Carbon Nanodots as Feedstock for a Uniform Hematite-Graphene Nanocomposite

Volker Strauss, Mackenzie Anderson, Chenxiang Wang, Arie Borenstein, Richard B. Kaner

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

High degrees of dispersion are a prerequisite for functional composite materials for applications in electronics such as sensors, charge and data storage, and catalysis. The use of small precursor materials can be a decisive factor in achieving a high degree of dispersion. In this study, carbon nanodots are used to fabricate a homogeneous, finely dispersed Fe2O3-graphene composite aerogel in a one-step conversion process from a precursor mixture. The laser-assisted conversion of small size carbon nanodots enables a uniform distribution of 6.5 nm Fe2O3 nanoparticles during the formation of a highly conductive carbon matrix. Structural and electrochemical characterization shows that the features of both material entities are maintained and successfully integrated. The presence of Fe2O3 nanoparticles has a positive effect on the active surface area of the carbon aerogel and thus on the capacitance of the material. This is demonstrated by testing the performance of the composite in supercapacitors. Faradaic reactions are exploited in an aqueous electrolyte through the high accessible surface of the incorporated small Fe2O3 nanoparticles boosting the specific capacitance of the 3D turbostratic graphene network significantly.

Original languageEnglish
Article number1803656
JournalSmall
Volume14
Issue number51
DOIs
StatePublished - 20 Dec 2018
Externally publishedYes

Keywords

  • 3D-graphene
  • carbon nanodots
  • hematite
  • iron oxide nanoparticles
  • pseudo-supercapacitor

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