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Graphene Nanoribbon-Supported PtPd Concave Nanocubes for Electrochemical Detection of TNT with High Sensitivity and Selectivity
journal contribution
posted on 2015-12-15, 00:00 authored by Ruizhong Zhang, Chia-Liang Sun, Yu-Jen Lu, Wei ChenIn this work, PtPd concave nanocubes
anchored on graphene nanoribbons
(PtPd-rGONRs) were successfully fabricated through a hydrothermal
process. The structural characterizations confirmed that PtPd concave
cubes with an average size of around 11 nm have been successfully
synthesized and they are uniformly assembled on the surface of rGONRs.
The electrochemical measurements demonstrated that the PtPd-rGONRs
composite-modified glassy carbon electrode (GCE) shows much enhanced
current signals for TNT reduction, which is 4 and 12-fold higher than
rGONRs and bare glassy carbon electrode, respectively. The PtPd-rGONRs
exhibited a wide linear range for TNT detection from 0.01 to 3 ppm
with the sensing limit of 0.8 ppb. Moreover, the PtPd-rGONRs showed
excellent detection stability for the determination of TNT. Most importantly,
the PtPd-rGONRs-based electrochemical detection platform can be successfully
applied to TNT detection in tap water and real lake water samples.
The present study indicates that graphene nanoribbon-supported nanocrystals
are promising in designing high performance electrochemical sensors
for explosives detection.