Self-assembly of colloidal nanocrystals(NCs)into large-scale superlattices with complex and controllable structures has attracted extensive attention due to their collective properties and promising device application...Self-assembly of colloidal nanocrystals(NCs)into large-scale superlattices with complex and controllable structures has attracted extensive attention due to their collective properties and promising device applications.Plasmonic NCs are very popular for long-range ordered superstructures by virtue of their collective nanogaps for electromagnetic field enhancement,in particular bulk-scale single-layer assembly.Large-area two-dimensional(2D)quasinanosheets(QNSs)composed of mono-component Au NCs or multi-component Au@ZnS core-shell hetero-nanocrystals(HNCs)were successfully prepared,via careful solvent evaporation-induced interfacial self-assembly.The entire selfassembly process was carried out on the liquid-air surface and mediated simply by tuning the operating temperatures and concentrations of the NCs.Specifically,monolayer and double-layer 2D QNSs in tens of micrometers scale with different stacking models were fabricated by precisely controlling the solvent evaporation rate and colloidal concentration.展开更多
Supramolecular polymer complexes with small molecules are self-assembled through non-covalent interactions and have been proposed for a wide variety of applications in materials science and nanoscience.Our research gr...Supramolecular polymer complexes with small molecules are self-assembled through non-covalent interactions and have been proposed for a wide variety of applications in materials science and nanoscience.Our research group has recently shown the possibility of forming highly ordered nanofibers of supramolecular complexes in their thermodynamically stable state using the electrospinning technique.The ultrafast solvent evaporation rate of electrospinning made possible the in-depth characterization of complexes that had never been prepared in their pure state before because of kinetic issues associated with their formation by conventional approaches.The improved understanding of the formation mechanism allowed us to extend the concept to other techniques featuring a fast solvent evaporation rate,such as electrospray and spin-coating.In this article,we review our most significant contributions in this research field.展开更多
Halide perovskite single crystals(HPSCs)provide a unique platform to study the optoelectronic properties of such emerging semiconductor materials,while the temperature induced crystal growth method often has an increa...Halide perovskite single crystals(HPSCs)provide a unique platform to study the optoelectronic properties of such emerging semiconductor materials,while the temperature induced crystal growth method often has an increased solute integration speed and/or unavoidable solute consumption,resulting in a soaring or slumping crystal growth rate of HPSCs.Here,we developed a universal and facile solvent-vola tilization-limited-growth(SVG)strategy to finely control the crystal growth rate by the fine-control-valve for high quality crystal grown through solution processes.The grown HPSCs by SVG method exhibited a record low trap density of 2.8×10^(8)cm^(-3)and a high charge carrier mobility-lifetime product(μτproduct)of 0.021 cm2/V,indicating the excellent crystal quality.The crystal surface defects were further passivated by oxygen suppliers as Lewis base,which led to a reduction of surface leakage current by two times when using for low dose rate X-ray detection.Such HPSC X-ray detector displayed a high sensitivity of 1274μC/(Gyair cm^(2))with a lowest detectable dose rate of 0.56μGyair/s under 120 keV hard X-ray.Further applications including alloy composition analysis and metal flaw detection by HPSC detectors were also demonstrated,which not only shows the bright future for product quality inspection and non-destructive materials analysis,but also paves the way for growing high quality single crystals and fabricating polycrystalline films.展开更多
基金supported by the National Natural Science Foundation of China(NSFC,51872030,51631001,21801015,21643003,51702016,51501010 and 21703219)the Fundamental Research Funds for the Central Universities+1 种基金Beijing Institute of Technology Research Fund Program for Young ScholarsJoint R&D Plan of HongKong,Macao,Taiwan and Beijing(Z191100001619002)。
文摘Self-assembly of colloidal nanocrystals(NCs)into large-scale superlattices with complex and controllable structures has attracted extensive attention due to their collective properties and promising device applications.Plasmonic NCs are very popular for long-range ordered superstructures by virtue of their collective nanogaps for electromagnetic field enhancement,in particular bulk-scale single-layer assembly.Large-area two-dimensional(2D)quasinanosheets(QNSs)composed of mono-component Au NCs or multi-component Au@ZnS core-shell hetero-nanocrystals(HNCs)were successfully prepared,via careful solvent evaporation-induced interfacial self-assembly.The entire selfassembly process was carried out on the liquid-air surface and mediated simply by tuning the operating temperatures and concentrations of the NCs.Specifically,monolayer and double-layer 2D QNSs in tens of micrometers scale with different stacking models were fabricated by precisely controlling the solvent evaporation rate and colloidal concentration.
基金supported by a grant and a graduate scholarship (MRL)from the Natural Sciences and Engineering Research Council of Canada(NSERC)
文摘Supramolecular polymer complexes with small molecules are self-assembled through non-covalent interactions and have been proposed for a wide variety of applications in materials science and nanoscience.Our research group has recently shown the possibility of forming highly ordered nanofibers of supramolecular complexes in their thermodynamically stable state using the electrospinning technique.The ultrafast solvent evaporation rate of electrospinning made possible the in-depth characterization of complexes that had never been prepared in their pure state before because of kinetic issues associated with their formation by conventional approaches.The improved understanding of the formation mechanism allowed us to extend the concept to other techniques featuring a fast solvent evaporation rate,such as electrospray and spin-coating.In this article,we review our most significant contributions in this research field.
基金the Fundamental Research Funds for the Central Universities,Jilin UniversityJilin University Scinece and Technology Innovation Research Team(2017TD-06)。
文摘Halide perovskite single crystals(HPSCs)provide a unique platform to study the optoelectronic properties of such emerging semiconductor materials,while the temperature induced crystal growth method often has an increased solute integration speed and/or unavoidable solute consumption,resulting in a soaring or slumping crystal growth rate of HPSCs.Here,we developed a universal and facile solvent-vola tilization-limited-growth(SVG)strategy to finely control the crystal growth rate by the fine-control-valve for high quality crystal grown through solution processes.The grown HPSCs by SVG method exhibited a record low trap density of 2.8×10^(8)cm^(-3)and a high charge carrier mobility-lifetime product(μτproduct)of 0.021 cm2/V,indicating the excellent crystal quality.The crystal surface defects were further passivated by oxygen suppliers as Lewis base,which led to a reduction of surface leakage current by two times when using for low dose rate X-ray detection.Such HPSC X-ray detector displayed a high sensitivity of 1274μC/(Gyair cm^(2))with a lowest detectable dose rate of 0.56μGyair/s under 120 keV hard X-ray.Further applications including alloy composition analysis and metal flaw detection by HPSC detectors were also demonstrated,which not only shows the bright future for product quality inspection and non-destructive materials analysis,but also paves the way for growing high quality single crystals and fabricating polycrystalline films.
