期刊
ACS NANO
卷 8, 期 10, 页码 9790-9798出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn5031719
关键词
localized surface plasmon resonance; electron energy-loss spectroscopy; bimetallic nanoparticles; hybridization; silver; scanning transmission electron microscopy; ferromagnet
类别
资金
- Army Research Office [W911NF-13-1-0428]
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy [CNMS2013-284]
- Sustainable Energy Education and Research Center
- TN-SCORE
- Center for Materials Processing
- NSF [CMMI-0855949]
- NSF EAGER Grant [CBET-1349507]
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division [ERKCS81]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1349507] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [1004083] Funding Source: National Science Foundation
Interaction of photons with matter at length scales far below their wavelengths has given rise to many novel phenomena, including localized surface plasmon resonance (LSPR). However, LSPR with narrow bandwidth (BW) is observed only in a select few noble metals, and ferromagnets are not among them. Here, we report the discovery of LSPR in ferromagnetic Co and CoFe alloy (8% Fe) in contact with Ag in the form of bimetallic nanoparticles prepared by pulsed laser dewetting. These plasmons in metal-ferromagnetic nanostructures, or ferroplasmons (FP) for short, are in the visible spectrum with comparable intensity and BW to those of the LSPRs from the Ag regions. This finding was enabled by electron energy-loss mapping across individual nanoparticles in a monochromated scanning transmission electron microscope. The appearance of the FP is likely due to plasmonic interaction between the contacting Ag and Co nanoparticles. Since there is no previous evidence for materials that simultaneously show ferromagnetism and such intense LSPRs, this discovery may lead to the design of improved plasmonic materials and applications. It also demonstrates that materials with interesting plasmonic properties can be synthesized using bimetallic nanostructures in contact with each other.
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