Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 18, Pages 9440-9445Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp4024298
Keywords
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Funding
- National University of Singapore
- Ministry of Education of Singapore [R279-000-298-112]
- Agency for Science, Technology and Research (A*STAR) [0921540099, 0921540098]
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We report the fabrication of inverse SiO2 opals doped with gold (i-Au-SiO2-o) nanoparticles (NPs) via a co-self-assembly method combined with subsequent removal of polystyrene colloidal spheres by calcination. The resulting i-Au-SiO2-o films demonstrate long-range ordering with uniform distribution of ligand-free Au NPs. The size of Au NPs can be tuned from 6 to 30 tun by varying the calcination temperature. The as-prepared i-Au-SiO2-o films preserve both localized surface plasmon resonance (LSPR) and Bragg diffraction peaks simultaneously. Both LSPR and Bragg diffraction peaks are sensitive to the refractive index changes of the surrounding medium-an important feature for sensing applications. The method provides a facile and versatile way to fabricate high-quality Au NP doped photonic crystals for applications in sensing and others.
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