1.1 Overview
7
Fig. 1.3 Cluster size dependence of the Au 4f level positive energy shift with respect to the vacuum
level. Reprinted with permission from [82]
Therefore, comprehension of the catalytic ability due to undercoordination from
the perspective of local bond relaxation and the associated electronic energetics, i.e.,
entrapment or polarization, is of great importance.
Performance of the hetero-coordinated atoms for alloys, dopants, embedded
nanocrystals, impurities, and interfaces is another subject of extensive study. Interfacial bond formation perturbs the local Hamiltonian, binding energy density, and
atomic cohesive energy, associated with local charge entrapment or polarization,
which determines the catalytic, electronic, dielectric, optic, mechanical, and thermal
properties of the interface. Atomic hetero-coordination makes the interface region
completely different from the bulk of the constituent parents [84, 85].
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