Fe_3O_4-C核壳型纳米纤维的正电子研究

Positron study of carbon-Fe_3O_4 coaxial nanofibers

利用正电子手段研究新型多功能材料Fe3O4-C纳米管核壳结构纳米纤维的内部电子结构,通过测量和分析正电子湮没寿命谱和符合双多普勒展宽谱,发现在这种材料中部分正电子在Fe3O4内部的单空位中发生湮灭,部分正电子在Fe3O4的微空洞中发生湮灭,部分正电子在壳层碳纳米管中湮灭.并估算了各个部分的湮灭比例,在一定程度上揭示了Fe3O4-C核壳型纳米纤维内部的微观电子结构.

This paper presents the positron study on carbon-Fe3O4 coaxial nanofibers,which is one kind of new promising functional materials.According to the positron annihilation lifetime spectra and the coincidence Doppler broadening spectra,we find in this material that positrons annihilate partly in monovacancies of Fe_3O4,partly in microcavities of Fe3O4 and partly in shelled carbon nanotubes.We also estimate the annihilation proportion in each part,which reveals the nanofibers microstructure to a certain extent.