Application of confocal Raman spectroscopy to thin polymer layers on highly scattering substrates: a case study of synthetic adhesives on historic textiles
نویسندگان
چکیده
This study considers confocal Raman spectroscopy as a means of identifying a range of synthetic polymeric adhesives used in textile conservation. Many of the synthetic adhesives applied to support fragile textiles in the 1970s are now showing signs of ageing and the textiles are therefore being presented for retreatment. With no record of the adhesive used, conservators are unsure of the appropriate protocol to remove the original adhesive prior to retreatment. We have shown that Raman spectroscopy lends itself to the analysis of these thin polymer layers as it is inherently non-destructive and can be applied in situ. We also found that, for particularly thin polymer layers (∼20 μm), the underlying textile often scatters far more efficiently than the overlying polymer and therefore the polymer cannot always be identified unambiguously in situ. Although thick, transparent polymer samples are known to produce maximum Raman peak intensity when the laser is focused a few microns below the sample surface, focusing on or just above (0–5 μm) the polymer layer is shown to maximize the ratio of polymer peak intensity to textile substrate peak intensity, thus facilitating identification of the polymer. Defocusing further to a point 20 μm above the upper surface is shown to reintroduce interference from the substrate spectrum to a level comparable to that acquired when focused within the thin polymer layer, closer to the textile substrate. Copyright 2004 John Wiley & Sons, Ltd.
منابع مشابه
Laser Micro-Raman Spectroscopy of CVD Nanocrystalline Diamond Thin Film
Laser micro-Raman spectroscopy is an ideal tool for assessment and characterization of various types of carbon-based materials. Due to its special optical properties (CrN) coated stainless steel substrates. NCD films have been investigated by laser micro-Raman spectroscopy. The fingerprint of diamond based materials is in the spectral region of 1000-1600 cm-1 in the first order of Raman scatter...
متن کاملAn innovative surface-enhanced Raman spectroscopy (SERS) method for the identification of six historical red lakes and dyestuffs
Surface-enhanced Raman spectroscopy (SERS) was used in this work to obtain highly detailed spectra of artists’ red lake pigments and colorants. In the past, Raman spectroscopy has been successfully employed to identify many pigments and modern synthetic dyes. Unfortunately, red lake pigments and dyes commonly employed in artistic production from antiquity to the mid-nineteenth century are often...
متن کاملAnalytical Capability of Defocused µ-SORS in the Chemical Interrogation of Thin Turbid Painted Layers
A recently developed micrometer-scale spatially offset Raman spectroscopy (μ-SORS) method provides a new analytical capability for investigating non-destructively the chemical composition of sub-surface, micrometer-scale thickness, diffusely scattering layers at depths beyond the reach of conventional confocal Raman microscopy. Here, we demonstrate experimentally, for the first time, the capabi...
متن کاملSol – Gel Spin Coated Cadmium Sulphide Thin Films on Silicon (1 0 0) Substrates for Optoelectronic Applications
Cadmium chalcogenides with appropriate band gap energy have been attracting a great deal of attention because of their potential applications in optoelectronic devices. In this work CdS thin films were deposited on p – type silicon substrates by sol – gel spin coating method at different substrate temperatures. The CdS deposited wafers were characterized by X‐ray diffracti...
متن کاملSurface Enhanced Raman Scattering of Crystal Violet with Low Concentrations Using Self-Assembled Silver and Gold-Silver Core-Shell Nanoparticles
The active substrates in surface enhanced Raman scattering (SERS) spectroscopy were prepared through self-assembly of nanoparticles on functionalized glasses. Colloidal silver nanoparticles (Ag NPs) were prepared chemically in two different sizes by reduction of AgNO3 using trisodium citrate and sodium borohydride. Gold–silver core–shell nanoparticles were also prepared to compare between the o...
متن کامل