Journal
ACS NANO
Volume 14, Issue 2, Pages 2345-2353Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b09508
Keywords
nanoplasmonics; nanoplasmonic sensor; nanofabrication; 3D; polymer; glass transition temperature; materials science
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Funding
- Knut and Alice Wallenberg Foundation [2016.0210]
- Swedish Foundation for Strategic Research [RMA15-0052]
- European Research Council (ERC) under the European Union [678941/S1NCAT]
- Polish National Science Center Project [2017/25/B/ST3/00744]
- Swedish Foundation for Strategic Research (SSF) [RMA15-0052] Funding Source: Swedish Foundation for Strategic Research (SSF)
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The highly localized sensitivity of metallic nanoparticles sustaining localized surface plasmon resonance (LSPR) enables detection of minute events occurring close to the particle surface and forms the basis for nanoplasmonic sensing. To date, nanoplasmonic sensors typically consist of two-dimensional (2D) nanoparticle arrays and can therefore only probe processes that occur within the array plane, leaving unaddressed the potential of sensing in three dimensions (3D). Here, we present a plasmonic metasurface comprising arrays of stacked Ag nanodisks separated by a thick SiO2 dielectric layer, which, through rational design, exhibit two distinct and spectrally separated LSPR sensing peaks and corresponding spatially separated sensing locations in the axial direction. This arrangement thus enables real-time plasmonic sensing in 3D. As a proof-of-principle, we successfully determine in a single experiment the layer-specific glass transition temperatures of a bilayer polymer thin film of poly(methyl methacrylate), PM/VIA, and poly(methyl methacrylate)/poly(methacrylic acid), P(MMA-MAA). Our work thus demonstrates a strategy for nanoplasmonic sensor design and utilization to simultaneously probe local chemical or physical processes at spatially different locations. In a wider perspective, it stimulates further development of sensors that employ multiple detection elements to generate distinct and spectrally individually addressable LSPR modes.
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