Photothermal Enhancement in Core-Shell Structured Plasmonic Nanoparticles
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Plasmonic nanoparticles (NPs) with photothermal effects can be exploited as efficient heat sources in various applications. Here, the photothermal properties in core-shell structured plasmonic NPs, including metal/silica NP, silica/metal NP, and metal/silica/metal NP, are investigated. Compared with bare metal NPs, the core-shell plasmonic NPs not only exhibit extremely agile tunability in the surface plasmon resonances but also show considerably enhanced photothermal effects in terms of the maximum temperature rise. For metal/silica NPs and metal/silica/metal NPs, the SiO2 shells function as effective thermal-protective layers for enhanced photothermal effect. For silica/metal NPs, the SiO2 core and the metal shell show uniform temperature rise. These findings are essential for applying the core-shell structured plasmonic NPs on photothermal imaging, nanofluidics, etc.
KeywordsPlasmonics Core-shell nanoparticle Photothermal effect
This work is supported by the National Natural Science Foundation of China (grant nos. 61275030, 61205030, and 61235007), the Qianjiang River Fellow Fund of Zhejiang Province, the Scientific Research Foundation for the Returned Overseas Chinese Scholars from the State Education Ministry, the Opened Fund of State Key Laboratory of Advanced Optical Communication Systems and Networks, the Fundamental Research Funds for the Central Universities, Doctoral Fund of Ministry of Education of China (grant no 20120101120128), the Swedish Foundation for Strategic Research (SSF), and the Swedish Research Council (VR).
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