A hybrid nanostructure consisting of ultrathin WO2 nanowires and amorphous carbon layers arranged in an interacting arrangement is successfully synthesized and used as a highly sensitive and stable SERS substrate.
Uniform Au–WO3 porous hollow spheres have been synthesized on a large-scale by a general in situ reaction. The hybrid materials exhibit excellent activity for visible-light photocatalytic degradation of organic pollutants.
Surface-enhanced
Raman scattering (SERS) is regarded as the most
direct and powerful tool to identify chemical fingerprints. However,
current SERS substrate materials still face some critical challenges,
including low molecular utilization efficiency and low selectivity.
Herein, a novel oxygen vacancy heteropolyacidH10Fe3Mo21O51 (HFMO)is developed
as a high-performance volume-enhanced Raman scattering (VERS)-active
platform. Due to its merit of water solubility, HFMO forms a special
coordination bond with the probe molecule at the molecular level,
which allows its enhancing ability to be comparable to that of noble
metals. An enhancement factor of 1.26 × 109 and a
very low detection limit of 10–13 M for rhodamine
6G were obtained. A robust O–N coordination bond was formed
between the anion of HFMO and the probe molecule, resulting in a special
electron transfer path (Mo–O–N) with high selectivity,
which is verified using X-ray photoelectron spectroscopy analysis
and density functional theory calculations. That is to say, the proposed
HFMO platform has excellent VERS enhancing effect, specifically for
the molecules containing the imino group (e.g., methyl blue, detection
limit: 10–11 M), offering the merits of high reproducibility
and uniformity, high-temperature resistance, long-time laser irradiation,
and strong acid resistance. Such an initial effort on the ionic type
VERS platform may enable the further development of highly sensitive,
highly selective, and water-soluble VERS technology.
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