Sensing characteristics of dopamine using Pt/n-Si structure

Anisha Roy, Siddheswar Maikap, Pei Jer Tzeng, Jiantai Timothy Qiu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Dopamine sensing using a simple Pt/n-Si structure is investigated for the first time. Polycrystalline Pt membrane with a thickness of 3 nm in Pt/n-Si structure is observed by high-resolution transmission electron microscope image. This Pt/n-Si structure shows a good pH sensitivity of 0.58/pH by measuring current-time response at pH values from 2 to 10. Repeatable and stable sensing of dopamine with a low concentration of 10 pM are obtained. Dopamine with long concentration range of 10 pM to 1 μM is measured and the sensing mechanism is due to Schottky barrier height modulation through reduction-oxidation of Pt membrane in contact of dopamine. This study is useful for future early diagnosis of Parkinson's disease.

Original languageEnglish
Article number109050
JournalVacuum
Volume172
DOIs
Publication statusPublished - Feb 2020
Externally publishedYes

Keywords

  • Dopamine
  • Platinum (Pt) membrane
  • Reduction-oxidation
  • Schottky contact
  • Sensor

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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