Double-layer capsule of mesoporous ZnO@SnO for sensitive detection of triethylamine.

To overcome obstacles such as low response and poor selectivity of pure ZnO and SnO gas sensors, the ZnO@SnO sensor was synthesized by hydrothermal synthesis. The samples were characterized by XRD, XPS, SEM, HRTEM, N adsorption-desorption and other techniques. The results show that ZnO@SnO forms an n-n-type heterostructure and presents a double-layer capsule with a size of 0.

Hydrangea-like mesoporous WO nanoflowers with crystalline framework for 3-hydroxy-2-butanone sensing.

In this study, a simple and efficient strategy for the construction of hydrangea-like mesoporous WO nanoflowers templated using diblock copolymer PS-PtBA was developed. The nanoflower shows good gas sensing properties, especially for 3-hydroxy-2-butanone (3H-2B), which is the signature metabolite of Listeria monocytogenes (L. monocytogenes).

A colorimetric immunoassay for determination of Escherichia coli O157:H7 based on oxidase-like activity of cobalt-based zeolitic imidazolate framework.

Cobalt-based zeolitic imidazolate framework nanosheets (ZIF-67) with oxidase-like catalytic activities as an immunoprobe were employed to enhance the sensitivity of an immunoassay. ZIF-67 was synthesized via the solvothermal method using 2-methylimidazole and cobalt dichloride as substrates. A colorimetric immunoassay for Escherichia coli (E.

Cable-Like Core-Shell Mesoporous SnO Nanofibers by Single-Nozzle Electrospinning Phase Separation for Formaldehyde Sensing.

In this study, we have developed a simple and efficient single-nozzle electrospinning strategy involving the phase separation of polystyrene and poly(vinylpyrrolidone) to construct cable-like core-shell mesoporous SnO nanofibers. Compared with traditional multi-axial electrospinning approaches to the synthesis of core-shell nanofibers, the single-nozzle electrospinning process requires no complex multi-axial electrospinning setups or post-treatments, just drying and annealing after electrospinning. The obtained SnO nanofibers show promise as a sensing material for formaldehyde at low concentrations, the detection limit being about 1 ppm.