Consiglio Nazionale delle Ricerche, Istituto per la Conservazione e la Valorizzazione dei Beni Culturali (ICVBC), Via Cozzi 53, 20125, Milano, Italy.
Analyst. 2017 Dec 4;142(24):4801-4811. doi: 10.1039/c7an00873b.
This paper is aimed at demonstrating the potentiality of high resolution Attenuated Total Reflection Fourier Transform Infrared micro-mapping (micro-ATR-FTIR) to reconstruct the images of micrometric multi-layered systems. This method can be an effective analytical alternative when the layer thickness requires high lateral resolution, and fluorescence or thermal effects prevent the deployment of conventional analytical techniques such as micro-Raman spectroscopy. This study demonstrates the high micro-ATR-FTIR setup performances in terms of lateral resolution, spectral quality and chemical image contrast using a new laboratory instrument equipped with a single element detector. The method has been first validated on mock-ups and then successfully applied on cross-sectional samples from real artworks: Leonardo da Vinci's mural painting, characterised by a few micrometers thin sequence of organic and inorganic layers, and an outdoor marble statue, with a complex sequence of decay products on its surface. This study paves the way to a new investigation modality of micrometric systems, combining high lateral resolution with excellent spectral quality, essential in the field of Cultural Heritage as well as in the wider area of materials and forensic sciences.
本文旨在展示高分辨率衰减全反射傅里叶变换红外微测绘（micro-ATR-FTIR）在重建微尺度多层系统图像方面的潜力。当层厚需要高横向分辨率，并且荧光或热效应阻止使用传统分析技术（如微拉曼光谱）时，该方法可以成为一种有效的分析替代方法。本研究使用配备单个元件检测器的新型实验室仪器，展示了高微 ATR-FTIR 装置在横向分辨率、光谱质量和化学图像对比度方面的出色性能。该方法首先在模型上进行了验证，然后成功应用于真实艺术品的横截面样品：列奥纳多·达·芬奇的壁画，其特征是几微米厚的有机和无机层序列，以及户外大理石雕像，其表面有复杂的衰变产物序列。这项研究为微尺度系统的新研究模式铺平了道路，结合了高横向分辨率和优异的光谱质量，在文化遗产领域以及更广泛的材料和法医学领域都是必不可少的。
