Biogenic Metal Oxides.

Biogenic metal oxides (MO) feature structures as highly functional and unique as the organisms generating them. They have caught the attention of scientists for the development of novel materials by biomimicry. In order to understand how biogenic MO could inspire novel technologies, we have reviewed examples of all biogenic MO, as well as the current state of understanding of the interactions between the inorganic MO and the biological matter they originate from and are connected to. In this review, we first summarize the origins of the precursors that living nature converts into MO. From the point-of-view of our materials chemists, we present an overview of the biogenesis of silica, iron and manganese oxides, as the only reported biogenic MO to date. These MO are found across all five kingdoms (bacteria, protoctista, fungi, plants and animals). We discuss the key molecules involved in the biosynthesis of MO, the functionality of the MO structures, and the techniques by which the biogenic MO can be studied. We close by outlining the biomimetic approaches inspired by biogenic MO materials and their challenges, and we point at promising directions for future organic-inorganic materials and their synthesis.