Identification of the reconstruction and bonding structure of SiC nanocrystal surface by infrared spectroscopy

Identification of the reconstruction and bonding structure of SiC nanocrystal surface by infrared spectroscopy
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红外光谱识别SiC纳米晶表面重构及键合结构

DOI:
10.1016/j.apsusc.2011.06.116
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发表时间:
2011-10
影响因子:
6.7
通讯作者:
Lu, R. F.
Lu, R. F.
中科院分区:
材料科学1区
文献类型:
--
作者:
Fan, J. Y.;Li, H. X.;Zhang, N.;Lu, R. F.

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我们利用红外光谱研究了立方碳化硅纳米晶体的表面结构。研究发现,这些纳米晶体中明显发生了 Si-Si 表面重构。此外,氧桥键在其表面结构中占主导地位,这确保了超稳定量子限制光致发光的发生。较大的微晶表现出更弱的红外信号,但表现出小颗粒中不存在的纵向声子模式。分散在较低极性溶剂中的纳米晶体表现出与水溶剂中不同的额外表面键合结构。
We studied the surface structures of the cubic SiC nanocrystals by use of infrared spectroscopy. It was found that the Si–Si surface reconstruction occurs significantly in these nanocrystals. Besides, the oxygen bridge bond dominates their surface structure, which ensures the occurrence of ultra stable quantum-confinement photoluminescence. The larger crystallites exhibit much weaker infrared signals, but show longitudinal phonon mode that is absent in the small particles. The nanocrystals dispersed in lower-polarity solvent exhibit additional surface bonding structure other than that in water solvent.
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