It is an important element as A-site dopant or ingredient in perovskite-type electrodes and catalysts 2, 3, 4. It has a very low electronegativity (1.0), thus tending to be readily ionized as Sr 2+ to react with oxygen and H 2O in air 1. ![]() Strontium is an alkaline earth metal that has two electrons in the outer valence shell. This study paves the way for designing and developing 1D architecture of alkaline earth metal carbonates by a simple method without external additives at room temperature. The anisotropic growth habit is found to be affected by the kinetics of carbonation. X-ray diffraction simulation and transmission electron microscopy identify the preferred-orientation plane of the 1D nanostructures as the (002) plane, i.e., the growth along the c-axis. The existence of intermediate SrHO +–OCO 2 2− phase indicates the interaction of CO 3 2− with SrOH + in Sr(OH) x(H 2O) y cluster to orient strontianite crystals. Water molecules cause not only the exsolution of Sr liquid droplets on the surface but also the uptake of airborne CO 2 followed by its ionization to CO 3 2−. Using in situ Raman spectroscopy, we monitored the structural evolution from hydrated strontium to strontianite nanorods, demonstrating the epitaxial growth by vapor–liquid–solid mechanism. ![]() ![]() Here, we show that trace water also serves an important role in forming and structuring vertically oriented strontianite nanorod arrays on strontium compounds. Basic additives in aqueous strontium solutions is commonly used in controlling strontianite nanostructures. Morphology-controlled strontianite nanostructures have attracted interest in various fields, such as electrocatalyst and photocatalysts.
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