Functional Nanostructured "Jelly Rolls" with Nanosheet Components

• US 20140147473A1
• Filed: 04/12/2013
• Published: 05/29/2014
• Est. Priority Date: 04/13/2012
• Status: Active Grant

• Current Assignee: The University of Georgia Research Foundation, Inc.
• Original Assignee: The University of Georgia Research Foundation, Inc.
• Inventors: Zhao, Yiping, Yao, Kun, Manjare, Manoj, Barrett, Christopher Andrew, Salguero, Tina Trnka
• Granted Patent: US 9,202,606 B2
• Time in Patent Office: Days
• US Class Current: 424/400
• CPC Class Codes: A61K 8/0233 Distinct layers, e.g. core/shell sticks
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys
• CPC Class Codes: H01M 6/40 Printed batteries , e.g. thin film batteries
• CPC Class Codes: Y10T 428/2918 including free carbon or carbide or therewith [not as steel]
• CPC Class Codes: Y10T 428/2935 Discontinuous or tubular or cellular core

Abstract

The present disclosure relates to multilayered materials that are designed to roll spontaneously into micron-sized, cylindrical “jelly roll” or scroll structures. Specifically in this disclosure, at least one of the layers is comprised of a nanosheet material.

Claims

1. A method of making a functionalized multilayer micron-sized scroll structure comprising:

depositing an aqueous solution of nanosheets onto a substrate;

coating the nanosheet layer with at first layer of a material to form a multilayer structure using vapor deposition, wherein the first layer comprises a metal containing substance selected from the group consisting of;

a pure metal, a metal oxide, a metal nitride, a metal oxynitride, a metal carbide, and a combination thereof;

adding a solvent; and

sonicating the multilayer material so that the multilayer material spontaneously forms a functionalized multilayer micron-sized scroll structure.

2. The method of claim 1, wherein the nanosheet comprises a material selected from the group consisting of:

graphene oxide (GO), graphene, MoS₂, hexagonal boron nitride (BN), and a combination thereof.

3. The method of claim 1, wherein the material of the first layer is selected from the group consisting of:

Ti, Pt, Fe, Ni, TiO₂, Fe₂O₃, Si, and a combination thereof;

4. The method of claim 1, wherein the multilayer material spontaneously forms a scroll structure by a detachment mechanism comprising a physical delamination process.

5. The method of claim 1, further comprising depositing a second layer of material on the first layer of material prior to adding the solvent.

6. The method of claim 5, wherein the second layer is comprised of a metal containing substance selected from the group consisting of:

a pure metal, a metal oxide, a metal nitride, and a combination thereof.

7. The method of claim 5, wherein the second layer is comprised of a material selected from the group consisting of:

Ti, Pt, Fe, Ni, TiO₂, Fe₂O₃, Si, and a combination thereof.

8. The method of claim 7, wherein the first layer is about 10 nm thick, and the second layer is about 10 to 25 nm thick.

9. The method of claim 1, wherein the multilayer material is sonicated for less than about one minute in 18 MΩ

aqueous solution.

10. The method of claim 5, wherein the multilayer material is sonicated for less than about one minute in 18 MΩ

aqueous solution.

11. The method of claim 5, further comprising depositing at least one additional layer on the second layer prior to adding the solvent.

12. The method of claim 11, wherein the first layer, the second layer, and the at least one additional layer are each at least about 1 nm thick.

13. The method of claim 1, further comprising immersing the functionalized multilayer micron-sized scroll structure in H₂O₂ to form microjet multilayer micron-sized scroll structures.

14. A functionalized multilayer micron-sized scroll structure comprising:

a first layer, wherein the first layer comprises a nanosheet wherein the nanosheet comprises a material selected from the group consisting of;

graphene oxide (GO), graphene, MoS₂, hexagonal boron nitride (BN), and a combination thereof; and

a second layer, wherein the second layer comprises a material selected from the group consisting of;

Ti, Pt, Fe, Ni, TiO₂, Fe₂O₃, Si, and a combination thereof,

wherein the first layer and the second layer roll spontaneously to form the multilayer micron-sized scroll structure, and wherein the scroll structure is open at both ends and hollow in the center.

15. The functionalized multilayer micron-sized scroll structure of claim 14, further comprising a third layer, wherein the third layer comprises a material selected from the group consisting of:

Ti, Pt, Fe, Ni, TiO₂, Fe₂O₃, Si, and a combination thereof.

16. The functionalized multilayer micron-sized scroll structure of claim 15, wherein the first layer comprises a graphene oxide (GO) nanosheet, the second layer comprises titanium (Ti), and the third layer comprises platinum (Pt), and wherein the Pt layer comprises the innermost layer located within the interior of the scroll structure, and the GO layer comprises the outermost layer of the scroll structure.

17. The functionalized multilayer micron-sized scroll structure of claim 14, wherein the nanosheet is at least a single monolayer thick, and wherein the nanosheet layer is about 0.5 to 3.0 nm in thickness.

18. The functionalized multilayer micron-sized scroll structure of claim 15, further comprising at least one additional layer, wherein the second layer, the third layer, and the at least one additional layer are each at least about 1 nm thick.

19. The functionalized multilayer micron-sized scroll structure of claim 14, wherein the structure acts as a microjet engine in the presence of H₂O₂ due to a reaction between the Pt layer and the H₂O₂ to form O₂, and wherein the structure moves at a constant speed of about 85 to 975 μ

m s<sup>−

1</sup>.

20. A method of using a functionalized multilayer micron-sized scroll structure selected from the group consisting of:

surface enhanced Raman spectroscopy (SERS), batteries, drug loading, drug delivery, hydrogen storage, catalytic reaction, and a combination thereof.