María del Pilar Bernicola , Miquel Madrid-Gimeno , Nerea Murillo-Cremaes , Tommaso Battisti , Neus Lozano , Kostas Kostarelos , Jose A. Garrido , Elena del Corro
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引用次数: 0
Abstract
Electrodes based on nanoporous reduced graphene oxide (rGO) have been developed as the interfacing component in different designs of neural implants in a variety of therapeutic and monitoring applications. The starting graphene oxide (GO) nanosheets lateral dimensions influenced the staking order, roughness and thickness of the derived rGO films, including the formation of nanochannels. Apart from the morphological differences observed, the GO lateral dimension also impacted on the film conductivity, and on the overall electrochemical performance of the rGO electrodes. While electrodes fabricated from nano-scale GO sheets (us-GO) only showed diffusion-limited impedance in the high frequency regime, the electrical response of electrodes from micron-scale GO sheets (L-GO) was limited by diffusion in the whole frequency range due to a less disordered nanoporous film. At 1 kHz, us-GO electrodes, due to their larger capacitance, presented a higher charge injection limit (Qinj.l.) than L-GO electrodes. Due to the higher conductivity of L-GO, electrodes exhibited half the ohmic drop (IR) of electrodes made of us-GO. This work highlights the importance of GO nanosheet engineering to optimize the performance of rGO electrodes in terms of Qinj.l. and IR, two key figures of merit in neuroelectronic applications.
期刊介绍:
DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices.
The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.