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Vacancy clusters on the surface of gold nanoparticles embedded in MgO

1 Vacancy clusters on the surface of gold nanoparticles embedded in MgO [Pg.330]

The positron lifetimes for different defects in MgO are calculated using the insulator model of Puska and co-workers. In this model, the annihilation rates are determined by the positron density overlapping with the enhanced electron density that is proportional to the atomic polarizability of MgO [8, 9]. Based on comparison between experimental and calculated values [5, 6], the positron lifetime of the embedded Au nanoparticle layer, 0.41 ns, suggests that positrons are predominantly trapped in clusters consisting of [Pg.331]




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Cluster on surfaces

Cluster surface

Clusters embedding

Clusters gold nanoparticles

Clusters nanoparticles

Clusters of gold

Embedded clusters

Embedded nanoparticles

Gold clusters

Gold nanoparticle

Gold nanoparticles

Gold surfaces

MgO

MgO nanoparticle

MgO surface

Surface of MgO

Vacancy clusters

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