This paper develops a novel and convenient approach to deposit poly(3,4ethylenedioxythiophene)-reduced graphene oxide (PEDOT-rGO) hybrid film in aqueous solution through electrochemical process. The PEDOT-rGO film exhibited supperior charge transfer capability with charge transfer resistance of 1333 Ω.cm −2 and standard transfer rate constant of 0.145 s −1 , which makes it a promising material for electrochemical sensing applications. The glassy carbon electrode modified with PEDOT-rGO showed good electrocatalytic performance towards acetaminophen with limit detection of 5.74 μM, linear concentrations ranging from 10 to 60 μM and sensitivity of 23.5 μA.μM −1 .cm −2 . The use of acetaminophen sensor based on PEDOT-rGO in analysing Vietnamese traditional medicaments was demonstrated.

Surface plasmon hybridization provides new perspectives for light manipulation at the nanoscale and related applications in nanophotonics. Multiple hybridization between metallic layers inside plasmonic nanocavities displays properties similar to atomic dressed states. In this Letter, we propose to numerically and analytically investigate the case of a multilayer structure composed of stacked metallic (M) and insulator (I) thin films. For a small number of MIM blocks, the system shows discrete hybridization schemes arising from plasmonic strong coupling. When the number of layers increases, multiple and stronger couplings occur and give birth to new modes which merge to form a plasmonic energy continuum. A schematic diagram of modes construction is presented to help the design of vertical nanocavities with specific properties such as plasmonic guiding.

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Embedding a thin layer of a noble metal between two symmetric media results in the hybridization of the surface plasmons, leading to the existence of a long-range surface plasmon (LRSP). In this Letter, we investigate numerically the coupling of a single dipole, as a probe, to this LRSP. Different de-excitation channels are available such as free space radiation and plasmonic modes in different proportions. In a more realistic approach, with finite layers, guided modes in the dielectric may also be excited. The study of the local density of optical states allows us to separate, identify, and reconstruct the different modes. The critical role of the orientation as well as the position of the dipole leads to an interplay between the LRSP and the guided modes. The coupling efficiency with these modes is evaluated. Besides providing a deep understanding of a LRSP in realistic devices, these results could be used as guidelines for future optoelectronic device designs.