In this research, we introduce direct selective nanowire array growth by inkjet printing of Zn acetate precursor ink patterning and subsequent

hydrothermal ZnO local growth without using ZnO nanoparticle seed to remove frequent nozzle clogging problem and without using conventional multistep processes. The proposed process can directly grow ZnO nanowire in any arbitrary patterned shape and it is basically very fast, low cost, environmentally benign, and low temperature. Therefore, zinc acetate precursor inkjet printing-based direct nanowire local growth is expected to give extremely high flexibility in nanomaterial patterning for high-performance electronics fabrication especially at the development stage. As a proof of concept of the proposed method, ZnO nanowire network-based field effect transistors and ultraviolet (UV) photodetectors were demonstrated by direct selleckchem patterned grown ZnO nanowires as active layer. Methods ZnO nanowire arrays were selectively grown from the inkjet-printed Thiazovivin Zn acetate on glass or Si wafer through the hydrothermal decomposition of a zinc complex. The process is mainly composed of two simple steps as shown in Figure 1; (1) Zn acetate inkjet printing and thermal decomposition on

a substrate, and (2) subsequent selective ZnO nanowire hydrothermal growth on the inkjet-printed Zn acetate patterns. Figure 1 Process schematics of the direct patterned ZnO nanowire growth from the inkjet-printed Zn acetate patterns. After Zn acetate inkjet printing, ZnO nanowires were grown ARRY-438162 in vitro hydrothermally at 90°C heating for 2.5 h. Zn acetate ink for seed layer generation For general ZnO nanowire growth, spin coating [10, 11] or inkjet printing [9] of ZnO nanoparticle solution has been usually used as seed layer preparation. Instead of using nanoparticle seeds, in this research, Zn acetate precursor ink was inkjet printed for the local growth of ZnO nanowire arrays. While ZnO nanoparticle solution causes inkjet nozzle clogging problem, Zn acetate precursor ink can remove that problem completely. The Zn acetate ink was prepared from

5 mM zinc acetate (C4H6O4Zn, Sigma Aldrich, St. Louis, MO, USA) in ethanol. The Zn acetate ink was inkjet printed on the heated target substrate. The dried Zn acetate is thermally decomposed (200°C to 350°C for 20 min) to fine ZnO quantum dots as ZnO nanowire seeds. BCKDHB Thermal decomposition step in the air converts Zn acetate into uniform ZnO nanoparticles as well as promotes the adhesion of ZnO seed nanoparticles to the substrate. Alternatively, this thermal decomposition step may be done selectively by focused laser scanning [12]. Zn acetate inkjet printing Instead of spin coating on the whole substrate, inkjet printing method was used to locally deposit and pattern the seed layer. The Zn acetate solution was inkjet printed by a piezo-electrically driven DOD inkjet head integrated with CAD system to draw arbitrary patterns of Zn acetate ink.