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Graphene oxide papers in nanogenerators for self-powered humidity sensing by finger tapping

Ejehi, F ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1038/s41598-020-64490-7
  3. Publisher: Nature Research , 2020
  4. Abstract:
  5. Triboelectric nanogenerators (TENGs) offer an emerging market of self-sufficient power sources, converting the mechanical energy of the environment to electricity. Recently reported high power densities for the TENGs provide new applications opportunities, such as self-powered sensors. Here in this research, a flexible graphene oxide (GO) paper was fabricated through a straightforward method and utilized as the electrode of TENGs. Outstanding power density as high as 1.3 W.m−2, an open-circuit voltage up to 870 V, and a current density of 1.4 µA.cm−2 has been extracted in vertical contact-separation mode. The all-flexible TENG has been employed as a self-powered humidity sensor to investigate the effect of raising humidity on the output voltage and current by applying mechanical agitation in two forms of using a tapping device and finger tapping. Due to the presence of superficial functional groups on the GO paper, water molecules are inclined to be adsorbed, resulting in a considerable reduction in both generated voltage (from 144 V to 14 V) and current (from 23 µA to 3.7 µA) within the range of relative humidity of 20% to 99%. These results provide a promising applicability of the first suggested sensitive self-powered GO TENG humidity sensor in portable/wearable electronics. © 2020, The Author(s)
  6. Keywords:
  8. Source: Scientific Reports ; Volume 10, Issue 1 , 2020
  9. URL: https://www.nature.com/articles/s41598-020-64490-7