Khalil Ahmed S G, Hartner Sonja, Ali Moazzam, Wiggers Hartmut, Winterer Markus
Nanoparticle Process Technology and CeNIDE, University Duisburg-Essen, Duisburg, Germany.
J Nanosci Nanotechnol. 2011 Dec;11(12):10839-43. doi: 10.1166/jnn.2011.4043.
For the preparation of printed devices based on ZnO nanoparticles (ZnO NPs), stable colloidal dispersions of these materials are highly desirable. ZnO NPs have been synthesized by Chemical Vapor Synthesis. The particles have a spherical shape with a narrow size distribution. Stable aqueous dispersions of the ZnO NPs have been successfully prepared after the addition of a polymeric stabilizer. These stable dispersions have been used to print ZnO NP films on interdigital gold structures on silicon by ink-jet printing. The printing parameters have been optimized for forming layers with high quality. Close-packed ZnO NP thin films with a thickness between 100-250 nm have been prepared. Impedance spectroscopy has been used to study the gas sensing properties of the printed films at different temperatures in air and in hydrogen. The impedance spectra show the semi-circles typical for semiconducting materials. The conductance of the printed films has been measured at room temperature with high accuracy. In hydrogen gas, the conductance is larger as expected and this behavior is reversible.
对于基于氧化锌纳米颗粒（ZnO NPs）制备印刷器件而言，非常需要这些材料的稳定胶体分散体。ZnO NPs已通过化学气相合成法合成。这些颗粒呈球形，尺寸分布狭窄。在添加聚合物稳定剂后，已成功制备出ZnO NPs的稳定水分散体。这些稳定的分散体已用于通过喷墨印刷在硅基叉指金结构上印刷ZnO NP薄膜。已对印刷参数进行了优化，以形成高质量的层。已制备出厚度在100 - 250 nm之间的紧密堆积ZnO NP薄膜。已使用阻抗谱研究印刷薄膜在空气中和氢气中不同温度下的气敏特性。阻抗谱显示出半导体材料典型的半圆。已在室温下高精度测量了印刷薄膜的电导率。在氢气中，电导率如预期的那样更大，并且这种行为是可逆的。
