Abstract
Here, we report on carbon nanotube paper-based electroanalytical devices. A highly aligned-carbon nanotube (HA-CNT) array, grown using chemical vapor deposition (CVD), was processed to form bi-layered paper with an integrated cellulose-based Origami-chip as the electroanalytical device. We used an inverse-ordered fabrication method from a thick carbon nanotube (CNT) sheet to a thin CNT sheet. A 200-layered HA-CNT sheet and a 100-layered HA-CNT sheet are explored as a working electrode. The device was fabricated using the following methods: (1) cellulose-based paper was patterned using a wax printer, (2) electrical connection was made using a silver ink-based circuit printer, and (3) three electrodes were stacked on a 2D Origami cell. Electrochemical behavior was evaluated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). We believe that this platform could attract a great deal of interest for use in various chemical and biomedical applications.
Highlights
Paper-based analytical devices (PADs) have emerged as simple, yet powerful, platforms for performing low-cost, disposable, easy-to-use, and rapid analytical tests
highly aligned-carbon nanotube (HA-carbon nanotube (CNT)) sheet as a working electrode and the final assembled paper-based fabricated by the inverse-ordered method
The 100-layered HA-CNT sheet was fabricated by the aforementioned inverse-ordered method (Figure 1) with a pre-patterned, printed, adhesive sheet, and a thicker 200-layered CNT sheet
Summary
Paper-based analytical devices (PADs) have emerged as simple, yet powerful, platforms for performing low-cost, disposable, easy-to-use, and rapid analytical tests. The paper is placed onto a screen-printed electrode where various conductive inks such as Prussian blue, silver, and carbon are used [17,18,19]. These electrode materials combined with paper can play an important role on lowering detection limits and increasing sensitivity
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