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Choi, Baeck B.,Kim, Bethy,Chen, Yiqi,Jiang, Peng The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.2
he progressively improved sensing sensitivity (∆λ<sub>SPR</sub>/∆n, nm/RIU) to detect the refractive index is observed on the SPR platform of an Au-covered epoxy gratings in an increase in potential cycling in a typical three-electrode cell. Here, a DVD-R optical disc was used as a structure template to prepare an Au-covered epoxy gratings, and the newly formed reverse track pitch structure on the epoxy substrate was used as a working electrode directly in aqueous sulfuric acid solution. It is expected that Au reconstruction by potential cycling in sulfuric acid electrolyte increases the packing density of Au atoms in the grain boundary and improves the propagation of electromagnetic waves.
Inverse DVD-R grating structured SPR sensor platform with high sensitivity and figure of merit
Baeck B. Choi,Bethy Kim,Jason Bice,Curtis Taylor,Peng Jiang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The figure of merit (FOM, 1/RIU) 112.34 is achieved in the Au-covered epoxy grating (Au/Epoxy) with theinverse structure of the original track pitch DVD-R. The feasible exfoliation of the cured epoxy resin fromthe Au-covered polycarbonate (PC) gratings (Au/PC) of DVD-R grating creates a narrow deep channelstructure. As well as Au/PC, newly created Au/Epoxy gratings glow beautifully with rainbow-coloredstripes on the surface due to the constructive interference of visible light. The SEM and 3D-AFM imagesshow that the surface distortion of the Au/Epoxy grating is 0.58 (negative) and that of the Au/PC gratingis 0.14 (positive). The Au/Epoxy grating exhibits 872.01 nm/RIU with slightly lower sensitivity than theAu/PC grating (887.59 nm/RIU). However, the Au/Epoxy grating shows a total of 7.76 ± 0.53 nm with up tofull width half maximum (FWHM) for the SPR dip during the detection test, so a high FOM of 112.34 canbe achieved. In addition, the FDTD simulation shows the experimental results as well as the relevantresults of the SPR deep wavelength and FWHM. Finally, the Au/Epoxy grating shows a more pronouncedresonance for methanol concentration measurements than the Au/PC grating due to the high FOM andstrong adhesion between the Au layer and the epoxy substrate.
Baeck B. Choi,Bethy Kim,Yiqi Chen,유성종,조용현,Peng Jiang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
The colloidal Langmuir–Blodgett coating process is used to fabricate Au-covered silica sphere monolayer(Aufilm over silica nanosphere (AuFON)) and study the effects of silica diameter on surface plasmonresonance (SPR) sensing sensitivity. The resulting hexagonal close-packed (HCP) monolayers areprepared with silica sphere diameters of 200, 400, 700, and 1000 nm. In SPR sensing applications, theoptical properties of Au-covered silica sphere monolayer are evaluated by measuring normal-incidencereflection spectra and sensing tests. The high sensitivity (nm/RIU) is observed in silica sphere diameter(1000 > 700 > 400 > 200 nm) and plasmon mode (dipole > Fano resonance (FR) > and high order) whilethe highest sensitivity is 968 nm/RIU (dipole mode, 1000 nm of silica sphere diameter). 3-D FiniteDifference Time Domain (FDTD) simulation shows a sensitivity trend similar to the experimental results.