Nanocap array of Au:Ag composite for surface-enhanced Raman scattering

Zhang, Yongjun; Wang, Jinpeng; Zhong, Hua; Li, Jia; Zhao, Xiaoyu; Wang, Yaxin; Yang, Jing

doi:10.1016/j.saa.2015.07.093

Cited by 29 publications

(17 citation statements)

References 41 publications

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“…Nanosphere lithography (NSL), also known as colloidal lithography, is an inexpensive, simple to implement, inherently parallel, high‐throughput, material general nanofabrication technique capable of producing high‐density plasmonic nanogap arrays . Polystyrene nanospheres could form a closely packed monolayer structure by self‐assembly and act as a mask to construct nanogaps.…”

Section: Fabricationsmentioning

confidence: 99%

“…NSL has been widely used to produce periodic nanogap structures taking advantages of its good reproducibility, fast process, large area, and low cost. In addition, because NSL is a material‐general technique, the deposition materials in multiple deposition experiments need not be the same . Wang et al fabricated a curved Au/Ag metallic nanogap array by NSL .…”

Section: Fabricationsmentioning

confidence: 99%

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Plasmonic Nanogaps: From Fabrications to Optical Applications

Zhang

2018

Adv Materials Inter

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Metallic nanostructures with nanogap features are proved to be highly effective building blocks for plasmonic systems, as they can provide ultrastrong electromagnetic (EM) fields and controllable optical properties. A wide range of fields, including surface enhanced spectroscopy, sensing, imaging, nonlinear optics, optical trapping, and metamaterials, are benefited from these enhanced EM fields. This review outlines the latest development of the fabrication methods for nanogap structures (metal nanoparticle assembly, nanosphere lithography, electron beam lithography (EBL), focused ion beam (FIB) lithography, oblique angle shadow evaporation, edge lithography, and so on), followed by a summary of their optical applications. The present review will inspire more ingenious designs and fabrications of plasmonic nanogap structures with lithography‐free fabrication techniques, and promote their applications in optics and electronics.

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Section: Fabricationsmentioning

confidence: 99%

Section: Fabricationsmentioning

confidence: 99%

Plasmonic Nanogaps: From Fabrications to Optical Applications

Zhang

2018

Adv Materials Inter

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“…The detailed procedures were reported in our previous articles. 24,29,30 The silicon wafers (2 cm Â 2 cm) were boiled in the mixed solution (H 2 O : H 2 O 2 : NH 4 OH ¼ 6 : 2 : 1, volume ratio) at 300 C for 5 minutes, and then they were ultrasonically cleaned with DI water and ethanol for 15 minutes three times, respectively. Hydrophilic silicon wafers were prepared in sodium dodecyl sulfate solution (10%) for 24 h. Aerwards we dropped a droplet (20 mL) of mixed solution (1 : 1 in volume) of ethanol and polystyrene solution onto the hydrophilic silicon wafer.…”

Section: Assemble Of Two-dimensional (2d) Ps Periodic Arraysmentioning

confidence: 99%

Increasing local field by interfacial coupling in nanobowl arrays

et al. 2017

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“…It is commonly accepted that the SERRS process composes two parts: the EM enhancement to the incident laser and the emission enhancement of the scattered photons 12 . As a result, the Raman cross section of a molecule near metallic nanoparticles (NPs) will be enhanced by the fourth power of the EM enhanced factor M 13 , 14 . With such great enhancement to the signal, SERRS can be used to detect samples at extremely low concentrations, even reach the single-molecular level 15 , 16 .…”

Section: Introductionmentioning

confidence: 99%

Density-matrix evaluation of the enhancement to resonant Raman scattering and fluorescence of molecules confined in metallic nanoparticle dimers

Wei

Sun

et al. 2018

Sci Rep

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In the present work we study the surface-enhanced resonant Raman scattering (SERRS) and fluorescence (SEF) spectra of a general model molecule confined in metallic dimers consisting of Ag, Au and hybrid AuAg nanoparticles (NPs). The electromagnetic (EM) enhancement factors were simulated by the generalized Mie scatting method and the scattering cross section of the molecules were obtained by density-matrix calculations. The influence of the size of the NPs and the separation between the dimer on the Raman scattering and fluorescence were systematically studied and analyzed in detail. It was found that the SERRS mainly related to EM enhancement and the SEF depended on the competition between EM enhancement and quantum yield, both of which could be controlled by tuning the radius and separation of the metallic dimers. The optimal radius of the NPs for SERRS were found to be around 30 nm for AgNPs, 40 nm for AuNPs and 50 nm for hybrid AuAgNPs. The strongest Raman enhancement as predicted by the theoretical simulations were 6.2 × 1010, 1.5 × 107 and 5.2 × 108 for the three types of structures, respectively. These results could offer valuable information for the design of metallic substrates for surface enhanced Raman and fluorescence measurements.

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Nanocap array of Au:Ag composite for surface-enhanced Raman scattering

Cited by 29 publications

References 41 publications

Plasmonic Nanogaps: From Fabrications to Optical Applications

Plasmonic Nanogaps: From Fabrications to Optical Applications

Increasing local field by interfacial coupling in nanobowl arrays

Density-matrix evaluation of the enhancement to resonant Raman scattering and fluorescence of molecules confined in metallic nanoparticle dimers

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