Low
Operating Voltage Carbon–Graphene Hybrid E‑textile for
Temperature Sensing
Posted on 2020-06-22 - 13:07
Graphene-coated
polypropylene (PP) textile fibers are presented for their use as temperature
sensors. These temperature sensors show a negative thermal coefficient
of resistance (TCR) in a range between 30 and 45 °C with good
sensitivity and reliability and can operate at voltages as low as
1 V. The analysis of the transient response of the temperature on
resistance of different types of graphene produced by chemical vapor
deposition (CVD) and shear exfoliation of graphite (SEG) shows that
trilayer graphene (TLG) grown on copper by CVD displays better sensitivity
due to the better thickness uniformity of the film and that carbon
paste provides good contact for the measurements. Along with high
sensitivity, TLG on PP shows not only the best response but also better
transparency, mechanical stability, and washability compared to SEG.
Temperature-dependent Raman analysis reveals that the temperature
has no significant effect on the peak frequency of PP and expected
effect on graphene in the demonstrated temperature range. The presented
results demonstrate that these flexible, lightweight temperature sensors
based on TLG with a negative TCR can be easily integrated in fabrics.
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Rajan, Gopika; Morgan, Joseph J.; Murphy, Conor; Torres Alonso, Elias; Wade, Jessica; Ott, Anna K.; et al. (2020). Low
Operating Voltage Carbon–Graphene Hybrid E‑textile for
Temperature Sensing. ACS Publications. Collection. https://doi.org/10.1021/acsami.0c08397