Area-selective growth of amorphous carbon nanofibers via catalytic decomposition of polyimide thin film

Kim, Chang Kyung; Yoon, Chong Seung

doi:10.1039/b709420e

Cited by 2 publications

(2 citation statements)

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“…The area integral intensity ratio of the D and G peaks (I D /I G ) in the Raman spectra was calculated to be 3.327, indicating the presence of amorphous carbon in the form of nanofibers. 43 The length of the FeSe filling inside the nanocables could be increased by varying the reaction conditions, including an increase in the concentration of the reactants (Se and Fe(acac) 3 ), whereby, we could successfully extend FeSe filling further away from the tip (Supporting Information, Figure S3). The diameter of the FeSe filling could be somewhat controlled by the diameter of the AuÀPd catalyst particle, where the optimal catalyst thickness was observed to be 50À100 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Raman analysis demonstrated both a D band and a G band at 1319.30 and 1585.85 cm –1 , respectively (Supporting Information, Figure S2b). The area integral intensity ratio of the D and G peaks (I D /I G ) in the Raman spectra was calculated to be 3.327, indicating the presence of amorphous carbon in the form of nanofibers . The length of the FeSe filling inside the nanocables could be increased by varying the reaction conditions, including an increase in the concentration of the reactants (Se and Fe(acac) 3 ), whereby, we could successfully extend FeSe filling further away from the tip (Supporting Information, Figure S3).…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Superconducting Nanocables of FeSe Encapsulated in Carbonaceous Shell

et al. 2013

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The recent discovery of superconductivity in iron selenide has attracted considerable attention due to the simplicity of composition, unconventional nature of superconductivity, and ease of synthesis. We have synthesized superconducting FeSe nanowires with a simple catalyst-aided vapor transport reaction at 800 °C in an inert atmosphere. The precursors were chosen to be elemental Se and iron acetylacetonate [Fe(III)(C₅H₈O₂)₃]. These vaporized very easily, thereby facilitating transport, and also contributed to the formation of a carbonaceous shell encapsulating the FeSe nanowires. The superconductivity of these nanocables was confirmed through magnetic measurements and a T(c) of ≈8 K was obtained for an ensemble of nanocables. The length of FeSe filling inside the carbon nanofibers could be varied by controlling the reaction conditions while the diameter of nanowires was dependent on the thickness of Au-Pd coating used as a catalyst. Extensive analysis through high-resolution microscopy revealed that there was considerable lattice contraction of FeSe in the nanocable up to about 3.6% along the c-direction leading to a reduced spacing between the (001) lattice planes. Interestingly, this compression was more pronounced near the catalyst-FeSe interface and was reduced further along the length of the nanocable. The presence of carbon nanofibers as a shell around the FeSe protected the FeSe nanowires from both atmospheric O₂ and moisture attack, as was evident from the very long ambient condition shelf life of these nanocables, and also makes them more stable under e-beam irradiation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%