Fig. 1: Ag2Se nanoparticles synthesis and ink printing characteristics.
From: Fully inkjet-printed Ag2Se flexible thermoelectric devices for sustainable power generation
a Scanning electron microscopy image of Ag2Se nanoparticles. The inset shows the particle size statistics. b Digital photographs of Ag2Se ink in the normal and inverted states before and after 24 h of resting. c Schematic diagram of the working principle of an inkjet printing equipment. An electronically-driven piezoelectric actuator generates a pressure pulse that ejects the droplets from the nozzle. d Parameter plot of the Reynolds and Weber numbers for our Ag2Se ink. Several inks reported previously for inkjet printing are included for comparison35,36. e Jetting cycle of a 10 pL Ag2Se ink droplet during a time interval of 20 µs. f Splat diameter histogram for Ag2Se ink and the droplets on a photographic paper (inset). g Dependence of the uniformity and porosity of printed Ag2Se films on the droplet spacing (DS). h Inkjet printing multiple parallel lines on a micron scale using Ag2Se ink, demonstrating high printing accuracy. i Variation of Ag2Se film thickness with the number of printing layers after annealing. The inset shows a photograph of an Ag2Se film with 40 printing layers.
