Introduction
Handcrafted paper is valued for its unique texture, strength, and aesthetic qualities, which arise from the natural arrangement of fibres formed during manual production processes. Unlike industrial paper, handcrafted paper often exhibits irregular fibre distribution, variable porosity, and distinctive surface features that directly influence its mechanical properties and visual appearance.
Scanning Electron Microscopy (SEM) is an essential tool for investigating the microscopic morphology of handcrafted paper, enabling detailed visualization of fibre networks, bonding points, and surface characteristics that are not resolvable with optical techniques. In this study, handcrafted paper is examined using the NANOS tabletop SEM under both low- and high-vacuum conditions. In addition, Energy-Dispersive X-ray Spectroscopy (EDS) is employed to analyze the elemental composition of the paper.
Low-Vacuum SEM Imaging of Uncoated Handcrafted Paper
Figure 1 shows handcrafted paper imaged in low-vacuum mode without conductive coating, using the backscattered electron detector (BSD). The uncoated sample reveals extensive fibre detail and intricate surface textures, highlighting the natural fibre arrangement and porosity inherent to handcrafted paper.
Low-vacuum operation proves highly effective for imaging non-conductive paper samples in their native state. Fibre junctions, overlapping fibres, and structural irregularities are clearly visible, providing insight into the manual fabrication process and the material’s characteristic heterogeneity.
Figure 1 – BSD image of handcrafted paper in low vacuum mode without coating, highlighting detailed fiber arrangement and natural surface texture.
High-Vacuum SEM Imaging with Gold Coating
To enhance surface-sensitive imaging, the handcrafted paper was coated with a 5 nm layer of gold and examined in high-vacuum mode. This conductive coating enables imaging using the secondary electron detector (SED), which provides increased surface detail compared to BSD imaging.
As shown in Figure 2, SED imaging highlights finer fibre structures and subtle surface irregularities that are less pronounced in BSD mode. These details include fibre surface roughness, micro-fibrillation, and small-scale texture variations that contribute to the tactile and visual qualities of handcrafted paper.
Figure 3 presents a BSD image of the same gold-coated sample, allowing direct comparison between SED and BSD contrast mechanisms. While BSD emphasizes compositional and density-related contrast, SED excels in revealing topographic surface features.
Applications and Relevance
Understanding the fibre structure and surface morphology of handcrafted paper is important for several applications, including:
- Cultural heritage and conservation, where fibre integrity and composition inform preservation strategies
- Material quality assessment, enabling comparison between handcrafted and industrial papers
- Paper manufacturing research, supporting optimization of fibre selection and processing methods
The combination of low-vacuum imaging, high-vacuum surface analysis, and EDS provides a comprehensive approach to characterizing handcrafted paper at the microscale.
