Forming more and sharper sensing protrusions on graphene-based electrodes through annealing

Yijing Y. Stehle, Hayden Qualls, Rebecca Cortez, Sang Duang, Ivan Vlassiouk

Research output: Contribution to journalArticlepeer-review

Abstract

A better understanding of the microstructure, physicochemical properties, and sensing behavior of an electrode is critical in developing quick, high sensitivity, and robust electrochemical sensors. In this study, a single electrode was fabricated with self-prepared graphene ink through a drop-cast process followed with a subsequent annealing treatment. The graphene ink-based electrodes were characterized through AFM, contact angle, FTIR, impedance spectra, Raman, and SEM to understand annealing treatment effects. The dynamic response of the electrode to humidity, and vapors of ethanol, propanol, or acetone was measured using a four-point probe station in a closed chamber. The annealing treatment increased the conductivity of the electrode and improved its sensing performance by forming more and sharper protrusions on the electrode surface. These unique surface protrusions suggest that the annealed graphene ink-based electrodes hold great potential in developing high-performance electrochemical sensors.

Original languageEnglish
Article number100707
JournalFlatChem
Volume47
DOIs
StatePublished - Sep 2024

Keywords

  • Annealing
  • Electrochemical sensor
  • Electrode
  • Graphene
  • Response time

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