Synthesis and characterization of Co@Ag core–shell nanoparticles
Source abstract
Abstract
A micellar method has been used to prepare silver-coated cobalt (Co@Ag) nanoparticles. The synthesized particles have been deeply characterized by several methods, i.e., XRD, UV–Vis, TEM, XPS, and electrochemical techniques. There is every indication that the obtained particles show a truly core–shell structure. All the nanoparticles obtained under different conditions are in the size range 3–5 nm. High-resolution TEM (HRTEM), Fast Fourier Transformation (FFT), and Selected Area Electron Diffraction (SAED) indicated that the presence of hcp-Co and fcc-Ag, in which cobalt is located in the central area; meanwhile silver is at the edges of the nanoparticle. The absorption band of the Co@Ag colloid shifts to a longer wavelength and broadens relative to that of pure silver colloid. Voltammetric characterization allowed to determine the coverage of the cobalt core.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electrochemical Analysis and Applications · Electrocatalysts for Energy Conversion · Gold and Silver Nanoparticles Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (26)
Show source-provided references
1. Andres RP, Bein T, Dorogi M, Feng S, Henderson JI, Kubiak CP, Mahoney W, Osifchin RG, Reifenberger R (1996) “Coulomb staircase” at room temperature in a self-assembled molecular nanostructure. Science 272:1323–132510.1126/science.272.5266.1323 ↗
2. Bala T, Arumugam SK, Pasricha R, Prasad BLV, Sastry M (2004) Foam-based synthesis of cobalt nanoparticles and their subsequent conversion to CocoreAgshell nanoparticles by a simple transmetallation reaction. J Mater Chem 14:1057–106110.1039/b315022b ↗
3. Chastain J (1992) Handbook of X-ray photoelectron spectroscopy. Perkin-Elmer Coorp, MN
4. Chuang TJ, Brundle CR, Rice DW (1976) Interpretation of the x-ray photoemission spectra of cobalt oxides and cobalt oxide surfaces. Surf Sci 59:413–42910.1016/0039-6028(76)90026-1 ↗
5. Crisan O, Angelakeris M, Simeonidis K, Kehagias T, Komninou P, Giersig M, Flevaris NK (2006) Structure effects on the magnetism of AgCo nanoparticles. Acta Mater 54:5251–526010.1016/j.actamat.2006.06.053 ↗
6. Ershov BG, Sukhov NL, Janata E (2000) Formation, absorption, spectrum, and chemical reactions of nanosized colloidal cobalt in aqueous solution. J Phys Chem B 104:6138–614210.1021/jp000608u ↗
7. Galuri E, Güldur C, Srivsnnavit S, Osuwan S (1999) CO oxidation by silver cobalt composite oxide. Appl Catal A Gen 182:147–16310.1016/S0926-860X(99)00002-2 ↗
8. Garcia-Bastida AJ, Rivas J, Lopez-Quintela MA, Gonzalez-Penedo A, Traverse A (2005) Synthesis and structural characterization of Co immersed in Ag nanoparticles obtained by successive reactions in microemulsions. Sci Technol Adv Mat 6:411–41910.1016/j.stam.2005.04.005 ↗
9. Gaudry M, Lermé J, Cottancin E, Pellarin M, Prével B, Treilleux M, Mélinon P, Rousset JL, Broyer M (2001) Size and concentration effects in the optical properties of alloyed (AuxAg1-x)n and core-shell (NixAg1-x)n embedded clusters. Eur Phys J D 16:201–20410.1007/s100530170092 ↗
10. Halperin WP (1986) Quantum size effects in metal particles. Rev Mod Phys 58:533–60610.1103/RevModPhys.58.533 ↗
11. Hodak JH, Henglein A, Hartland GV (2000) Coherent excitation of acoustic breathing modes in bimetallic core–shell nanoparticles. J Phys Chem B 104:5053–505510.1021/jp000578v ↗
12. Hoflund GB, Weaver JF, Epling WS (1994a) AgO XPS spectra. Surf Sci Spectra 3(2):163–16810.1116/1.1247779 ↗
13. Hoflund GB, Weaver JF, Epling WS (1994b) Ag2O XPS spectra. Surf Sci Spectra 3(2):157–16210.1116/1.1247778 ↗
14. Hyeon T, Lee SS, Park J, Chung Y, Na HB (2001) Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process. J Am Chem Soc 123:12798–1280110.1021/ja016812s ↗
15. Iglesias-Silva E, Rivas J, León Isidro LM, López-Quintela MA (2007) Synthesis of silver-coated magnetite nanoparticles. J Non-Cryst Solids 353:829–83110.1016/j.jnoncrysol.2006.12.050 ↗
16. Jackson JB, Halas NJ (2001) Silver nanoshells: variations in morphologies and optical properties. J Phys Chem B 105:2743–274610.1021/jp003868k ↗
17. Jiménez VM, Espinós JP, González-Elipe AR (1998) Control of the stoichiometry in the deposition of cobalt oxides on SiO2. Surf Interface Anal 26:62–7110.1002/(SICI)1096-9918(199801)26:1<62::AID-SIA349>3.0.CO;2-R ↗
18. Luo N, Mao L, Jiang L, Zhan J, Wu Z, Wu D (2009) Directly ultraviolet photochemical deposition of silver nanoparticles on silica spheres: preparation and characterization. Mater Lett 63:154–15610.1016/j.matlet.2008.09.033 ↗
19. Lyon JL, Fleming DA, Stone MB, Schiffer P, Williams ME (2004) Synthesis of Fe oxide core/Au shell nanoparticles by iterative hydroxylamine seeding. Nano Lett 4:719–72310.1021/nl035253f ↗
20. Mandal M, Kundu S, Ghosh SK, Panigrahi S, Sau TK, Yusuf SM, Pal T (2005) Magnetite nanoparticles with tunable gold or silver shell. J Colloid Interface Sci 286:187–19410.1016/j.jcis.2005.01.013 ↗
21. Portales H, Saviot L, Duval E, Gaudry M, Cottancin E, Pellarin M, Lermé J, Broyer M (2002) Resonant Raman scattering by quadrupolar vibrations of Ni–Ag core–shell nanoparticles. Phys Rev B 65:16542210.1103/PhysRevB.65.165422 ↗
22. Schlesinger HI, Brown HC, Finholt AE, Gilbreath JR, Hoekstra HR, Hyde EK (1953) Sodium borohydride, its hydrolysis and its use as a reducing agent and in the generation of hydrogen. J Am Chem Soc 75:215–21910.1021/ja01097a057 ↗
23. Schmid G (1994) Clusters and colloids, from theory to applications. VCH, Weinheim10.1002/9783527616077 ↗
24. Schmid G (1998) Metal clusters and colloids. Adv Mater 10:515–52610.1002/(SICI)1521-4095(199805)10:7<515::AID-ADMA515>3.0.CO;2-Y ↗
25. Solla-Gullón J, Montiel V, Aldaz A, Clavilier J (2003) Synthesis and electrochemical decontamination of platinum–palladium nanoparticles prepared by water-in-oil microemulsion. J Electrochem Soc 150(2):E104–E10910.1149/1.1534600 ↗
26. Tourinho FA, Franck R, Massart R (1990) Aqueous ferrofluids based on manganese and cobalt ferrites. J Mater Sci 25:3249–325410.1007/BF00587682 ↗