Hig-sensitivity Detection of H2S by ZnO Nanowires

基于氧化锌纳米线可以实现对硫化氢非常灵敏的传感器。硫化氢在肺部等疾病的医学诊断和治疗中发挥着越来越重要的作用。在初步实验已经显示出所需的灵敏度降至50 ppb范围后，我们希望在此项目中改进和了解此类传感器的选择性、稳定性和重复性。为此，我们必须详细研究柱子的生长技术，在柱子表面沉积纳米颗粒以提高灵敏度，通过不同制备的传感器阵列的信号相互关联来确保选择性的可能性，如何解决测量过程的可重复启动条件，以及如何加速测量过程。在空气中存在不同混合气体的环境中以及在不同温度下进行的一系列实验中，我们希望加深对氧化锌纳米线表面和下面发生的过程的理解。总体目标是为这项雄心勃勃的诊断任务准备简单可靠的传感器。

Very sensitive sensors for hydrogen sulphide (H2S) can be realized based on zinc oxide (ZnO) nanowires. H2S becomes more and more important in medical diagnosis of lung and other diseases, and also in therapy. After preliminary experiments which have already shown the required sensitivity down to the 50 ppb range, we want to improve and understand the selectivity, stability and reproducibility of such sensors in this project. For this purpose, we have to look in detail into the technology for the growth of pillars, the deposition of nanoparticles on their surface for improved sensitivity, possibilities to ensure selectivity by cross-correlation of the signal of differently prepared arrays of sensors, how to settle reproducible starting conditions for the measurement process, and how to accelerate it. In a series of experiments in an ambient with different mixtures of typical gas-es present in air and also at different temperatures we want to deepen the understanding of the processes going on at and below the surface of the ZnO nanowires. The overall aim is the preparation of simple and reliable sensors for this ambitious diagnosis task.