Table 1. Size and Chemical Composition for the As-Synthesized NCsa.
| sample | average size of NC as-synthesized (n° of measured NCs) | Cu at.% by ICP | Cu at.% by STEM-EDX | wt % metal load (NM + Cu) | average size after oxidation (n° of measured NCs) | average size after reduction (n° of measured NCs) |
|---|---|---|---|---|---|---|
| Pd50-Cu50 | 5.1 ± 1.5 nm (755) | 53 ± 0.1b | 53.3 ± 1.5b | 1.9 ± 0.2b | 7.8 ± 2.0 nm (86) | 5.9 ± 1.6 nm (133) |
| Pt50-Cu50 | 4.9 ± 1.8 nm (1445) | 51 ± 0.2b | 46.8 ± 0.8b | 2.0 ± 0.1b | 4.7 ± 0.7 nm (201) | 4.9 ± 0.6 nm (151) |
| Pd | 5.2 ± 1.0 nm (1375) | 1.9 ± 0.1b | 5.5 ± 0.8 nm (85) | 5.3 ± 0.8 nm (101) | ||
| Pt | 7.6 ± 1.7 nm (174) | 2.5 ± 0.2b | 11.2 ± 4.8 nm (138) | 8.0 ± 2.2 nm (88) | ||
| Cu | 6.8 ± 1.7 nm (405) | 0.8 ± 0.0b | 26.4 ± 5.9 nm (72) | 18.7 ± 4.4 nm (140) |
a
Metal load obtained from ICP-OES and the size after the two treatments for the mono- and bimetallic alumina supported NCs (NM = noble metal).
b
Standard deviation of four repeated tests.