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Issue 41, 2015
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Experimental and theoretical photoluminescence studies in nucleic acid assembled gold-upconverting nanoparticle clusters

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Abstract

Combinations of rare earth doped upconverting nanoparticles (UCNPs) and gold nanostructures are sought as nanoscale theranostics due to their ability to convert near infrared (NIR) photons into visible light and heat, respectively. However, because the large NIR absorption cross-section of the gold coupled with their thermo-optical properties can significantly hamper the photoluminescence of UCNPs, methods to optimize the ratio of gold nanostructures to UCNPs must be developed and studied. We demonstrate here nucleic acid assembly methods to conjugate spherical gold nanoparticles (AuNPs) and gold nanostars (AuNSs) to silica-coated UCNPs and probe the effect on photoluminescence. These studies showed that while UCNP fluorescence enhancement was observed from the AuNPs conjugated UCNPs, AuNSs tended to quench fluorescence. However, conjugating lower ratios of AuNSs to UCNPs led to reduced quenching. Simulation studies both confirmed the experimental results and demonstrated that the orientation and distance of the UCNP with respect to the core and arms of the gold nanostructures played a significant role in PL. In addition, the AuNS–UCNP assemblies were able to cause rapid gains in temperature of the surrounding medium enabling their potential use as a photoimaging–photodynamic–photothermal agent.

Graphical abstract: Experimental and theoretical photoluminescence studies in nucleic acid assembled gold-upconverting nanoparticle clusters

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Publication details

The article was received on 27 Jul 2015, accepted on 25 Sep 2015 and first published on 28 Sep 2015


Article type: Communication
DOI: 10.1039/C5NR05035A
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2015,7, 17254-17260
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    Experimental and theoretical photoluminescence studies in nucleic acid assembled gold-upconverting nanoparticle clusters

    L. He, C. Mao, S. Cho, K. Ma, W. Xi, C. N. Bowman, W. Park and J. N. Cha, Nanoscale, 2015, 7, 17254
    DOI: 10.1039/C5NR05035A

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