Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 3, Issue 2, Pages 345-351Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc01873g
Keywords
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Funding
- National Science Foundation of China (NSFC) [51073113, 51373110]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [10KJA540046]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Qing Lan Project for Excellent Scientific and Technological Innovation Team of Jiangsu Province
- Project for Jiangsu Scientific and Technological Innovation Team
- Deanship of Scientific Research at King Saud University [RGP-089]
- Postdoctoral Science Foundation of Jiangsu province [1201030B]
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Novel, freestanding membranes composed of SiO2@Bi2O3 hierarchical core/shell fibers were prepared by a combination of two fabrication methods: electrospinning and hydrothermal reaction. The SiO2@Bi2O3 composite membranes were primarily supported by flexible SiO2 fibers after the calcination treatment of electrospun PVA/SiO2 hybrid fibrous membranes. SiO2@Bi2O3 composite fibers were fabricated via a process that entails hydrothermal growth of a bismuth precursor nanocoating (Bi-PN) on the surface of SiO2 fibers followed by the thermal treatment of the harvested SiO2@Bi-PN fibers. It was observed that Bi2O3 nanoparticles were well anchored on the surface of SiO2 fibers and the phase transition of Bi2O3 nanoparticles occurred during the thermal treatment of SiO2@Bi-PN composite fibers at different temperatures. The infrared emission rates of the resultant SiO2@Bi2O3 composite membranes were evaluated in comparison with pure SiO2 fibers in 2-22 mu m wavebands. It is theorized that the coating of Bi2O3 nanoparticles contributes to the decrease of infrared emissivity, and the infrared emission properties of SiO2@Bi2O3 composite fibers are related to the alpha-Bi2O3 phase. The results favourably indicated prospects of SiO2@Bi2O3 composite fibrous membranes for applications in infrared stealth camouflage.
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