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            <title xml:lang="en">Influence of ZnO Morphology on the Functionalization Efficiency of Nanostructured Arrays with Hemoglobin for CO2 Capture</title>
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            <idno type="halRefHtml">&lt;i&gt;Crystals&lt;/i&gt;, 2022, 12 (8), pp.1086. &lt;a target="_blank" href="https://dx.doi.org/10.3390/cryst12081086"&gt;&amp;#x27E8;10.3390/cryst12081086&amp;#x27E9;&lt;/a&gt;</idno>
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                <title xml:lang="en">Influence of ZnO Morphology on the Functionalization Efficiency of Nanostructured Arrays with Hemoglobin for CO2 Capture</title>
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                <title level="j">Crystals</title>
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                <term xml:lang="en">ZnO grass-like nanostructures</term>
                <term xml:lang="en">CO 2 physisorption</term>
                <term xml:lang="en">artificial photosynthesis</term>
                <term xml:lang="en">thermal oxidation</term>
                <term xml:lang="en">carbon dioxide</term>
                <term xml:lang="en">ZnO cane-like nanostructures</term>
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              <p>In this study, nanostructured ZnO arrays were synthesized by an accessible thermal oxidation (TO) methodology. The Zn films were chemically etched with nitric acid (HNO3) and then oxidized in a furnace at 500 °C for 5 h. Two different morphologies were achieved by modifying the HNO3 concentration in the etching process: (a) ZnO grass-like nanostructures and (b) rod-like nanostructures, with an etching process in HNO3 solution at 2 and 8 M concentration, respectively. The physical and chemical properties of the samples were analyzed by X-ray diffraction (XRD), scanning (SEM) and transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and Raman spectroscopy. Both morphologies were functionalized with hemoglobin, and a difference was found in the efficiency of functionalization, which was monitored by UV–Vis spectroscopy. The sample with the highest efficiency was the ZnO grass-like nanostructures. Afterward, the capture of carbon dioxide was evaluated by monitoring a sodium carbonate solution interacting with the as-functionalized samples. The evaluation was analyzed by UV–Vis spectroscopy and the results showed a CO2 capture of 98.3% and 54% in 180 min for the ZnO grass-like and rod-like nanostructures, respectively.</p>
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