Refractometric and colorimetric index sensing by a plasmon-coupled hybrid AAO nanotemplate

Kyuyoung Bae, Jungmin Lee, Gumin Kang, Do Sik Yoo, Chang Won Lee, Kyoungsik Kim

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Facile optical sensors capable of measuring a small change in an analyte's refractive index have been highlighted as the demand for environmental and Internet-of-Things (IoT) applications increases. In this work, we demonstrate a large-area refractive index sensor capable of refractometric and colorimetric sensing with a plasmon-coupled hybrid nanotemplate of anodic aluminum oxide (AAO). The nanotemplate enhances the figure-of-merit and sensitivity due to the coupled mode of the Fabry-Perot microcavity and metallic nanosurfaces. The increased mode confinement and interaction between AAO pores and analytes show highly modulated reflection spectra, which enable a refractive index sensitivity up to 348 nm per RIU and a figure-of-merit value up to 27.7. Also, the vivid color change induced from infiltrated analytes allows a colorimetric sensing performance up to RIU/ΔE ∼ 0.006 according to CIELab 1931 analysis. The key features of our device are simultaneous applications to superb dual (refractometric and colorimetric) sensing schemes by the plasmon-coupled hybrid AAO nanotemplate.

Original languageEnglish
Pages (from-to)103052-103059
Number of pages8
JournalRSC Advances
Issue number125
Publication statusPublished - 2015 Nov 17

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)


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