Pico-electrochemistry in humidity-equilibrated electrolyte films on nano-cotton

Three- and four-point probe voltammetry and impedance

Dominic M. Macias, Andrew J. Gross, Soon Yee Liew, Wim Thielemans, John M. Mitchels, Frank Marken

Research output: Contribution to journalArticle

1 Citation (Scopus)
67 Downloads (Pure)

Abstract

Cotton-extracted cellulose nanocrystals are spin-coated from aqueous suspension (0.6 wt%) onto glass slides to give ca. 40 nm thick films. Impregnation with LiCl and redox active Fe(CN)6 3-/4- into this film gives extremely thin redox active layers (typically 170 nm at 60% relative humidity), which were investigated with a 4-point or 3-point probe electrochemical system based on 250 μm diameter platinum wire probes. Both voltammetry and impedance measurements were performed and effects from humidity, concentrations, and time domain on measurements are reported. Only a pico-litre volume under the working electrode was "active" to give a novel electroanalytical "spot test".

Original languageEnglish
Pages (from-to)762-767
Number of pages6
JournalSensors and Actuators B: Chemical
Volume210
Early online date12 Jan 2015
DOIs
Publication statusPublished - Apr 2015

Fingerprint

cotton
Electrochemistry
Voltammetry
electrochemistry
Electrolytes
Cotton
humidity
Atmospheric humidity
electrolytes
impedance
probes
impedance measurement
Platinum
cellulose
chutes
Thick films
Impregnation
Cellulose
Nanocrystals
thick films

Keywords

  • Cellulose nanocrystals
  • Cellulose nanowhiskers
  • Cotton
  • Electroanalysis
  • Ferrocyanide
  • Spot test

Cite this

Pico-electrochemistry in humidity-equilibrated electrolyte films on nano-cotton : Three- and four-point probe voltammetry and impedance. / Macias, Dominic M.; Gross, Andrew J.; Liew, Soon Yee; Thielemans, Wim; Mitchels, John M.; Marken, Frank.

In: Sensors and Actuators B: Chemical, Vol. 210, 04.2015, p. 762-767.

Research output: Contribution to journalArticle

Macias, Dominic M. ; Gross, Andrew J. ; Liew, Soon Yee ; Thielemans, Wim ; Mitchels, John M. ; Marken, Frank. / Pico-electrochemistry in humidity-equilibrated electrolyte films on nano-cotton : Three- and four-point probe voltammetry and impedance. In: Sensors and Actuators B: Chemical. 2015 ; Vol. 210. pp. 762-767.
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