Organometallic Synthesis of Colloidal -/-NiAl Nanoparticles and Selective Aluminum Oxidation in -Ni1-xAlxNanoalloys
Mirza, C; Harish, P; Alexander, B; Osama, S; Maurits, WEvdB; Roland, AF
| HERO ID | 857664 |
|---|---|
| In Press | No |
| Year | 2007 |
| Title | Organometallic Synthesis of Colloidal -/-NiAl Nanoparticles and Selective Aluminum Oxidation in -Ni1-xAlxNanoalloys |
| Authors | Mirza, C; Harish, P; Alexander, B; Osama, S; Maurits, WEvdB; Roland, AF |
| Journal | Chemistry of Materials |
| Volume | 19 |
| Page Numbers | 5721 |
| Abstract | A novel soft chemical synthesis of Ni1-xAlxnanoparticles (0.09 x 0.50) by cohydrogenolysis of Ni(cod)2(1) with (AlCp)4(2) or with (Me3N)AlH3(3) in nonaqueous solution is presented (cod 1,5-cyclooctadiene, Cp 1,2,3,4,5-cyclopentadienyl). The treatment of equimolar amounts of 1and 2in mesitylene solution under 3 bar of H2at 150 C gave a brown-black colloidal solution of intermetallic -NiAl particles, characterized by transmission electron microscopy/energy dispersive X-ray analysis (TEM/EDX) and powder X-ray diffraction (XRD). The solution was stable under 3 bar of H2at 150 C for up to 8 h. The -NiAl colloids were treated postsynthesis with 17O-enriched 1-adamantanecarboxylic acid (ACA) as a surface capping group, giving nearly monodisperse -NiAl colloids that were stable under argon at room temperature for weeks. The coordination of ACA at the -NiAl surface was studied by 17O NMR and IR spectroscopy. A series of -Ni1-xAlxsamples with a variety of compositions (x0.50, 0.33, 0.25, 0.17, 0.09) were prepared analogously, and the samples were characterized by means of elemental analysis (ICP), XRD, and TEM/EDX. Air oxidation of -Ni1-xAlxnanoparticles leads to coreshell particles of the type (Al2O3)2Ni1-xAlx-(0.09 x 0.50; x> ). XRD, X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS) analyses showed that the Ni core is protected against oxidation down to an Al content of about 10 atom %. [ABSTRACT FROM AUTHOR] Copyright of Chemistry of Materials is the property of American Chemical Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | ORGANOMETALLIC chemistry; nanoparticles; aluminum; alloys |
| Is Qa | No |