"High pressures are usually required to produce black phosphorus, but it can also be produced at ambient conditions using metal salts as catalysts"
Anybody know of a way to make this stuff?
I have tons of the Red P and If I could change this stuff to black phosphorus at a home/garage setting that would be really great since black
phosphorus seems to cost a lot and I pretty much rather make it myself and learn something while at it... IF its possible to do so!woelen - 15-2-2015 at 04:05
The only synthesis I have seen requires pressures of 12000+ bar, not something you do in a home lab.
There also seems to be a synthesis, using dissolved phosphorus in molten lead, but it is questionable whether the end product is really black P or
some impure violet P, contain lead as well.morganbw - 15-2-2015 at 04:26
Does black P have any benefit other than being rare?
@edit
I did a little googleing and I think it would be cool for this to be within my element collection. Odd that I did not know about this
[Edited on 15-2-2015 by morganbw]bolbol - 15-2-2015 at 07:23
Yeah the high pressure method is definitely out of question but I'm wondering if anyone knows that "metal salt catalyst" methodblogfast25 - 15-2-2015 at 08:56
The only synthesis I have seen requires pressures of 12000+ bar, not something you do in a home lab.
There also seems to be a synthesis, using dissolved phosphorus in molten lead, but it is questionable whether the end product is really black P or
some impure violet P, contain lead as well.
No, I'm fairly sure there is now a new route and that someone on SM actually had success with it.
A Google advanced domain specific search should unearth it.
I checked the PDFs and they mention the SnI4 + Au + P method but again that would be kind of hard to pull of and leave it at such high temperatures
for the amount of days that it is required.
I also noticed they mention a Mercury Catalyzed way along with this method and the high pressure method. But sadly they dont talk more about that... blogfast25 - 15-2-2015 at 15:27
bolbol: no one said it was going to be easy.bolbol - 15-2-2015 at 21:09
Yes I understand clearly but that method is still kind of way too hard. I'll do more searching of the citations that mention mercury catalysts and see
if I find something thats easier Fleaker - 17-2-2015 at 08:46
The Au/ SnI4 method works as advertised.
[Edited on 17-2-2015 by Fleaker]Bot0nist - 2-3-2015 at 13:44
From phys.org
"Phosphorus, a highly reactive element commonly found in match heads(sic), tracer bullets, and fertilizers, can be turned into a stable crystalline
form known as black phosphorus. In a new study, researchers from the University of Minnesota used an ultrathin black phosphorus film—only 20 layers
of atoms—to demonstrate high-speed data communication on nanoscale optical circuits.
The devices showed vast improvement in efficiency over comparable devices using the earlier "wonder material" graphene."
[Edited on 2-3-2015 by Bot0nist]DJF90 - 3-3-2015 at 04:11
Isn't there a prep in Brauer using mercury?The Volatile Chemist - 7-3-2015 at 15:33
Interesting. What about prep of violet phosphorus? Any easy, known methods? This is out of curiosity, though, as I'd have o way to make it.bolbol - 7-3-2015 at 16:10
I had few hundred grams in hot water over a hotplate for several hours and they lost their bright red color and look violet.. well they probably arent
pure violet phosphorus but I'm thinking some of it converted during that because now it looks way darker in color. I could be wrong thogdflp - 7-3-2015 at 16:29
Interesting. What about prep of violet phosphorus? Any easy, known methods? This is out of curiosity, though, as I'd have o way to make it.
Brauer has a prep for it, it involves dissolving white phosphorus in molten lead in an evacuated ampoule, heating it for a couple of days at between
400°C and 675°C then cooling and either dissolving the lead in nitric acid, or removing electrolytically.The Volatile Chemist - 8-3-2015 at 12:07
Thanks. Interesting.
I'm pretty sure Black Phosphorus is naturally found, one could always buy some at a mineral shop, or if you're looking for a more interesting way of
acquiring it, find it! woelen - 9-3-2015 at 00:21
Black phosphorus is not present as a (natural) mineral. Buying it is no option, unless you are very rich. Black P is very expensive, prices ranging
between $500 and $1000 per gram. In contrast, red P is appr. $10 per 100 grams and white P is a few dollars per gram (larger quantities make it
cheaper per gram).The Volatile Chemist - 13-3-2015 at 13:04
Black phosphorus is not present as a (natural) mineral. Buying it is no option, unless you are very rich. Black P is very expensive, prices ranging
between $500 and $1000 per gram. In contrast, red P is appr. $10 per 100 grams and white P is a few dollars per gram (larger quantities make it
cheaper per gram).
What natural allotropes of phosphorus are there, then? Or are there none?woelen - 13-3-2015 at 15:21
There are none. Phosphorus does not occur in nature as the free element.
Nearly all phosphorus in nature is in the +5 oxidation state (phosphate, pyrophosphate or more condensed phosphate-species). There may be some
phosphorus in the form of phosphine, due to certain anaerobic biological processes, but this only is a tiny fraction of all phosphorus in nature.
