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

在这最后一年，申请人的研究工作取得了较好的进展。与KAKENHI的提案直接相关的是，发表了1篇第一作者论文和2篇合著论文。首先，在基底上制备了连续单层氧化石墨烯（GO）薄膜，并通过化学还原和热还原相结合的方法还原得到高度还原的导电石墨烯薄膜。通过乙醇辅助热退火实现了缺陷的修复。其次，采用紫外-臭氧和化学还原法制备了增强因子良好的TERS探针，具有良好的重复性和耐久性。它们在间隙模式下工作得很好，但在非间隙模式下工作得不够好。因此，石墨烯薄膜转移到Au衬底通过PDMS冲压。

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.