Antagonistically Functionalized Diatom Biosilica for Bio-Triboelectric Generators.

Araz Rajabi-Abhari, Jeehee Lee, Rassoul Tabassian, Jong-Nam Kim, Haeshin Lee*, Il-Kwon Oh*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Although biomaterial-based triboelectric nanogenerators (Bio-TENGs) for use in wearable electronics and implantable sensors have been developed, power generation is not suitable for satisfying the basic requirements for practical applications. Here, to greatly enhance output performances of Bio-TENG devices, an antagonistic approach of diatom frustules (DFs) with amine and fluorine chemical functionalizations is reported. The DFs are treated with piranha solution to increase the density of hydroxyl groups and tribo-positive and tribo-negative composite films are designed with antagonistically functionalized DFs. The tribo-positive composites having electron donating functionality consist of aminated DFs and cellulose nanocrystals (CNCs), while the tribo-negative composite is composed of fluorinated DFs and polydimethylsiloxane (PDMS). An antagonistically and chemically functionalized TENG (ACF TENG) with an efficient contact area of 9.6 cm 2 under a force of 8 N and a frequency of 5 Hz exhibits an output voltage of 248 V, a short-circuit current of 16.4 µA, and a power density of 2.01 W m −2, which is 16.6 times higher than a reference (CNC:PDMS) TENG. This study shows a simple antagonistic approach for chemical functionalization as an efficient method to manipulate the tribo-polarity of bio-additives for enhancing power generation of Bio-TENGs.

Original languageEnglish
Article number2107638
JournalSmall
Volume18
Issue20
Number of pages14
ISSN1613-6810
DOIs
Publication statusPublished - May 2022
Externally publishedYes

Keywords

  • antagonistic functionalization
  • bite counters
  • cellulose nanocrystals
  • diatom frustules
  • triboelectric nanogenerators

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