Here, we demonstrate an improvement in sensitivity toward
the NO2 analyte by varying the width ratio of adjacent
graphene oxide
(GO) and reduced graphene oxide (rGO) layers using the GO laser reduction
technique. We evaluated changes brought by laser reduction in material
morphology, structure, electrical characteristics, and sensing performance
depending on the GO/rGO ratio, which we supported by density functional
theory calculations. Our results indicate that the reduction of GO
yields the appearance of a chemiresistive response to NO2. An optimum GO/rGO width ratio ensures high conductivity paired
with good sorption capacity, allowing to achieve chemiresistive response
of 18.1% toward 100 ppm of NO2 at 25 ± 1 °C and
a limit of detection of 230 ppb. The improved chemiresistive response
of GO/rGO sensors upon NO2 physisorption is due to an increase
in sorption energy and improved charge transfer in the presence of
NO2 at the sites corresponding to the individual epoxy
and hydroxyl groups at the GO/rGO interface area when compared to
fully reduced GO.
Here we report a facile one‐pot regioselective synthesis of the family of chiral 1,7‐C60(CF2)(CF3)R compounds via CF2 carbene addition to in situ generated C60CF3− anion. The simplest representative of the family, C60(CF2)(CF3)Me, is unequivocally characterized and shown to feature 0.1 eV lower LUMO level than C60, that makes it a prospective electron accepting electron‐transport material.
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