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Optical changes and writing on hydrotalcite supported gold nanoparticles
Leonardo S Bonifacio1, Claudia R Gordijo, Vera R L Constantino
1Instituto de Quimica, Universidade de S. Paulo, Caixa Postal 26077 CEP 05513-970, São Paulo, SP, Brazil.
Journal of Nanoscience and Nanotechnology
|May 13, 2008
Summary
Gold nanoparticles (AuNP) integrated into hydrotalcite (HT) create a pigment whose color changes with temperature. This effect, driven by nanoparticle aggregation and fusion, allows for optical data storage.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Hydrotalcite (HT) materials offer unique structural properties for nanoparticle integration.
- Gold nanoparticles (AuNP) exhibit tunable plasmon resonance based on size and aggregation state.
Purpose of the Study:
- To investigate the incorporation of gold nanoparticles (AuNP) into hydrotalcite (HT) for novel pigment applications.
- To explore the temperature-dependent optical properties and aggregation behavior of AuNP within an HT matrix.
- To assess the potential for optical data writing using laser-induced modifications.
Main Methods:
- Incorporation of gold nanoparticles into hydrotalcite.
- Characterization using microscopy techniques (TEM, STM).
- Analysis of plasmon resonance and interference bands.
- Thermal and laser-induced modification studies.
Main Results:
- Gold nanoparticles preferentially bind to the external basal surface of hydrotalcite.
- AuNP aggregates exhibit plasmon resonance and interference bands around 520 nm and 700 nm.
- Temperature-induced color changes result from nanoparticle aggregation and fusion.
- Laser irradiation can induce similar optical modifications.
Conclusions:
- HT-supported gold materials function as thermochromic pigments.
- The interplay between aggregation and fusion governs the optical response.
- Potential for optical information storage using these novel materials.
