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- W2604570737 abstract "The potential of rising two-dimensional materials, such as graphene, can be substantially expanded through chemistry. However, it has been a challenge to study how chemical reactions of two-dimensional materials progress. Existing techniques offer limited signal contrast and/or spatial-temporal resolution and are difficult to apply to in situ studies. Here we employ an optical approach, namely interference reflection microscopy, to quantitatively monitor the redox reaction dynamics of graphene and graphene oxide (GO) in situ with diffraction-limited (∼300 nm) spatial resolution and video-rate time resolution. Remarkably, we found that the oxidation kinetics of graphene is characterized by a seeded, autocatalytic process that gives rise to unique, wave-like propagation of reaction in two dimensions. The reaction is initially slow and confined to highly localized, nanoscale hot spots associated with structural defects, but then self-accelerates while propagating outward, hence flower-like, micrometer-sized reaction patterns over the entire sample. In contrast, the reduction of GO is spatially homogeneous and temporally pseudo-first-order, and through in situ data, we further identify pH as a key reaction parameter." @default.
- W2604570737 created "2017-04-14" @default.
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- W2604570737 date "2017-04-13" @default.
- W2604570737 modified "2023-09-27" @default.
- W2604570737 title "Spatially Resolved <i>in Situ</i> Reaction Dynamics of Graphene via Optical Microscopy" @default.
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- W2604570737 doi "https://doi.org/10.1021/jacs.7b00474" @default.
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