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Paper   IPM / Nano-Sciences / 16101
School of Nano Science
  Title:   Graphene Oxide Papers in Nanogenerators for Self-Powered Humidity Sensing by Finger Tapping
1.  Faezeh Ejehi
2.  Raheleh Mohammadpour
3.  Elham Asadian
4.  Pezhman Sasanpour
5.  Somayeh Fardindoost
6.  Omid Akhavan
  Status:   Published
  Journal: Scientific Reports
  Vol.:  10
  Year:  2020
  Pages:   7312
  Publisher(s):   Scientific Reports
  Supported by:  IPM
Triboelectric nanogenerators (TENGs) ofer an emerging market of self-sufcient 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 fexible 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 870V, and a current density of 1.4 muA.cm-2 has been extracted in vertical contact-separation mode. The all-fexible TENG has been employed as a self-powered humidity sensor to investigate the efect of raising humidity on the output voltage and current by applying mechanical agitation in two forms of using a tapping device and fnger tapping. Due to the presence of superfcial functional groups on the GO paper, water molecules are inclined to be adsorbed, resulting in a considerable reduction in both generated voltage (from 144V to 14V) and current (from 23muA to 3.7muA) within the range of relative humidity of 20the frst suggested sensitive self-powered GO TENG humidity sensor in portable/wearable electronics.

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