Highly ordered films of polystyrene(PS)micro-spheres have demonstrated various merits in optoelectronic devices,given their size-and thickness-dependent optical properties.So far,various solution strategies have been ...Highly ordered films of polystyrene(PS)micro-spheres have demonstrated various merits in optoelectronic devices,given their size-and thickness-dependent optical properties.So far,various solution strategies have been developed for making such highly ordered films,which have suffered from the lack of precise control on the film thickness(i.e.,layer number of micro-spheres).Here,we developed a facile fibrous liquid bridge strategy for fabricating highly ordered PS micro-sphere films,featured as the finely tunable mono-to multi-layer.Guided by a horizontally placed fiber with both ends passing through a capillary tube,respectively,the solution was transferred steadily onto the target substrate forming a homogeneous liquid film,whose dewetting process thus confines the assembly ofmicro-spheres in a well-controllablemanner.Depending on both the solution-shearing speed and the local concentration,a dynamic equilibrium between liquid transfer and evaporation was realized,which enables the formation of highly ordered micro-sphere films with finely tunable layer numbers.We demonstrated the angle-specific information encryption for anti-counterfeiting by utilizing patterned PS micro-sphere films that modulate structural colors based on layer-dependent optical responses.The result offers a new perspective for fabricating highly ordered film with tunable layers.展开更多
基金supported by the National Natural Science Foundation of China(nos.22125201,22532003,and 22405014)the China Post-Doctoral Science Foundation(no.2023 M740182)Suzhou Key Laboratory of Bio-Inspired Interfacial Science(SZ2024004).
文摘Highly ordered films of polystyrene(PS)micro-spheres have demonstrated various merits in optoelectronic devices,given their size-and thickness-dependent optical properties.So far,various solution strategies have been developed for making such highly ordered films,which have suffered from the lack of precise control on the film thickness(i.e.,layer number of micro-spheres).Here,we developed a facile fibrous liquid bridge strategy for fabricating highly ordered PS micro-sphere films,featured as the finely tunable mono-to multi-layer.Guided by a horizontally placed fiber with both ends passing through a capillary tube,respectively,the solution was transferred steadily onto the target substrate forming a homogeneous liquid film,whose dewetting process thus confines the assembly ofmicro-spheres in a well-controllablemanner.Depending on both the solution-shearing speed and the local concentration,a dynamic equilibrium between liquid transfer and evaporation was realized,which enables the formation of highly ordered micro-sphere films with finely tunable layer numbers.We demonstrated the angle-specific information encryption for anti-counterfeiting by utilizing patterned PS micro-sphere films that modulate structural colors based on layer-dependent optical responses.The result offers a new perspective for fabricating highly ordered film with tunable layers.
