In
this work, we reported a sensitive, label-free electrochemical
biosensor based on the intrinsic topological insulator (TI) BiSbTeSe2 for potential application in the determination of the HIV
gene. With strong spin–obit coupling, TIs could have robust
surface states with low electronic noise, which might be beneficial
for the stable and sensitive electron transport between the electrode
and electrolyte interface. Under optimized conditions of the biosensors
using BiSbTeSe2, the differential pulse voltammetry (DPV)
peak currents showed a linear relationship with the logarithm of target
DNA concentrations ranging from 1.0 × 10–13 to 1.0 × 10–7 M, with a detection limit of
1.07 × 10–15 M. The sensing assay also displayed
good selectivity and stability after storage at 4 °C for 7 days.
This work provides an effective way to develop biosensors with topological
materials, which have a potential application in the clinical determination
and monitoring field.
Two-dimensional ternary compounds
bismuth oxyhalides (BiO
x
Br
y
) with suitable band
gap and high surface bulk ratio have great potentials for photoelectrochemical
water splitting. Although intensive efforts were devoted to the design
of well-defined nanostructures to optimize the photoreactivity, it
remains a great challenge to improve the light absorption capacity
and charge carrier transfer of the materials. In this work, we developed
a controllable synthesis route to prepare core–shell structured
Bi/BiOBr complexes with abundant conduction channels and active edges
as photoelectrodes. The structure and morphology of the Bi/BiOBr complexes
could be modulated by tuning the thickness of Bi thin film and/or
the oxygen gas flow during the annealing process. Photoelectrochemical
analyses indicated that the photocurrent density of the Bi/BiOBr electrodes
reached up to 0.36 mA cm–2 at −0.4 V versus
reversible hydrogen electrode (RHE) in acid environments, which was
1 order large than that based on pure BiOBr thin film electrodes (0.08
mA cm–2). Our study demonstrates that the controllable
synthesis of Bi/BiOBr core–shell structures may open a new
way for engineering 2D layered ternary compounds materials to develop
novel catalyst devices.
Interferon-γ (IFN-γ) is one of the crucial inflammatory cytokines as an early indicator of multiple diseases. A fast, simple, sensitive and reliable IFN-γ detection method is valuable for early diagnosis...
VSe2 is a typical two-dimensional (2D) transition-metal
dichalcogenide material with various physical properties, such as
ultrahigh electrical conductivity, controversial magnetism, and active
catalytic properties. However, controllable preparation of VSe2 2D structures poses many challenges, and their application
has not yet been developed. Here, we controllably synthesize VSe2 2D flakes on highly oriented pyrolytic graphite (HOPG) using
molecular beam epitaxy. By controlling the growth temperature and
the evaporation rate of the source, we obtained various morphologies
of VSe2 flakes, including single- and multilayers with
triangular and belt shapes. Compared with the triangular structures
of the flakes, the one-dimensional nanobelt structures have a larger
edge density and can provide more catalytic active sites. Hydrogen
evolution reaction results indicate that the belt-shaped VSe2 flakes exhibit superior catalytic performance. Due to the presence
of plenty of edges, the overpotential of the belt-shaped VSe2 is 543 mV at a current density of 1 mA/cm2, which is
much lower than that in the triangular flakes. The VSe2 flakes with a larger edge density are more conductive than the regular
triangular flakes after loading metal atoms due to the efficient dispersion
of the metal atoms. As a result, the multistructure of Co particle-decorated
VSe2 flakes achieves a high catalytic performance with
352 mV overpotential at a current density of 10 mA/cm2,
demonstrating their potential applications in the catalyst field.
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