Abstract
We report the fabrication of hierarchical-ordered superstructure Ag2CrO4 with platelet-like morphology via a facile hydrothermal method. Oriented attachment (OA) controlled growth and hierarchical self-assembly of micrometer-sized platelets producing millimeter platelets are designed by autogenous pressure.A growth model is proposed: Ostwald ripening (OR) mechanism is predominant at low autogenous pressure (up to 400 bars), followed by a mixed (OA + OR) growth mode (at 600 bars) and the OA mechanism acts heavily in the high autogenous pressure domain (800 bars). The autogenous pressure is proved to be the key to thermodynamically hinder the OR growth in the initial stage. The difference between the surface energy of each crystal plane leads to the coalescence of the primary octahedral nanocrystals, and the one-dimension growth produces micrometer-size platelet-like crystals. Their self-assembly by sharing [100] crystallographic orientation allows the formation of hierarchical-ordered superstructures.Thanks to their limited particles size in nanoscale domains controlled by preferential growth mechanism, Ag2CrO4 hierarchical-ordered superstructures present an excellent photocatalytic activity for methyl blue under visible-light irradiation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
