Cadmium-rich CdS nanotubes were directly obtained at the air-water interface by a new photochemical route. Under ultraviolet light irradiation, branch-like lamellas were first formed on the surface of the precursor solution, and then they bent into nanotubes because of the composition difference between the two sides of lamellas during photochemical reactions and sulfur-air reactions.A typical nanotube has one spherical seal and one open end. Most of the cadmium was contained in the tubes and a little was doped in the tube-walls during their formation. Such nanotubes showed higher photocatalytic activity than the corresponding pure CdS nanotubes in the photodegradation of methylene blue because of the existence metal cadmium. This route is green, template/surfactant-free, reproducible and can be extended to prepare other binary compound semiconductor nanostructures containing elements that can react either with air or another gas. Experimental section Preparation of Cd-rich nanotubesIn a typical synthesis, as shown in Scheme 1, a precursor solution composed of 0.

As a new graphene derivative, graphene fluoroxide (GFO) has not been fully studied because of its complex preparation process. In this paper, two simple methods, a modified Hummers' method and an improved method, were adopted to oxidize unsaturated commercial graphite fluoride (GIF) to prepare graphite fluoroxide (GIFO), the precursor of GFO. GFO was finally obtained via liquid-phase ultrasonic exfoliation of GIFO in organic solvents. Multiple spectroscopic techniques were used to characterize GIFO and GFO.The test results indicate that both of the two methods can covalently bond oxygen functional groups to graphene fluoride (GF) sheets successfully, but the modified Hummers' method gives higher yield and oxidizability. The structure of the GFO sheet is confirmed as few-layer by its atomic force microscopy results and transmission electron microscopy images. UV-vis and fluorescence emission measurements suggest that introducing oxygen groups into GF sheets can change their optoelectronic properties.Based on this, GFO with tunable optoelectronic properties might be facilely obtained in large batches through oxidization and liquid-phase exfoliation of unsaturated GIF with different fluorine coverage.

A simple closed system is introduced to construct copolymer microspheres with specific surface groups by low‐power UV irradiation. As an example, poly(MMA‐co‐MAA) microspheres with narrow size distribution were prepared by photo‐initiated dispersion polymerization. Sizes and size distributions of the microspheres were closely related to light intensity, composition of dispersion medium and the concentrations of initiators, stabilizers, and monomers. Many carboxyl groups could be moored on the spheres' surfaces, which enabled the construction of nanostructures on the surface. Many copolymer microspheres with different surface functional groups, such as –NH2, –SH, –OH, etc. could be directly prepared in an ordinary laboratory.

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A simple strategy for preparing the low-κ FPI hybrids with enhanced properties.