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Positron annihilation studies of defects and interfaces in ZnS nanostructures of different crystalline and morphological features
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10.1063/1.2354479
/content/aip/journal/jcp/125/16/10.1063/1.2354479
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/16/10.1063/1.2354479

Figures

Image of FIG. 1.
FIG. 1.

X-ray diffraction pattern of (a) the hexagonal nanoparticles, (b) cubic nanoparticles, and (c) nanorods.

Image of FIG. 2.
FIG. 2.

High resolution transmission electron micrograph of the ZnS nanocrystals with average grain size of : (a) hexagonal particle and (b) cubic particle.

Image of FIG. 3.
FIG. 3.

The optical absorption spectra of the ZnS samples: (a) hexagonal and (b) cubic.

Image of FIG. 4.
FIG. 4.

(a) TEM micrograph of the ZnS nanorods and (b) high resolution transmission electron micrograph of one ZnS nanorod.

Image of FIG. 5.
FIG. 5.

(a) The measured (closed squares) and the calculated values of the shorter lifetime vs grain size of the ZnS hexagonal samples: the closed triangles indicate values from the two-state trapping model [Eq. (2)]. The closed circles give values from the three-state trapping model with a well-resolved and the open circles give the values on modifying the same by including the positronium component within the trapped positron lifetime term. The lines are to guide the eyes only. (b) The measured (closed squares) and the calculated values of the shorter lifetime vs grain size of the ZnS cubic samples: the closed triangles indicate values from the two-state trapping model [Eq. (2)]. The closed circles give values from the three-state trapping model with a well-resolved and the open circles give the values on modifying the same by including the positronium component within the trapped positron lifetime term. The lines are to guide the eyes only.

Image of FIG. 6.
FIG. 6.

(a) The orthopositronium lifetime and intensity vs grain sizes of the ZnS hexagonal samples. (b) The orthopositronium lifetime and intensity vs grain sizes of the ZnS cubic samples.

Image of FIG. 7.
FIG. 7.

The variation of the longer positron lifetime component with grain sizes of (a) hexagonal and (b) cubic nanocrystalline samples of ZnS.

Image of FIG. 8.
FIG. 8.

(a) The positron trapping rates (closed circles) in nanocrystalline grain interfaces and (open circles) in crystal vacancies of the hexagonal samples of different grain sizes. (b) The positron trapping rates (closed circles) in nanocrystalline grain interfaces and (open circles) in crystal vacancies of the cubic samples of different grain sizes.

Image of FIG. 9.
FIG. 9.

The parameter vs grain size of the ZnS nanocrystalline samples: hexagonal (closed circles) and cubic (open circles).

Image of FIG. 10.
FIG. 10.

The parameter vs grain size of the ZnS nanocrystalline samples: hexagonal (closed circles) and cubic (open circles).

Image of FIG. 11.
FIG. 11.

The vs plot of the ZnS nanocrystalline samples: hexagonal (closed circles) and cubic (open circles).

Image of FIG. 12.
FIG. 12.

The mean positron lifetime vs grain size of the ZnS nanocrystalline samples: (a) hexagonal and (b) cubic.

Tables

Generic image for table
Table I.

Positron lifetimes, their intensities, and parameter of the three nanorod samples. Typical errors are as applicable for the figures of nanoparticle samples.

Generic image for table
Table II.

Lattice parameters obtained for the different samples from the respective x-ray diffraction patterns.

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/content/aip/journal/jcp/125/16/10.1063/1.2354479
2006-10-31
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Positron annihilation studies of defects and interfaces in ZnS nanostructures of different crystalline and morphological features
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/16/10.1063/1.2354479
10.1063/1.2354479
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