Abstract
Rhombic dodecahedral nanocrystals have been considered particularly difficult to synthesize because they are enclosed by {110}, a low-index facet with the greatest surface energy. Recently, we demonstrated the use of seed-mediated growth for the facile and robust synthesis of Au rhombic dodecahedral nanocrystals (AuRD). While the unique shape and surface structure of AuRD are desirable for potential applications in plasmonics and catalysis, respectively, their high surface energy makes them highly susceptible to thermal degradation. Here we demonstrate that it is feasible to greatly improve the thermal stability with some sacrifice to the plasmonic properties of the original AuRD by coating their surface with an ultrathin shell made of Pt. Our in situ electron microscopy analysis indicates that the ultrathin Pt coating can increase the thermal stability from 60 up to 450 °C, a trend that is also supported by the results from a computational study.
| Original language | English |
|---|---|
| Pages (from-to) | 549-556 |
| Number of pages | 8 |
| Journal | Nano Letters |
| Volume | 24 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 17 2024 |
Funding
This work was supported in part by a grant from the NSF (CBET-2219546) and start-up funds from Georgia Tech. We used resources at the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility that is supported by the DOE, Office of Science, under contract no. DE-AC02-05CH11231 using NERSC award BES-ERCAP0027367. Part of the computational work was carried out using supercomputing resources at the Center for Nanoscale Materials (CNM), a DOE Office of Science User Facility located at Argonne National Laboratory that is supported by DOE contract DE-AC02-06CH11357.
Keywords
- core−shell
- gold
- nanocrystals
- plasmonics
- platinum
- thermal stability