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Type of manuscript: Article
Title: Surface Oxidation of Cu2O Nanoparticles by Adsorbed Ammonia
Special Issue: Synthesis and Application of Antimicrobial Nanomaterials
https://www.mdpi.com/journal/nanomaterials/special_issues/antimicrobial_nano
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Manuscript details:
Journal: Nanomaterials
Manuscript ID: nanomaterials-2054459
Type of manuscript: Article
Title: Surface Oxidation of Cu2O Nanoparticles by Adsorbed Ammonia
Authors: Siwoo Lee, Ji Won Jang, Young Bok Ryu *
Submitted to section: Biology and Medicines,
https://www.mdpi.com/journal/nanomaterials/sections/biology_medicines
Special Issue: Synthesis and Application of Antimicrobial Nanomaterials
https://www.mdpi.com/journal/nanomaterials/special_issues/antimicrobial_nano
Abstract: Copper-based nanoparticles were intensely studied due to their
superior antibacterial activity. Cuprous oxide (Cu2O) was synthesized by two
different methods. Addition of ammonia (NH3) with NaOH and only NaOH method
was used to adjust the morphology of nanoparticles. NH3 sample and NaOH
sample had an octahedron morphology. Crystal structure of the samples was
confirmed by X-ray diffraction. Size distribution/average size of NH3 sample
was narrower/smaller than NaOH sample. Unexpectedly, it is observed that the
antibacterial activity of NH3 was lower than NaOH. Through X-ray
photoelectron spectroscopy and FT-IR, it was revealed that adsorbed NH3 cause
the surface oxidation of Cu2O nanoparticle with azide(N3) formation on
surface.
Keywords: Cu2O nanoparticle; surface analysis; oxidation; antibacterial
activity; ammonia; azide
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