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  4. Tuning the color of high-karat gold in Au-TiO2 nanoparticle composites all the way to black
 
research article

Tuning the color of high-karat gold in Au-TiO2 nanoparticle composites all the way to black

Rossi, Lidia  
•
Horvath, Endre  
•
Wang, Tianyi
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May 17, 2024
Iscience

For centuries, artisans have harnessed gold nanoparticles to imbue their creations with the vibrant hues that captivate the eye through interactions with visible light. In modern times, these distinct optoelectronic characteristics have pivoted toward the forefront of innovative technologies, finding their niche in advanced applications from solar energy to medicine, overshadowing their artistic heritage. This investigation reimagines the utilitarian scope of gold by innovating the optical characteristics of gold-titania nanostructures. This allows for an expanded palette of colors that retain the value of the precious metal. We employ nanostructured TiO2 in a high -pressure -high -temperature sintering technique that stabilizes Au nanoparticles, thwarting coalescence, and Oswald ripening. Further refinement is possible by engineering TiO2 color centers through the introduction of oxygen vacancies and Ti3+ ions, which aid in creating an opulent high -karat black -gold, but preserve the mechanical attributes essential to the integrity and function of the final product.

  • Details
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Type
research article
DOI
10.1016/j.isci.2024.109655
Web of Science ID

WOS:001217094900001

Author(s)
Rossi, Lidia  
Horvath, Endre  
Wang, Tianyi
Grimaldi, Claudio  
Sienkiewicz, Andrzej  
Markus, Bence Ga'bor
Beke, David
Forro, Laszlo  
Date Issued

2024-05-17

Publisher

Cell Press

Published in
Iscience
Volume

27

Issue

5

Article Number

109655

Subjects

Raman-Spectrum

•

Tio2

•

Brookite

•

Coatings

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPMC  
LPM  
FunderGrant Number

Swiss watch-making industrial

Janos Bolyai Scholarship of the Hungarian Academy of Sciences

New National Excellence program

UNKP-21-5-BME-344

Available on Infoscience
June 5, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/208286
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