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Electrical conductivity of oxidized-graphenic nanoplatelets obtained from bamboo: effect of the oxygen content

Articles

Journal/Conference:

NANOTECHNOLOGY

Language:

English

Author:

Prias Barragan J. J.; Sangiao S.; De Teresa J. M.; Lajaunie L.; Arenal R.; Ariza Calderon H.; Prieto P.

Experts:

Gross K.

Year:

2016

Volume:

27

Issue:

36

Keywords:

graphenic carbon materials; pyrolysis; nanoplatelets; biomass; electrical conductivity; EELS spectroscopy; HRTEM

The large-scale production of graphene and reduced-graphene oxide (rGO) requires low-cost and eco-friendly synthesis methods. We employed a new, simple, cost-effective pyrolytic method to synthetize oxidized-graphenic nanoplatelets (OGNP) using bamboo pyroligneous acid (BPA) as a source. Thorough analyses via high-resolution transmission electron microscopy and electron energy-loss spectroscopy provides a complete structural and chemical description at the local scale of these samples. In particular, we found that at the highest carbonization temperature the OGNP-BPA are mainly in a sp(2) bonding configuration (sp(2) fraction of 87%). To determine the electrical properties of single nanoplatelets, these were contacted by Pt nanowires deposited through focused-ion-beam-induced deposition techniques. Increased conductivity by two orders of magnitude is observed as oxygen content decreases from 17% to 5%, reaching a value of 2.3 x 10(3) S m(-1) at the lowest oxygen content. Temperature-dependent conductivity reveals a semiconductor transport behavior, described by the Mott three-dimensional variable range hopping mechanism. From the localization length, we estimate a band-gap value of 0.22(2) eV for an oxygen content of 5%. This investigation demonstrates the great potential of the OGNP-BPA for technological applications, given that their structural and electrical behavior is similar to the highly reduced rGO sheets obtained by more sophisticated conventional synthesis methods.