Date of Award

6-2022

Document Type

Union College Only

Degree Name

Bachelor of Science

Department

Mechanical Engineering

First Advisor

Yijing Stehle

Keywords

Graphene, Ink, Humidity, Sensor, Printing, Electrode

Abstract

Ultra-thin, flexible, stretchable, and non-toxic sensors attract more and more attention as the need for more controlled non-invasive healthcare monitoring increases. Traditional conductive inks for electrode printing application require the use of metallic nanoparticles that can get very expensive to achieve high sensitivities. Graphene, a highly conductive, flexible, and high surface area material, has a much lower cost that makes it an ideal alternative. The rheological properties of the graphene ink developed allow it to be screen printed and inkjet printed, which allows it to be used in a wider range of applications. In this study, humidity sensors were drop cast with the as-prepared ink followed up with an annealing treatment. Annealing studies showed large increases in conductivity and sensing afterwards. The resulting electrochemical impedance spectra were further analyzed by fitting to an equivalent electrical circuit model showing that the electrode is behaving as predicted. Sensing data taken between high and low humidity environments show clear changes in impedance between them indicating that the electrode has the potential as a humidity sensing product and possibly as a sensor for other VOCs.

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Rights Statement

In Copyright - Educational Use Permitted.