The best method in my view is grinding and then passing the particles through mesh. Other possible method is to soluble the material and then re-precipitate in a solvent in which it is not soluble.
This method might work for you.
https://www.researchgate.net/publication/5472343_Use_of_ionic_liquids_%28ILs%29_for_the_IL-anion_size-dependent_formation_of_Cr_Mo_and_W_nanoparticles_from_metal_carbonyl_M%28CO%296_precursors
Article Use of ionic liquids (ILs) for the IL-anion size-dependent f...
This could be a good method:
Colloidal approach for tungsten oxide nanorod-based electrochromic systems with highly improved response times and color efficiencies
So Yeon Park, Ji Min Lee, Changho Noh and Seung Uk Son*
J. Mater. Chem., 2009,19, 7959-7964
DOI: 10.1039/B912430F
If you have a laser, you can try by laser ablation in liquids:
http://pubs.rsc.org/en/content/articlehtml/2012/cp/c2cp42895d
http://www.sciencedirect.com/science/article/pii/S1389556712000251
To produce Wolfram nanoparticles I suggest you to try a redutcion process. I dont know much aboyt oxi-reduction potentials of wolfram salts, but maybe it is feaseble.
In my point of view, one of the appropriate and the simple method is the pulsed laser ablation of tungsten in water/ethanol. For this, you need to have laser. For the detail about the PLAL, you can use google search.
I think you might try using the reduction of the metal chloride in alcohol using dilute HF. This has been used with success with Pt. See Nakamura et al. Jpn,. J. Appl. Phys. 50(8R),081301, DOI: 10.143/JJAP.50.081301
Read also (for a facile electrochemical method)
Solar Energy Materials and Solar Cells
Volume 132, January 2015, Pages 329–336
I recently worked on synthesis of W(0) nanocrystals in colloidal technique..Decomposition of metal carbonyl complex in presence of surfactant like TOPO/TOP/OLeylamine/oleic acidis a godd technique for synthesis of Mo,Fe,Co nanocrystals truely in monodispered colloid solution in nature. A. Paul alivisatos published lots work regarding that you can find it in his group website.
I can refer the following for easy synthesis process.
Chem. Commun., 2014, 50, 4547--4550. But i think major drawback the chem comm work is the as-synthesized W(0) Nanocrystals is not well crystalline and requir a thermal annealing which generates WC nanocrystals.
For application purposes you hav to synthesize a good crystalline nanoparticle. My paper is not yet published, in revision. So i cannot send references. But I suggest you decompose the W(CO)6 complex in 1-octadecene solvent in presence of oleylamine at nearly 300 C for reaction more about 2 hrs in purely oxygen free dry Ar atmosphere. Mind it...presence of little amount of oxygen can generate WO3 nanocrystals (solution will be blue the surface plasmon resonance of WO3). similarly use oleic aacid, stearic acid or TOPO produces WO3 in the same reaction condition by oxygen donation of capping agent. The main reason is W is highly oxophilic metal. THe above describe procedure will generate 2-3 nm sized well crystalline W(0) in cubic phase. I think this will help you if you have the above mentioned chemicals or you can arrange it. Best of Luck..
Dear Sudip,
Maybe you can try the "solvothermal method" : e.g. reducing WO3 by hot ethylene glycol : it should produce nano particles. The main advantage: extremely simple. However, not sure W(VI) will be reduced down until W(0): it might be necessary to heat above the BP of ethylene glyco: maybe choosing a higher BP glycol (polyglycol).
See for instance: "Novel bismuth nanotube arrays synthesized by solvothermal method" Chemical Physics Letters, Volume 374, Issues 3–4, 11 June 2003, Pages 348–352
Regards
Michel Moliere UTBM Befort, FR
In case you may have missed this recent publication, see: C. Schöttle, P. Bockstaller, D. Gerthsenb, C. Feldmann, "Tungsten nanoparticles from liquid-ammonia-based synthesis", Chem. Commun., 50, 2014, 4547-4550; http://pubs.rsc.org/en/Content/ArticleLanding/2014/CC/c3cc49854a#!divAbstract
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology
- Nanostructured Materials
- Nanoparticles