Abstract
In nanomaterials synthesis, Ostwald ripening is a postsynthetic problem that is one obstacle for common utilization of nanomaterials. Herein, we report an unprecedented Ostwald ripening mechanism resulting from the simple combination of hydrogen peroxide (H2O2) and cetyltrimethylammonium bromide (CTAB)-stabilized gold nanoparticles (AuNPs) at room temperature. In this ripening process, H2O2 redox induces simultaneous dissolution and growth of AuNPs where bromide (Br–) from CTAB helps to form AuBr2– in aqueous solution at room temperature. This understanding will provide basic strategies for advanced designs and development of various nanomaterials.
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