# US 2023/0056483 A1 · Colloidal gold nanoparticles on anodic alumina oxide substrates for surface-enhanced raman scattering

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- Number: US 2023/0056483 A1
- Document ID: US20230056483A1
- Status: Published application
- Kind: A1
- Application number: 17/888,640
- Filed: 2022-08-16
- Published: 2023-02-23
- Earliest claimed: 2021-08-19
- Assignees: Salvo Technologies, Inc.
- Applicants: Salvo Technologies, Inc.
- Inventors: Lenzi Williams; Abdeljabbar R. Khamis; Hugh Garvey; John Dougherty
- Web page: https://patentgrep.com/patent/US20230056483A1

## CPC

- G01N 21/658: {enhancement Raman, e.g. surface plasmons}
- C23C 18/1658: {with two steps starting with metal deposition followed by addition of reducing agent}
- C23C 18/44: using reducing agents
- C25D 11/08: containing inorganic acids
- C25D 11/10: containing organic acids
- C25D 11/12: Anodising more than once, e.g. in different baths
- C25D 11/24: Chemical after-treatment
- C25D 11/16: Pretreatment {, e.g. desmutting}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

The preparation and colloidal gold nanoparticles deposited using a wet-chemical, three-phase ligand-exchange procedure carried out at room temperature on anodic alumina oxide to enhance detection of materials using Surface-enhanced Raman Scattering (SERS) is disclosed.

## Claims

### Claim 1

A method to synthesize colloidal gold nanoparticles on Anodic Alumina Oxide substrates for Surface-enhanced Raman Scattering comprising:
soaking A 250 mL Erlenmeyer flask in a base bath solution overnight;
thoroughly rinsing said flask with purified water and creating a solution by adding 200-300 mL of purified water and 0.05 to 0.06 grams HAuCl4;
turning off any lights to prevent any interaction with gold salt;
bringing said solution to a boil with moderate magnetic stirring on a hot plate;
once boiling, the stirring is increased until a vortex is achieved in said solution;
then rapidly adding 0.05 to 0.06 grams sodium citrate to said solution, and continue boiling with rapid stirring for 14 minutes;
removing said flask from the hot plate and cooling said solution to room temperature;
cooling said resulting solution containing colloidal gold nanoparticles in a refrigerator;
once cooled, measuring said colloidal gold nanoparticles solution with absorption spectroscopy to confirm the presence of a surface plasmon peak;
centrifuging said colloidal gold nanoparticles solution in plastic centrifuge tubes at 4000 rpm for 25 minutes for a batch comprising 6 plastic centrifuge tube; and,
forming colloidal gold nanoparticle films on nanoporous anodic alumina oxide substrates using a wet-chemical, three-phase ligand-exchange procedure carried out at room temperature.