A method for the extraction and accumulation of Ag nanoparticles utilizing capillary action through a piece of triangular-shaped cotton paper is reported. This method allowed the integration of SERS and the BPG spot test, which are typically employed for examining pigments on paper or in books. Malachite green oxalate was used as the model material for investigating the extent of enhancement when SERS was applied. The dynamic behavior of the Ag nanoparticles was also studied. When the cotton paper was pre-treated with malachite green oxalate, Ag nanoparticles could be extracted and accumulated on the triangular top, resulting in a dramatic SERS improvement. When malachite green oxalate (at a concentration of 10⁻⁶ M) was applied using this method, a dramatic analytical enhancement factor of approximately 3000% was obtained. Finally, the method developed in this study was successfully applied to the analysis of pigments in paintings from a university collection. The findings revealed that phthalocyanine blue was a popular pigment used in numerous paintings during the 1950s.

中文翻译：

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基于 BPG 斑点测试的毛细管作用驱动表面增强拉曼光谱 (SERS) 鉴定现代绘画中的酞菁蓝

报道了一种通过三角形棉纸利用毛细管作用提取和积累银纳米粒子的方法。这种方法可以将 SERS 和 BPG 斑点测试结合起来，这通常用于检查纸张或书籍上的颜料。使用孔雀石绿草酸盐作为模型材料来研究应用 SERS 时的增强程度。还研究了银纳米粒子的动态行为。当用孔雀石绿草酸盐对棉纸进行预处理时，Ag纳米颗粒可以被提取并积累在三角形顶部，从而导致SERS显着改善。当使用该方法应用孔雀石绿草酸盐（浓度为10 ^{-6 M）时，获得了大约3000%的显着分析增强因子。}最后，本研究开发的方法成功应用于大学收藏画作中颜料的分析。研究结果表明，酞菁蓝是 20 世纪 50 年代众多绘画中常用的颜料。