Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 39, Pages 13558-13561Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja507368z
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Funding
- National Key Basic Research Program of China [2013CB932702, 2011CB911000]
- Research Fund for the Program on National Key Scientific Instruments and Equipment Development [2011YQ0301241402]
- National Natural Science Foundation of China [NSFC 21105025, NSFC 21221003, NSFC 21327009]
- U.S. National Institutes of Health [GM079359, CA133086]
- Hunan Innovation and Entrepreneurship Program
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Noble metals, especially gold, have been widely used in plasmon resonance applications. Although silver has a larger optical cross section and lower cost than gold, it has attracted much less attention because of its easy corrosion, thereby degrading plasmonic signals and limiting its applications. To circumvent this problem, we report the facile synthesis of superstable AgCu@graphene (ACG) nanoparticles (NPs). The growth of several layers of graphene onto the surface of AgCu alloy NPs effectively protects the Ag surface from contamination, even in the presence of hydrogen peroxide, hydrogen sulfide, and nitric acid. The ACG NPs have been utilized to enhance the unique Raman signals from the graphitic shell, making ACG an ideal candidate for cell labeling, rapid Raman imaging, and SERS detection. ACG is further functionalized with alkyne-polyethylene glycol, which has strong Raman vibrations in the Raman-silent region of the cell, leading to more accurate colocalization inside cells. In sum, this work provides a simple approach to fabricate corrosion-resistant, water-soluble, and graphene-protected AgCu NPs having a strong surface plasmon resonance effect suitable for sensing and imaging.
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