Electric heating behavior of flexible knitted fabrics comprising reduced graphene oxide, with emphasis on resistance temperature-sensitive behavior and decoupling of contact resistance

Abstract

Electric fabric heaters have demonstrated potential applications in a wide range of fields for medical electrothermal, human healthcare and athletic rehabilitation. Whereas, little attention has been paid to the resistance variations and the interface of electric heaters. Here, this paper focuses on the resistance temperature-sensitive behavior and interfacial electricity of reduced graphene oxide (RGO)/polyester (PET) fabrics, which are obatained through a facile and scalable dip-coating method. When a current of 0.055 ampere (A) is applied, the RGO/PET fabric can achieve an equilibrium temperature about 89 °C in 20 s, with a maximum heating rate of 11.78 °C/s. Besides, the relative resistance changes of RGO/PET fabric are linearly related to the temperature. When the RGO/PET fabric reaches its steady-state temperature of 89 °C, the value of ΔR/R0 drops by ∼30%, showing that the fabric is endowed with temperature sensitivity. These prominent results indicate that the RGO/PET fabric owns great promise in the field of wearable electric heaters. Notably, the contact resistance at the interface of RGO/PET fabric heater is investigated and the mechanism of the temperature in middle part of heater is higher than that of both ends is analyzed. This provides a qualitative decoupling analysis method for the study and analysis of interfacial electricity and electrothermal distribution of carbon materials.

Manganese waste liquid derived MnFe2O4/RGO fabric for microwave blocking, high stable strain and temperature sensing

“…The relative resistance has a well linear relationship with temperature, and its resistance temperature coefficient (TCR) is −0.738 %/°C, indicating that the resistance change is caused by temperature change and capable of temperature sensing. In addition, the change of relative resistance is obvious and TCR is superior to our prior works reported about RGO paper, RGO fabric and Silver Nanowire fabric, 9,16,56 which is helpful for the use as temperature alarm. There are migrating electrons (e m ) in the graphite plane and jumping electrons (e h ) between the graphite layers.…”

“…As a two-dimensional carbon nano material, Graphene has become quite popular owing to its excellent mechanical, electrical, thermal and optical properties. 9–12 Reduced Graphite Oxide (RGO) composed of multilayer graphene is usually prepared by chemical oxidation intercalation, which is widely considered as excellent wave-absorbing material, 9,13 sensing material 14 and green heating material 15,16 ascribed to remarkable characteristics of low density, unique conformability and high dielectric loss compared with the traditional materials, 17 as well as low cost and compared with the monolayer graphene. Wang et al prepared a porous cocoon-like reduced graphene oxide (RGO) by a simple and green reduction reaction using ascorbic acid as the reductant.…”

Experimental design and testing of the electrothermal properties of carbon nanotube film

“…It is well known that the characteristic peak of graphite is usually observed at about 2h ¼ 26 . 29,30 It can be seen from Figure 1(b) that there was a higher and narrower peak at 26 of the CNTF, which was similar to graphite. It indicated that the CNT had low crystallinity and smaller crystal grains.…”

Graphene‐Based Textiles for Thermal Management and Flame Retardancy

“…[91][92] Apart from increasing the graphene content and thermal annealing, other methods to improve the heating performance include repeated coating cycles, [93] hot pressing, [93] optimising the structures of the heating elements, [94] etc. Hong et al [95] fabricated the rGO/PET fabrics through dip-coating, which reaches an equilibrium temperature of ≈89 °C within 20 s under 0.055 A current. In addition to heating ability, an opposite linear trend was found between the resistance and temperature of a rGO/PET heater, suggesting the temperature sensitivity of the textile.…”