ZnO/SnO2 hetero-nanofibers about 250 nm in diameter and several micrometers in length are synthesized via an electrospun method using zinc chloride and stannous chloride as inorganic sources. All fibers are composed of many nanoparticles (5-10 nm) that induce a highly porous structure as well as high surface area. By adjusting the ratio of zinc/stannous source, the synthesized porous ZnO/SnO2 materials show various structures (corrugated fiber and tube), that are a result of the different oxidation/decomposition temperatures of the two components. Their photodegradation abilities toward various dye wastewaters (methylene blue, congo red, eosin red, and methyl orange) are demonstrated, showing fast photodegradation and good recycling ability. It is noteworthy that ZnO/SnO2 exhibits an enhanced photodegradation ability to congo red, ascribed to the high adsorption capacity derived from the strong electrostatic interaction between ZnO/SnO2 and congo red. Based on the investigation, these porous ZnO/SnO2 hetero-nanofibers possess versatile potential applications for wastewater purification.

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In this work, we have fabricated flower-shaped Ag particles coated with a molecularly imprinted polymer (Ag@MIP) based on the molecular imprinting technique and SERS technology. Although Raman signals decrease with the reducing laser power, Ag@MIP could sensitively detect the target molecules even at a laser power as low as 0.14 μW. As a new SERS substrate, Ag@MIP shows high enhancement under low irradiation effectively, which limits the possible laser induced effects in the measurement process, improving the signal-to-noise ratio and repeatability. This platform has potential for the development of next-generation SERS spectroscopy.