Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 24, Pages 13180-13188Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03240
Keywords
UV treatment; mesoporous films; Bragg mirrors; flexible substrate
Funding
- NSF Center for Hierarchical Manufacturing [CMMI-1025020]
- G8 Research Councils Initiative on Multilateral Research through the NSF [CMMI-1258336]
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Highly transparent mesoporous titanium dioxide (TiO2; anatase), thin films were prepared at room temperature via ultraviolet (UV) irradiation Of hybrid polymer-TiO2 nanoparticle thin films: This approach utilized a UV-curable polymer in conjunction with the photocatalytic activity of TiO2 to form and degrade the organic component of the composite films in one step, producing films with well-controlled porosity and refractive index. By adjustment of the loading of TiO2 nanoparticles in the host polymer, the refractive index was tuned between 1.53 and 1.73. Facile control of these properties and mild processing conditions was leveraged to fabricate robust one-dimensional photonic crystals (Bragg mirrors) consisting entirely of TiO2 on silicon and flexible poly(ethylene terephthalate) substrates. The mesoporous Bragg mirrors were shown to be effective chemical vapor sensors with strong optical responses.
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