光致发光
无定形固体
材料科学
透射率
衍射
傅里叶变换红外光谱
分析化学(期刊)
表征(材料科学)
光谱学
红外线的
相(物质)
光学
光电子学
化学
纳米技术
物理
有机化学
量子力学
作者
Cesário Antônio Duarte,Allan Ricardo Gepiak
标识
DOI:10.1177/00037028221081170
摘要
Bitumen (BIT) is an oil sub-product with many applications. A variety of literature reports the analysis of its optical properties, as the fluorescence and the Fourier transform infrared (FT-IR) optical transmittance (OT). We have performed photoluminescence (PL) on the visible region of the spectrum and OT on the visible-NIR in solutions of BIT in toluene at different concentrations. The results revealed a nonlinear, concentration-dependent effect attributed to intermolecular solvent-solute interactions. PL analysis of pure BIT as a function of the temperature and the laser pumping power pointed to the existence of nanosized crystalline inclusions on the amorphous BIT matrix with noticeable optical properties. The inference was confronted with the results of X-ray diffraction studies and literature reports. The possibility of the occurrence of a quantum size effect governing the luminescence is considered.
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