US2005064731A1PendingUtilityA1
Transition metal oxide nanowires
Priority: Jul 20, 2001Filed: Jul 22, 2002Published: Mar 24, 2005
Est. expiryJul 20, 2021(expired)· nominal 20-yr term from priority
H03H 9/176C01P 2004/04C04B 2235/3208C01P 2006/40C01G 25/006C04B 2235/3213C04B 2235/526C01G 23/006C01P 2004/64C04B 2235/3215C04B 2235/3232C01P 2002/52C01G 45/1264C01P 2004/03C04B 2235/3296C04B 35/62231C04B 35/6264H03H 2009/241C04B 2235/3227C04B 2235/449H03H 2009/02165C04B 2235/3262C04B 35/62259C01P 2002/72C01P 2004/16C04B 2235/5264C04B 35/6225C01G 25/00B82Y 30/00C01P 2004/50C04B 2235/441C04B 2235/3244C01P 2002/54C01G 23/003C01P 2004/12B82B 1/00B82B 3/00H10N 30/2042H10N 30/306H10N 30/702
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Claims
Abstract
Nanowires are disclosed which comprise transition metal oxides. The transition metal oxides may include oxides of group II, group III, group IV and lanthanide metals. Also disclosed are methods for making nanowires which comprise injecting decomposition agents into a solution comprising solvents and metallic alkoxide or metallic salt precursors.
Claims
exact text as granted — not AI-modified1 . A nanowire comprising a transition metal oxide comprising:
A x A′ 1-x M y M′ 1-y O 3
wherein:
A and A′ are each independently selected from group II, group III, group IV and lanthanide metals;
M and M′ are independently for each occurrence a transition metal;
x is a whole or fractional number between 0 and 1 inclusive; and
y is a whole or fractional number between 0 and 1 inclusive.
2 . The nanowire of claim 1 , wherein said transition metal is tetravalent.
3 . The nanowire of claim 1 , wherein M and M′ are independently selected from the group consisting of Ti, Zr, Mn, Tc, and Re.
4 . The nanowire of claim 1 , wherein the length of the nanowire is greater than about 100 nm.
5 . The nanowire of claim 1 , wherein the diameter of the nanowire is less than about 50 nm.
6 . A nanowire comprising a transition metal oxide comprising:
A x A′ 1-x M y M′ 1-y O 3
wherein:
A and A′ are each independently selected from group II and group IV metals;
M and M′ are each independently a group IVB metal;
x is a whole or fractional number between 0 and 1 inclusive; and
y is a whole or fractional number between 0 and 1 inclusive.
7 . The nanowire of claim 6 , wherein the group II and group IV metals are selected from Ba, Pb, and Sr.
8 . The nanowire of claim 7 , wherein said group IVB metals are selected from Ti and Zr.
9 . The nanowire of claim 6 , wherein x is about 1 and y is about 0.
10 . The nanowire of claim 9 , wherein A is Ba.
11 . The nanowire of claim 6 , wherein x is about 0 and y is about 1.
12 . The nanowire of claim 11 , wherein M is Ti or Zr.
13 . The nanowire of claim 6 , wherein the length of the nanowire is greater than about 100 nm.
14 . The nanowire of claim 13 , wherein the diameter of the nanowire is less than about 50 run.
15 . A nanowire comprising a transition metal oxide, wherein said transition metal oxides are selected from the group consisting of BaTiO 3 , PbZrO 3 , PbZr y Ti 1-y O 3 and Ba x Sr 1-x TiO 3 , wherein x is a whole or fractional number between 0 and 1 inclusive, and y is a whole or fractional number between 0 and 1 inclusive.
16 . A nanowire comprising a transition metal oxide represented by
A x A′ 1-x MO 3
wherein:
A is a lanthanide metal;
A′ is a divalent metal;
M is a tetravalent transition metal; and
x is a whole or fractional number between 0 and 1 inclusive.
17 . The nanowire of claim 16 , wherein M is selected from Mn, Tc, and Re.
18 . The nanowire of claim 16 , where A′ is a Group II metal.
19 . The nanowire of claim 18 , wherein A′ is Ca.
20 . The nanowire of claim 16 , wherein A is La.
21 . The nanowire of claim 20 , wherein x is about 1.
22 . The nanowire of claim 19 , wherein x is about 0.
23 . The nanowire of claim 16 , wherein the length of the nanowire is greater than 100 run.
24 . A nanowire comprising a transition metal oxide, wherein said transition metal oxides are selected from the group consisting of LaMnO 3 , CaMnO 3 and La 1-x Ca x MnO 3 , wherein x is a whole or fractional number between 0 and 1 inclusive.
25 . A method of preparing transition-metal-oxide nanowires comprising:
a) injecting a decomposition agent into a solution comprising a solvent, a coordinating ligand, and a precursor metallic alkoxide or metallic salt; and b) heating said solution.
26 . The method of claim 25 , wherein said solution is heated to above about 200° C.
27 . The method of claim 25 , wherein said precursor metallic alkoxide comprises a AM-alkoxide, wherein A is a divalent metal and M is a tetravalent transition metal.
28 . The method of claim 27 , wherein said solution further comprises a further A′M′ alkoxide or a further metallic salt.
29 . The method of claim 25 , wherein said solvent is an organic solvent.
30 . The method of claim 29 , wherein said organic solvent is selected from the group consisting of an aliphatic compound, an aromatic compound, and an alkyl.
31 . The method of claim 30 , wherein said organic solvent is a higher alkyl.
32 . The method of claim 31 , wherein said organic solvent is heptadecane.
33 . The method of claim 25 , wherein said coordinating ligand comprises an amphipathic compound.
34 . The method of claim 25 , wherein said coordinating ligand comprises an amine.
35 . The method of claim 34 , wherein said coordinating ligand is an alkylamine with a long chain alkyl moiety.
36 . The method of claim 25 , wherein said coordinating ligand is selected from the group consisting of bis (2-ethylhexyl) amine, tridodecylamine, palmitic acid, trihexylamine, tridecylamine, lauric acid, oleic acid, and trioctylamine.
37 . The method of claim 25 , wherein said decomposition agent is an oxidant.
38 . The method of claim 37 , wherein said decomposition agent is selected from the group consisting of peroxides, chlorates, perchlorates, nitrates, permanganates, and water.
39 . The method of claim 37 , wherein said decomposition agent is selected from the group consisting of hydrogen peroxide and water.
40 . The method of claim 25 , wherein said precursor alkoxide is a bimetallic alkoxide.
41 . The method of claim 25 , wherein said precursor alkoxide is selected from the group consisting of metallic isopropoxides and bimetallic isopropoxides.
42 . The method of claim 41 , wherein said precursor alkoxide is selected from the group consisting of BaTi[OCH(CH 3 ) 2 ] 6 and SrTi[OCH(CH 3 ) 2 ] 6 .
43 . The method of claim 25 , wherein said precursor alkoxide is Mn(OAc) 2 . 4H 2 O.
44 . The method of claim 25 , wherein said precursor metallic salt has the form MX, wherein M is a trivalent or tetravalent metal, and X is an acid or base.
45 . A method for preparation of transition metal oxides of the general formula
A x A′ 1-x M y M′ 1-y O 3
wherein:
A and A′ are each independently selected from group II and group IV metals;
M and M′ are each independently a group IVB metal;
x is a whole or fractional number between 0 and 1 inclusive; and
y is a whole or fractional number between 0 and 1 inclusive; the method comprising:
a) injecting a decomposition agent into a solution comprising a solvent and a precursor metallic alkoxide or metallic salt; and
b) heating said solution.
46 . The method of claim 45 , wherein said precursor alkoxide comprises an AM-alkoxide.
47 . The method of claim 45 , wherein said solution further comprises a further precursor A′M′ alkoxide or metallic salt.
48 . The method of claim 45 , wherein said precursor alkoxide is a bimetallic alkoxide.
49 . The method of claim 45 , wherein said precursor alkoxide is selected from the group consisting of metallic and bimetallic isopropoxides.
50 . The method of claim 49 , wherein said precursor alkoxide is selected from the group consisting of BaTi[OCH(CH 3 ) 2 ] 6 and SrTi[OCH(CH 3 ) 2 ] 6 .
51 . The method of claim 45 , wherein said solvent is an organic solvent.
52 . The method of claim 51 , wherein said organic solvent is selected from an aliphatic compound, an aromatic compound, or an alkyl.
53 . The method of claim 52 , wherein said organic solvent is a higher alkyl.
54 . The method of claim 53 , wherein said organic solvent is heptadecane.
55 . The method of claim 45 , wherein said coordinating ligand comprises an amphipathic compound.
56 . The method of claim 45 , wherein said coordinating ligand comprises an amine.
57 . The method of claim 56 , wherein said coordinating ligand is an alkylamine with a long chain alkyl moiety.
58 . The method of claim 45 , wherein said coordinating ligand is selected from the group consisting of bis (2-ethylhexyl) amine, tridodecylamine, palmitic acid, trihexylamine, tridecylamine, lauric acid, oleic acid, and trioctylamine.
59 . The method of claim 45 , wherein said decomposition agent is an oxidant.
60 . The method of claim 59 , wherein said decomposition agent is selected from the group consisting of peroxides, chlorates, perchlorates, nitrates, permanganates, and water.
61 . The method of claim 59 , wherein said decomposition agent is selected from the group consisting of hydrogen peroxide and water.
62 . A method for preparation of transition metal oxides of the general formula
A x A′ 1-x MO 3
wherein:
A is a lanthanide metal;
A′ is a divalent metal;
M is a tetravalent transition metal; and
x is a whole or fractional number between 0 and 1 inclusive, wherein said method comprises a) injecting a decomposition agent into a solution comprising a solvent and a precursor metallic alkoxide or metallic salt; and
b) heating said solution.
63 . The method of claim 62 , wherein said precursor metallic salt has the form MX, wherein M is a trivalent or tetravalent metal, and X is an acid or base.
64 . The method of claim 62 , wherein said precursor alkoxide is Mn-alkoxide.
65 . The method of claim 64 , wherein said precursor alkoxide is Mn(OAc) 2 .4H 2 O.
66 . The method of claim 63 , wherein said precursor metallic salt is selected from the group consisting of A′(NO 3 ) 3 . mH 2 O and A(NO 3 ) 3 .mH 2 O, wherein m is an integer from 1 to 10.
67 . The method of claim 66 , wherein A′ is La and A is Ca; and m is 6.
68 . The method of claim 62 , wherein said solution is heated to above about 200° C.
69 . The method of claim 62 , wherein said solvent is an organic solvent.
70 . The method of claim 69 , wherein said organic solvent is selected from the group consisting of an aliphatic compound, an aromatic compound, and an alkyl.
71 . The method of claim 70 , wherein said organic solvent is a higher alkyl.
72 . The method of claim 71 , wherein said organic solvent is heptadecane.
73 . The method of claim 62 , wherein said coordinating ligand comprises an amphipathic compound.
74 . The method of claim 62 , wherein said coordinating ligand comprises an amine.
75 . The method of claim 74 , wherein said coordinating ligand is an alkylamine with a long chain alkyl moiety.
76 . The method of claim 62 , wherein said coordinating ligand is selected from the group consisting of bis (2-ethylhexyl) amine, tridodecylamine, palmitic acid, trihexylamine, tridecylamine, lauric acid, oleic acid, and trioctylamine.
77 . The method of claim 62 , wherein said decomposition agent is an oxidant.
78 . The method of claim 77 , wherein said decomposition agent is selected from the group consisting of peroxides, chlorates, perchlorates, nitrates, permanganates, and water.
79 . The method of claim 78 , wherein said decomposition agent is selected from the group consisting of hydrogen peroxide and water.Join the waitlist — get patent alerts
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