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ref: -0 tags: surface plasmon resonance voltage sensing antennas PEDOT imaging spectroscopy date: 12-05-2019 16:47 gmt revision:1 [0] [head]

Electro-plasmonic nanoantenna: A nonfluorescent optical probe for ultrasensitive label-free detection of electrophysiological signals

  • Use spectroscopy to measure extracellular voltage, via plasmon concentrated electrochromic effects in doped PEDOT.

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ref: -0 tags: google glucose sensing contact lens date: 04-28-2016 19:41 gmt revision:2 [1] [0] [head]

A contact lens with embedded sensor for monitoring tear glucose level

  • PMID-21257302
  • Metal stack: Ti 10nM / Pd 10nM / Pt 100nm.
  • on a 100um thick PET film.
  • A 30 µL glucose oxidase solution (10 mg/mL) was dropped onto the sensor area.
  • Then the sensor was suspended vertically above a titanium isopropoxide solution in a sealed dish for 6 h to create a GOD/titania sol-gel membrane, just as reported (Yu et al., 2003).
  • After forming the sol-gel membrane, a 30 µL aliquot of Nafion® solution was dropped onto the same area of the sensor, and allowed to dry in air for about 20 min.
  • Yet, the interference rejection from Nafion is imperfect; at 100uM concentrations, glucose is indistinguishable from ascorbic acid + lactate + urea.
  • Sensor drifts to 55% original performance after 4 days: figure 6
    • sensor was stored in a buffer @ 4C.
    • Probably OK for contact lenses, though.