期刊
ACS NANO
卷 14, 期 6, 页码 7454-7461出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c03127
关键词
DNA origami; self-assembly; plasmonic nanoparticles; circular dichroism; bimetallic nanoparticles
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) through the excellence cluster e-conversion
- European Research Council under the European Union's Horizon 2020 research and innovation program [818635]
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant [765703]
- DFG [SFB1032]
- EU Framework Programme for Research and Innovation Horizon 2020 [730872]
- NSF [DMR-0520547]
- United States-Israel Binational Science Foundation (BSF)
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China
- China Postdoctoral Science Foundation [2017M622992, 2019T120820]
- National Key Research and Development Program [2019YFB2203400]
- 111 Project [B20030]
- European Research Council (ERC) [818635] Funding Source: European Research Council (ERC)
The spatial organization of metal nanoparticles has become an important tool for manipulating light in nanophotonic applications. Silver nanoparticles, particularly silver nanorods, have excellent plasmonic properties but are prone to oxidation and are therefore inherently unstable in aqueous solutions and salt-containing buffers. Consequently, gold nanoparticles have often been favored, despite their inferior optical performance. Bimetallic, i.e., gold-silver core-shell nanoparticles, can resolve this issue. We present a method for synthesizing highly stable gold-silver core-shell NRs that are instantaneously functionalized with DNA, enabling chiral self-assembly on DNA origami. The silver shell gives rise to an enhancement of plasmonic properties, reflected here in strongly increased circular dichroism, as compared to pristine gold nanorods. Gold-silver nanorods are ideal candidates for plasmonic sensing with increased sensitivity as needed in pathogen RNA or antibody testing for nonlinear optics and light-funneling applications in surface enhanced Raman spectroscopy. Furthermore, the control of interparticle orientation enables the study of plasmonic phenomena, in particular, synergistic effects arising from plasmonic coupling of such bimetallic systems.
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