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Laser irradiation induced spectral evolution of the surface-enhanced Raman scattering(SERS) of 4-tert-butylbenzylmercaptan on gold nanoparticles assembly

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Science China Chemistry 2007年第4期50卷 520-525页

作者： tong lianming ZHU Tao LIU ZhongFan Center for Nanoscale Science and Technology College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The spectral evolution of the surface-enhanced Raman scattering (SERS) of 4-tert-butylbenzylmer-captan (4-tBBM) on gold nanoparticles assembly under laser irradiation is reported. The relative intensities of typical peaks in the spectrum of 4-tBBM gradually change with irradiation time. Comparison of the rate of spectral changes under several experimental conditions indicates that the surface plasmon resonance (SPR) induced heat in the gold nanoparticles assembly is the origin of the spectral evolution. During the process of self-assembly, 4-tBBM molecules do not form a compact ordered monolayer because of the spatial hindrance of the 4-tert-butyl end group. The heat induced by laser irradiation drives the 4-tBBM molecules to rearrange to a more stable orientation.

关键词： surface-enhanced Raman scattering(SERS) spectral evolution surface plasmon resonance(SRP) thermal effect

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The helicity of Raman scattered light:principles and applications in two-dimensional materials

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Science China Chemistry 2022年第2期65卷 269-283页

作者： Yan Zhao Bo Xu lianming tong Jin Zhang Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China College of Chemistry and Molecular Engineering Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871China

Raman spectroscopy has been not only a technique for characterizing the composition and lattice structure of materials,but also a platform to explore the electron-photon and electron-phonon *** excited by circularly polarized light,the Raman scattered light can carry a spin angular momentum±h,which adds a new degree of freedom to study the Raman scattering *** review explains the principles of the helicity of Raman scattered light excited by circular polarization,and introduces the recent advances in the fundamentals and applications of helicity-resolved Raman scattering in two dimensional(2 D)materials,including the assignment of overlapped Raman modes,the characterization of exciton-phonon coupling and the application in chiral *** hope that this review will give a comprehensive understanding of the helicity selection rule in the Raman scattering process and inspire more exploration on the applications of the helicity of Raman scattered light.

关键词： Raman scattering helicity two-dimensional materials chiral phonon electron-phonon coupling

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New progress of plasmonics in complex metal nanostructures

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Science China(Physics,Mechanics & Astronomy) 2013年第12期56卷 2327-2336页

作者： TIAN XiaoRui tong lianming XU HongXing Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

Noble metal nanostructures possess novel optical properties because of their collective electronic oscillations, known as sur- face plasmons （SPs）. The resonance of SPs strongly depends on the material, surrounding environment, as well as the geome- try of the nanostructures. Complex metal nanostructures have attracted research interest because of the degree of freedom in tailoring the plasmonic properties for more advanced applications that are unattainable by simple ones. In this review, we dis- cuss the plasmonic properties of several typical types of complex metal nanostructures, that is, electromagnefically coupled nanoparticles （NPs）, NPs/metal films, NPs/nanowires （NWs）, NWs/NWs, and metal nanostructures supported or coated by di- electrics. The electromagnetic field enhancement and surface-enhanced Raman scattering applications are mainly discussed in the NPs systems where localized SPs have a key role. Propagating surface plasmon polaritons and relevant applications in plasmonic routers and logic gates using NWs network are also reviewed. The effect of dielectric substrates and surroundings of metal nanostructures to the plasmonic properties is also discussed.

关键词： surface plasmons complex metal nanostructures SERS plasmonic router logic gates Fano resonance

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Abnormal intensity and polarization of Raman scattered light at edges of layered MoS_(2)

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Nano Research 2022年第7期15卷 6416-6421页

作者： Yan Zhao Liheng Zheng Shiyi Han Bo Xu Zheyu Fang Jin Zhang lianming tong Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China College of Chemistry and Molecular Engineering Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871China School of Physics State Key Lab for Mesoscopic PhysicsCollaborative Innovation Center of Quantum Matterand Nano-optoelectronics Frontier Center of Ministry of EducationPeking UniversityBeijing 100871China

The edges of two-dimensional(2D)materials can exhibit special structure and thus distinctive properties differing from the interior,such as the modified photoluminescence emission,the improved electrocatalytic activity,and the enhanced nonlinear optical *** this work,we report the observation of abrupt enhancement of Raman scattered light at edges of layered MoS_(2),which is closely related to the polarization of the incident *** importantly,the intensity of out-of-plane A1g mode is enhanced much more obviously than the in-plane E_(2g)^(1)*** unique optical effect at edges is also reflected on the alteration of Raman selection *** forbidden Raman modes are observed at edge region,and the polarization of Raman scattered light can be modulated by the edge structure,which differs obviously from that of the *** attribute these particular performances to the modulation of the intensity and distribution of the electric field for the incident and Raman scattered light at the *** work provides a systematic research on the intensity and polarization modulation of the Raman scattering at edges,which would be helpful for understanding the distinctive optical properties of the edge structure.

关键词： Raman scattering polarization state edges MoS_(2) Raman selection rule

Tuning bandstructure of folded MoS_(2) through fluid dynamics

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Nano Research 2022年第3期15卷 2734-2740页

作者： Zihan Zhao Weifeng Zhang Yan Zhang He Hao Shishu Zhang lianming tong Banghua Peng Nan Liu School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi UniversityShihezi 832003China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The variation of interlayer coupling can greatly affect the bandstructure of few layered transition metal dichalcogenides(TMDs),for instance,transition of indirect-to-direct bandgap and vice versa,which is correlated with the charge carrier and optical ***,methods that can modulate the coupling strength in a controllable way are still ***,we report a fluidic dynamic strategy to tune the interlayer coupling of folded bi-layer MoS_(2).By controlling the flow direction and particle size of the fluid,mono-layer MoS_(2)can be folded into bi-layer with a controlled folding direction for designated twist angles as well as tunable interlayer *** with normally folded bi-layer MoS_(2),the photoluminescence(PL)peak of the direct-bandgap transition for folded bi-layer MoS_(2)by fluid flow is weakened accompanied with the re-appearance of indirect-bandgap transition ***,the fluid flow creates a clear trajectory on the folded MoS_(2),exhibiting various degrees of interlayer coupling along ***-effect transistors(FETs)were further fabricated on tunably coupled folded-bi-layers,proving that the bandstructure and electrical property is strongly correlated with the degree of interlayer *** fluidic dynamic strategy can be extended to other TMDs on any substrate,and together with its excellent capability in controlled interlayer coupling,it will provide a new way for the development of TMDs optoelectronics.

关键词： molybdenum disulfide folding interlayer coupling fluidic dynamics photoluminescence(PL) bandstructure

Investigation of black phosphorus as a nano-optical polarization element by polarized Raman spectroscopy

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Nano Research 2018年第6期11卷 3154-3163页

作者： Nannan Mao Shishu Zhang Jinxiong Wu Huihui Tian Juanxia Wu Hua Xu Hailin Peng lianming tong Jin Zhang Center for Nanochemistry Beijing National Laboratory for Molecular Sciences Key Laboratory for the Physics and Chemistry of Nanodevices State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 China School of Materials Science and Engineering Shaanxi Normal University Ki'an 770062 China

Manipulating the polarization of light at the nanoscale is essential for the development of nano-optical devices. Owing to its corrugated honeycomb structure, two-dimensional （2D） layered black phosphorus （BP） exhibits outstanding in-plane optical anisotropy with distinct linear dichroism and optical birefringence in the visible region, which are superior characteristics for ultrathin polarizing optics. Herein, taking advantage of polarized Raman spectroscopy, we demonstrate that layered BP with a nanometer thickness can remarkably alter the polarization state of a linearly-polarized laser and behave as an ultrathin optical polarization element in a BP-Bi2Se3 stacking structure by inducing the exceptionally polarized Raman scattering of isotropic Bi2Se3. Our findings provide a promising alternative for designing novel polarization optics based on 2D anisotropic materials, which can be easily integrated in micro- sized all-optical and optoelectronic devices.

关键词： black phosphorus polarizing optics linear dichroism birefringence two-dimensional layered crystals

Multishelled CuO/Cu_(2)O induced fast photo-vapour generation for drinking water

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Nano Research 2022年第5期15卷 4117-4123页

作者： Xuanbo Chen Ping Li Jiao Wang Jiawei Wan Nailiang Yang Bo Xu lianming tong Lin Gu Jiang Du Jianjian Lin(✉) Ranbo Yu Dan Wang Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Biochemical Engineering Key Laboratory of Science and Technology on Particle MaterialsChinese Academy of SciencesBeijing 100190China Key Laboratory of Eco-chemical Engineering College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Henan Province Industrial Technology Research Institute of Resources and Materials Green Catalysis CenterCollege of ChemistryZhengzhou UniversityZhengzhou 450001China University of Chinese Academy of Sciences Beijing 100049China Center for Nano-chemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Solar thermal interfacial water evaporation is proposed as a promising route to address freshwater scarcity,which can reduce energy consumption and have unlimited application *** large semiconductor family with controllable bandgap and good chemo-physical stability are considered as good candidates for ***,the evaporation rate is not satisfactory because the rational control of nano/micro structure and composition is still in its infancy ***,by systemically analyzing the photo-thermal evaporation processes,we applied the hollow multishelled structure(HoMS)into this *** from the multishelled and hierarchical porous structure,the light absorption,thermal regulation,and water transport are simultaneously optimized,resulting in a water evaporation rate of 3.2 kg·m^(-2)·h^(-1),which is among the best performance in solar-vapour *** collected water from different water resources meets the World Health Organization standard for drinkable ***,by using the CuO/Cu_(2)O system,reactive oxygen species were generated for water disinfection,showing a new route for efficient solar-vapour generation and a green way to obtain safe drinking water.

关键词： multishelled structure hollow structure water evaporation nano/micro structure

Local modulation of exc辻ons and trions in monolayer WS2 by carbon nanotubes

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Nano Research 2020年第7期13卷 1982-1987页

作者： Rui Feng Shicheng Xu Weiming Liu Peng Gao Jin Zhang lianming tong Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China School of Physics Peking UniversityBeijing 100871China

Mixed dimensional van der Waals(VdW)heterostructures constructed by one-dimensional(1D)and two-dimensional(2D)materials exhibit extra degree of freedom to modulate the electronic and optical properties due to the combination of difterent *** charge transfer at the intertace between 1D and 2D materials plays a crucial role in the optoelectronic properties and performance of the heterostructure-based ***,we stacked single-walled carbon nanotubes(SWNTs)on monolayer WS2 for a mixed dimensional vdW heterostructure,and investigated the local modulation of excitions and trions in WS2 by *** directions of charge transfer between SWNTs and WSz are evidenced by the photoluminescence(PL)spectra of *** PL intensity can be either enhanced or weakened by individual *** our work,the PL intensity of WS2 is enhanced and the exciton peak position heterostructure is red-shifted about 3 meV due to the charge transfer from WS2 to an individual SWNT(SWNT#1).The change of PL by another SWNT(SWNT#2)can not be well-resolved in far fild,but scanning near field optical microscope(SNOM)measurements show that the PL intensity of WS2 is weakened by the *** peak position of exciton is blue-shifted by^1 meV while that of trion is redshifted by^1 meV due to the charge transfer from the SWNT to WS2,These results give insight into the charge transfer at the interface of SWNTWS2 heterostructure,and can be useful for design of optoelectronic devices based on mixed dimensional vdW heterostructures.

关键词： WS2 single-walled carbon nanotube(SWNT) mixed dimensional heterostructure excitons trion

Surface-enhanced Raman Scattering on 2-Dimensional Layered Materials

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Surface-enhanced Raman Scattering on 2-Dimensional Layered M...