The Effect of the Concentration of Phosphotungstic Acid on Its Radiation-Induced Reduction in Nanocomposites with Poly(Vinyl Alcohol)

IF 0.8 4区 化学 Q4 SPECTROSCOPY Journal of Applied Spectroscopy Pub Date : 2024-07-05 DOI:10.1007/s10812-024-01757-1
A. A. Gorbachev, O. N. Tretinnikov
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Abstract

A detailed analysis of the previously discovered effect of the concentration of phosphotungstic acid (PTA) on its reduction within nanocomposite films with poly(vinyl alcohol) (PVA) induced by gamma radiation indicated that the molar absorption coefficient of the maximum of the PTA band due to intervalence charge transfer in reduced PTA heteropolyanions at low PTA concentrations is eight times higher than at high concentrations. Only 20% of this increase is attributed to the predominance of two- and one-electron-reduced heteropolyanions at low and high concentrations, respectively. We concluded that the main reason for the concentration effect is associated with a decrease in the size the PTA nanoparticles with decreasing PTA concentration in the films.

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磷钨酸浓度对其在聚乙烯醇纳米复合材料中辐射诱导还原的影响
对之前发现的磷钨酸(PTA)浓度对伽马射线诱导的聚乙烯醇(PVA)纳米复合薄膜内磷钨酸还原的影响进行了详细分析,结果表明,在低浓度 PTA 下,还原的 PTA 杂多离子中因间隔电荷转移而产生的 PTA 波段最大值的摩尔吸收系数比高浓度时高八倍。这种增加只有 20% 是由于在低浓度和高浓度下分别以双电子和单电子还原杂多离子为主。我们得出结论,浓度效应的主要原因与薄膜中 PTA 浓度降低时 PTA 纳米粒子的尺寸减小有关。
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来源期刊
CiteScore
1.30
自引率
14.30%
发文量
145
审稿时长
2.5 months
期刊介绍: Journal of Applied Spectroscopy reports on many key applications of spectroscopy in chemistry, physics, metallurgy, and biology. An increasing number of papers focus on the theory of lasers, as well as the tremendous potential for the practical applications of lasers in numerous fields and industries.
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