Journal ArticleDOI
Defect-engineered graphene chemical sensors with ultrahigh sensitivity
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TLDR
This study revealed that defect engineering in graphene has significant potential for fabricating ultra-sensitive graphene chemical sensors and systematically investigated the mechanism of gas sensing, which indicated that the vacancy defect is a major contributing factor to the enhanced sensitivity.Abstract:
We report defect-engineered graphene chemical sensors with ultrahigh sensitivity (e.g., 33% improvement in NO2 sensing and 614% improvement in NH3 sensing). A conventional reactive ion etching system was used to introduce the defects in a controlled manner. The sensitivity of graphene-based chemical sensors increased with increasing defect density until the vacancy-dominant region was reached. In addition, the mechanism of gas sensing was systematically investigated via experiments and density functional theory calculations, which indicated that the vacancy defect is a major contributing factor to the enhanced sensitivity. This study revealed that defect engineering in graphene has significant potential for fabricating ultra-sensitive graphene chemical sensors.read more
Citations
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Surface functionalization of epitaxial graphene on SiC by ion irradiation for gas sensing application
Priya Darshni Kaushik,Priya Darshni Kaushik,Ivan Gueorguiev Ivanov,Pin-Cheng Lin,Gurpreet Kaur,Jens Eriksson,G.B.V.S. Lakshmi,D.K. Avasthi,Vinay Gupta,Anver Aziz,Azher M. Siddiqui,Mikael Syväjärvi,G. Reza Yazdi +12 more
TL;DR: In this paper, surface functionalization of epitaxial graphene grown on silicon carbide was performed by ion irradiation to investigate their gas sensing capabilities, and the surface morphology of irradiated graphene layers showed graphene folding, hillocks, and formation of wrinkles at highest fluence.
Journal ArticleDOI
Efficient hydrogen production from ethanol steam reforming over layer-controlled graphene-encapsulated Ni catalysts
TL;DR: In this paper, a graphene-encapsulated Ni nanoparticles (Ni@Gr) were fabricated via in-situ growth method to decrease the graphene layer number, and an approach to fabricate defects on the graphene surface was presented.
Journal ArticleDOI
Optical response and gas sequestration properties of metal cluster supported graphene nanoflakes
TL;DR: The metal clusters lower the Fermi levels of the host nanoflakes and enable them to exhibit reasonably good optical response properties such as polarizability and static first hyperpolarizability, and the dynamic stability of M3O(+)@GR/B GR/BNGR moieties is confirmed.
Journal ArticleDOI
Fabrication of piezoresistive based pressure sensor via purified and functionalized CNTs/PDMS nanocomposite: Toward development of haptic sensors
Saman Azhari,Amin Termeh Yousefi,Hirofumi Tanaka,Amin Khajeh,Nico Kuredemus,Mani Mansouri Bigdeli,Mohd Nizar Hamidon +6 more
TL;DR: In this paper, a chemically modified technique via screen printing method was used to fabricate carbon nanotubes (CNTs)/Polydimethylsiloxane (PDMS) nanocomposite to monitor the piezoresistive behavior of nanocomposition while applying pressure.
References
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