title: Mesoporous bragg stack color tunable sensors.
abstract: Herein we report a novel self-assembly synthesis, structural and optical characterization of mesoporous Bragg stacks (MBS) composed of spin-coated multilayer stacks of mesoporous TiO(2) and mesoporous SiO(2). Investigation of the optical response of MBS to the infiltration of alcohols and alkanes into its pores reveals better sensitivity and selectivity than conventional Bragg reflectors. Furthermore, we demonstrate that the chemical sensing ability can be tuned via layer thickness, composition and surface properties.
authors.affiliation: Materials Chemistry Research Group, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6.
authors.forename: Sung Yeun
authors.initials: SY
authors.lastname: Choi
authors.forename: Marc
authors.initials: M
authors.lastname: Mamak
authors.forename: Georg
authors.initials: G
authors.lastname: von Freymann
authors.forename: Naveen
authors.initials: N
authors.lastname: Chopra
authors.forename: Geoffrey A
authors.initials: GA
authors.lastname: Ozin
mesh_terms: D000327:Adsorption; D000438:Alcohols / Q000737:chemistry; D000473:Alkanes / Q000737:chemistry; D008422:Materials Testing; D008567:Membranes, Artificial; D008855:Microscopy, Electron, Scanning / Q000379:methods; D055095:Optics and Photonics; D010316:Particle Size; D016062:Porosity; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D000438:Alcohols; D000473:Alkanes; D008567:Membranes, Artificial; C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium