Abstract
An explosion in the production of substrates for surface enhanced Raman scattering (SERS) has occurred using novel designs of plasmonic nanostructures (e.g., nanoparticle self-assembly), new plasmonic materials such as bimetallic nanomaterials (e.g., Au/Ag) and hybrid nanomaterials (e.g., metal/semiconductor), and new non-plasmonic nanomaterials. The novel plasmonic nanomaterials can enable a better charge transfer or a better confinement of the electric field inducing a SERS enhancement by adjusting, for instance, the size, shape, spatial organization, nanoparticle self-assembly, and nature of nanomaterials. The new non-plasmonic nanomaterials can favor a better charge transfer caused by atom defects, thus inducing a SERS enhancement. In last two years (2019–2020), great insights in the fields of design of plasmonic nanosystems based on the nanoparticle self-assembly and new plasmonic and non-plasmonic nanomaterials were realized. This mini-review is focused on the nanoparticle self-assembly, bimetallic nanoparticles, nanomaterials based on metal-zinc oxide, and other nanomaterials based on metal oxides and metal oxide-metal for SERS sensing.
Highlights
The strong development of plasmonic nanomaterials for various applications such as photovoltaics [1,2,3,4], optical devices [5,6,7,8,9,10], and biochemical sensors [11,12,13,14,15,16,17] has taken place over these last ten years
Bimetallic nanosystems will be addressed, nanomaterials based on metal-zinc oxide (ZnO), and other nanomaterials based on metal oxides and metal oxide-metal
Recent novelties on plasmonic and non-plasmonic nanomaterials for surface enhanced Raman scattering (SERS) sensing were summarized in four major parts: (i) self-assembly of plasmonic nanoparticles, (ii) bimetallic nanosystems, (iii) nanomaterials based on metal-zinc oxide, and (iv) nanomaterials based on metal oxides and metal oxide-metal
Summary
The strong development of plasmonic nanomaterials for various applications such as photovoltaics [1,2,3,4], optical devices [5,6,7,8,9,10], and biochemical sensors [11,12,13,14,15,16,17] has taken place over these last ten years. They permit the emergence of hotspots placed at the level of the interface of the metal and semiconductor Another possible outcome is based on the zinc oxide (ZnO) nanostructures capped with metallic layer or metallic nanoparticles in order to achieve excellent enhancement factors (EF = 106–1010) [53,54,55,56]. Sharper and stronger characteristics of localized surface plasmon resonances (LSPRs) for the bimetallic systems enable obtaining larger SERS activities due to the hotspots coming from the LSPR coupling between Au and Ag nanosystems [60,61] Another way is to design effective SERS substrates by self-assembling of plasmonic nanoparticles [62,63]. Bimetallic nanosystems will be addressed, nanomaterials based on metal-ZnO, and other nanomaterials based on metal oxides and metal oxide-metal
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