity which benefits from the CRISPR-Cas ***,based on the wireless micro-electrochemical platform,the proposed biosensor reveals promising application ability in point-of-care testing.

关键词： SARS-COV-2 variant Methodology of electrochemical CRISPR sensing(MOECS) Gold nanoparticles(AuNPs) Point-of-care testing(POCT)

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Ionized cocatalyst to promote CO_(2) photoreduction activity over core-triple-shell ZnO hollow spheres

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Rare Metals 2022年第4期41卷 1077-1079页

作者： Swelm Wageh omar A.Al-hartomy Maged F.Alotaibi Li-Jun Liu Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia College of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhan430200China

Solar-driven CO_(2) conversion into value-added chemicals is a sustainable solution to achieve carbon ***’s group have recently reported Mn,C-codoped ZnO coretriple-shell hollow spheres(CTSHSs)for efficient CO_(2) **... 详细信息

关键词： reduction spheres catalyst

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Au/MXene based ultrafast all-optical switching

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Frontiers of physics 2023年第3期18卷 147-153页

作者： Yule Zhang Feng Zhang Bowen Du Hualong Chen S.Wageh omar A.Al-hartomy Abdullah G.Al-Sehemi Bin Zhang Han Zhang International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics and Translational MedicineThe First Affiliated Hospital(Shenzhen Second People’s Hospital)College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Research Center for Advanced Materials Science(RCAMS) King Khalid UniversityP.O.Box 9004Ab-ha61413Saudi Arabia

All-optical switches have arisen great attention due to their ultrafast speed as compared with electric ***,the excellent optical properties and strong interaction of two-dimensional(2D)material MXene show great potentials in next-generation all-optical *** a solution,we propose all-optical switching used Au/MXene with switching full width at half maximum(FWHM)operating at 290 *** with pure MXene,the Au/MXene behaves outstanding performances due to local surface plasmon resonance(LSPR),including broadband differential transmission,strong near-infrared on/off ratio ***,this study enhances understanding of Au/MXene based ultrafast all-optical switching red-shifted about 34 nm in comparison to MXene,validating all optical properties of Au/MXene opening the way to the implementation of optical interconnection and optical switching.

关键词： Au/MXene ultrafast all-optical switching Au/MXene carrier lifetime

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Application of solvent evaporation technique for pure drug crystal spheres preparation

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Particuology 2022年第8期20卷 79-89页

作者： omar Mady Department of Pharmaceutical Technology Faculty of Pharmacy Tanta UniversityEgypt

An innovative application ofthe solventevaporation technique was *** tech nique is a technique for drug encapsulation and nanosphere *** widely used technique is also facing the problem of low actual drug entrapment percent,which is not economic from the industrial *** goal of this work is trying to use the advantage of this technique concerning the product sphericity and the ability to control particle size,to prepare a drug as pure crystals *** is selected as a model *** spheres are formed by using Polyvinyl pyrrolidone(PVP)or Polyethylene glycol(PEG)as an anti-aggregating agent but not formed on using tween or *** size and actual drug content depend on the concentrations the anti-aggregating agent *** of the drug crystal spheres are porous with empty sphere internal structure on using PvP but spongy and rough on using *** drug has its identity chemical form in the drug crystal *** scan of spheres prepared on using PEG showed a characteristic ether *** showed melting endothermic peak of PEG,but X-ray showed minor change in the drug crystal *** release profiles from crystal spheres prepared with the same anti-aggregating agent are close to each *** drug release profiles from drug crystal spheres prepared by using PEG are more controlled than that prepared by using *** drug release mechanism is *** was concluded that,the same technique could be suggested for preparation ofother biomedical material in pure crystals spheres with controlled particle *** properties may encourage to prepare very small particles with spherical shape for inhalation or injection as an innovative particle technology application for the widely used technique.

关键词： Solvent evaporation technique Drug crystal spheres Ibuprofen Polyvinyl pyrrolidone Polyethylene glycol

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Monolayer MoS_(2)/n-Si Heterostructure Schottky Solar Cell

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Journal of Renewable Materials 2022年第7期10卷 1979-1988页

作者： omar Salih omar The University of Duhok College of ScienceDepartment of PhysicsDuhokKurdistan RegionIraq

Monolayer MoS_(2)has a promising optoelectronics property,with a bandgap in the visible range;the material is a potential candidate for solar cell *** this work,we grew MoS_(2)monolayers using a low-pressure chemical vapor deposition *** produce uniform wafer-scale MoS_(2)monolayer films,precursors molybdenum dioxide(MoO_(2))and sulfur(S)are *** force microscopy was used to quantify the thickness of the monolayers,and the result was validated by Raman *** electron microscopy(TEM)was used to confirm the crystalline quality of the monolayers,and photoluminescence spectroscopy was used to evaluate their optical *** were able to create a Schottky solar cell with a MoS_(2)monolayer up to 1 cm2 area by transferring monolayer film to n-type *** MoS_(2)/n-Si Schottky solar cell demonstrated photovoltaic characteristics with a short circuit current density of 14.8 mA cm^(-2)and an open-circuit voltage of 0.32 V under 100 mW cm^(-2)*** fill factor and energy conversion efficiency were 53%and 2.46%,respectively,with the highest external quantum efficiency at 530 nm being 44%.

关键词： MoS_(2)monolayers chemical vapor deposition Schottky solar cell

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CdS/polymer S‐scheme H_(2)‐production photocatalyst and its in‐situ irradiated electron transfer mechanism

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Chinese Journal of Catalysis 2022年第3期43卷 586-588页

作者： S.Wageh Ahmed A.Al‐Ghamdi omar A.Al‐hartomy Maged F.Alotaibi Linxi Wang King Abdulaziz University Saudi Arabia China University of Geosciences China

Hydrogen(H_(2))is a clean,efficient,and renewable energy with zero carbon emission,which is expected to replace the extensively used fossil *** water splitting is a promising strategy for sustainable H2 ***,the performance of single‐component photocatalysts is often confined by fast electron‐hole recombination due to strong Coulombic force,and their inability to simultaneously attain a wide absorption range and enough redox *** problems can be addressed by constructing a heterojunction between two semiconductors with different Fermi levels(EF),conduction band(CB)and valence band(VB)*** promotes light harvesting through light absorption on both semiconductors and facilitates charge separation by decoupling them on different *** are mainly three types of heterojunctions,namely the type‐II heterojunction,the Z‐scheme heterojunction,and the step‐scheme(S‐scheme)heterojunction[1–3].In a type‐II heterojunction,photogenerated electrons migrate from the higher CB to the lower one,while photogenerated holes transfer from the lower to the higher ***,this schematic is thermodynamically flawed since the charge transfer discounts the redox powers of the electrons and *** transfer is also dynamically unfavorable due to strong repulsion between the photogenerated electrons(or holes)in different *** Z‐scheme heterojunction utilizes dissolved redox ion pairs(traditional Z‐scheme)or conductive materials(all‐solid‐state Z‐scheme)as the shuttle for charge transfer and ***,the photogenerated carriers with stronger redox powers would preferentially react with the ion pairs or combine at the conductor because of stronger driving forces,leading to deducted redox powers and reduced photocatalytic activity.S‐scheme heterojunction could avoid these drawbacks and has exhibited excellent performance in organics degradation[4,5],CO_(2) reduction[6,7],hydrogen evolution[8],

关键词： S型异质结电子转移机理开尔文探针表面电势图像原位光照X射线光电子能谱

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Geochemistry of island arc assemblage in the Eastern Desert of Egypt and the role of Pan-African magmatism in crustal growth of the Arabian–Nubian Shield:A review

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Acta Geochimica 2024年第3期43卷 588-622页

作者： Abdel-aal MAbdel-Karim Mohamed MHamdy Adel A.Surour Geology Department Faculty of ScienceZagazig UniversityZagazig 44519Egypt Geology Department Faculty of ScienceTanta UniversityTanta 31527Egypt Department of Geological Sciences Faculty of ScienceNew Galala City 43511Egypt Geology Department Faculty of ScienceCairo UniversityGiza 12613Egypt

Neoproterozoic island arc assemblage of the Arabian–Nubian Shield(ANS)in the Eastern Desert(ED)of Egypt comprises juvenile suites of metavolcanics(MV),large amounts of meta-sedimentary rocks(MS),and voluminous metagabbros-diorites(MGD)and syn-tectonic intrusions of older granitoids(OG).We report here the updates of these four rock units in terms of classification,distribution,chemical characteristics,geodynamic evolution,metamorphism,and *** addition,we discuss these integrated data to elucidate a reasonable and reliable model for crustal evolution in the *** main features of these rock units indicate their relation to each other and the geodynamic environment dominated by early immature oceanic island arcs to primitive continental *** information of the island arc metavolcanic and plutonic rocks(gabbros,diorites,tonalites,and granodiorites)furnish evidence of the genetic *** include proximity and a coeval nature in the field;all protolith magmas are subalkaline in nature following calc-alkaline series with minor tholeiitic affinities;common geochemical signature of the arc rocks and subduction-related magmatism;their similar enrichment in LREEs;and similar major element compositions with mafic melts derived from metasomatized mantle *** volcano-sedimentary and the OG rocks underwent multiphase deformation events whereas the MGD complexes deformed *** on the magmatic,sedimentological,and metamorphic evolutions constrained by geochronological data as well as the progressive evolutionary trend from extensional to compressional regimes,a possible gradual decrease in the subducted slab dip angle is the most infl uential in any geodynamic model for arc assemblage in the ED of Egypt.

关键词： Island arc assemblage Magmatism Crustal growth Neoproterozoic Arabian–Nubian Shield Eastern Desert Egypt

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VISCOMETRIC INVESTIGATIONS OF POLYVINYLPYRROLIDONE IN MIXED SOLVENTS AND WITH VARYING TEMPERATURE

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Chinese Journal of Polymer Science 2005年第4期23卷 367-371页

作者： omar Melad omar Abu-Tiem Rajai Baraka Chemistry Department

The viscosity behavior of polyvinylpyrrolidone(PVP)has been determined at 25℃ in mixed solvents comprising water/dimethylformamide(DMF)and water/methanol(MeOH).Analysis of the data has considered the PVP as being both host and guest polymer in *** intrinsic viscosity of PVP in DMF is higher than in water and in MeOH,but also increases in a mixed solvent with high water content because of the effect of polymer-solvent *** was also found that the intrinsic viscosity of PVP at finite concentration,[η_(pvp)]_c decreases with an increase in the concentration of PVP in *** viscosity behavior of PVP in a mixed solvent is affected by the concentration-dependent intermolecular excluded volume effect,which can be quantitatively expressed by the parameter,b_Y,which reflects the shrinkage of PVP chain coils,resulting in a decrease of[η_(pvp)]_*** effect of temperature on the viscosity behavior of PVP in MeOH shows that the interaction parameter increases up to a maximum value,and then decreases after a certain temperature.

关键词： Polyvinylpyrrolidone Intermolecular excluded volume effect Intrinsic viscosity

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