Sunday, January 06, 2013

Making graphene

This article piqued my interest, since it suggests that making graphene can be made cheaply and easily:
http://hackaday.com/2012/03/20/print-your-own-supercaps/

That article includes links to the March 2012 paper by the folks at UCLA: "Laser Scribing of High-Performance and Flexible Graphene-Based Electrochemical Capacitors" as well as the methods paper that gives details on how they prepared it.

Turns out Rice university did it in 2011:

Their paper, "Direct laser writing of micro-supercapacitors on hydrated graphite oxide films", is behind a paywall, but here's their supplemental paper with some useful stuff: http://www.nature.com/nnano/journal/v6/n8/full/nnano.2011.110.html

Where to get the graphite oxide?

Somebody set this site up: https://graphene-supermarket.com/ but the materials are expensive.

Pretty much everybody seems to use some variant of the Hummers process to make it from graphite flakes.

These guys claim an improved and safer process: http://www.youtube.com/watch?v=sTooYDp1KD4

This tantalizing snippet claims you can make it just from glucose:

"Graphite oxide has also been prepared by using a "bottom-up" synthesis method (Tang-Lau method) in which the sole source is glucose, the process is safer, more facile, and more environmentally friendly compared to traditionally “top-down” method, in which strong oxidizers must be involved. Another important advantage of Tang-Lau method is thickness controllable ranging from monolayer to multilayers by simply adjusting growth parameters."

But the article is behind a paywall and so I haven't been able to read it: http://pubs.rsc.org/en/content/articlelanding/2012/jm/c2jm15944a

This guy demonstrates some variant of Hummers method and talks about where to get the ingredients: http://www.youtube.com/watch?v=xbalCi6S_Oc

4 comments:

Doug said...

I too came across the same information and I am interested in using a light-scribe to print a Bifilar coil pattern onto a film of Graphite oxide. I wish to use this antenna shaped capacitor to generate a scalar wave at a frequency of 7.83hz. I understand this concept boarder’s pseudo-science, but after studying some Tesla patents, I feel there is merit in these efforts. Being a green minded individual with a thin wallet I am finding it difficult to spend $80-160US on graphite oxide synthesized using a non-environmentally friendly technique. I wish to see if synthesis using the Tang-Lau method is something I can do at home, but I too am blocked by the pay-wall. I also came across another green sounding method of synthesis here: http://pubs.acs.org/doi/full/10.1021/nn1002387 but that method does seem beyond my capabilities. I’m of the mindset that believes all information should be free so I’d rather buy the solution from here: https://graphene-supermarket.com/Graphene_Oxide/Solutions than to pay to access Tang-Lau paper if only it wasn't made in such a harsh manor.

sam.make said...

Hi,

for paywall blocked papers, try booksc.org

Anonymous said...

Robert Murray Smith has a video on youtube describing the tang lau method. It is short but informative.

Kelvin Peralta said...

FOUND IT O: thank you!