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A by-product processing of Si3N4 saw-tooth nanoribbons during carbon foam processing using pyrolysis-nitridation reactions

Abstract

Si3N4 saw-tooth nanoribbons (SNSNs) have been synthesized via a novel approach involving a by-product pyrolysis-nitridation process during carbon foam manufacturing at 1450ºC. The SNSNs formed are ribbon shaped with 80–750 nm wide, 70-80 nm thick and several micrometres in length. The process simply involved thermal pyrolysis of the powdered mixture containing carbon foam precursors and silicon powder under flowing high-purity nitrogen. Pyrolysis gases rich in silicon, silicon oxide and active nitrogen vapours promoted the subsequent synthesis of the SNSNs over the outer surface of carbon foam via a vapour–solid mechanism. The crystal structure, morphology, chemical composition, growth mechanism and photoluminescence (PL) properties have been studied. The infrared adsorption of SNSNs exhibited two absorption bands with all the peaks related to Si–N bond of α-Si3N4 crystalline structure. X-ray photoelectron spectroscopy measurements further confirmed the chemical composition with a minor impurity of oxygen and carbon. A single nanoribbon has the same width-to-thickness ratio, suggesting a stable morphology resulting from reduction of overall surface energy. Intense PL was observed centred at 2.03, 2.48, 2.62, and 3.01 eV, which was resulted from the recombination between the intrinsic conduction band edges and silicon dangling bonds with a deep-level or trap-level states.

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Publication details

The article was received on 15 Jun 2017, accepted on 04 Aug 2017 and first published on 04 Aug 2017


Article type: Paper
DOI: 10.1039/C7CE01121K
Citation: CrystEngComm, 2017, Accepted Manuscript
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    A by-product processing of Si3N4 saw-tooth nanoribbons during carbon foam processing using pyrolysis-nitridation reactions

    S. Farhan, R. Wang, D. Zhang and K. Li, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01121K

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