Qi Lei,Jiankang He,Bing Zhang,Jinke Chang,Dichen Li
Electrohydrodynamic (EHD) printing is a promising approach to fabricate high-resolution features with low cost and high efficiency. However, the existing EHD printing explorations based on nanoparticle inks commonly require high post-treatment temperature (>150 °C) to achieve desired conductivity, which limits their application in flexible substrates like polymers. Here an EHD printing strategy based on in situ reactive inks is presented to fabricate microscale conductive silver features with tunable resistance on various flexible substrates at mild temperature. The width of the EHD printed features can be flexibly tuned by process parameters, while the resistance can be tuned by the number of printing layers. The printed feature has the smallest size of 27.6 ± 3.4 μm and exhibits an electrical conductivity of 3.3 × 106 S m−1. The capability to electrohydrodynamically print microscale conductive features on various flexible substrates was finally demonstrated.
Bing Zhang,Jiankang He,Jiaxin Li,Lei Wang,Dichen Li
Patterning of zinc oxide (ZnO) nanorods has attracted considerable interests to enhance the performance of ZnO-based functional devices. Most of the existing techniques for patterned ZnO nanorods are based on conventional microfabrication methods that commonly require cleanroom environment, high-cost equipment and complicated processes. In this study, electrohydrodynamic (EHD) printing strategy was accommodated to fabricate microscale ZnO nanorods patterns based on in situ reactive inks. Smaller working voltage and larger nozzle-to-collector distance facilitated the formation of thinner PEO-Zn(NO3)2 filaments, which were decomposed into ZnO nanoparticles to serve as the seeding template for the hydrothermal growth of ZnO nanorods. The resultant ZnO nanorods can be flexibly tuned by the EHD printed patterns. The effect of growth time on the size and morphology of ZnO nanorods was investigated. Compared with the spin-coating method, the photoelectrochemical property of patterned ZnO nanorods was well controlled and showed enhanced photoelectrochemical stability. The presented method provides a flexible and rapid way to customize patterned ZnO nanorods that can be potentially used in the fields of optical detectors, biosensors or solar-driven devices.
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