Core-shell heterostructures composed of metal nanoparticle core and transition metal dichalcogenide shell

Patent metadata

Field	Value
Publication number	US-11293869-B2
Application number	US-201716329280-A
Country	US
Kind code	B2
Filing date	Sep 1, 2017
Priority date	Sep 2, 2016
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

Provided herein are core-shell heterostructures design comprising a metal (e.g., noble metal) nanoparticle core and a transition metal dichalcogenide (TMD) shell, and methods of preparation and use thereof. In particular embodiments, the core-shell heterostructures described herein are synthesized by direct growth of a monolayer or multilayer fullerene-like TMD shell on a metal (e.g., noble metal) nanoparticle core, exhibit unique Raman scattering and photoluminescence characteristics, and are useful, for example, in plasmonic hot electron enhanced optics and optoelectronics.

First claim

The invention claimed is:

1. A heterostructure composition comprising a metal core encapsulated within a transition metal dichalcogenide (TMD) shell, wherein the metal core is a noble metal core, wherein the noble metal core comprises a single phase or alloy of gold (Au), silver (Ag), platinum (Pt), Palladium (Pd), Ruthenium (Ru), Rhodium (Rh), Iridium (Ir), or Osmium (Os), wherein the TMD shell comprises molybdenum disulfide (MoS 2 ), tungsten disulfide (WS 2 ), rhenium disulfide (ReS 2 ), molybdenum diselenide (MoSe 2 ), tungsten diselenide (WSe 2 ), or Molybdenum ditelluride (MoTe 2 ), wherein the metal core is 5-200 nm in diameter; and wherein the TMD shell is 0.65-32.5 nm thick.

2. The composition of claim 1 , wherein the noble metal core comprises gold (Au).

3. The composition of claim 1 , wherein the TMD shell comprises MoS 2 , MoSe 2 , or MoTe 2 .

4. The composition of claim 1 , wherein the TMD shell comprises WS 2 or WSe 2 .

5. The composition of claim 1 , wherein the TMD shell comprises 1-50 layers.

6. A method for preparing the composition of claim 1 comprising directly growing a monolayer or multilayer of the TMD shell on the metal core.

7. The method of claim 6 , wherein the monolayer or multilayer TMD shell is grown by chemical vapor deposition.

8. The method of claim 6 , wherein the metal core is formed by coating a metal film onto a Si substrate via galvanic deposition or physical evaporation followed by high-temperature annealing.

9. The method of claim 8 , wherein the metal-coated Si substrate is placed in a tube furnace and transition metal oxide and sulfur powder is carried over the substrate to form the TMD shell on the metal core.

10. A photodetector device comprising the composition of claim 1 .

11. A composition comprising the composition of claim 1 patterned onto a substrate.

Assignees

• Univ Northwestern

Inventors

• Li Yuan
• Chen Xinqi
• Dravid Vinayak P

Classifications

• H10F77/162

  Non-monocrystalline materials, e.g. semiconductor particles embedded in insulating materials (H10F77/169 takes precedence) · CPC title

• H10F77/12

  Active materials · CPC title

• C23C14/24

  Vacuum evaporation · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• C23C14/0021 Primary

  Reactive sputtering or evaporation · CPC title