High surface area nitrogen-functionalized Ni nanozymes for efficient peroxidase-like catalytic activity
Nitrogen-functionalization is an effective means of improving the catalytic performances of nanozymes. In the present work, plasma-assisted nitrogen modification of nanocolumnar Ni GLAD films was performed using an ammonia plasma, resulting in an improvement in the peroxidase-like catalytic performa...
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Veröffentlicht in: | PloS one 2021-10, Vol.16 (10), p.e0257777 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Nitrogen-functionalization is an effective means of improving the catalytic performances of nanozymes. In the present work, plasma-assisted nitrogen modification of nanocolumnar Ni GLAD films was performed using an ammonia plasma, resulting in an improvement in the peroxidase-like catalytic performance of the porous, nanostructured Ni films. The plasma-treated nanozymes were characterized by TEM, SEM, XRD, and XPS, revealing a nitrogen-rich surface composition. Increased surface wettability was observed after ammonia plasma treatment, and the resulting nitrogen-functionalized Ni GLAD films presented dramatically enhanced peroxidase-like catalytic activity. The optimal time for plasma treatment was determined to be 120 s; when used to catalyze the oxidation of the colorimetric substrate TMB in the presence of H.sub.2 O.sub.2, Ni films subjected to 120 s of plasma treatment yielded a much higher maximum reaction velocity (3.7[subset of or equal to]10.sup.-8 M/s vs. 2.3[subset of or equal to]10.sup.-8 M/s) and lower Michaelis-Menten coefficient (0.17 mM vs. 0.23 mM) than pristine Ni films with the same morphology. Additionally, we demonstrate the application of the nanozyme in a gravity-driven, continuous catalytic reaction device. Such a controllable plasma treatment strategy may open a new door toward surface-functionalized nanozymes with improved catalytic performance and potential applications in flow-driven point-of-care devices. |
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ISSN: | 1932-6203 1932-6203 |
DOI: | 10.1371/journal.pone.0257777 |