Abstract
Among many thermo-photochromic materials, the color-changing behavior caused by temperature and light is usually lack of a full color response. And the study on visible light-stimuli chromic response is rarely reported. Here, we proposed a strategy to design a thermo-photochromic chameleon biomimetic material consisting of photonic poly(N-isopropylacrylamide-co-methacrylic acid) copolymer and plasmonic nanoparticles which has a vivid color change triggered by temperature and light like chameleons. We make use of the plasmonic nanoparticles like gold nanoparticles and silver nanoparticles to increase the sensitivity of the responsive behavior and control the lower critical solution temperature of the thermosensitive films by tuning the polymer chain conformation transition. Finally, it is possible that this film would have colorimetric responses to the entire VIS spectrum by the addition of different plasmonic nanoparticles to tune the plasmonic excitation wavelength. As a result, this method provides a potential use in new biosensors, military and many other aspects.
Highlights
It’s believable that the plasmonic nanoparticles can be used to improve the sensitivity of the PNIPAm film to diversified stimuli, especially the visible light
We present polymeric films coupling inverse opal structure with plasmonic nanoparticles such as AuNPs34 and AgNPs35 for biomimetic chameleon shown in Fig. 1, which is sensitive to the surrounding temperature, the infrared light (NIR) and the visible light (VIS)
A sensitive, reversible and repeatable thermo- and photo-stimuli chromic responsive PNcM film with the inverse opal structure and the noble nanoparticles addition is developed for biomimetic chameleon
Summary
It’s believable that the plasmonic nanoparticles can be used to improve the sensitivity of the PNIPAm film to diversified stimuli, especially the visible light. We present polymeric films coupling inverse opal structure with plasmonic nanoparticles such as AuNPs34 and AgNPs35 for biomimetic chameleon shown, which is sensitive to the surrounding temperature, the infrared light (NIR) and the visible light (VIS). The NIR and VIS irradiation can give rise to the improved allochroic response by the way of coupling the thermosensitive inverse opal film with plasmonic nanoparticles. The further results demonstrate that the themal- and photo-stimuli chromic response is attributed to the molecular conformation transformation of PNIPAm when the film temperature increases to induce conformation rotation from intermolecular hydrogen bond (state 1) into intramolecular hydrogen bond (state 2). The reasonable inference is that the thermosensitive film can exhibit different response to temperature, NIR and VIS below and above LCST because of the variation of polymeric physical properties such as density, volume and refractive index
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