Hi everyone. The reported photo refer to graphite flakes exfoliated by a chemo-mechanical method. I would like to know if the observed structures could be identified with few- or mono-layer graphene nanosheets. Or in other words, do graphene nanosheets exhibit similar topology under cross polarizers?

Image A and B shows a wide field view (scale bars 200 and 40 um, respectively)

While C and D compare the same site, with polarizers at 90 and 78 degrees respectively (scale bar 50 um).

It is possible to see how as polarizers are rotated from the 90 position, the observed features seems progressively to "vanish"...

In literature I found prevalently optical images of graphenes with lateral size in the order of nanometres, but not in the order of microns, therefore I wanted to ask. Every feedback, answer will be of big help and very appreciated. Thank you all in advance.

#graphene #exfoliation