1-D
nanostructured metal oxides exhibit high selectivity having
efficient catalytic trends toward a number of analytes. Tungsten oxide
(WO3) is known for its catalytic properties, conductivity,
and stability, which can be further enhanced by doping. This study
deals with the synthesis of hafnium-doped tungsten oxide (Hf.WO3) nanorods via a hydrothermal process and their characterizations
using X-ray diffraction, transmission electron microscopy, scanning
and transmission electron microscopy, and X-ray photoelectron spectroscopy.
The materials developed were used to fabricate an electrochemical
sensor by modifying the carbon paste electrode (CPE), which was utilized
to estimate paracetamol (PAR) and salbutamol (SBM) drugs. The results
showed enhanced peak current compared to the nascent CPE, indicating
facile transfer of the electrons. The catalytic properties, conductive
nature, and broad surface area of the prepared 1-D nanostructures
have shown remarkable improvement to detect the chosen analytes. A
square wave voltammetric technique was also used to estimate detection
limits of 1.28 × 10–9 and 2.42 × 10–9 M for PAR and SBM, respectively. The estimation of
PAR and SBM in biological samples and pharmaceutical doses of the
drugs demonstrated the usefulness of the sensor device for real analytical
applications.
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