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Fabrication of flexible self-powered humidity sensor based on super-hydrophilic titanium oxide nanotube arrays

Farahani, E ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1038/s41598-020-70031-z
  3. Publisher: Nature Research , 2020
  4. Abstract:
  5. Stable and flexible super-hydrophilic nanotubular-based titanium oxide electrode has been utilized as the active electrode of self-powered humidity sensor. TiO2 nanotubular electrodes fabricated through anodization method and utilized in combination with Kapton electrode as the triboelectric nanogenerator (TENG). Vertical contact-separation mode TENG performance has been examined in various range of frequencies and the maximum output voltage and current more than 300 V and 40 μA respectively with maximum power of 1.25 ± 0.67 mW has been achieved at 4 Hz. The fabricated TENG has been employed as the active self-powered humidity sensor. Super-hydrophilic feature of TiO2 nanotubes resulted in full absorption of water molecules, and noticeable decrease in charge transfer across two triboelectric materials upon increasing humidity. The TiO2-based TENG sensor was exposed to various relative humidity (RH) and the results showed that by increasing the humidity the output voltage and output current decreased from 162.24 ± 35.99 V and 20.4 ± 4.93 μA at RH = 20% to 37.92 ± 1.54 V at RH = 79% and 40.87 88 6.88 ± 1.7 μA at RH = 84%, respectively, Which shows the responsivity more than 300%. This method of measuring humidity has a simple and cost-effective fabrication that has various applications in many fields such as industry and medicine. © 2020, The Author(s)
  6. Keywords:
  8. Source: Scientific Reports ; Volume 10, Issue 1 , 2020
  9. URL: https://www.nature.com/articles/s41598-020-70031-z