Abstract
We report Au/Ag bimetallic nanocomposites as a highly sensitive plasmonic material. A unit approach via a three-dimensional numerical modeling is introduced to observe collective plasmon resonance in Au/Ag bimetallic nanocomposites as well as Au mono-metallic nanoensembles. Au nanoensembles provide consistently identical plasmon wavelength, independent of inter-unit distance. In analogy with mono-metallic nanoensembles, Au/Ag bimetallic nanocomposites distinctly feature converging dual plasmon resonance peaks to a single plasmon resonance peak, strongly depending on the packing density and the unit size. An effective unit size of bimetallic nanocomposites is below 2.5 nm in a subwavelength structure, which is small enough to feature bimetallic nanocomposites. As a result, the Au/Ag bimetallic nanocomposites clearly show exceptionally high sensitivity and figure-of-merit (approximately 3-fold of conventional plasmon sensitivity and 4.3-fold of conventional plasmon FOM), resulting from coupled Au-Ag quadrupole bimetallic nanounits. This study provides essential rationales for Au/Ag bimetallic nanocomposites serving as a desirable and alternative plasmonic material for advanced nanoplasmonic-sensing technologies.
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References
Anker JN, Hall WP, Lyandres O, Shah NC, Zhao J, Van Duyne RP (2008) Biosensing with plasmonic nanosensors. Nat Mater 7:442–453. https://doi.org/10.1038/nmat2162
Jiang RB, Li BX, Fang CH, Wang JF (2014) Metal/semiconductor hybrid nanostructures for plasmon-enhanced applications. Adv Mater 26:5274–5309. https://doi.org/10.1002/adma.201400203
Jain PK, Huang XH, El-Sayed IH, El-Sayed MA (2008) Noble metals on the nanoscale: optical and photothermal properties and some applications in imaging, sensing, biology, and medicine. Accounts Chem Res 41:1578–1586. https://doi.org/10.1021/ar7002804
Csaki A, Stranik O, Fritzsche W (2018) Localized surface plasmon resonance based biosensing. Expert Rev Mol Diagn 18:279–296. https://doi.org/10.1080/14737159.2018.1440208
Chung T, Koker T, Pinaud F (2017) Gold nanorod/nanosphere clustering by split-GFP fragment assembly for tunable near-infrared SERS detections. Opt Mater Express 7:3270–3283. https://doi.org/10.1364/ome.7.003270
Mayer KM, Hafner JH (2011) Localized surface plasmon resonance sensors. Chem Rev 111:3828–3857. https://doi.org/10.1021/cr100313v
Li XH, Zhu JM, Wei BQ (2016) Hybrid nanostructures of metal/two-dimensional nanomaterials for plasmon-enhanced applications. Chem Soc Rev 45:3145–3187. https://doi.org/10.1039/c6cs00195e
Han QY et al (2016) Ag-Au alloy nanoparticles: synthesis and in situ monitoring SERS of plasmonic catalysis. Sensors and Actuators B-Chemical 231:609–614. https://doi.org/10.1016/j.snb.2016.03.068
Chung T, Lee SY, Song EY, Chun H, Lee B (2011) Plasmonic nanostructures for nano-scale bio-sensing. Sensors 11:10907–10929. https://doi.org/10.3390/s111110907
Saha K, Agasti SS, Kim C, Li XN, Rotello VM (2012) Gold nanoparticles in chemical and biological sensing. Chem Rev 112:2739–2779. https://doi.org/10.1021/cr2001178
Boltasseva A, Atwater HA (2011) Low-loss plasmonic metamaterials. Science 331:290–291. https://doi.org/10.1126/science.1198258
Diez I, RHA R (2011) Fluorescent silver nanoclusters. Nanoscale 3:1963–1970. https://doi.org/10.1039/c1nr00006c
Herrmann JF, Kretschmer F, Hoeppener S, Hoppener C, Schubert US (2017) Ordered arrangement and optical properties of silica-stabilized gold nanoparticle-PNIPAM core-satellite clusters for sensitive Raman detection. Small 13. https://doi.org/10.1002/smll.201701095
Oh Y, Lee J, Lee M (2018) Fabrication of Ag-Au bimetallic nanoparticles by laser-induced dewetting of bilayer films. Appl Surf Sci 434:1293–1299. https://doi.org/10.1016/j.apsusc.2017.11.245
Kang M, Ahn MS, Lee Y, Jeong KH (2017) Bioplasmonic alloyed nanoislands using dewetting of bilayer thin films. Acs Appl Mater Interfaces 9:37154–37159. https://doi.org/10.1021/acsami.7b10715
Ma PJ, Gao DL, Ni YX, Gao L (2016) Enhancement of optical nonlinearity by core-shell bimetallic nanostructures. Plasmonics 11:183–187. https://doi.org/10.1007/s11468-015-0036-x
Takase M, Sawai Y, Nabika H, Murakoshi K (2011) Detection of adsorption sites at the gap of a hetero-metal nano-dimer at the single molecule level. J Photochem Photobiol A Chem 221:169–174. https://doi.org/10.1016/j.jphotochem.2011.03.021
Kim S, Kim SK, Park S (2009) Bimetallic gold-silver nanorods produce multiple surface plasmon bands. J Am Chem Soc 131:8380−+. https://doi.org/10.1021/ja903093t
Park M, Hwang CSH, Jeong KH (2018) Nanoplasmonic alloy of Au/Ag nanocomposites on paper substrate for biosensing applications. Acs Appl Mater Interfaces 10:290–295. https://doi.org/10.1021/acsami.7b16182
Park M, Kang BH, Jeong KH (2018) Paper-based biochip assays and recent developments: a review. Biochip J 12:1–10. https://doi.org/10.1007/s13206-017-2101-3
Becker J, Zins I, Jakab A, Khalavka Y, Schubert O, Sonnichsen C (2008) Plasmonic focusing reduces ensemble linewidth of silver-coated gold nanorods. Nano Lett 8:1719–1723. https://doi.org/10.1021/nl080720k
Naik GV, Shalaev VM, Boltasseva A (2013) Alternative plasmonic materials: beyond gold and silver. Adv Mater 25:3264–3294. https://doi.org/10.1002/adma.201205076
Auguie B, Barnes WL (2008) Collective resonances in gold nanoparticle arrays. Phys Rev Lett 101. https://doi.org/10.1103/PhysRevLett.101.143902
Juve V et al (2013) Size-dependent surface plasmon resonance broadening in nonspherical nanoparticles: single gold nanorods. Nano Lett 13:2234–2240. https://doi.org/10.1021/nl400777y
Ng KC, Lin FC, Yang PW, Chuang YC, Chang CK, Yeh AH, Kuo CS, Kao CR, Liu CC, Jeng US, Huang JS, Kuo CH (2018) Fabrication of bimetallic Au-Pd-Au nanobricks as an archetype of robust nanoplasmonic sensors. Chem Mater 30:204–213. https://doi.org/10.1021/acs.chemmater.7b04200
Jung I, Kim M, Kwak M, Kim G, Jang M, Kim SM, Park DJ, Park S (2018) Surface plasmon resonance extension through two-block metal-conducting polymer nanorods. Nat Commun 9. https://doi.org/10.1038/s41467-018-03453-z
Stoll T, Maioli P, Crut A, Burgin J, Langot P, Pellarin M, Sánchez-Iglesias A, Rodríguez-González B, Liz-Marzán LM, del Fatti N, Vallée F (2015) Ultrafast acoustic vibrations of bimetallic nanoparticles. J Phys Chem C 119:1591–1599. https://doi.org/10.1021/jp511070h
Chung T, Koker T, Pinaud F (2016) Split-GFP: SERS enhancers in plasmonic nanocluster probes. Small 12:5891–5901. https://doi.org/10.1002/smll.201601631
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This work was supported by Samsung Research Funding Center of Samsung Electronics under Project Number SRFC-IT1402-51 and National Research Foundation of Korea (NRF) Ministry of Science, ICT and Future Planning under Project Number 2018029899.
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Chung, T., Hwang, C.S.H., Ahn, MS. et al. Au/Ag Bimetallic Nanocomposites as a Highly Sensitive Plasmonic Material. Plasmonics 14, 407–413 (2019). https://doi.org/10.1007/s11468-018-0818-z
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DOI: https://doi.org/10.1007/s11468-018-0818-z