Metal Oxide Mesocrystal, and Method for Producing Same

Abstract

Various metal oxide mesocrystals can be synthesized in a simple manner by a method for producing a metal oxide mesocrystal, the method comprising the step of annealing an aqueous precursor solution comprising one or more metal oxide precursors, an ammonium salt, a surfactant, and water at 300 to 600° C. Composite mesocrystals consisting of a plurality of metal oxides or an alloy oxide can also be provided.

1 - 14 . (canceled) 
     
     
         15 . A metal oxide mesocrystal consisting of at least one member selected from the group consisting of zinc oxide, nickel oxide, copper oxide, iron oxide, cobalt oxide, zirconium oxide, and cerium oxide, the mesocrystal having a specific surface area of 0.5 m 2 /g or more. 
     
     
         16 . The metal oxide mesocrystal according to  claim 15 , which has an average width of 0.01 to 1000 μm. 
     
     
         17 . The metal oxide mesocrystal according to  claim 15 , which has an average pore size of 2 to 60 nm. 
     
     
         18 . The metal oxide mesocrystal according to  claim 15 , which has a structure in which nanoparticles or nanocrystals are regularly arranged. 
     
     
         19 . The metal oxide mesocrystal according to  claim 15 , wherein uniform lattice fringes were clearly observed when the metal oxide mesocrystal is observed by electron microscopy. 
     
     
         20 . The metal oxide mesocrystal according to  claim 15 , wherein an average particle size of the metal oxide nanocrystals that constitute the mesocrystal is 5 to 60 nm. 
     
     
         21 . The metal oxide mesocrystal according to  claim 15 , wherein the metal oxide is zinc oxide. 
     
     
         22 . The metal oxide mesocrystal according to  claim 15 , wherein the metal oxide is nickel oxide. 
     
     
         23 . The metal oxide mesocrystal according to  claim 15 , wherein the metal oxide is copper oxide 
     
     
         24 . A metal oxide mesocrystal comprising two or more metals, the mesocrystal having a specific surface area of 0.5 m 2 /g or more, and the metal being at least two members selected from the group consisting of titanium, zinc, nickel, copper, iron, cobalt, zirconium, and cerium. 
     
     
         25 . The metal oxide mesocrystal according to  claim 24 , which has a structure in which metal oxide nanocrystals of the metal are regularly arranged. 
     
     
         26 . The metal oxide mesocrystal according to  claim 25 , wherein an average particle size of the metal oxide nanocrystals that constitute the mesocrystal is 5 to 60 nm. 
     
     
         27 . The metal oxide mesocrystal according to  claim 24 , which has a structure in which alloy oxide nanocrystals of the metal are regularly arranged. 
     
     
         28 . The metal oxide mesocrystal according to  claim 27 , wherein an average particle size of the alloy oxide nanocrystals that constitute the mesocrystal is 5 to 60 nm. 
     
     
         29 . The metal oxide mesocrystal according to  claim 24 , which has an average pore size of 20 to 60 nm. 
     
     
         30 . The metal oxide mesocrystal according to  claim 24 , wherein uniform lattice fringes are clearly observed when the metal oxide mesocrystal is observed by electron microscopy.