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Single material thermocouples from graphite traces: Fabricating extremely simple and low cost thermal sensors

Rafiq Mulla, Charlie Dunnill Orcid Logo

Carbon Trends, Volume: 4, Start page: 100077

Swansea University Authors: Rafiq Mulla, Charlie Dunnill Orcid Logo

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Abstract

Thermocouples are a universal type of thermal sensors routinely used in different applications for the measurement and monitoring of temperature. Traditionally, they are constructed from two dissimilar conductors. In this work, single material thermocouples are fabricated using graphite pencil trace...

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Published in: Carbon Trends
ISSN: 2667-0569
Published: Elsevier BV 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa57193
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Abstract: Thermocouples are a universal type of thermal sensors routinely used in different applications for the measurement and monitoring of temperature. Traditionally, they are constructed from two dissimilar conductors. In this work, single material thermocouples are fabricated using graphite pencil traces patterned on cellulose paper. The different magnitudes of the Seebeck coefficients in different grade pencils facilitate successful construction of a graphite‐only thermocouple sensor. These extremely simple, low-cost, and eco-friendly thermocouple sensors have shown stable and reliable sensitivity of 7.4 (±0.3) µVK−1, indicating a good temperature resolution of better than 0.2 K. With the advantage of simple and solvent-free fabrication process, such devices can be developed as cheap, environmentally friendly, and disposable thermal sensors.
Keywords: Thermocouple, single metal thermocouple, graphite trace, pencil thermocouple, temperature sensor
College: College of Engineering
Funders: Authors are thankful to the Welsh Government (EU European Regional Development Fund) for funding the RICE (Reducing Industrial Carbon Emission) project (Grant Number: 81435). Authors would like to acknowledge the assistance provided by Swansea University College of Engineering AIM Facility, which was funded in part by the EPSRC (EP/M028267/1), the European Regional Development Fund through the Welsh Government (80708) and the Ser Solar project via Welsh Government.
Start Page: 100077