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Dynamic Control Over Electronic Transport in 3D Bulk Nanographene via Interfacial Charging

Dasgupta, Subho and Wang, Di and Kübel, Christian and Hahn, Horst and Baumann, Theodore F. and Biener, Jürgen (2014):
Dynamic Control Over Electronic Transport in 3D Bulk Nanographene via Interfacial Charging.
In: Advanced Functional Materials, 24 (23), WILEY-VCH Verlag GmbH & Co. KGaA, pp. 3494-3500, ISSN 1616301X,
[Online-Edition: http://dx.doi.org/10.1002/adfm.201303534],
[Article]

Abstract

Electrochemical surface charge-induced variation of physical properties in interface-dominated bulk materials is a rapidly emerging field in material science. The recently developed three-dimensional bulk nanographene (3D-BNG) macro-assemblies with ultra-high surface area and chemical inertness offer new opportunities in this area. Here, the electronic transport in centimeter-sized 3D-BNG monoliths can be dynamically controlled via electrochemically induced surface charge density. Specifically, a fully reversible variation in macroscopic conductance up to several hundred percent is observed with ≤1 V applied gate potential. The observed conductivity change can be explained in the light of the electrochemically-induced accumulation or depletion of charge carriers in combination with a large variation in the carrier mobility; the latter, being highly affected by the defect density modulations resulting from the interfacial charge injection, sharply decreases with an increase in defect concentrations. The phenomenon presented in this study is believed to open the door to novel applications of bulk graphene materials such as, for example, low voltage and high power tunable resistors.

Item Type: Article
Erschienen: 2014
Creators: Dasgupta, Subho and Wang, Di and Kübel, Christian and Hahn, Horst and Baumann, Theodore F. and Biener, Jürgen
Title: Dynamic Control Over Electronic Transport in 3D Bulk Nanographene via Interfacial Charging
Language: English
Abstract:

Electrochemical surface charge-induced variation of physical properties in interface-dominated bulk materials is a rapidly emerging field in material science. The recently developed three-dimensional bulk nanographene (3D-BNG) macro-assemblies with ultra-high surface area and chemical inertness offer new opportunities in this area. Here, the electronic transport in centimeter-sized 3D-BNG monoliths can be dynamically controlled via electrochemically induced surface charge density. Specifically, a fully reversible variation in macroscopic conductance up to several hundred percent is observed with ≤1 V applied gate potential. The observed conductivity change can be explained in the light of the electrochemically-induced accumulation or depletion of charge carriers in combination with a large variation in the carrier mobility; the latter, being highly affected by the defect density modulations resulting from the interfacial charge injection, sharply decreases with an increase in defect concentrations. The phenomenon presented in this study is believed to open the door to novel applications of bulk graphene materials such as, for example, low voltage and high power tunable resistors.

Journal or Publication Title: Advanced Functional Materials
Volume: 24
Number: 23
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA
Uncontrolled Keywords: charge transport, hierarchical structures, hybrid materials, transistors, porous materials
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 16 Feb 2015 13:44
Official URL: http://dx.doi.org/10.1002/adfm.201303534
Identification Number: doi:10.1002/adfm.201303534
Funders: The authors acknowledge the financial support by the Deutsche Forschungsgemeinschaft (DFG) under contract HA1344/25-1. , SD and HH also thank the financial support from Helmholtz Gemeinschaft in the form of Helmholtz Virtual Institute VI530. , Work at LLNL was performed under the auspices of the US DOE by LLNL under Contract DE-AC52-07NA27344. , Project 12-ERD-035 was funded by the LDRD Program at LLNL.
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