Methods and use of manipulating Au25 charge state

Patent metadata

Field	Value
Publication number	US-10358726-B2
Application number	US-201414573080-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Dec 18, 2013
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

Methods for manipulating charge states of Au nanoparticles and uses for the corresponding nanoparticles are described. A preferred embodiment comprises the following steps: 1) combining at least one Au nanocluster with at least one electron accepting molecule in the presence of an excess amount of counter ion; and 2) exposing the nanocluster, electron acceptor and counter ion mixture to light creating Au + nanoclusters. In one or more embodiments, an additional step of depositing the Au + nanoclusters onto a catalyst support is performed.

First claim

We claim:

1. A method for oxidization of a ligand protected Au 25 adsorbate comprising:
combining said Au 25 adsorbate with an electron accepting molecule and an excess amount of counter ion comprising an inorganic salt; and,
exposing said combination to a photophysical process in order to achieve an Au 25 adsorbate with an +1 tunable ground state charge of (Au 25 + ).

2. The method of claim 1 wherein said Au 25 adsorbate comprises Au 25 (SC 2 H 4 Ph) 18 .

3. The method of claim 2 further wherein said Au 25 (SC 2 H 4 Ph) 18 is negatively charged Au 25 (SC 2 H 4 Ph) 18 − .

4. The method of claim 2 further wherein said Au 25 (SC 2 H 4 Ph) 18 is neutrally charged Au 25 (SC 2 H 4 Ph) 18 .

5. The method of claim 1 wherein said photophysical process contains at least as much energy as HOMO-LUMO gap energy of said Au 25 adsorbate.

6. The method of claim 5 wherein said photophysical process comprises a wavelength of equal to or greater than 550 nm.

7. The method of claim 5 wherein said photophysical process comprises a wavelength of equal to or less than 680 nm.

8. The method of claim 5 wherein said HOMO-LUMO gap energy is 1.35 eV.

9. The method of claim 1 wherein said electron accepting molecule is O 2 , CO, Quinoline, K 3 Fe(CN) 6 , Ce(SO) 4 , oxoammonium cations, peroxide species, and combinations thereof.

10. The method of claim 1 , wherein said exposure of said combination to said photophysical process occurs in a solution comprising oxygen.

11. The method of claim 1 , wherein said inorganic salt is tetrabutylammonium perchlorate, tetrabutylammonium hexafluorophosphate, tetrabutylammonium tetrafluoroborate, and combinations thereof.

12. The method of claim 1 further comprising a catalyst support having the Au 25 + deposited thereon.

13. The method of claim 12 , wherein catalyst support is selected from the group comprising aluminum oxides, zeolites, and activated carbons.

14. A method of making an Au 25 + catalyst using the method of claim 1 further comprising depositing said Au 25 + onto a catalyst support.

15. The method of claim 14 , wherein said catalyst support is from the group comprising aluminum oxides, zeolites, and activated carbons.

16. A method of making an Au 25 + electrode using the method of claim 14 .

17. A method of making an Au 25 0 catalyst using the method of claim 1 further comprising depositing said Au 25 0 onto a catalyst support.

18. A method of making an Au 25 0 electrode using the method of claim 17 .

19. A method for oxidization of a ligand protected Au 25 adsorbate comprising:
combining said Au 25 adsorbate with an electron accepting molecule and an excess amount of counter ion comprising an inorganic salt;
a catalyst support selected from a group comprising aluminum oxides, zeolites, and activated carbons, and having the Au 25 + deposited thereon; and
exposing at least said combination to a photophysical process containing at least as much energy as HOMO-LUMO gap energy of said Au 25 adsorbate having a wavelength of equal to or greater than 550 nm but less than or equal to 680 nm in order to achieve an Au 25 adsorbate with an +1 tunable ground state charge of (Au 25 + ).

Assignees

• Kauffman Douglas
• Matranga Christopher
• Alfonso Dominic
• Ohodnicki Paul
• Deng Xingyi
• Siva Rajan C
• Zeng Chenjie
• Jin Rongchao
• Us Dept Energy

Inventors

• Kauffman Douglas
• Matranga Christopher
• Alfonso Dominic
• Ohodnicki Paul
• Deng Xingyi
• Siva Rajan C
• Zeng Chenjie
• Jin Rongchao

Classifications

• B01J23/52 Primary

  Gold · CPC title

• B22F1/0018

  Operations & Transport · mapped topic

• B01J35/0033

  Operations & Transport · mapped topic

• C25B11/0447 Primary

  Chemistry & Metallurgy · mapped topic

• C25B11/0473

  Chemistry & Metallurgy · mapped topic