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US5716709A
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Multilayered nanostructures comprising alternating organic and inorganic ionic layers
Assignee: Competitive Technologies Inc
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Filing: 1994-07-14
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Granted: 1998-02-10
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Expires: 2014-07-14
Abstract
Abstract A two-step adsorption process for producing ordered organic/inorganic multilayer structures is provided. Multilayered films are formed on metallic and nonmetallic substrates by alternate adsorption of a cationic polyelectrolyte and anionic sheets of a silicate clay. The two-step adsorption process is not only fast but allows also for preparation of multilayer elements of thicknesses greater than about 2200 Angstroms on silicon, and greater than about 1500 Angstroms on gold, silver, and copper.
Inventors
- 👤 Gregory S. Ferguson
- 👤 Elaine R. Kleinfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:32
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/52; C04B41/528; B; B05; B05D; B05D1/00; B05D1/18; B05D1/185; B82; B82Y; B82Y30/00; B82Y40/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536; Y10T428/31678
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
111 words
A multilayer structure formed on a substrate comprising: (a) at least one layer of an organic ionic material having an overall negative or positive charge and being characterized by its ability to adsorb ionic material having ions of an opposite charge; and (b) at least one layer of an inorganic ionic material having ions of opposite charge to that of the layer of organic ionic material, said layer of inorganic ionic material characterized by its ability to adsorb ionic material of opposite charge whereby the two layers are held together by ion exchange reaction, said organic ionic material layer and said inorganic ionic material layer together exhibiting a characteristic lattice spacing.
Claim 2
Dependent Claim
111 words
A multilayer structure formed on a substrate comprising: (a) at least one layer of an organic ionic material having an overall negative or positive charge and being characterized by its ability to adsorb ionic material having ions of an opposite charge; and (b) at least one layer of an inorganic ionic material having ions of opposite charge to that of the layer of organic ionic material, said layer of inorganic ionic material characterized by its ability to adsorb ionic material of opposite charge whereby the two layers are held together by ion exchange reaction, said organic ionic material layer and said inorganic ionic material layer together exhibiting a characteristic lattice spacing.
Claim 3
Dependent Claim
28 words
A multilayer structure according to claim 1 wherein the organic ionic layer is disposed on the substrate, said substrate characterized by its ability to adsorb an ionic material.
Claim 4
Dependent Claim
39 words
A multilayer structure according to claim 2 wherein the substrate is a silicon wafer capable of adsorbing ionic material, the layer of organic ionic material is a cationic material, and the layer of inorganic material is an anionic material.
Claim 5
Dependent Claim
14 words
A multilayer structure according to claim 2 wherein the substrate comprises a gold layer.
Claim 6
Dependent Claim
14 words
A multilayer structure according to claim 2 wherein the substrate comprises a silver layer.
Claim 7
Dependent Claim
14 words
A multilayer structure according to claim 2 wherein the substrate comprises a copper layer.
Claim 8
Dependent Claim
67 words
A multilayer structure according to claim 3 wherein the at least one layer of organic ionic material and the at least one layer of inorganic ionic material each comprises both cations and anions, wherein one of the at least one organic ionic layers or the at least one inorganic ionic layers comprises cations in excess of anions, and the other layer comprises anions in excess of cations.
Claim 9
Dependent Claim
21 words
A multilayer structure according to claim 1 wherein the at least one layer of organic ionic material is an organic polymer.
Claim 10
Dependent Claim
24 words
A multilayer structure according to claim 8 wherein the organic polymer is a cationic polymer and the inorganic material is an anionic inorganic material.
Claim 11
Dependent Claim
55 words
A multilayer structure according to claim 9 wherein the cationic at least one organic polymer is polydiallydimethylammonium chloride and the anionic inorganic material is silicate clay hectorite, said multilayered structure being characterized in that the layers are ordered in the direction normal to the surface of the substrate upon which the multilayer structure is formed.
Claim 12
Dependent Claim
19 words
A multilayered structure according to claim 1 wherein the lattice spacing is from about 1 to about 2 nanometers.
Claim 13
Dependent Claim
72 words
A multilayer structure having layers sufficiently ordered to diffract x-rays comprising: (a) a substrate characterized by the ability to adsorb a cationic organic material; (b) a layer of a cationic organic material adsorbed on the substrate; and (c) a layer of an inorganic material adsorbed by the layer of cationic organic material and bearing a negative charge so as to be capable of undergoing an ion exchange reaction with the cationic material.
Claim 14
Dependent Claim
72 words
A multilayer structure having layers sufficiently ordered to diffract x-rays comprising: (a) a substrate characterized by the ability to adsorb a cationic organic material; (b) a layer of a cationic organic material adsorbed on the substrate; and (c) a layer of an inorganic material adsorbed by the layer of cationic organic material and bearing a negative charge so as to be capable of undergoing an ion exchange reaction with the cationic material.
Claim 15
Dependent Claim
24 words
A multilayer structure according to claim 12 wherein the structure comprises a plurality of alternating layers of cationic organic material and anionic inorganic material.
Claim 16
Dependent Claim
19 words
A multilayered structure according to claim 12, wherein said multilayered structure has a thickness greater than about 2200 Angstroms.
Claim 17
Dependent Claim
23 words
A multilayer structure according to claim 13 wherein each of said plurality of alternating layers is characterized by having about the same thickness.
Claim 18
Dependent Claim
24 words
A multilayer structure according to claim 13 wherein the substrate is characterized by a hydroxylated surface on which the cationic organic material is adsorbed.
Claim 19
Dependent Claim
14 words
A multilayer structure according to claim 16 wherein the substrate is a silicon wafer.
Claim 20
Dependent Claim
15 words
A multilayer structure according to claim 17 wherein the cationic organic layer is a polyelectrolyte.
Claim 21
Dependent Claim
13 words
A multilayer structure according to claim 18 wherein the polyelectrolyte is polydiallyldimethylammonium chloride.
Claim 22
Dependent Claim
16 words
A multilayer structure according to claim 19 wherein the anionic inorganic material is a silicate clay.
Claim 23
Dependent Claim
13 words
A multilayer structure according to claim 20 wherein the silicate clay is hectorite.
Claim 24
Dependent Claim
39 words
A multilayer structure formed on a substrate having the layer stacking sequence of ABCBABCBAB, where A and C are different organic cationic polyelectrolites and B is an anionic inorganic material, wherein layers of the multilayered structure exhibit lattice spacing.
Claim 25
Dependent Claim
39 words
A multilayer structure formed on a substrate having the layer stacking sequence of ABCBABCBAB, where A and C are different organic cationic polyelectrolites and B is an anionic inorganic material, wherein layers of the multilayered structure exhibit lattice spacing.
References Cited (Backward Citations)
US4539061A
Cited
US5208111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-02-09 | 2001-08-11 | 2002-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-09 | 2005-08-11 | 2006-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-09 | 2009-08-11 | 2010-02-10 | $7700.00 | Window Closed / Lapsed |