2009
DOI: 10.1021/ja809854q
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Selective Facet Reactivity during Cation Exchange in Cadmium Sulfide Nanorods

Abstract: The partial transformation of ionic nanocrystals through cation exchange has been used to synthesize nanocrystal heterostructures. We demonstrate that the selectivity for cation exchange to take place at different facets of the nanocrystal plays an important role in determining the resulting morphology of the binary heterostructure. In the case of copper I (Cu + ) cation exchange in cadmium 2 sulfide (CdS) nanorods, the reaction starts preferentially at the ends of the nanorods such that copper sulfide (Cu 2 S… Show more

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Cited by 393 publications
(530 citation statements)
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“…Examining and understanding these observations suggest a possible growth mechanism for the "barbell" heterostructure: it has been widely accepted that the tips of nanowires usually possess the highest reactivity where the reaction/growth tends to happen first. 25,26 If anhydrous hydrazine is used, the strong reduction environment as well as the high transient concentration of bismuth atoms (reduced from Bi-(NO 3 ) 3 ·5H 2 O by hydrazine) will override the preferred growth on Te nanowire tips so that a nonselective absorption and alloying between Bi and Te nanowire will lead to the uniform conversion into Bi 2 Te 3 nanowires, which has been identified in the previous research. 20,21 Reducing the concentration of hydrazine to 80% and using smaller and smaller amounts slows down the generation of Bi atoms, thus promoting the selective growth of Bi 2 Te 3 plates on the Te nanowire tips.…”
mentioning
confidence: 87%
“…Examining and understanding these observations suggest a possible growth mechanism for the "barbell" heterostructure: it has been widely accepted that the tips of nanowires usually possess the highest reactivity where the reaction/growth tends to happen first. 25,26 If anhydrous hydrazine is used, the strong reduction environment as well as the high transient concentration of bismuth atoms (reduced from Bi-(NO 3 ) 3 ·5H 2 O by hydrazine) will override the preferred growth on Te nanowire tips so that a nonselective absorption and alloying between Bi and Te nanowire will lead to the uniform conversion into Bi 2 Te 3 nanowires, which has been identified in the previous research. 20,21 Reducing the concentration of hydrazine to 80% and using smaller and smaller amounts slows down the generation of Bi atoms, thus promoting the selective growth of Bi 2 Te 3 plates on the Te nanowire tips.…”
mentioning
confidence: 87%
“…[1][2][3][4][5][6][7] It is generally assumed that during such an exchange, the anionic framework of the crystal is conserved, while the cations, due to their relatively smaller size and higher mobility, undergo replacement. This has not, however, been experimentally proven or utilized, as only single-phase nanocrystals have so far been transformed using cation exchange.…”
mentioning
confidence: 99%
“…Nanoscale heterojunctions 12 and 'barcodes' 13 could further be fabricated by varying the ion concentration.…”
mentioning
confidence: 99%