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This paper presents a fully inkjet-printed electrochemical sensor on paper which consists of carbon nanotube-printed working, reference, and counter electrodes. The proposed technique aims at low-cost and disposable paper-based electrochemical sensors. First, a carbon nanotube (CNT) ink was inkjet-printed directly on paper, forming a conductive network. Additionally, a hydrophobic barrier was patterned on paper to limit the absorption of liquid to the designed area. The inkjet printing method allows for rapid patterning of electrodes on paper, resulting in a simple and effective electrochemical sensor. The sheet resistance of the CNT-printed paper was as low as 1 k/[?] after 33 prints. A potential step voltammetry method was applied to determine the concentration of the analytes, iron ion (Fe2+) and dopamine (DA), with linear ranges of 10 uM-200 uM and 10 uM-100 uM, respectively. The reported approach for a fully inkjet-printed electrochemical sensor is easy and cheap, and it has a potential for simple and rapid paper-based point-of-care diagnostics.

This work presents inkjet printing of carbon nanotubes on a flexible substrate for a sensor application. An inkjet printed carbon nanotube pattern can be used as a conductive trace or an electrode for a low-cost flexible sensor or a printable electronic device. In this work, an office inkjet printer was modified to print an ink solution made of carbon nanotubes to form conductive patterns on a flexible substrate. Preparation of aqueous carbon nanotube ink was investigated and optimized to achieve good dispersion of carbon nanotubes and high conductance of the printed carbon nanotube patterns. Electrical properties of the printed carbon nanotube pattern were also characterized with a flexible substrate. For a sensor demonstration, the printed carbon nanotube electrode was tested as a working electrode of an electrochemical cell. The results show a promising feasibility for inkjet printed sensor applications.

Microelectrodes for detection of chemicals present several advantages over conventional sized electrodes. However, rapid and low-cost fabrication of microelectrodes is challenging due to high complexity of patterning equipment. We present the development of a low-cost, customizable inkjet printer for printing nanomaterials including carbon nanotubes for the fabrication of microelectrodes. The achieved spatial resolution of the inkjet printer is less than 20 µm, which is comparable to advanced commercially available inkjet printers, with the advantage of being low-cost and easily replicated.

This paper presents a fully inkjet-printed electrochemical sensor on paper which consists of carbon nanotube-printed working, reference, and counter electrodes. The proposed technique aims at low-cost and disposable paper-based electrochemical sensors. First, a carbon nanotube (CNT) ink was inkjet-printed directly on paper, forming a conductive network. Additionally, a hydrophobic barrier was patterned on paper to limit the absorption of liquid to the designed area. The inkjet printing method allows for rapid patterning of electrodes on paper, resulting in a simple and effective electrochemical sensor. The sheet resistance of the CNT-printed paper was as low as 1 kΩ/◻ after 33 prints. A potential step voltammetry method was applied to determine the concentration of the analytes, iron ion (Fe2+) and dopamine (DA), with linear ranges of 10 μM-200 μM and 10 μM-100 μM, respectively. The reported approach for a fully inkjet-printed electrochemical sensor is easy and cheap, and it has a potential for simple and rapid paper-based point-of-care diagnostics.

This work presents inkjet printing of carbon nanotubes on a flexible substrate for a sensor application. An inkjet printed carbon nanotube pattern can be used as a conductive trace or an electrode for a low-cost flexible sensor or a printable electronic device. In this work, an office inkjet printer was modified to print an ink solution made of carbon nanotubes to form conductive patterns on a flexible substrate. Preparation of aqueous carbon nanotube ink was investigated and optimized to achieve good dispersion of carbon nanotubes and high conductance of the printed carbon nanotube patterns. Electrical properties of the printed carbon nanotube pattern were also characterized with a flexible substrate. For a sensor demonstration, the printed carbon nanotube electrode was tested as a working electrode of an electrochemical cell. The results show a promising feasibility for inkjet printed sensor applications.