Methods for the preparation of metallic alloy nanoparticles and compositions thereof
A method of producing metal alloy nanoparticles comprising forming a cyanosol by reacting a mixture of a chlorometallate complex and a cyanometallate complex, spin-coating the mixture onto a substrate to form a film, and sintering the film to form metal alloy nanoparticles.
1 . A method for producing metal alloy nanoparticles, comprising
(a) reacting a chlorometallate complex with a transition metal cyanometallate complex to form a cyanosol;
(b) spin-coating the cyanosol to form a thin film; and
(c) sintering the film to form metal alloy nanoparticles.
2 . The method of claim 1 , wherein the chlorometallate complex and the cyanometallate complex are in aqueous solution.
3 . The method of claim 1 , wherein the metal in the chlorometallate complex comprises a transition metal.
4 . The method of claim 3 , wherein the metal is selected from Pd, Pt, Co, Ru, Ir, Fe, V, Mo, W, Zn, Ni, Au, Mn.
5 . The method of claim 1 , wherein the metal in the chlorometallate complex comprises a nontransition metal.
6 . The method of claim 5 , wherein the metal is Sn.
7 . The method of claim 1 , wherein the cyanometallate complex is a potassium or sodium salt of [Co(CN) 6 ] 3 , [Fe(CN) 6 ] 3− , [Fe(CN) 6 ] 4− ,[Fe(CN) 5 (L)] 3− , [Ru(CN) 6 ] 3− , [Os(CN) 6 ] 3− , [Cr(CN) 6 ] 3− , [Pt(CN) 6 ] 3− , [Pd(CN) 6 ] 3− , [Pt(CN) 4 ] 2 , [PD(CN) 4 ] 2− , [Mn(CN) 6 ] 4− , [Ni(CN) 4 ] 2− , [Mo(CN) 8 ] 4− and [W(CN) 8 ] 4− .
8 . The method of claim 1 , wherein the concentration of the chlorometallate complex and the cyanometallate complex in aqueous solutions are equimolar.
9 . The method of claim 1 , wherein the sintering temperature is 250° to 1000° C.
10 . The method of claim 1 , wherein the chlorometallate complex and the cyanometallate complex are mixed in a 3:1 ratio.
11 . The method of claim 1 , wherein the nanoparticles are 3-100 nm in size.
12 . A composition comprising a plurality of metal alloy particles, each particle having a size of 3-100 nm.
13 . The composition of claim 12 , wherein the particles comprise a homogeneous mixture of metal alloy.
14 . The composition of claim 13 , wherein the stoichiometry of the metals comprising the alloy is 3:1.
15 . The composition of claim 13 , wherein the particles are ferromagnetic.
16 . The composition of claim 13 , wherein the particles are paramagnetic.
17 . A method of producing Pd/Co alloy nanoparticles, comprising
(a) reacting an aqueous solution of Na 2 PdCl 4 and an aqueous solution of K 3 Co(CN) 6 to form a cyanosol;
(b) spin-coating the cyanosol to form a thin film; and
(c) sintering the film to form Pd/Co alloy nanoparticles.
18 . The method of claim 17 , wherein the Na 2 PdCl 4 and K 3 Co(CN) 6 aqueous solutions are equimolar.
19 . The method of claim 17 , wherein the Na 2 PdCl 4 and K 3 Co(CN) 6 aqueous solutions are have a concentration of between 1 mM to 1 M.
20 . The method of claim 17 , wherein the Na 2 PdCl 4 and K 3 Co(CN) 6 aqueous solutions are mixed in a 3:1 ratio.
21 . The method of claim 17 , wherein the cyanosol is spin-coated at 3000 rpm.
22 . The method of claim 17 , wherein the cyanosol is spin-coated at 4000 rpm.
23 . The method of claim 17 , wherein the film is sintered at 500° C.
24 . The method of claim 17 , wherein the film is sintered at 650° C.
25 . A method for producing a thin film of metal alloy nanoparticles, comprising
(a) reacting a chlorometallate complex with a transition metal cyanometallate complex to form a cyanosol;
(b) spin-coating the cyanosol onto a substrate to form a thin film of metal alloy nanoparticles.
26 . The method of claim 25 , wherein the chlorometallate complex and the cyanometallate complex are in aqueous solution.
27 . The method of claim 25 , wherein the metal in the chlorometallate complex comprises a transition metal.
28 . The method of claim 27 , wherein the metal is selected from Pd, Pt, Co, Ru, Ir, Fe, V, Mo, W, Zn, Ni, Au, Mn.
29 . The method of claim 25 , wherein the metal in the chlorometallate complex comprises a nontransition metal.
30 . The method of claim 29 , wherein the metal is Sn.
31 . The method of claim 25 , wherein the cyanometallate complex is a potassium or sodium salt of [Co(CN) 6 ] 3 , [Fe(CN) 6 ] 3− , [Fe(CN) 6 ] 4− ,[Fe(CN) 5 (L)] 3− , [Ru(CN) 6 ] 3− , [Os(CN) 6 ] 3− , [Cr(CN) 6 ] 3− , [Pt(CN) 6 ] 3− , [Pd(CN) 6 ] 3− , [Pt(CN) 4 ] 2 , [PD(CN) 4 ] 2− , [Mn(CN) 6 ] 4− , [Ni(CN) 4 ] 2− , [Mo(CN) 8 ] 4− and [W(CN) 8 ] 4− .
32 . The method of claim 25 , wherein the concentration of the chlorometallate complex and the cyanometallate complex in aqueous solutions are equimolar.
33 . The method of claim 25 , wherein the chlorometallate complex and the cyanometallate complex are mixed in a 3:1 ratio.
34 . The method of claim 25 , wherein the nanoparticles are 3-100 nm in size.