Raman Laser Reduction Weakens Graphene Oxide Under Cyclic Loading

Nano-IR, XPS, and AFM measurements show that laser treatment removes crack-arresting epoxide groups while leaving vacancy defects behind

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Laser reduction of graphene oxide decreases its fatigue resistance despite lowering defect levels as measured by Raman spectroscopy.
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The study indicates that the chemical identity and history of defects significantly affect graphene oxide's response to mechanical loading.
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Raman laser irradiation modifies graphene oxide chemically, preferentially removing epoxide groups while not repairing vacancy-type defects.
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Cyclic loading tests revealed that laser-reduced graphene oxide had shorter fatigue lifetimes compared to oxidized samples with similar defect ratios.
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The findings suggest that Raman defect ratios alone are insufficient for predicting the fatigue reliability of chemically modified graphene oxide.

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