Figure 4

Schematics of printed thermoelectric layer on top of bare glass fiber fabric (a) and on Chitosan layer (b) used as a preliminary layer to smoothen the rough bare fabric. Optical surface profiles of bare glass fiber fabric (c) and printed Chitosan layer on top of glass fiber fabric (d) with their measured 3-dimensional surface images using a Keyence optical microscope (insets). SEM cross-sectional images of printed and hot-pressed samples on fabrics with thickness of 11 µm (e), 111 µm (f) and 395 µm (g). Plots of electrical conductivity as a function of thickness of the printed BST layers without (h) and with chitosan (i).