We report a new biopolymer resist that uses functionalized N-acetylglucosamine (NAG) as a monomer and is suitable for direct laser writing (DLW). Since NAG is the monomeric unit of chitin, a biopolymer found in the exoskeletons of various arthropods, the resist expands the available DLW-suitable biopolymers from plant- to animal-based. Furthermore, we show that the simultaneous use of two different photoinitiators is advantageous over the use of only one initiator. Here, the first photoinitiator, which acts as a good two-photon absorber (2PA) for the wavelength used, radicalizes the second photoinitiator (poor 2PA), which is more suitable for crosslinking the NAG.
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