Revealing Lattice Defect Restoration in Graphene Oxide using Tip-Enhanced Raman Spectroscopy

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During this final year, the applicant could achieve relatively good progress in research work. Directly related to the KAKENHI proposal, one paper as the 1st author and two papers as the co-author were published.First of all, continuous monolayer graphene oxide (GO) films were fabricated on substrates and reduced via a combined chemical and thermal reduction method to obtain highly reduced and conductive graphene films. Defect restoration was achieved through ethanol-assisted thermal annealing.Secondly, TERS probes with good enhancement factor were developed via a UV-ozone and chemical reduction method, which has good reproducibility and durability. They work very well under gap mode, yet not good enough for non-gap mode. So, graphene films transferred to Au substrate via PDMS-stamping.