Colloidal Synthesis of Hollow Cobalt Sulfide Nanocrystals

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Formation of cobalt sulfide hollow nanocrystals through amechanism similar to the Kirkendall Effect has been investigated indetail. It was found that performing the reaction at>120oC leads tofast formation of a single void ins ide each shell, whereas at roomtemperature multiple voids are formed within each shell, which can beattributed to strongly temperature-dependent diffusivities for vacancies.The void formation process is dominated by outward diffusion of cobaltcations; still, significant inward transport of sulfur anions can beinferred to occur as the final voids are smaller in diameter than theoriginal cobalt nanocrystals. Comparison of volume distributions forinitial and final nanostructures indicates excess apparent volume ... continued below

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Yin, Yadong; Erdonmez, Can K.; Cabot, Andreu; Hughes, Steven & Alivisatos, A. Paul March 16, 2006.

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Formation of cobalt sulfide hollow nanocrystals through amechanism similar to the Kirkendall Effect has been investigated indetail. It was found that performing the reaction at>120oC leads tofast formation of a single void ins ide each shell, whereas at roomtemperature multiple voids are formed within each shell, which can beattributed to strongly temperature-dependent diffusivities for vacancies.The void formation process is dominated by outward diffusion of cobaltcations; still, significant inward transport of sulfur anions can beinferred to occur as the final voids are smaller in diameter than theoriginal cobalt nanocrystals. Comparison of volume distributions forinitial and final nanostructures indicates excess apparent volume inshells implying significant porosity and/or a defective structure.Indirect evidence for shells to fracture during growth at lowertemperatures was observed in shell size statisticsand TEM of as-grownshells. An idealized model of the diffusional process imposes two minimalrequirements on material parameters for shell growth to be obtainablewithin a specific synthetic system.

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  • Journal Name: Advanced Functional Materials; Journal Volume: 16; Related Information: Journal Publication Date: 2006

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  • Report No.: LBNL--59874
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1002/adfm.200600256 | External Link
  • Office of Scientific & Technical Information Report Number: 901223
  • Archival Resource Key: ark:/67531/metadc888958

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 16, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 16, 2016, 1:14 p.m.

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Yin, Yadong; Erdonmez, Can K.; Cabot, Andreu; Hughes, Steven & Alivisatos, A. Paul. Colloidal Synthesis of Hollow Cobalt Sulfide Nanocrystals, article, March 16, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc888958/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.