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Effect of Synthesis Techniques on Crystallization and Optical Properties of Ag-Cu Bimetallic Nanoparticles

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Abstract

Silver (Ag)-copper (Cu) bimetallic nanoparticles (NPs) were synthesized by the reduction of silver nitrate and copper (II) acetate monohydrate using ethylene glycol in a microwave (MW) heating system with controlled reaction times ranging from 5 min to 30 min. The molar ratio Ag/Cu was varied from 1:1 to 1:3. The effect of reaction conditions on the bimetallic NPs structures and compositions were characterized by x-ray photoelectron spectroscopy, x-ray diffraction and transmission electron microscopy. The average particle size was approximately 150 nm. The surface plasmon resonance (SPR) of Ag-Cu bimetallic NPs was investigated by monitoring the SPR band peak behavior via UV/Vis spectrophotometry. The resonance peak positions and peak widths varied due to the different structures of the bimetallic NPs created under the synthesis conditions. In the MW heating method, the reduction of Cu was increased and Cu was inhomogeneously deposited over the Ag cores. As the composition of Cu becoming higher in the Ag-Cu bimetallic NPs, the absorption between 400 nm to 600 nm was greatly enhanced.

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Acknowledgement

Jung-Kun Lee acknowledges the support from National Science Foundation (Grant Nos. NSF CMMI-1333182, EPMD-1408025).

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Authors and Affiliations

  1. Department of Mechanical Engineering & Materials Science, University of Pittsburgh, Pittsburgh, PA, 15261, USA

    Ziye Xiong, Fen Qin, Po-Shun Huang, Ian Nettleship & Jung-Kun Lee

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  1. Ziye Xiong
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  2. Fen Qin
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  3. Po-Shun Huang
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  4. Ian Nettleship
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  5. Jung-Kun Lee
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Correspondence to Jung-Kun Lee.

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Xiong, Z., Qin, F., Huang, PS. et al. Effect of Synthesis Techniques on Crystallization and Optical Properties of Ag-Cu Bimetallic Nanoparticles. JOM 68, 1163–1168 (2016). https://doi.org/10.1007/s11837-015-1757-1

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  • DOI: https://doi.org/10.1007/s11837-015-1757-1

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