Journal
NANOSCALE
Volume 12, Issue 26, Pages 14245-14258Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr02941f
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Funding
- Sherman Fairchild Foundation, Inc.
- Air Force Office of Scientific Research [FA9550-16-1-0150]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
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Thermal treatment of metal nanoparticles at temperatures above 1000 degrees C leads to the formation of nanopores in amorphous SiO(2)planar supports. In this work, we employ Pd/SiO(2)as a model system to investigate how the initial size and distribution of nanoparticles on the SiO(2)surface affects the behavior of the nanoparticles at high temperatures with respect to the formation of nanopores and related structures. We also examine the role of physical processing parameters such as heating temperature, ramp rate, and heating time in altering the type, size, and number density of features formed. These studies reveal that nanopore formation competes with other surface phenomena, including nanoparticle agglomeration and encapsulation, which also occur at high temperatures. We establish that the dominant behavior, among the many competing phenomena occurring at the metal-oxide interface, depends on the initial surface distribution of the nanoparticles. Using this knowledge, we show that the final nanopore diameter and surface density are highly tunable.
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