The first issue you'll run into is that the graphite grains they are using "several tens of micrometers grain size graphite powder" [1]. It might not be straigh

The first issue you'll run into is that the graphite grains they are using "several tens of micrometers grain size graphite powder" [1]. It might not be straightforward to make that from a pencil, but you could buy the powder online. I've not read the full paper so there might be more significant barriers to trying this at home, but it looks plausible. Good luck! [1] http://arxiv.org/pdf/1209.1938v1.pdf http://arxiv.org/pdf/1209.1938v1.pdf (end of page 1)