Studies on the High-Temperature Piezoresistivity of Carbon Containing Silicon Oxycarbide Nanocomposites

含碳碳氧化硅纳米复合材料的高温压阻性能研究

• 批准号: 232234385
• 负责人: Professor Ralf Riedel
• 金额: --
• 依托单位: Fachgebiet Mess- und Sensortechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/232234385?language=en
• 关键词: Studies; Temperature; Piezoresistivity; Carbon; Containing

The interdisciplinary project -Studies on the High-Temperature Piezoresistivity of Carbon-Containing Silicon Oxycarbide Nanocomposites- focuses on Polymer-Derived Ceramics, here SiOC-nanocomposites, whose piezoresistive properties have been explored only rudimentary so far. Two types of complementary studies are intended to obtain a thorough understanding of the piezoresistive effect in these materials: Firstly, structural (e.g., X-ray diffraction, SEM, TEM) and spectroscopic investigations (Raman, FTIR spectroscopy) to reveal the structure-property relationship within the materials (DF) and, secondly, application-oriented investigations to encourage the development of new force/pressure sensors with superior properties at high temperature and in harsh environments (MuST). Prerequisite for these studies is the synthesis of SiOC-nanocomposites with defined carbon content and carbon microstructure. The carbon content will be varied between 1 and 30 vol % by using different polymeric precursors; the phase composition/microstructure is adjusted by means of pressureless or hot-pressing processing techniques. In-situ Raman and force and pressure-dependent resistivity measurements are carried out to provide information on the correlation of the piezoresistive effect with the local and electronic structure of the carbon phase.The temperature dependence of the sample resistivity and of piezoresistive effect will deliver important information about the underlying basic mechanism and will be used to discriminate between different models (tunneling percolation, hopping transport, etc.).The phenomenological application-oriented second part of the project consists of the build-up of special equipment for precise assessment of the piezoresistive effect, its quantification by the Gauge-Factor and the comparison to well-established sensor arrangements. Experiments on the long term stability and reproducibility will be performed in order to determine whether these materials are potential candidates for new pressure sensing devices at unusual conditions (high temperatures, harsh environments). Due to their outstanding properties, e.g. thermal and chemical stability as well as excellent creep resistance, these materials will allow a substantial extension of the operation pressure and temperature range of piezoresistive sensors, beyond the current state-of-the-art.

跨学科项目-含碳硅氧碳化物纳米复合材料的高温压阻性研究-重点关注聚合物衍生陶瓷，这里的sioc纳米复合材料，其压阻性能迄今为止只进行了初步的探索。两种类型的互补研究旨在获得对这些材料的压阻效应的透彻理解：首先，结构（如x射线衍射，SEM， TEM）和光谱研究（拉曼，傅里叶红外光谱）揭示材料内部的结构-性能关系（DF），其次，面向应用的研究，以鼓励开发在高温和恶劣环境下具有优越性能的新型力/压力传感器（MuST）。这些研究的前提是合成具有明确碳含量和碳微观结构的sioc -纳米复合材料。通过使用不同的聚合物前体，碳含量将在1至30 vol %之间变化；通过无压或热压加工技术调整相组成/微观结构。现场拉曼和力和压力相关的电阻率测量进行，以提供压阻效应与碳相的局部和电子结构的相关性信息。样品电阻率和压阻效应的温度依赖性将提供有关潜在基本机制的重要信息，并将用于区分不同的模型（隧道渗流，跳跃输运等）。该项目面向现象学应用的第二部分包括建立用于精确评估压阻效应的专用设备，通过Gauge-Factor对其进行量化，并与已建立的传感器安排进行比较。将进行长期稳定性和可重复性实验，以确定这些材料是否在不寻常条件下（高温、恶劣环境）作为新型压力传感装置的潜在候选材料。由于其优异的性能，例如热稳定性和化学稳定性以及优异的抗蠕变性能，这些材料将大大扩展压阻式传感器的工作压力和温度范围，超出目前最先进的水平。