In
this paper, we have developed a simple strategy for the preparation
of hybrid nanocomposites of poly(3,4-ethylenedioxythiophene)–TiO2/ZnO (PZT) and demonstrated its application in a thermoelectric
device. Hierarchical hetero-nanostructured TiO2/ZnO (ZTO)
was prepared by a facile sol–gel process in the presence of
a biocapping agent. PZT was prepared by in situ polymerization of
EDOT in the presence of ZTO. It was characterized by UV–visible,
FT-IR, XRD, Raman, SEM, TEM, and AFM analyses. Results revealed homogeneous
distribution of ZTO with a heterocrystalline phase of wurtzite ZnO/anatase
TiO2 having high density of various defects in the hybrid
nanocomposite. Studies showed that ZTO is excellently interfaced with
highly ordered self-assembled extended π-layers of PEDOT chains,
which could enhance the charge carrier concentration (3.92 ×
1020 cm–3) and charge carrier mobility
(0.83 cm2 V–1 s–1).
Furthermore, we have demonstrated its application as a thermoelectric
material by fabricating the device (Cu/PZT/Cu), which showed low thermal
conductivity of 0.0495 Wm–1K–1, Seebeck coefficient of 19.05 μV K–1, power
factor of 1.28 μW m–1K–2, and figure of merit of 4.8 × 10–3 at ambient
temperature. All of these excellent material properties of PZT suggest
its application as an active material for the fabrication of nanoelectronic
devices with large area.
We have designed a flexible electrochemical
transducer film based
on PEDOT–titania–poly(dimethylsiloxane) (PTS) for the
simultaneous detection of neurotransmitters. PTS films were characterized
using various techniques such as transmission electron microscopy,
scanning electron microscopy, atomic force microscopy, four probe
electrical conductivity, ac-impedance, and thermomechanical stability.
The electrocatalytic behavior of the flexible PTS film toward the
oxidation of neurotransmitters was investigated using cyclic voltammetry
and differential pulse voltammetry. The fabricated transducer measured
a limit of detection of 100 nm ± 5 with a response time of 15
s and a sensitivity of 63 μA mM–1 cm–2. The fabricated transducer film demonstrated for the simultaneous
determination of epinephrine, dopamine, ascorbic acid, and uric acid
with no interference between the analyte molecules. Further, transducer
performance is validated by performing with real samples. The results
suggested that the fabricated flexible PTS transducer with superior
electrocatalytic activity, stability, and low response time can be
explored for the sensing of neurotransmitters and hence can be exploited
at in vitro and in vivo conditions for the early detection of the
various diseases.
Self-assembled polyaniline nanowires stippled graphene nanocomposites (PGPCs) were prepared by in situ polymerisation of aniline in the presence of 3-pentadecylphenyl phosphate (3-PDPP) modified graphene sheets.
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