[labnetwork] acetone in Acetylene
Bob Hamilton
roberthamilton at berkeley.edu
Mon Jul 15 10:45:21 EDT 2013
Mike Tiner,
Before making a decision of what form of acetylene to use for carbon
nanotube production it is worth reviewing issues with this gas. The well
known issue of acetylene being explosive and unstable at pressure over
~30 psig is one issue. This is why it is disolved in acetone and an
inert matrix in a welding cylinder. There are other issues worth
considering.
Acetylene derived from calcium carbide has some level of phosphine
contamination. This will be high enough PH3 to affect the dopant
properties of the nanotubes produced.
As a result of this PH3 contaminant the Microlab used calcium carbide as
a convenient surrogate when doing "bump" tests on our toxic gas
monitoring system and our hand-held monitor. CaC2 also provided a way to
let engineers know what phosphine smelled like. A small chunk of calcium
carbide in a beaker plus a little water produces that characteristic
odor. It was good instruction, in those less-litigious times, a time
when one could get away with a common-sense demonstrations.
Regards,
Bob Hamilton
On 7/14/2013 9:57 PM, Mike Tiner wrote:
>
> Dear All,
>
> I can't remember if this has been addressed before, but we are
> installing a CVD reactor for CNTs and graphene which uses Acetylene as
> one of the feed gasses. I am trying to decide whether to use a
> cylinder with or without acetone. Can anyone give insight into this?
> Do we require acetone?, is there a contamination issue to be aware of?
>
> Any advice will be appreciated.
>
> Best regards,
>
> Mike
>
> *Mike Tiner
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--
Robert Hamilton
University of California at Berkeley
Marvell NanoLab
Room 520 Sutardja Dai Hall
Berkeley, CA 94720-1754
bob at eecs.berkeley.edu
Phone: 510-809-8600
Mobile: 510-325-7557 (emergencies)
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