Color from colorless nanomaterials: Bragg reflectors made of nanoparticles

• Published in: Journal of materials chemistry 2009-01, Vol.19 (21), p.3500-3506
• Main Authors: PUZZO, Daniel P, BONIFACIO, Leonardo D, OREOPOULOS, John, YIP, Christopher M, MANNERS, Ian, OZIN, Geoffrey A
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Electronic transport in condensed matter; Exact sciences and technology; Materials science; Nanoscale materials and structures: fabrication and characterization; Other topics in nanoscale materials and structures; Photoconduction and photovoltaic effects; photodielectric effects; Physics; Porous materials; granular materials; Specific materials
• ISSN: 0959-9428; 1364-5501
• DOI: 10.1039/b903229k

We report herein on a facile and reproducible approach to prepare mesoporous nanoparticle-based distributed Bragg reflectors (DBRs) from a diverse group of metal oxide nanoparticles including SiC@d2, TiO@d2, SnO@d2, and Sb:SnO@d2. The films prepared, regardless of the composition, and following dispersion and process engineering, demonstrate uniform color and high Optical quality over large areas. Not only do the prepared NP DBRs possess high reflectivity but also significant mesoporosity, which opens up the opportunity for introduction of a variety of materials into the pores creating new opportunities in optical and optoelectronic devices. In addition, what also must be highlighted are the added-value properties to the above characteristic of the individual NP materials comprising the DBR such as the electrical conductivity and optical transparency of ATO or the photoconductivity of SnO@d2, which enable new opportunities in a broad range of fields.