Amino-modified graphene oxide nanoplatelets for photo-thermal and anti-bacterial capability

Yu Wei Cheng, Shih Hsuan Wang, Chi Ming Liu, Ming Yen Chien, Chuan Chih Hsu, Ting Yu Liu

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


In this study, graphene oxide (GO) nanoplatelets have been successfully amino-functionalized by electrostatic absorbed process of poly(diallyldimethylammoniumchloride) (GO-PDDA) and hydrothermal of ammonia solution (AMGO). The characterizations of GO derivative nanoplatelets (GO, GO-PDDA and AMGO nanoplatelets) were evaluated by Raman, X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy and zeta potential. The results show that the zeta potential change is from −51.7 mV (GO) to 29.7 mV (GO-PDDA) and 33.2 mV (AMGO), indicated that the huge charge changing by the amino group modification. A model bacterium, Escherichia coli (E. coli), was used to evaluate the anti-bacterial activity of GO, GO-PDDA and AMGO nanoplatelets. The anti-bacterial activity of AMGO and GO-PDDA nanoplatelets is superior to pristine GO nanoplatelets, owing to the positive charge of amino-modification to capture the negative charge of bacteria cell walls. Especially in AMGO nanoplatelets, it displays the most powerful anti-bacterial capability, due to the higher grafting density of amino functional group (higher zeta potential of AMGO). Furthermore, the photo-thermal test exhibits the temperature of GO derivative nanoplatelets could increase 38-50 °C while exposed in the near-IR laser (808 nm) for 5 min. Combination of physical capturing/splintering and photo-thermal effects for the bacteria, we suggest that amino-functionalized GO nanoplatelets would be anticipated to apply in the anti-bacterial coating and photo-thermal therapy.

Original languageEnglish
Article number125441
JournalSurface and Coatings Technology
Publication statusPublished - Mar 15 2020


  • Amino group modifications
  • Anti-bacterial capability
  • Graphene oxide nanoplatelets
  • Photo-thermal therapy

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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