Active accumulation of spherical analytes on plasmonic hot spots of double-bent Au strip arrays by multiple dip-coating

Jinhyung Lee, Eun Ah You, Do Won Hwang, Shinill Kang, Jung Sub Wi

Research output: Contribution to journalArticle

Abstract

To achieve sensitive plasmonic biosensors, it is essential to develop an efficient method for concentrating analytes in hot spots, as well as to develop plasmonic nanostructures for concentrating light. In this study, target analytes were delivered to the surface of double-bent Au strip arrays by a multiple dip-coating method; they were self-aligned in the valleys between neighboring Au strips by capillary forces. As the valleys not only accommodate target analytes but also host strong electromagnetic fields due to the interaction between adjacent strips, sensitive measurement of target analytes was possible by monitoring changes in the wavelength of a localized surface plasmon resonance. Using the proposed plasmonic sensor and target delivery method, the adsorption and saturation of polystyrene beads 100 nm in size on the sensor surface were monitored by the shift of the resonance wavelength. In addition, the pH-dependent stability of exosomes accumulated on the sensor surface was successfully monitored by changing the pH from 7.4 to 4.0.

Original languageEnglish
Article number660
JournalNanomaterials
Volume9
Issue number5
DOIs
Publication statusPublished - 2019 May 1

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Coatings
Sensors
Wavelength
Polystyrenes
Surface plasmon resonance
Biosensors
Electromagnetic fields
Nanostructures
Adsorption
Monitoring

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)

Cite this

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abstract = "To achieve sensitive plasmonic biosensors, it is essential to develop an efficient method for concentrating analytes in hot spots, as well as to develop plasmonic nanostructures for concentrating light. In this study, target analytes were delivered to the surface of double-bent Au strip arrays by a multiple dip-coating method; they were self-aligned in the valleys between neighboring Au strips by capillary forces. As the valleys not only accommodate target analytes but also host strong electromagnetic fields due to the interaction between adjacent strips, sensitive measurement of target analytes was possible by monitoring changes in the wavelength of a localized surface plasmon resonance. Using the proposed plasmonic sensor and target delivery method, the adsorption and saturation of polystyrene beads 100 nm in size on the sensor surface were monitored by the shift of the resonance wavelength. In addition, the pH-dependent stability of exosomes accumulated on the sensor surface was successfully monitored by changing the pH from 7.4 to 4.0.",
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Active accumulation of spherical analytes on plasmonic hot spots of double-bent Au strip arrays by multiple dip-coating. / Lee, Jinhyung; You, Eun Ah; Hwang, Do Won; Kang, Shinill; Wi, Jung Sub.

In: Nanomaterials, Vol. 9, No. 5, 660, 01.05.2019.

Research output: Contribution to journalArticle

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AU - You, Eun Ah

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