Analytical and Bioanalytical Electrochemistry is an international scientific journal, which is published online every 3 months (since 2009), every 2 months (since 2011) and monthly (since 2018) by Center of Excellence in Electrochemistry, University of Tehran Analytical and Bioanalytical Electrochemistry - 14 11 2022 11 30 Morphology and Oxidation State Dependent Glucose Sensing Properties of Cu-Oxide Nanocrystals 998 1010 698012 EN Carla Jacobs Department of Chemistry, University of the Free State, Bloemfontein 9300, South Africa Elizabeth Erasmus Department of Chemistry, University of the Free State, Bloemfontein 9300, South Africa 0000-0003-0546-697X Journal Article 2022 08 03 Several morphologically different Cu-oxide nanocrystals (cube, exposing only the (100) facets; elongated octahedron, exposing only the (111) facets; normal octahedron, exposing only the (111) facets; rounded octahedron, exposing only the (111) facets; truncated edge cube, exposing the (100), (110), and (111) facets) have been prepared. Mixed oxidation state facets were obtained, with the X-ray Photoelectron Spectroscopy revealing that both Cu^I and Cu^II are present in the samples. The % Cu^I and Cu^II vary for the different morphologies. Morphologies exposing the (111) facet showed the highest % Cu^I present, with the morphologies exposing the (100) facet showing the least amount of Cu^I. The glassy carbon electrode’s surface was modified with these Cu-oxide nanocrystals and their sensing performance for glucose detection was investigated. The limits of detection (LOD) observed for all the Cu-oxide nanocrystal electrodes were < 2 μM. Electrodes modified with Cu-oxide nanocrystals exposing the (111) facets and having more Cu^I present in the sample resulted in better glucose detection limits. https://www.abechem.com/article_698012_aa57eaa9b7a0899dd28c6e66df51ba48.pdf