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High-pressure structural transformations in semiconductor nanocrystals.

S H Tolbert, A P Alivisatos

    Annual Review of Physical Chemistry
    |December 18, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Structural transformation pressure in semiconductor nanocrystals increases as size decreases. This phenomenon, observed in cadmium selenide (CdSe), cadmium sulfide (CdS), and silicon (Si) nanocrystals, is attributed to surface energy changes during phase transitions.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Solid-State Physics

    Background:

    • Semiconductor nanocrystals exhibit unique properties influenced by size.
    • Understanding pressure-induced structural changes is crucial for materials applications.

    Purpose of the Study:

    • To investigate pressure-induced structural transformations in semiconductor nanocrystals.
    • To determine the effect of crystallite size on transformation pressure.

    Main Methods:

    • High-pressure Raman spectroscopy
    • Extended X-ray absorption fine structure (EXAFS)
    • X-ray diffraction
    • Optical absorption spectroscopy

    Main Results:

    • All techniques revealed an increase in solid-solid structural transformation pressure with decreasing nanocrystal size.
    • This size-dependent effect was observed in cadmium selenide (CdSe), cadmium sulfide (CdS), and silicon (Si) nanocrystals.
    • The phenomenon is explained by increased surface energy in high-pressure phase nanocrystals due to shape changes.

    Conclusions:

    • The elevation in structural transformation pressure in nanocrystals is a kinetic effect, not thermodynamic.
    • Transition path-induced shape changes alter nanocrystal surfaces, increasing surface energy.
    • This provides insight into the behavior of nanomaterials under extreme conditions.