Electrochromism is the process by which a material applies a small electrical signal to change the optical properties(transmittance,reflectance,absorptivity and emissivity)of the material reversibly or permanently thr...Electrochromism is the process by which a material applies a small electrical signal to change the optical properties(transmittance,reflectance,absorptivity and emissivity)of the material reversibly or permanently through REDOX reactions resulting from ion and electron embedding/ejection.Metal-organic framework(MOF)are advantageous materials for electrochromic application due to their high porosity,large specific surface area and orderly pore structure,that promotes the adsorption of electrolyte ions,ion diffusion and charge transfer.In addition,MOFs possess a variety of ligands and metal centers,allowing for design of composition types and pore structure sizes.This grants them the advantages of both organic electrochromic materials,such as vivid colors and fast color transformation,and inorganic electrochromic materials,like high coloring efficiency and excellent stability.This paper reviews the current research progress of MOF electrochromic materials,including materials design,electrochromic properties,and application.展开更多
Plasmonic metasurfaces supporting high-quality(Q)resonances offer unprecedented ways for controlling light-matterinteraction at the nanoscale,yet scalable fabrication of such sophisticated nanostructures still relies ...Plasmonic metasurfaces supporting high-quality(Q)resonances offer unprecedented ways for controlling light-matterinteraction at the nanoscale,yet scalable fabrication of such sophisticated nanostructures still relies on expensive andmulti-step fabrication routes,hindering their practical application.Here,we produced plasmonic metasurfacescomposed of the regular arrangement of hollow protruding nanobumps via direct femtosecond laser patterning ofthin gold films.By using comprehensive optical modeling,infrared spectroscopy and angle-resolved third harmonicgeneration experiments,we justified that such laser-printed nanostructures support symmetry-protected plasmonicquasi-bound states in the continuum(qBIC)with a measured Q-factor up to 20.Moreover,under critical couplingconditions that match the radiative and nonradiative losses of the high-Q mode,the metasurfaces demonstrate thethird harmonic generation enhanced by a factor of≈10^(5)as compared to the smooth Au film benchmark,provingstructure efficiency for nonlinear conversion.Finally,by taking advantage of the simplicity and straightforwardcharacter of the laser printing process,we realized a field-effect transistor device with HgTe quantum dots as an activemedium and qBIC-supporting plasmonic metasurface imprinted over drain and source electrodes.The resultingmetasurface-empowered device operates at 200 K and 5 V bias voltage and demonstrates superior specific detectivityaround 8.7×10^(11)at the plasmonic-qBIC spectral region and fast response time,holding promise for the realization ofadvanced shortwave infrared photodetectors.展开更多
基金the National Natural Science Foundation of China(52072096)The Natural Science Foundation of Heilongjiang Province(LH2023E034).
文摘Electrochromism is the process by which a material applies a small electrical signal to change the optical properties(transmittance,reflectance,absorptivity and emissivity)of the material reversibly or permanently through REDOX reactions resulting from ion and electron embedding/ejection.Metal-organic framework(MOF)are advantageous materials for electrochromic application due to their high porosity,large specific surface area and orderly pore structure,that promotes the adsorption of electrolyte ions,ion diffusion and charge transfer.In addition,MOFs possess a variety of ligands and metal centers,allowing for design of composition types and pore structure sizes.This grants them the advantages of both organic electrochromic materials,such as vivid colors and fast color transformation,and inorganic electrochromic materials,like high coloring efficiency and excellent stability.This paper reviews the current research progress of MOF electrochromic materials,including materials design,electrochromic properties,and application.
基金supported by the Russian Science Foundation grant(No.24-19-00541)supported by the Russian Science Foundation grant(No.25-22-20034)+2 种基金support by the Federal Academic Leadership Program Priority 2030supported by the Research Grants Council of Hong Kong SAR(SRFS2324-1S04)Innovation and Technology Fund of Hong Kong SAR(ITS/027/22MX).
文摘Plasmonic metasurfaces supporting high-quality(Q)resonances offer unprecedented ways for controlling light-matterinteraction at the nanoscale,yet scalable fabrication of such sophisticated nanostructures still relies on expensive andmulti-step fabrication routes,hindering their practical application.Here,we produced plasmonic metasurfacescomposed of the regular arrangement of hollow protruding nanobumps via direct femtosecond laser patterning ofthin gold films.By using comprehensive optical modeling,infrared spectroscopy and angle-resolved third harmonicgeneration experiments,we justified that such laser-printed nanostructures support symmetry-protected plasmonicquasi-bound states in the continuum(qBIC)with a measured Q-factor up to 20.Moreover,under critical couplingconditions that match the radiative and nonradiative losses of the high-Q mode,the metasurfaces demonstrate thethird harmonic generation enhanced by a factor of≈10^(5)as compared to the smooth Au film benchmark,provingstructure efficiency for nonlinear conversion.Finally,by taking advantage of the simplicity and straightforwardcharacter of the laser printing process,we realized a field-effect transistor device with HgTe quantum dots as an activemedium and qBIC-supporting plasmonic metasurface imprinted over drain and source electrodes.The resultingmetasurface-empowered device operates at 200 K and 5 V bias voltage and demonstrates superior specific detectivityaround 8.7×10^(11)at the plasmonic-qBIC spectral region and fast response time,holding promise for the realization ofadvanced shortwave infrared photodetectors.
