Gold (Au) nanostructures embrace unique optical properties, commonly referred to as localized surface plasmon resonance (LSPR), for a broad spectrum of applications. For solid Au nanoparticles with a spherical shape, it is feasible to manipulate their LSPR peaks from 520 to 580 nm by increasing the diameter from 20 to 80 nm. For most biomedical applications, however, it is essential to tailor the LSPR peaks to the near-infrared (NIR) between 800 and 1200 nm, in which soft tissues are highly transparent to enable deep penetration. One approach to shift the LSPR property to NIR is to fabricate Au-based nanostructures with hollow interiors. Recently, we reported a strategy to selectively deposit Au on silver (Ag) nanocrystals as templates for the generation of Ag@Au core-shell nanostructures with thickness less than 2 nm.<sup>2</sup> Because Au is inert but Ag is extremely susceptible to an oxidative environment, we discovered a methodology for the transformation of core-shell nanocubes with edge length of 40 nm into Au-based nanoboxes with an ultrathin wall thickness less than 2 nm. We identified that these resultant Au nanoboxes exhibited strong plasmonic absorption in the near-infrared region.<sup>3</sup>

Gold nanoboxes with plasmonic absorption at near infrared wavelength

254th National Meeting (2017)

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