NDLI: Stable Cu<sub>2</sub>O nanocrystals grown on functionalized graphene sheets and room temperature H<sub>2</sub>S gas sensing with ultrahigh sensitivity

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Back matter

Back cover

Nanoscale Vol - 5 Issue - 3

Stable Cu₂O nanocrystals grown on functionalized graphene sheets and room temperature H₂S gas sensing with ultrahigh sensitivity

Content Provider	Royal Society of Chemistry (RSC)
Author	Chen, Wei Zhang, Ting Zhou, Lisha Shen, Fangping Tian, Xike Wang, Donghong
Copyright Year	2013
Abstract	Stable Cu2O nanocrystals of around 3 nm were uniformly and densely grown on functionalized graphene sheets (FGS), which act as molecular templates instead of surfactants for controlled nucleation; the distribution density of nanocrystals can be easily controlled by FGS with different C/O ratios. The nanocomposite displays improved stability of the crystalline phase in wet air, which is attributed to finite-size effects that the high-symmetry crystalline phase is to be more stable at smaller size. Meanwhile, we conjecture that the oxygen adsorbed on the interfacial surface prefers to extract electrons from FGS, thus the interfacial bonding also makes a contribution in alleviating the process of corrosion to some extent. More importantly, the Cu2O–FGS nanocomposite based sensor realizes room temperature sensing to H2S with fantastic sensitivity (11%); even at the exposed concentration of 5 ppb, the relative resistance changes show good linearity with the logarithm of the concentration. The enhancement of sensitivity is attributed to the synergistic effect of Cu2O and FGS; on the one hand, surfactant-free capped Cu2O nanocrystals display higher surface activity to adsorb gas molecules, and on the other hand, FGS acting as conducting network presents greater electron transfer efficiency. These observations show that the Cu2O–FGS nanocomposite based sensors have potential applications for monitoring air pollution at room temperature with low cost and power consumption.
Starting Page	1564
Ending Page	1569
Page Count	6
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	5
Issue Number	4
Journal	Nanoscale
DOI	10.1039/c2nr33164k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hydrogen sulfide Oxygen Nucleation Corrosion Graphene Logarithm Air pollution Nanocomposite
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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