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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
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Transition metals doped ZnS nanocluster for carbon monoxide detection: A DFT study
TL;DR: In this paper , the electronic sensitivity of pristine and transition metals (TM) such as Sc, Ti, V, Cr, Mn, Fe, Co, Ni, and Cu doped in ZnS nanocluster (TM-doped Zn12S12) toward carbon monoxide (CO) molecule was evaluated.
Posted Content
In situ functionalization of graphene
Kyrylo Greben,Sviatoslav Kovalchuk,Ana M. Valencia,Ana M. Valencia,Jan N. Kirchhof,Sebastian Heeg,Philipp Rietsch,Stephanie Reich,Caterina Cocchi,Caterina Cocchi,Siegfried Eigler,Kirill I. Bolotin +11 more
TL;DR: In this article, the authors report an approach to generate, monitor with time resolution, and functionalize the defects without ever exposing them to the ambient by using an energetic Argon plasma and their properties are monitored using Raman spectroscopy.
Journal ArticleDOI
Operability timescale of defect-engineered graphene
TL;DR: In this paper , the change over time of defected sites created in graphene with low-energy electron irradiation is studied both experimentally via micro-Raman spectroscopy for a period of $6\times 10^3$ hours and through molecular dynamics simulations.
Journal ArticleDOI
Surface modification of graphene with functionalized carbenes and their applications in the sensing of toxic gases: a DFT study
Sarah Aldulaijan,Afnan M. Ajeebi,Abdesslem Jedidi,Sabri Messaoudi,N.-E. Raouafi,Adnene Dhouib +5 more
TL;DR: In this article , the adsorption properties of diazomethanes with various functional groups (R = OH (a), OMe (b), OEt (c), OPr (d), CF3 (e), Ph (f)) on pristine graphene were investigated.
References
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Journal ArticleDOI
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