1D photonic crystals (1DPCs) are well known from a variety of applications ranging from medical diagnostics to optical fibers and optoelectronics. However, large-scale application is still limited due to complex fabrication processes and bottlenecks in transferring 1DPCs to arbitrary substrates and pattern creation. These challenges were addressed by demonstrating the transfer of millimeter-to centimeter-scale 1DPC sensors comprised of alternating layers of H 3 Sb 3 P 2 O 14 nanosheets and TiO 2 nanoparticles based on a non-invasive chemical approach. By depositing the 1DPC on a sacrificial layer of lithium tin sulfide nanosheets and hydrophobizing only the 1DPC by intercalation of n-octylamine via the vapor phase the 1DPC can be detached from the substrate by immersing the sample in water. Upon exfoliation of the hydrophilic sacrificial layer, the freestanding 1DPC remains at the water-air interface. In a second step, it can be transferred to arbitrary surfaces such as curved glass. In addition, the transfer of patterned 1DPCs is demonstrated by combining the sacrificial layer approach with area-resolved intercalation and etching. The fact that the sensing capability of the 1DPC is not impaired and can be modified after transfer renders this method a generic platform for the fabrication of photonic devices.
In article number 2007864, Bettina V. Lotsch and co‐workers report a facile transfer of 1D photonic crystals and patterns thereof to arbitrary substrates by applying a sacrificial layer approach combined with spatially resolved amine intercalation for hydrophobization. Post‐transfer modification such as amine exchange or heat treatment allow an adaptive control of the sensing properties of the photonic crystals thus enlarging application possibilities.
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