Effect of graphene oxide on in-situ surface growth of pure α-Si3N4 microbelts and their blue luminescent performance

In-situ surface grown pure α-Si3N4 microbelts have been successfully obtained by graphene oxide-assisted pyrolysis of polyvinylsilazane at 1550 °C under H2/N2 atmosphere. The α-Si3N4 microbelts are 10–500 μm length, ∼500 nm thickness and ∼5 μm width with smooth surface. The surface growth mechanism...

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Bibliographic Details
Published in:Carbon (New York) 2019-12, Vol.154, p.74-80
Main Authors: Cao, Lisheng, Guo, Jingdong, Wang, Song, Gao, Chunlan, Zhang, Wenshu, Yang, De'an
Format: Article
Language:English
Subjects:
Carbon
Chemical elements
Chemical reactions
Emission spectra
Graphene
Photoluminescence
Pyrolysis
Room temperature
Silicon
Silicon nitride
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Summary:In-situ surface grown pure α-Si3N4 microbelts have been successfully obtained by graphene oxide-assisted pyrolysis of polyvinylsilazane at 1550 °C under H2/N2 atmosphere. The α-Si3N4 microbelts are 10–500 μm length, ∼500 nm thickness and ∼5 μm width with smooth surface. The surface growth mechanism of α-Si3N4 microbelts is supposed to be vapor-solid growth. GO addition promotes not only the formation of Si-O bond and free carbon at 1000 °C but also the reaction to SiC and N2 at 1550 °C. GO as an additive increases the yield of α-Si3N4 microbelts. The photoluminescence (PL) spectra of α-Si3N4 microbelts contain two emission peaks at 421 nm and 441 nm at room temperature. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2019.07.063