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Bi_(2)SeO_(5): A single-crystalline van der Waals dielectric beyond h-BN

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Science China Chemistry 2023年第6期66卷 1551-1552页

作者： Kongyang Yi Zheng Liu School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore cintra cnrs/ntu/thales UMI 3288Research Techno PlazaSingapore 637553Singapore

1School of Materials Science and Engineering,Nanyang Technological University,Singapore 639798,Singapore;2cintra cnrs/ntu/thales,UMI 3288,Research Techno Plaza,Singapore 637553,Singapore.

关键词： crystalline Singapore dielectric

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Theoretical study of defect impact on two-dimensional MoS_2

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Journal of Semiconductors 2015年第12期36卷 18-23页

作者： Anna V.Krivosheeva Victor L.Shaposhnikov Victor E.Borisenko Jean-Louis Lazzari Chow Waileong Julia Gusakova Beng Kang Tay Belarusian State University of Informatics and Radioelectronics cnrs Aix-Marseille Université NOVITAS Nanoelectronics Centre of Excellence School of Electrical and Electronic Engineering Nanyang Technological University cintra cnrs NTUTHALES Nanyang Technological University

Our theoretical findings demonstrate for the first time a possibility of band-gap engineering of monolayer MoS2 crystals by oxygen and the presence of vacancies. Oxygen atoms are revealed to substitute sulfur ones, forming stable MoS2-xOx ternary compounds, or adsorb on top of the sulfur atoms. The substituting oxygen provides a decrease of the band gap from 1.86 to 1.64 eV and transforms the material from a direct-gap to an indirect-gap semiconductor. The surface adsorbed oxygen atoms decrease the band gap up to 0.98 eV depending on their location tending to the metallic character of the electron energy bands at a high concentration of the adsorbed atoms. Oxygen plasma processing is proposed as an effective technology for such band-gap modifications.

关键词： two-dimensional crystal molybdenum disulfide band gap vacancy oxygen

Theoretical study of defect impact on two-dimensional MoS

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Journal of Semiconductors 2015年第12期 22-27页

Our theoretical findings demonstrate for the first time a possibility of band-gap engineering of monolayer MoS;crystals by oxygen and the presence of vacancies. Oxygen atoms are revealed to substitute sulfur ones, forming stable MoS;O;ternary compounds, or adsorb on top of the sulfur atoms. The substituting oxygen provides a decrease of the band gap from 1.86 to 1.64 eV and transforms the material from a direct-gap to an indirect-gap semiconductor. The surface adsorbed oxygen atoms decrease the band gap up to 0.98 eV depending on their location tending to the metallic character of the electron energy bands at a high concentration of the adsorbed atoms. Oxygen plasma processing is proposed as an effective technology for such band-gap modifications.

关键词： two-dimensional crystal molybdenum disulfide band gap vacancy oxygen

Quantum super-oscillation of a single photon

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Light(Science & Applications) 2016年第1期5卷 577-582页

作者： Guang Hui Yuan Stefano Vezzoli Charles Altuzarra Edward TF Rogers Christophe Couteau Cesare Soci Nikolay I Zheludev The Photonics Institute Centre for Disruptive Photonic TechnologiesNanyang Technological UniversitySingapore 637371Singapore cintra CNRS-NTU-ThalesCNRS UMI 3288Singapore 637553Singapore Optoelectronics Research Centre and Centre for Photonic Metamaterials University of SouthamptonSouthampton SO171BJUK Institute for Life Sciences University of SouthamptonSouthampton SO171BJUK Laboratory for Nanotechnology Instrumentation and OpticsICD CNRS UMR 6281University of Technology of TroyesTroyes 10000France

Super-oscillation is a counterintuitive phenomenon describing localized fast variations of functions and fields that happen at frequencies higher than the highest Fourier component of their *** physical implications of this effect have been studied in information theory and optics of classical fields,and have been used in super-resolution *** a general phenomenon of wave dynamics,super-oscillations have also been predicted to exist in quantum *** we report the experimental demonstration of super-oscillatory behavior of a single-quantum object,a *** super-oscillatory behavior is demonstrated by tight localization of the photon wavefunction after focusing with an appropriately designed slit mask to create an interference pattern with a sub-diffraction hotspot(~0.45λ).Such quantum super-oscillation can be used for low-intensity far-field super-resolution imaging techniques even down to single-photon counting regime,which would be of interest to quantum physics and non-invasive and label-free biological studies.

关键词： energy backflow single-photon wavefunction super-oscillation super-resolution

Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime

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Light(Science & Applications) 2019年第1期8卷 1099-1107页

作者： Hangyong Shan Ying Yu Xingli Wang Yang Luo Shuai Zu Bowen Du Tianyang Han Bowen Li Yu Li Jiarui Wu Feng Lin Kebin Shi Beng Kang Tay Zheng Liu Xing Zhu Zheyu Fang School of Physics State Key Lab for Mesoscopic Physics/Academy for Advanced Interdisciplinary Studies/Collaborative Innovation Center of Quantum MatterPeking University100871 BeijingChina cnrs International-ntu-thales Research Alliance(cintra) Nanyang Technological UniversitySingapore 637553Singapore Centre for Micro-/Nano-Electronics(NOVITAS) School of Electrical and Electronic Engineering/Centre for Programmed MaterialsSchool of Materials Science and EngineeringNanyang Technological UniversitySingapore 637553Singapore

Achieving strong coupling between plasmonic oscillators can significantly modulate their intrinsic optical ***,we report the direct observation of ultrafast plasmonic hot electron transfer from an Au grating array to an MoS_(2) monolayer in the strong coupling regime between localized surface plasmons(LSPs)and surface plasmon polaritons(SPPs).By means of femtosecond pump-probe spectroscopy,the measured hot electron transfer time is approximately 40 fs with a maximum external quantum yield of 1.65%.Our results suggest that strong coupling between LSPs and SPPs has synergetic effects on the generation of plasmonic hot carriers,where SPPs with a unique nonradiative feature can act as an‘energy recycle bin’to reuse the radiative energy of LSPs and contribute to hot carrier *** energy exchange between plasmonic modes in the strong coupling regime can further enhance the vertical electric field and promote the transfer of hot electrons between the Au grating and the MoS_(2) *** proposed plasmonic strong coupling configuration overcomes the challenge associated with utilizing hot carriers and is instructive in terms of improving the performance of plasmonic opto-electronic devices.

关键词： properties coupling transfer

Dynamic photonic barcodes for molecular detection based on cavity-enhanced energy transfer

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Advanced Photonics 2020年第6期2卷 69-77页

作者： Yunke Zhou Zhiyi Yuan Xuerui Gong Muhammad D.Birowosuto Cuong Dang Yu-Cheng Chen Nanyang Technological University School of Electrical and Electronic EngineeringSingapore cintra UMI cnrs/ntu/thales Singapore Nanyang Technological University School of Chemical and Biomedical EngineeringSingapore

Optical barcodes have demonstrated a great potential in multiplexed bioassays and cell tracking for their distinctive spectral *** vast majority of optical barcodes were designed to identify a specific target by fluorescence emission spectra,without being able to characterize dynamic changes in response to analytes through *** overcome these limitations,the concept of the bioresponsive dynamic photonic barcode was proposed by exploiting interfacial energy transfer between a microdroplet cavity and binding ***-gallery modes resulting from cavity-enhanced energy transfer were therefore converted into photonic barcodes to identify binding activities,in which more than trillions of distinctive barcodes could be generated by a single *** spectral barcoding was achieved by a significant improvement in terms of signal-to-noise ratio upon binding to target *** studies and experiments were conducted to elucidate the effect of different cavity sizes and analyte *** fluorescence lifetime was implemented to investigate the role of radiative and non-radiative energy ***,microdroplet photonic barcodes were employed in biodetection to exhibit great potential in fulfilling biomedical applications.

关键词： whispering-gallery modes optical barcodes fluorescence resonance energy transfer molecular sensing biointerface cavity-enhancement

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Recent progress in the synthesis of novel two-dimensional van der Waals materials

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National Science Review 2022年第5期9卷 57-76页

作者： Renji Bian Changcun Li Qing Liu Guiming Cao Qundong Fu Peng Meng Jiadong Zhou Fucai Liu Zheng Liu School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China School of Electrical and Electronic Engineering Nanyang Technological University cnrs-International-ntu-thales Research Alliance (cintra) Yangtze Delta Region Institute (Huzhou) University of Electronic Science and Technology of China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems and School of Physics Beijing Institute of Technology School of Materials Science and Engineering Nanyang Technological University

The last decade has witnessed the significant progress of physical fundamental research and great success of practical application in two-dimensional(2D) van der Waals(vdW) materials since the discovery of graphene in *** date,vdW materials is still a vibrant and fast-expanding field,where tremendous reports have been published covering topics from cutting-edge quantum technology to urgent green energy,and so ***,we briefly review the emerging hot physical topics and intriguing materials,such as 2D topological materials,piezoelectric materials,ferroelectric materials,magnetic materials and twistronic ***,various vdW material synthetic strategies are discussed in detail,concerning the growth mechanisms,preparation conditions and typical ***,prospects and further opportunities in the booming field of 2D materials are addressed.

关键词： two-dimensional materials synthesis exfoliation chemical vapor deposition

Space-confined microwave synthesis of ternary-layered BiOCl crystals with high-performance ultraviolet photodetection

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InfoMat 2020年第3期2卷 593-600页

作者： Lixing Kang Xuechao Yu Xiaoxu Zhao Qingling Ouyang Jun Di Manzhang Xu Dan Tian Weiliang Gan Calvin CIAng Shoucong Ning Qundong Fu Jiadong Zhou R.G.Kutty Ya Deng Pin Song Qingsheng Zeng Stephen J.Pennycook Jun Shen Ken-T.Yong Zheng Liu School of Materials Science and Engineering Nanyang Technological UniversitySingapore cintra cnrs/ntu/thales Singapore Centre for OptoElectronics and Biophotonics School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore Department of Materials Science and Engineering National University of SingaporeSingapore Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqingChina

In recent years,two-dimensional(2D)ternary materials have attracted wide attention due to their novel properties which can be achieved by regulating their chemical composition with a very great degree of freedom and adjustable ***,as for the precise synthesis of 2D ternary materials,great challenges still lie ahead that hinder their further *** this work,we demonstrated a simple and reliable approach to synthesize 2D ternary-layered BiOCl crystals through a microwave-assisted space-confined process in a short time(<3 minutes).Their ultraviolet(UV)detection performance was analyzed *** photodetectors based on the as-obtained BiOCl platelets demonstrate high sensitivity to 266-nm laser *** responsivity is calculated to be8 A/W and the response time is up to be18 *** the other hand,the device is quite stable after being exposed in the ambient air within 3 weeks and the response is almost unchanged during the *** facile and fast synthesis of single crystalline BiOCl platelets and its high sensitivity to UV light irradiation indicate the potential optoelectronic applications of 2D BiOCl photodetectors.

关键词： 2D materials bismuth oxyhalide microwave synthesis UV photodetector

Recent Progress on 2D Transition Metal Compounds-based Electrocatalysts for Efficient Nitrogen Reduction

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Chemical Research in Chinese Universities 2020年第4期36卷 648-661页

作者： DONG Wcnfei CHEN Xiaoyu PENG Juan LIU Wanyi JIN Xiaoyong NI Gang LIU Zheng State Key Laboratoty of High-efficiency Utilization of Coal and Green Chemical Engineering National Demonstration Center for Experimental Chemistry EducationCollege of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021P.R.China School of Materials Science and Engineeting Nanyang Technological UniversitySingapore 639798Singapore cintra cnrs ntu thales Research Techno PlazaSingapore 639798Singapore Environmental Chemistry and Materials Centre Nanyang Environment and Water Research InstituteSingapore 639798Singapore

Ammonia is a commodity chemical with high added *** reduction of nitrogen has great promise for the sustainable synthesis of ammonia in recent *** of its rich resources and unique electronic structure and characteristics,2D transition metal compounds have been used as electrocatalysts for electro-chemical reduction of nitrogen for clean and sustainable production of ammonia,This review outlines the latest development in the use of 2D transition metal compounds as high-efficiency electrocatalysts for nitrogen ***(NRR).First,we introduce the N,reduction mechanism,and briefly summarize the performance indicators ofthe ***,we focused on the functionalization of unique 2D materials to design high-performance 2D electrocatalysts in respect of simulation calculation and experimental ***,the current challenges and future opportunities for NRR electrocatalvsts are introduced.

关键词： Electrochemical NH3 svnthesis Transition metal Nitrogen fixation Electrocatalysis