| abstract |
【Task】 Providing metal oxide two-dimensional or three-dimensional structures using a biomimetic process. [Solution] In the present invention, jack bean-derived Tachinama bean urease (JBU) is used as urease, and due to its template effect, urea is decomposed to produce a two-dimensional or three-dimensional structure composed of metal oxide nanoparticles. According to the present invention, the iron-based oxide is formed in a sheet shape and exhibits superparamagnetism, and the flower-type hierarchical structure exhibits favorable ferromagnetism and exhibits utility as an MRI contrast agent. The titanium-based oxide forms a rutile-type titanium oxide having a high photocatalytic activity at a low temperature of 37 ° C. [Selection] FIG. |