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Hierarchical microrings and porous microrings were synthesized through a facile solvothermal method employing CuCl and thiourea as Cu and S source, respectively, and PVP as surfactant. The PVP-dependent experiments show that PVP plays an important role in forming the microrings. A possible growth mechanism based on the Ostwald ripening was proposed. Besides, the photocatalytic abilities of the as-prepared...
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