A general method to prepare metal ammonium phosphate nanoflake constructed microspheres

Unitary (Cu, Co, andMg) and multinary (Cu-Co, Cu-Zn, Cu-Mg, Co-Zn, Cu-Co-Mg, Cu-Mg-Zn, and Co-Mg-Zn) metal ammonium phosphate microspheres constructed by nanoflakes growing in all directions can be prepared using almost the same recipe at 80 degrees C for 12 h, resulting from self-assembly of nanoflakes around the bubble-templates at high pH values.