Abstract
Carbon nanostructures are achieved by bio-waste Allium cepa, L., (onion vulgaris) peels through pyrolysis at 900 °C. They contain dispersed elements derived by their bio-precursors, like Mg, Ca, S, Na, K, and Cu. Here, we report the self-assembly of new Cu flower-shaped nanostructures organized as nano-roses. Remarkably, the nano-roses show rolled-up petals of Cu0 with a high chemical stability in air, exhibiting an intrinsic pure Cu crystalline phase. This suggests the exceptional potentiality to synthesize Cu0 nanostructures with novel physical/chemical properties. The size, morphology, and chemical composition were obtained by a combination of high-resolution scanning electron microscopy, energy dispersive X-ray spectroscopy, energy dispersive X-ray diffraction, and Raman spectroscopy.
Highlights
IntroductionWith the fast development of nanotechnology in the last decades, the realm of nanostructures has unveiled all its beauty, giving unimaginable quantum systems, spanning all fields of physics, chemistry, and biology.The autonomous ordering and self-assembly of atoms and molecules on atomically well-defined surfaces [1], two dimensional (2D) elemental materials such as graphene [2], silicene [3] and all those 2D beyond graphene [4,5,6], including van der Waals 2D heterostructures [7], transition metal dichalcogenides [8], perovskite systems [9,10] and bio-polydopamine composite materials [11] are only a small part of this, inaccessible to naked eye, extraordinary world.The close conjugation between the atomic and nanoscopic scale of materials and their physical properties, mainly derived from the 3D, 2D, 1D, or 0D quantum size confinement [12,13,14], directly takes us into the mechanics applied to nanoscience and its complexity [15,16].Appl
The false color energy dispersive X-ray spectroscopy (EDS) images of C, Ca, K, O, Mg, and S and their corresponding Kα1 and Kα2 shells are shown in Figure 1c–h, whereas Figure 1i shows the intensity of the Lα1, Lα2 and Kα1, Kα2 emission lines as a function of increasing energy for these elements
From the inset, that the presence of chemical species different from carbon can mainly be assigned to impurities, including the Cu Lα1, Lα2 emission lines that are clearly visible at around (0.93–0.95) KeV of energy, as well as the others Kα1, Kα2, and Kα3 less intense around (8.0–8.9) KeV, proving C to be over 80%
Summary
With the fast development of nanotechnology in the last decades, the realm of nanostructures has unveiled all its beauty, giving unimaginable quantum systems, spanning all fields of physics, chemistry, and biology.The autonomous ordering and self-assembly of atoms and molecules on atomically well-defined surfaces [1], two dimensional (2D) elemental materials such as graphene [2], silicene [3] and all those 2D beyond graphene [4,5,6], including van der Waals 2D heterostructures [7], transition metal dichalcogenides [8], perovskite systems [9,10] and bio-polydopamine composite materials [11] are only a small part of this, inaccessible to naked eye, extraordinary world.The close conjugation between the atomic and nanoscopic scale of materials and their physical properties, mainly derived from the 3D, 2D, 1D, or 0D quantum size confinement [12,13,14], directly takes us into the mechanics applied to nanoscience and its complexity [15,16].Appl. With the fast development of nanotechnology in the last decades, the realm of nanostructures has unveiled all its beauty, giving unimaginable quantum systems, spanning all fields of physics, chemistry, and biology. The close conjugation between the atomic and nanoscopic scale of materials and their physical properties, mainly derived from the 3D, 2D, 1D, or 0D quantum size confinement [12,13,14], directly takes us into the mechanics applied to nanoscience and its complexity [15,16].
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