Au–Cu<sub>2–<i>x</i></sub>Se Heterodimer Nanoparticles with Broad Localized Surface Plasmon Resonance as Contrast Agents for Deep Tissue Imaging

Xin Liu(University at Buffalo, State University of New York), Changho Lee(Pohang University of Science and Technology), Wing‐Cheung Law(University at Buffalo, State University of New York), Dewei Zhu(University at Buffalo, State University of New York), Maixian Liu(University at Buffalo, State University of New York), Mansik Jeon(University at Buffalo, State University of New York), Jeehyun Kim(Kyungpook National University), Paras N. Prasad(University at Buffalo, State University of New York), Chulhong Kim(University at Buffalo, State University of New York), Mark T. Swihart(University at Buffalo, State University of New York)
Nano Letters
August 28, 2013
10.1021/nl402124h
Cited by 181

Abstract

We report a new type of heterogeneous nanoparticles (NPs) composed of a heavily doped semiconductor domain (Cu2-xSe) and a metal domain (Au), which exhibit a broad localized surface plasmon resonance (LSPR) across visible and near-infrared (NIR) wavelengths, arising from interactions between the two nanocrystal domains. We demonstrate both in vivo photoacoustic imaging and in vitro dark field imaging, using the broad LSPR in Cu2-xSe-Au hybrid NPs to achieve contrast at different wavelengths. The high photoacoustic imaging depth achieved, up to 17 mm, shows that these novel contrast agents could be clinically relevant. More broadly, this work demonstrates a new strategy for tuning LSPR absorbance by engineering the density of free charge carriers in two interacting domains.

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