Investigation of porous nanoparticle structures under illumination for the application as gas sensors

研究照明下多孔纳米粒子结构作为气体传感器的应用

• 批准号: 419896563
• 负责人: Dr. Nicolae Barsan
• 金额: --
• 依托单位: Fachgebiet Mechanische Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/419896563?language=en
• 关键词: Investigation; porous; nanoparticle; structures; under

Our long-term vision "Photologic" is the realization of a simple and compact sensor device, operated at room temperature, which enables the unambiguous detection of different gases in a gas mixture. The concept is based on a stacked multi-layered nanoparticle structure under illumination, where single layers are selectively activated with adequate wavelengths.While commercial resistive gas sensors are all operated at temperatures around 300°C, the effects of illumination on porous nanoparticle layers are completely different and need to be fundamentally understood for gas sensing and any (photo-) catalytic process in porous particle structures.In contrast to a constant temperature sensor, where the sensing properties are homogeneous across the particle layer, the light intensity within an illuminated layer decreases according to the Beer-Lambert law. Thus, the sensing properties depend on the actual position within the layer. The aim of our proposal is to fundamentally understand how this inhomogeneous illumination distributes within a porous particle layer and how this influences the mechanisms of gas sensing in comparison to the well understood effects in heated devices. By combining experiments and discrete element method (DEM) simulations, we expect to provide significant insights into the effects of illumination on the nanoparticle scale. This structural information would greatly enhance the understanding of the processes in porous nanoparticle layers under illumination. The gained knowledge enables the proof-of-concept for our Photologic device.

我们的长期愿景“Photologic”是实现一种简单紧凑的传感器设备，在室温下操作，能够明确检测气体混合物中的不同气体。这个概念是基于在照明下堆叠的多层纳米颗粒结构，其中单层被选择性地用适当的波长激活。虽然商用电阻式气体传感器都在300°C左右的温度下工作，但照明对多孔纳米颗粒层的影响是完全不同的，需要从根本上理解多孔颗粒结构中的气体传感和任何（光）催化过程。在恒温传感器中，传感特性在整个粒子层上是均匀的，与此相反，根据比尔-朗伯定律，被照射层内的光强度会降低。因此，传感特性取决于层内的实际位置。我们的建议的目的是从根本上理解这种不均匀的照明是如何分布在多孔颗粒层内的，以及与加热装置中众所周知的效应相比，这是如何影响气体传感机制的。通过结合实验和离散元法（DEM）模拟，我们期望对光照对纳米颗粒尺度的影响提供重要的见解。这种结构信息将极大地增强对光照下多孔纳米颗粒层内过程的理解。获得的知识使我们的phoologic设备的概念验证成为可能。