Fabrication and Spatially Resolved Functionalization of 3D Microstructures via Multiphoton‐Induced Diels–Alder Chemistry

Abstract

Three-dimensional microstructures are fabricated utilizing direct laser writing combined with a non-radical step polymerization based on multiphoton-induced Diels-Alder chemistry of o -quinodimethanes and maleimides. Woodpile photonic crystals with a total of fi ve axial periods and a rod spacing of down to 500 nm are fabricated. The structures are characterized via scanning electron microscopy and focused ion beam milling. In addition, corresponding photonic stop bands are investigated via light microscopy as well as transmission and refl ection spectroscopy. The Diels-Alder based network formation during direct laser writing is verifi ed via infrared spectroscopy. Spatially resolved surface patterning of covalently bonded functional molecules on fabricated structures is demonstrated by employing the direct laser writing setup and a bromine containing maleimide. The successful surface modifi cation is verifi ed via time-of-fl ight secondary ion mass spectrometry.

Microstructures, Post-TPP Processing

“…In this modification method, the laser that was employed for the TPP fabrication of the 3D polymer structure was employed to excite areas on the surface of the structure in order to modify those specific areas [18]. In this modification method, the laser that was employed for the TPP fabrication of the 3D polymer structure was employed to excite areas on the surface of the structure in order to modify those specific areas [18].…”

Simultaneous Dual Encoding of Three‐Dimensional Structures by Light‐Induced Modular Ligation

“…[13] Thus,s ubstantial work has been carried out for improving writing resolution [14] as well as writing speed. [18] In one approach, the scaffold was established by employing am ultifunctional thiol and av inyl ether linker for thiol-ene polymerization. Our group has established various two-step surface-functionalization methods that are based on the use of silane or polydopamine anchoring groups in combination with effective light-triggered transformations,e nabling the formation of well-defined surface patterns with spatiotemporal control.…”

“…[18] In one approach, the scaffold was established by employing am ultifunctional thiol and av inyl ether linker for thiol-ene polymerization. [18] In one approach, the scaffold was established by employing am ultifunctional thiol and av inyl ether linker for thiol-ene polymerization.…”

From UV to NIR light, photo-triggered 1,3 dipolar cycloadditions as a modern ligation method in solution and on surface

“…Scale bares are 1 μm (a), 2 μm (b) and 200 nm (c)). 12 Reproduced with permission of WILEY-VCH Verlag.…”

“…12 A polymer species carrying dipolarophile moieties along the backbone was prepared and crosslinked via a multifunctional o-methyl benzaldehyde derivative at 700 nm. The applied strategy allowed the fabrication of woodpile photonic crystals with rod spacings down to 500 nm (refer to Figure 16).…”