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1. (WO2018045271) CORE-SHELL HETEROSTRUCTURES COMPOSED OF METAL NANOPARTICLE CORE AND TRANSITION METAL DICHALCOGENIDE SHELL
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CLAIMS

1. A heterostructure composition composing a metal core encapsulated within a transition metal dichalcogenide (TMD) shell.

2. The composition of claim 1, wherein the metal core is a noble metal core.

3. The composition of claim 2, 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), and/or Osmium (Os).

4. The composition of claim 3, wherein the noble metal core comprises gold (Au).

5. The composition of claim 1, wherein the TMD shell is a monolayer or multilayer fullerene-like shell.

6. The composition of claim 1, wherein the TMD shell is a single or composite semiconductor of the type MX2, wherein M a transition metal and X is a chalcogen .

7. The composition of claim 6, wherein the transition metal is selected from Mo and W.

8. The composition of claim 6, wherein the chalcogen is selected from S, Se, and Te.

9. The composition of claim 6, wherein TMD shell comprises molybdenum disulfide (M0S2), tungsten disulfide (WS2), rhenium disulfide (ReS2), molybdenum diselenide (MoSe2), tungsten diselenide (WSe2), and/or Molybdenum ditelluride (MoTe2).

10. The composition of claim 6, wherein the TMD shell comprises 1-50 layers.

11. The composition of claim 1, wherein the noble metal nanoparticles are 5-200 nm in diameter.

12. The composition of claim 1, wherein the TMD shell is 0.65-32.5 nm thick.

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

14. The method of claim 13, wherein the monolayer or multilayer TMD shell is grown by chemical vapor deposition.

15. The method of claim 13, wherein the metal nanoparticle is formed by coating metal film onto a Si substrate via galvanic deposition or physical evaporation followed by high-temperature annealing.

16. The method of claim 13, wherein the metal nanoparticle-coated Si substrate is placed in a tube furnace and transition metal oxide and sulfur powder is carried over the substrate to form TMD shells on the nanoparticles.

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

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

19. The composition of claim 17, wherein metal nanoparticles encapsulated within a TMD shell are deposited onto the substrate using standard photolithography process.

20. The composition of claim 19, wherein Au nanoparticles encapsulated within a M0S2 shell are deposited onto the substrate using standard photolithography process.

21. The use of the composition of claim 1 in plasmonic hot electron enhanced optics and/or optoelectronics.