Silicon as a ubiquitous contaminant in graphene derivatives with significant impact on device performance

Jalili, A, Esrafilzadeh, D, Aboutalebi, S, Sabri, Y, Esmaiel Zadeh Kandjani, A, Bhargava, S and Della Gaspera, E., et al, 2018, 'Silicon as a ubiquitous contaminant in graphene derivatives with significant impact on device performance', Nature Communications, vol. 9, pp. 1-13.


Document type: Journal Article
Collection: Journal Articles

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Title Silicon as a ubiquitous contaminant in graphene derivatives with significant impact on device performance
Author(s) Jalili, A
Esrafilzadeh, D
Aboutalebi, S
Sabri, Y
Esmaiel Zadeh Kandjani, A
Bhargava, S
Della Gaspera, E., et al,
Year 2018
Journal name Nature Communications
Volume number 9
Start page 1
End page 13
Total pages 13
Publisher Nature Publishing Group
Abstract Silicon-based impurities are ubiquitous in natural graphite. However, their role as a contaminant in exfoliated graphene and their influence on devices have been overlooked. Herein atomic resolution microscopy is used to highlight the existence of silicon-based contamination on various solution-processed graphene. We found these impurities are extremely persistent and thus utilising high purity graphite as a precursor is the only route to produce silicon-free graphene. These impurities are found to hamper the effective utilisation of graphene in whereby surface area is of paramount importance. When non-contaminated graphene is used to fabricate supercapacitor microelectrodes, a capacitance value closest to the predicted theoretical capacitance for graphene is obtained. We also demonstrate a versatile humidity sensor made from pure graphene oxide which achieves the highest sensitivity and the lowest limit of detection ever reported. Our findings constitute a vital milestone to achieve commercially viable and high performance graphene-based devices.
Subject Sensor Technology (Chemical aspects)
Nanomaterials
Physical Chemistry of Materials
DOI - identifier 10.1038/s41467-018-07396-3
Copyright notice © 2018, The Author(s). Creative Commons Attribution 4.0 International License
ISSN 2041-1723
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