The study of ultrasmall metal nanoclusters (NCs, ranging from subnanometer to ca 2 nm) is evidently a quickly evolving field in current nanoscience and nanotechnology research. MetalNCs, typically composed of several to hundreds of metal atoms, have attracted great interest in recent years owing to their unique properties including ultrasmall size and enhanced photoluminescence, together with other properties such as excellent photostability, low toxicity, and good biocompatibility desired for biological applications. This review summarizes recent advances in the field of bio‐related applications of metalNCsmaterials. We highlight the applications of metalNCsfor biosensor development, fluorescent biological imaging, and biomedical research, and finally discuss briefly some current challenges and future work.WIREs Nanomed Nanobiotechnol2013, 5:569–581. doi: 10.1002/wnan.1227 This article is categorized under: Diagnostic Tools > Biosensing Diagnostic Tools > In Vitro Nanoparticle-Based Sensing Diagnostic Tools > In Vivo Nanodiagnostics and Imaging
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