Filamentous fungi can synthesize a variety of nanoparticles (NPs), a process referred to as mycosynthesis that requires little energy input, do not require the use of harsh chemicals, occurs at near neutral pH, and do not produce toxic byproducts. While NP synthesis involves reactions between metal ions and exudates produced by the fungi, the chemical and biochemical parameters underlying this process remain poorly understood. Here, the role of fungal species and precursor salt on the mycosynthesis of zinc oxide (ZnO) NPs is investigated. This data demonstrates that all five fungal species tested are able to produce ZnO structures that can be morphologically classified into i) well‐defined NPs, ii) coalesced/dissolving NPs, and iii) micron‐sized square plates. Further, species‐dependent preferences for these morphologies are observed, suggesting potential differences in the profile or concentration of the biochemical constituents in their individual exudates. This data also demonstrates that mycosynthesis of ZnO NPs is independent of the anion species, with nitrate, sulfate, and chloride showing no effect on NP production. These results enhance the understanding of factors controlling the mycosynthesis of ceramic NPs, supporting future studies that can enable control over the physical and chemical properties of NPs formed through this “green” synthesis method.

Mycosynthesis of ZnO Nanoparticles In article number 2205799, George D. Bachand and co‐workers describe a species dependency in the synthesis of ZnO nanoparticles, resulting in the formation of three distinct morphologies. These morphologies may be related to differences in the biochemical composition of the exudates including organic acids and proteins that control the nucleation and growth of nanoparticles. (Cover art by Christopher Lynne, christopher@visualizetorealize.com.)