Paper-Based Electrochemical Sensors Using Paper as a Scaffold to Create Porous Carbon Nanotube Electrodes

Christopher J. Valentine, Kensuke Takagishi, Shinjiro Umezu, Ronan Daly, Michael De Volder

Research output: Contribution to journalArticlepeer-review

Abstract

Paper-based sensors and assays have evolved rapidly due to the conversion of paper-based microfluidics, functional paper coatings, and new electrical and optical readout techniques. Nanomaterials have gained substantial attraction as key components in paper-based sensors, as they can be coated or printed relatively easily on paper to locally control the device functionality. Here, we report a new combination of methods to fabricate carbon nanotube-based (CNT) electrodes for paper-based electrochemical sensors using a combination of laser cutting, drop-casting, and origami. We applied this process to a range of filter papers with different porosities and used their differences in three-dimensional cellulose networks to study the influence of the cellulose scaffold on the final CNT network and the resulting electrochemical detection of glucose. We found that an optimal porosity exists, which balances the benefits of surface enhancement and electrical connectivity within the cellulose scaffold of the paper-based device and demonstrates a cost-effective process for the fabrication of device arrays.

Original languageEnglish
Pages (from-to)30680-30685
Number of pages6
JournalACS Applied Materials and Interfaces
Volume12
Issue number27
DOIs
Publication statusPublished - 2020 Jul 8

Keywords

  • carbon nanotube electrodes
  • carbon nanotubes
  • electrochemical sensing
  • paper-based sensors
  • porous substrates
  • three-dimensional electrodes

ASJC Scopus subject areas

  • Materials Science(all)

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