Figure 5
Photonic nanoporous microparticles obtained from NAA-DBR photonic films.
(a) Fabrication process of μP-NAA-DBRs by breaking down NAA-DBR films into microparticles via sonication. (b) Optical microscopy image (natural illumination) of μP-NAA-DBRs showing how these microparticles can be massively produced from NAA-DBR films (scale bar 100 μm). (c) SEM image of μP-NAA-DBRs showing the morphology of this photonic material, which can be produced with a narrow size distribution by adjusting the sonication parameters (scale bar = 50 μm). (d–e) Optical microscopy images of different μP-NAA-DBRs in air (d-e) and IPA (f–g) (scale bars = 50 μm). (h) Schematic illustration of the sensing principle (i.e. colour change) in μP-NAA-DBRs based on changes in their effective medium. (i) Optical microscopy images extracted from videos S1 and S2 (Supporting Information), demonstrating how μP-NAA-DBRs can be used as photonic sensing tools to detect analytes by colorimetry (scale bars = 50 μm) (left column—μP-NAA-DBR(1035s;1 °C) and right column—μP-NAA-DBR(1035s;−1 °C)).
