Fabrication And Application Of Responsive One Dimendional Photonic Crystals Ordered Thin Films

One dimensional photonic crystals （1DPCs） are special kinds of crystal multilayer interference, which consist of alternating layers of high and low-refractive-index materials with planar interfaces between each pair of layers, furthermore, their optical properties can be tuned by changing the refractive index or optical thickness. Moreover, introducing responsive materials into 1D photonic structures, which opens up new approaches for sensing applications such as mesoporous materials, vapor responsive polymers and conducting polymers. Nevertheless, the development of a general approach to shorten theresponse time of 1DPCs still remains challenging, which is highly dependent upon the modification of 1D structure and the chemical nature of the stimuli-responsive material. The detail works are as follow:（1） We have demonstrated a facile method to elucidate response to acidic/alkali vapor by the naked eye through color change based on patterning responsive 1DPCs. The distinct ’SEU’patterns were etched by the photolithography technique because of TiO₂. It would be promising as economically colorful sensors in chemical and biological fields, and environmental monitoring.（2） We reported a one-step method for acidic/alkali vapor responsive gradient structrue 1DPCs and a planar polyaniline （PANI） defect layer within SiO₂/graphene oxide （GO） 1DPC with tunable structural color. This gradient structure takes advantage of the structural color of photonic crystals and improve the identification of the response process. Meanwhile, the tunable defect mode 1DPCs with enhanced optical properties to acidic/alkali vapor. It can be used as acidic/alkali vapor monitoring devices.（3） We have successfully introduced a pH/temperature dually responsive P（AA-bis-NiPAAm）/TiO₂ 1DPC affording a new type of stimuli-responsive optical material with quick response time. It could contribute to a multitude of 1DPCs, implying that it could find applications in various areas, such as chemical sensors, and environmental monitoring.（4） We report a patterned dual responsiveness P（NiPPAm-GO-AA） one dimensional photonic crystal（1DPC） with controllable wettability. Thus opening opportunities to spatial control the wettability of patterned 1DPCs under external stimulus.（5） We report a flexible color indicative supercapacitor device with mesoporous polyaniline （mPANI）/P（NiPPAm-GO-AA） 1DPCs as the electrode material through a low-cost, eco-friendly, and scalable fabrication process. We found that the state-of-charge could be monitored by the structural color oscillation due to the change in the photonic band gap position of the 1DPCs. The flexible 1DPCs supercapacitor is thin at 3 mm and exhibits good specific capacitance of 22.6 F g-1 with retention of 91.1% after 3,000 cycles.