fabrication of dual sensitive titania (tio2)/graphene oxide (go)one-dimensional photonic crystals (1dpcs)
1dpcs, such as bragg stack and distributed bragg mirrors, are the simplest photonic crystal. tio2/go1dpcs were fabricated by spin-coating technique. the photonic stopbands of the 1dpcs were measuredby fiber optic spectrometer. the results demonstrated that the 1dpcs with different stopbands could beobtained from controlling spin-coating and incident angles. the prepared 1dpcs have double responseto both dimethyl sulfoxide (dmso) and alkali solution.
photonic crystals, which can modulate light with a certain wave-length, are a class of functional materials with spatially ordered lattices. first introduced conceptually in 1987 [1,2]. according to the variation of refractive index and period in space, photonic crystals can be classified as one-dimensional, two-dimensional and three-dimensional photonic crystals. photonic crystals have a stopband, where light for a range of frequencies falling within thestop band cannot propagate through the photonic crystal structure[3]. photonic crystals can be designed for chemical and biological sensing when stimuli–responsive materials, responded to external stimuli, such as light, ph, organic solvent, temperature and so on ,are embedded in them [4,5]. recently, more and more responsive photonic crystals are applied in environmental monitoring [6,7],medical examination [8,9], biotechnology fields [10,11] and so on, due to their potential applications in sensors.
