Multiple solvent-response behavior of metal-organic inverse opals

This paper presents a multiple solvent-responsive behavior of metal-organic inverse opals (Pb(NO3)(2)-poly(St-MMA-AA)) fabricated from infiltrating Pb(NO3)(2) solution to the interstice of PC template then removing the template. Forth distinct solvent-responsive behaviors are observed. First, a common redshift of reflection spectra occurs to the sample owing to the volume swollen or growth of refractive index from the replacing of the air fraction by solvents. Second, little redshift is seen owing to the non-wettable property of sample to isopropanol/ethanol. Third, an unusual blue shift occurs to the sample upon water immersing, that can be attributed to the simultaneous collapse/reconstruction of the metal-organic frame, that leads to the transformation from the interconnect pores to separated hollow spheres and a decrease of building blockss dimension. Lastly, a larger redshift occurs for the resultant hollow sphere opals, because of the solvent infiltration of both the interstices and the inner air cavity of hollow spheres. The unique optical property of the sample can be a potential application in the field of optical devices. (C) 2017 Elsevier B.V. All rights reserved.