Self-assembly of porous copper oxide hierarchical nanostructures for selective determinations of glucose and ascorbic acid. Issue 18 (3rd February 2016)

• Record Type: Journal Article
• Authors: Mahmoud, Bahaa G.; Khairy, Mohamed; Rashwan, Farouk A.; Foster, Christopher W.; Banks, Craig E.
• Is Part Of: RSC advances. Volume 6:Issue 18(2016)
• Page Start: 14474
• Page End: 14482
• Publication Date: 2016-02-03
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra22940e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : CuO with flower and hallow sphere-like morphology were fabricated via one pot hydrothermal method. The effect of copper ions source upon the CuO nanostructures assembly, selectivity and sensitivity in the electrochemical processes is explored. Abstract : The simple design of CuO micro-/nanostructures has recently attracted tremendous interest particularly for the enzyme-less sensing of biological molecules due to their intrinsic electronic and catalytic properties. Consequently attention has been directed to the development of new CuO nanomaterials that have multi-interdisciplinary applications. Herein, we report for the first time the fabrication of hierarchical porous CuO micro-/nanostructures with flower- and hollow sphere-like morphology via a facile hydrothermal method. Our experimental findings clarify that the source of the copper-ions effectively control the assembly of CuO nano-building blocks via the one-step hydrolysis of [Cu(NH3 )4 (H2 O)2 ]SO4 and [Cu(NH3 )4 (H2 O)2 ]Cl2 precursors, which produce hollow sphere and flower-like morphologies for sensitive and selective determination of ascorbic acid and glucose, respectively. Moreover, such unique properties of macro-/mesoporous CuO with defined dimensions and topologies offer minimized diffusive resistance for the dispersion of active sites. The best performance of the glucose and ascorbic sensor can be obtained at +0.55 V in 0.1 M sodium hydroxide solution. The as-prepared CuO modified (drop-casted) screen-printed electrodes (SPE) exhibit a fast electroactive response with high sensitivity within a wide concentration range of glucose and ascorbic acid in real samples. Significantly, the anion-dependent approach might be used to control effectively the expansion and features of other metal oxide micro-/nanostructures.