Conventional heteroatom-doped graphene
oxide (GO) nanozymes usually
suffer from complicated manufacturing processes and difficult recovery
of nanozymes. Herein, a facile and ecofriendly approach is developed
to write nitrogen- and boron-codoped GO nanozyme patterns on a flexible
plastic film by CO2 laser scanning in ambient air without
any catalyst, mask, or template. The resulting N-doped laser-induced
graphene (LIG) with a hierarchical porous and hydrophilic interface
possesses intrinsic peroxidase-like activities in catalyzing the typical
chromogenic reaction of 3,3′,5,5′-tetramethylbenzidine,
denoted as N-doped LIG nanozyme (N-LIGzyme). Further compositional
modification with boron atoms doped into N-LIGzyme (N,B-LIGzyme) produces
a significant and specific enhancement for the peroxidase-mimetic
activity with good reproducibility, high stability, and acceptable
recyclability. Owing to the high peroxidase-like activity of N,B-LIGzyme
that could convert H2O2 into a hydroxyl radical
(•OH), N,B-LIGzyme shows enhanced bactericidal ability
against both Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria. It is expected that the proposed facile and green synthesis
of N,B-LIGzyme atop flexible plastic films will not only open up an
exciting vista in the novel applications of classical LIG but also
provide a new avenue to design flexible nanozymes with excellent catalytic
activity, good operational stability, and easy separation.
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