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

AutorGross, K.; Sangiao, S.; Teresa, José María de; Arenal, Raul; Prieto, Pilar
Palabras claveGraphenic carbon materials
Electrical conductivity
EELS spectroscopy
Fecha de publicación2016
EditorInstitute of Physics Publishing
CitaciónNanotechnology 27(36): 365708 (2016)
ResumenThe 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 bonding configuration (sp 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 10 S m 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.
Identificadoresdoi: 10.1088/0957-4484/27/36/365708
e-issn: 1361-6528
issn: 0957-4484
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