Assembly of CdSe/ZnS nanocrystals on microwires and nanowires for temperature sensing

Löw, Peter; Pioufle, Bruno Le; Kim, Beomjoon; Bergaud, Christian

doi:10.1016/j.snb.2007.07.123

Cited by 3 publications

(1 citation statement)

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“…[1][2][3] In general, ZnS nanostructures can be synthesized in a variety of morphologies including zero-dimensional nanoparticles, onedimensional nanowires, nanorods, nanoribbons and nanobelts, as well as 2-D nanosheets 4 and more complicated tetrapods and nanoflowers, depending on the growth precursors, temperature and the presence of catalysts. 1,4 In particular, ZnS nanoparticles are the focus of many promising applications including field effect transistors for sensitive detection of biological species, 5 ultraviolet-light sensors with high spectral sensitivity and high photosensitivity, 6 temperature sensors, 7 hydrogen sensors, 8 field emitters, 9 and heterojunction solar cells with high photovoltaic efficiency. 10 Nanoparticles of ZnS are often doped with impurities such as manganese or copper to improve their luminescent properties, and are often used to 'cap' or form a shell around a core nanoparticle consisting of a similar II-VI semiconductor, such as CdS or CdSe.…”

Section: Introductionmentioning

confidence: 99%

Morphological and phase stability of zinc blende, amorphous and mixed core–shell ZnS nanoparticles

2010

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Zinc sulfide (ZnS) nanoparticles are of interest for their luminescent and catalytic properties which are being considered for the next generation of optical, electronic and photovoltaic devices. However, ZnS nanoparticles undergo reversible and irreversible phase transformations under ambient conditions, so a detailed understanding of the nanomorphology is critical in ensuring these desirable properties can be controlled and maintained. Anticipating the structure and transformations in ZnS nanoparticles experimentally is difficult, since selectivity among competing phases, shapes and sizes is intrinsically linked. Presented here are the results of first principle computer simulations and advanced theoretical modelling used to investigate the relationship between size and shape in determining the crystallinity of ZnS nanoparticles. We find that the equilibrium morphology is characterised by {220} facets, irrespective of the size of the particle, but that the presence of different high energy facets introduced kinetically may significantly influence the zinc blende to amorphous ZnS transformation size, as well as the agglomeration behaviour. In addition to this, we model the relationship between transformation size, morphology and the ratio of crystalline core to amorphous shell and show that at small sizes, a core-shell crystalline/amorphous structure is thermodynamically favourable.

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