Synthesis of cobalt nanoparticles on Si (100) by swift heavy ion irradiation

Attri, Asha; Kumar, Ajit; Verma, Shailendra Kumar; Ojha, Sunil; Asokan, K.; Nair, Lekha

doi:10.1186/1556-276x-8-433

Cited by 14 publications

(9 citation statements)

References 26 publications

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“… 9 Irradiation with a 100 MeV O 7+ ion on the same Co films results in uniform globular nanostructures of similar sizes, but this occurs at much lower fluence values than that for the 100 keV Ar + irradiation. 8 Similar behavior was also reported for Sn and Ni films on silicon substrates. 10 …”

Section: Introductionsupporting

confidence: 76%

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Swift Heavy Ion-Induced Reactivity and Surface Modifications in Indium Thin Films

2022

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As an energetic ion traverses a target material, it loses its energy through the processes of electronic energy loss ( S e ) and nuclear energy loss ( S n ). Controlled swift heavy ion (SHI) irradiation on solid targets produces its effects through both of these mechanisms, as a consequence of which modifications occur in the structure, surface morphology, and magnetic and optical properties, apart from ion implantation and ion-induced reactivity. A systematic investigation of these effects can be useful in developing standard protocols for creating desired effects in materials using specific ion beams. In this study, indium films of thickness 25 nm were deposited on silicon substrates and were subjected to 100 MeV O 7+ and 100 MeV Si 7+ ion irradiation, with the fluences varying from 1 × 10 11 to 1 × 10 13 ions/cm 2 . The pristine and SHI-irradiated films were then characterized using glancing incidence X-ray diffraction (GIXRD), Rutherford backscattering spectrometry (RBS), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The motive was to identify the effects of irradiation with different ion species having large variations in electronic and nuclear energy losses. While the RBS results suggest that sputtering is extremely low and that there are no major changes in the film composition due to ion beam-induced mixing, the GIXRD analysis indicates that increasing the ion fluence reduces the crystallinity of the film for both the ions. Ion beam irradiation with O 7+ ions, however, results in beam-induced reactivity, as the GIXRD scan shows characteristic peaks from indium oxide (In 2 O 3 ), which become the predominant peaks at the highest fluence used here. Si 7+ ion irradiation results in a narrowing of the particle size distribution on the surface, with no evidence of reactivity. SEM results indicate fusion and fragmentation of grains with the increase in the ion fluences, and AFM images reveal an increase in the surface roughness of a few percent when irradiated with both 100 MeV O 7+ and 100 MeV Si 7+ ions.

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Section: Introductionsupporting

confidence: 76%

“… 6 , 7 This has motivated our experiments to establish protocols for the development of desired types of metal nanostructures on substrates. 8 − 10 …”

Section: Introductionmentioning

confidence: 99%

Swift Heavy Ion-Induced Reactivity and Surface Modifications in Indium Thin Films

2022

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“…If the atoms that ejected out from surfaces of NWs are large in number, then diameters of NWs would be reduced. If energetic ions which are interacting with NWs have energy in keV range, then nuclear collision would be dominant and atoms would be ejected out due to collision cascade effects [24,25]. The ejection of atoms from surfaces of NWs is also verified through thinning of diameters of NWs after exposure of NWs to low energy (keV) Ar + ions in TEM images of figures 1(a)-(d).…”

Section: Resultsmentioning

confidence: 84%

Modification in properties of Ni-NWs meshes by Ar⁺ ions beam irradiation

Honey

Asim

Ahmad

et al. 2020

Mater. Res. Express

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Influence of 30 kilo-electron-volt (keV) Argon (Ar + ) ions on optical and electrical properties of nickel nanowires (Ni-NWs) meshes is being reported. Ni-NWs are being exposed to 30 keV Argon (Ar + ) ions at various beam fluencies. These fluencies of Ar + ions are 7×10 14 ions cm −2 , 3×10 15 ions cm −2 and 3×10 16 ions cm −2 . After irradiation, Ni-NWs meshes were analyzed through transmission electron microscopy technique (TEM). The structural analysis has been done through X-ray diffraction technique. It is found from TEM results that atoms are sputtered out from surfaces of Ni-NWs due to collision cascade effect persistently and lead to reduce the diameters or thicknesses of Ni-NWs. X-ray diffraction results reveal that crystalline quality is reduced under Ar + ions irradiation which may be due to defects induced in Ni-NWs as a result of collision cascade effect. The Ni-NWs meshes are characterized optically and electrically through UV-VIS spectroscopy and four probe techniques. The optical transparencies of Ni-NWs meshes are increasing with increase in beam fluence of Ar + ions. The electrical conductivity of the mesh is decreased continuously with increment in beam fluence of Ar + ions which might be due to production of defects in Ni-NWs. The tuning of optical transparency and electrical conductivity of Ni-NWs meshes is required for their application as successful transparent electrodes in optoelectronic nanodevices.

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“…Furthermore, by increasing the implantation dose, the mean size of resultant CoNPs increased while the size distribution showed negligible change. In another study, CoNPs were produced through Li 3+ and O 7+ ions bombardment [77]. First, a 25-nm layer of Co was deposited on n-type silicon (100), and then it was cleaned by acetone-and methanolsonication and subsequent e-beam evaporation.…”

Section: Pure Cobalt Nanoparticlesmentioning

confidence: 99%

Synthesis of cobalt, palladium, and rhenium nanoparticles

2020

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Over the past decade, metal nanoparticles (MNPs) have attracted extensive attention due to their unique physiochemical properties that make them highly applicable in various fields such as chemical sensing, energy storage, catalysis, medicine, and environmental engineering. Their physiochemical properties depend drastically on the MNP size and morphology, which are largely determined by their synthesis methods. Research on MNPs predominantly focused on coinage metals (Au, Ag and Cu), but in the last decade research on metals with a relatively high melting temperature such as Pd, Co, and Re has seen rapid increases, mainly driven by their potential applications as catalysts. This paper presents the recent advances on different synthesis techniques of Co, Pd, and Re nanoparticles, their resulting nanostructures, as well as existing and potential applications.

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Synthesis of cobalt nanoparticles on Si (100) by swift heavy ion irradiation

Cited by 14 publications

References 26 publications

Swift Heavy Ion-Induced Reactivity and Surface Modifications in Indium Thin Films

Swift Heavy Ion-Induced Reactivity and Surface Modifications in Indium Thin Films

Modification in properties of Ni-NWs meshes by Ar⁺ ions beam irradiation

Synthesis of cobalt, palladium, and rhenium nanoparticles

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Synthesis of cobalt nanoparticles on Si (100) by swift heavy ion irradiation

Cited by 14 publications

References 26 publications

Swift Heavy Ion-Induced Reactivity and Surface Modifications in Indium Thin Films

Swift Heavy Ion-Induced Reactivity and Surface Modifications in Indium Thin Films

Modification in properties of Ni-NWs meshes by Ar+ ions beam irradiation

Synthesis of cobalt, palladium, and rhenium nanoparticles

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Product

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Modification in properties of Ni-NWs meshes by Ar⁺ ions beam irradiation