I am trying to calculate the lateral dimensions of prepared graphene oxide nano-sheets dispersed in water, several articles have indicated that UV Vis can be used as a tool to do so . However, i couldn't understand the procedure adopted.
Dear Sir. Concerning your issue about the calculation of lateral dimension of 2D nanosheets by using UV-Vis spectroscopy . Carbon nanosheets are mechanically stable free-standing two-dimensional materials with a thickness of ~1 nm and well defined physical and chemical properties. They are made by radiation induced cross-linking of aromatic self-assembled monolayers. Here we present a route to the scalable fabrication of multilayer nanosheets with tunable electrical, optical and chemical properties on insulating substrates. Stacks up to five nanosheets with sizes of ~1 cm2 on oxidized silicon were studied. Their optical characteristics were investigated by visual inspection, optical microscopy, UV/Vis reflection spectroscopy and model calculations. Their chemical composition was studied by X-ray photoelectron spectroscopy. The multilayer samples were then annealed in ultra high vacuum at various temperatures up to 1100 K. A subsequent investigation by Raman, X-ray photoelectron and UV/Vis reflection spectroscopy as well as by electrical four-point probe measurements demonstrates that the layered nanosheets transform into nanocrystalline graphene. This structural and chemical transformation is accompanied by changes in the optical properties and electrical conductivity and opens up a new path for the fabrication of ultrathin functional conductive coatings. I think the following below links may help you in your analysis:
https://arxiv.org/ftp/arxiv/papers/1105/1105.5792.pdf https://arxiv.org/ftp/arxiv/papers/1409/1409.1087.pdf
https://www.nature.com/articles/s41467-017-01293-x
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