TY - JOUR
T1 - Mapping the thermal entrenchment behavior of Pd nanoparticles on planar SiO2supports
AU - Gosavi, Abha
AU - Mirkin, Chad
AU - Notestein, Justin
N1 - Funding Information:
This material is based upon work supported by the Sherman Fairchild Foundation, Inc. and the Air Force Office of Scientific Research under Award number FA9550-16-1-0150. This work made use of the EPIC and SPID facilities of Northwestern University’s NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1121262) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN.
Publisher Copyright:
© 2020 The Royal Society of Chemistry.
PY - 2020/7/14
Y1 - 2020/7/14
N2 - Thermal treatment of metal nanoparticles at temperatures above 1000 °C leads to the formation of nanopores in amorphous SiO2 planar supports. In this work, we employ Pd/SiO2 as a model system to investigate how the initial size and distribution of nanoparticles on the SiO2 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.
AB - Thermal treatment of metal nanoparticles at temperatures above 1000 °C leads to the formation of nanopores in amorphous SiO2 planar supports. In this work, we employ Pd/SiO2 as a model system to investigate how the initial size and distribution of nanoparticles on the SiO2 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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U2 - 10.1039/d0nr02941f
DO - 10.1039/d0nr02941f
M3 - Article
C2 - 32608426
AN - SCOPUS:85088487413
VL - 12
SP - 14245
EP - 14258
JO - Nanoscale
JF - Nanoscale
SN - 2040-3364
IS - 26
ER -