IP Library Granted Patent US 12,502,823
Granted Patent B2
US 12,502,823 · App. 18/154,257 · Granted Dec 23, 2025

Color image printing by polymer-assisted photochemical deposition

Inventors: Chao Wang (Chandler, AZ); Shinhyuk Choi (Tempe, AZ); Yu Yao (Chandler, AZ); Jiawei Zuo (Tempe, AZ)
Assignee: Arizona Board of Regents on behalf of Arizona State University
B29C64/106B29C35/0805B33Y10/00B33Y70/10B29C2035/0827
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Quick Facts
Patent No.
US 12,502,823
App. No.
18/154,257
Granted
Dec 23, 2025
Kind
B2
Abstract

A structural color image includes a metallic layer, a nanocomposite film, and a dielectric layer between and in direct contact with the metallic layer and the nanocomposite film. The metallic layer reflects visible light. The nanocomposite film reflects visible light and includes metallic nanoparticles in a polymeric material.

Claims (23)

1 . A method of forming a structural color image, the method comprising:

positioning a substrate in a liquid composition, wherein the substrate comprises a metallic layer and a dielectric layer, and the liquid composition comprises metal ions, a reductant, and a polymeric material;

irradiating the liquid composition at a surface of the dielectric layer with ultraviolet radiation, thereby reducing the metal ions to yield metal nanoparticles; and

coupling the metal nanoparticles to the polymeric material, thereby forming a layer of a nanocomposite film on the dielectric layer to yield the structural color image.

2 . The method of claim 1 , wherein the metallic layer comprises gold, silver, platinum, or any combination thereof.

3 . The method of claim 1 , wherein a thickness of the metallic layer is in a range of 50 nm to 250 nm.

4 . The method of claim 1 , wherein positioning a substrate in a liquid composition occurs at room temperature.

5 . The method of claim 1 , wherein the dielectric layer comprises silica.

6 . The method of claim 1 , wherein the dielectric layer comprises polymethylmethacrylate, polydimethylsiloxane, or polyethylene terephthalate.

7 . The method of claim 1 , wherein a thickness of the dielectric layer is in a range of 50 nm to 250 nm.

8 . The method of claim 1 , wherein the metal ions are provided by silver nitrate.

9 . The method of claim 1 , wherein the reductant comprises sodium citrate dehydrate.

10 . The method of claim 1 , wherein the polymeric material comprises poly(allylamine).

11 . The method of claim 1 , wherein a diameter of the metal nanoparticles is in a range of 5 nm to 100 nm.

12 . The method of claim 1 , wherein the metal nanoparticles comprise gold, silver, platinum, or a combination thereof.

13 . The method of claim 1 , wherein irradiating the liquid composition occurs for a length of time in a range of 10 seconds to 10 minutes.

14 . The method of claim 1 , wherein a thickness of the nanocomposite film is in a range of 5 nm to 50 nm.

15 . The method of claim 1 , wherein the nanocomposite film comprises one or more nanocomposite layers, wherein a thickness of each layer is in a range of 5 nm to 10 nm.

16 . The method of claim 1 , wherein coupling the metal nanoparticles to the polymeric material comprises adsorbing the polymeric material to a surface of the metal nanoparticles.

17 . The method of claim 1 , further comprising depositing a capping layer on the structural color image.

18 . The method of claim 17 , wherein the capping layer comprises polymethyl methacrylate.

19 . The method of claim 17 , wherein a thickness of the capping layer is in a range of 25 nm to 75 nm.

20 . The method of claim 1 , wherein a spatial resolution of the structural color image is in a range of 5 μm to 10 μm.

Assignments (2)
CONFIRMATORY LICENSE Recorded Feb 5, 2025
From: ARIZONA STATE UNIVERSITY-TEMPE CAMPUS
To: NATIONAL SCIENCE FOUNDATION
Reel/Frame 070112/0358 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 2, 2023
From: WANG, CHAO; CHOI, SHINHYUK; YAO, YU; ZUO, JIAWEI
To: ARIZONA BOARD OF REGENTS ON BEHALF OF ARIZONA STATE UNIVERSITY
Reel/Frame 062851/0768 →
Continuity (2)
Provisional Application 63299312 · Jan 13, 2022
Related Publication 20230219284A1 · Jul 13, 2023
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