Here we report a new low temperature dry ice carbonation approach for the synthesis of carbonate-based nano- and micro-particulate materials, which enables the preparation of monodispersed calcium carbonate nanoparticles and microspheres with very high purity phases.

In this work, new chiral and luminescent TiO2 nanomaterials are prepared by a single step nonaqueous synthesis. Using circular dichroism spectroscopy it is shown that TiO2 nanoparticles are optically active with almost identical mirror images of one another in the band‐edge region of titanium dioxide. Investigations of the photoluminescence properties reveal a broad shallow trap state emission centered at 440 nm, with a photoluminescence quantum yield of ≈3.5%, which is among the highest reported for TiO2. Electron microscopy reveals the TiO2 nanostructures to be dendritic aggregates measuring 30–50 nm in size composed of smaller nanorods of 3–4 nm in diameter.

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Hybrid structures based on TiO 2 nanoparticles and quantum dots (QDs) are effective electron-transfer systems. Here, we report the results of the investigation of photoinduced electron-transfer efficiency in these multilayered hybrid structures, taking into account the resulting multiexponential PL decay of QDs and ROS generation efficiency by the structures. We demonstrate the inhomogeneity of electron-transfer rate in the structures and discuss some reasons for this phenomenon. In this work, for the first time, we estimate electron-transfer efficiency in the TiO 2 /QDs hybrid structures using ROS generation under visible light. We show that the photoinduced electron transfer is the main reason for QD quenching in hybrid TiO 2 -based nanoparticles and propose a way to improve the efficiency of these structures.

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