Journal
NANO LETTERS
Volume 13, Issue 9, Pages 4333-4339Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl402124h
Keywords
Localized surface plasmon resonance; heavily doped semiconductor; photoacoustic imaging; metal nanoparticles; contrast agent
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Funding
- SUNY Buffalo startup funds
- IT Consilience Creative Program of MKE and NIPA [NIPA-2013-H0203-13-1001]
- NRF grant of Korea government (MSIP) [2011-0030075]
- National Research Foundation of Korea [2011-0030075] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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