pH-sensing characteristics of multi-walled carbon nanotube sheet

• MWCNT sheets do not require purification, separation and dispersion process.
• MWCNT sheet can be transferred easily another substrates to be used as a sensor.
• Sensitivity of the sensor highly depends on the Ni particle size.
• The mean size of the Ni particles was controlled by the electro-deposition time.

A hybrid nanostructure multi-walled carbon nanotube (MWCNT) sheet decorated with a nickel (MWCNT/Ni) was synthesized for utilization as a pH sensor. Different sizes of Ni particles were coated onto MWCNT sheets by electrodeposition, which is a simple fabrication technique for binary composites. Electrical resistance of the pH sensor increased linearly with an increase in pH value. The performance of the pH sensor was significantly influenced by Ni particle size, which was easily regulated by controlling the electrodeposition time. The measured output characteristics were stable, reliable, and reproducible.

SEM image and photograph of (a) spin-capable CNTs showing good alignment of MWCNTs and (b) fabricated sensor.Figure optionsDownload as PowerPoint slide