| With the development of the energy crisis and the satisfaction of user visual comfort,stimuli-responsive materials have become a new favorite in intelligent devices.In particular,intelligent optical materials can respond by optical signals to external environment stimuli（e.g.,humidity,temperature,pressure,etc.）,drawing much attention.At present,most smart optical materials use external stimuli to trigger chemical reactions,changes in refractive index,and structural adjustments of the materials themselves to achieve optical modulations such as color and transparency.Plasmonic nanomaterial stands out in smart optical displays,based on its superly sensitive property to some factors such as size,morphology,composition,and refractive index,which endows highly tunable absorption wavelength.However,most smart optics exhibit a single-optical response at the expense of visual enjoyment.Once the plasmon-based nanomaterial structure is determined,it is difficult to achieve deep modulation.In addition,some smart optical devices require additional high consumption of electrical and kinetic energy to achieve.Based on it,in this paper,the structure-optimized designed carboxyl-functionalized silver nanoplates composite nanofibers are used to construct smart optical films to break through bottlenecks such as low optical modulation,single optical response,high energy input.The composite device can obtain moisture-responsive plasmon-induced color switching,highly sensitive evolution from Raman to photoluminescence,and modulation of transparency,which provides a new idea for the further development of smart optical displays.The specific research content and performance of this topic are:（1）Ag@HA films were prepared by complexing triangular silver nanoparticles（Ag NPs）with hyaluronic acid（HA）containing a carboxyl group（-COOH）.Due to the highly sensitive properties of Ag NPs to refractive index and electron density,as well as the excellent hygroscopic expansion properties of HA,it was found that the film can achieve surface plasmon resonance（SPR）modulation depth of Ag NPs up to more than 50 nm under humidity stimulation,with noticeable switchable colors.More intriguingly,an evolution occurs from weakening Raman intensity to photoluminescence enhancement with increasing humidity gradient,which results from the continuous enlargement of the molecular gap between Ag NPs and HA with increasing humidity,leading to plasmon-induced luminescence quenching evolving into luminescence enhancement.（2）A smart responsive optical film（Ag@HA/nanofiber）was prepared by embedding Ag@HA as a filler into a polyvinyl alcohol-polyethylene nanofiber（PVA-co-PE）substrate with a three-dimensional network structure.It is found that Ag@HA/nanofiber achieves a reversible change in transparency of over 47% under moisture on/off conditions,which is attributed to the highly matched initial refractive indices of PVA-co-PE and HA and the vastly different hygroscopic expansion ratios.Under moisture stimulation,a large change in the total refractive index occurs,and the microstructure of the material surface evolves from a smooth to a rough interface.In this project,a smart optical device has been constructed to realize multiple optical responses to moisture stimulation with low energy consumption,specifically bright SPRinduced color conversion,SPR-driven highly sensitive transition of Raman-to-luminescence,and transparency evolution.It is expected to become a new type of intelligent optical devices such as humidity sensing,moisture decoding,and Raman sensing. |
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