FRG: Electronic Properties of Polymer-Derived Amorphous Ceramics

非技术描述：聚合物衍生陶瓷是一类新的高温陶瓷，通过聚合物前体的直接热分解合成。与传统陶瓷相比，聚合物衍生陶瓷具有一系列优异的热机械和电子性能，以及灵活的加工条件。这些材料适用于许多能源、空间和军事应用。例子包括用于检测升高的温度、高温下的压力和辐射环境的微传感器。了解聚合物衍生陶瓷的结构-电子性质关系可以作为进一步设计更好的传感器和开发新的多功能材料的指导。对学生的培训将有助于为美国下一代材料和相关行业的科学家和工程师做好准备，并保持和加强美国在这一前沿领域的领导地位。 技术专长：通过调整聚合物前体的化学性质，将合成具有系统变化的结构/组成的聚合物衍生陶瓷。核磁共振，傅里叶变换推断光谱，拉曼光谱，小角X-射线散射，高分辨率透射电子显微镜，和扫描隧道显微镜将被用来研究的聚合物衍生的陶瓷合成精心定制的前体的结构。电子顺磁共振和光学光谱将用于研究材料的电子和缺陷结构。结构信息将与聚合物衍生陶瓷的电子行为有关，其特征在于通过测量其电导率、霍尔效应和压阻率。拟议的研究将能够更好地调整材料特性以满足不同的技术需求，并为创造新材料提供机会。拟议的研究还将为在新兴技术应用中使用这类新材料提供指导，例如高温微传感器。研究生将接受使用所有上述最先进技术的培训。他们还将有机会在夏季在国家实验室或工业界进行研究。该项目还将通过让本科生参与专门设计的研究项目来培训他们。

NON-TECHNICAL DESCRIPTION:Polymer-derived ceramics are a new class of high temperature ceramics synthesized by direct thermal decomposition of a polymeric precursor. Compared to conventional ceramics, polymer-derived ceramics possess a set of excellent thermo-mechanical and electronic properties, as well as having flexible processing conditions. These materials are suitable for many energy, space and military applications. Examples include micro-sensors for detecting elevated temperatures, pressures at high temperature, and radiation environments. Understanding the structure-electronic property relationships of polymer-derived ceramics could serve as a guide for further design of better sensors and for the development of new multifunctional materials. Training of students will help to prepare America's next generation of scientists and engineers for materials and related industries, and to maintain and enhance U.S. leadership in this cutting-edge area. TECHNICAL DETAILS:Polymer-derived ceramics with systematically varied structures/compositions will be synthesized by tailoring the chemistry of the polymeric precursors. Nuclear magnetic resonance, Fourier transform inferred spectroscopy, Raman spectroscopy, small angle x-ray scattering, high resolution transmission electron microscopy, and scanning tunneling microscopy will be utilized to study the structures of polymer-derived ceramics synthesized from carefully tailored precursors. Electron paramagnetic resonance and optical spectroscopy will be used to investigate the electronic and defect structures of the materials. The structural information will be related to the electronic behavior of polymer-derived ceramics, which will be characterized by measuring their conductivity, Hall effect and piezoresistivity. The proposed research will enable better tuning of the material properties to different technical needs, and present opportunities for creating new materials. The proposed research will also provide a guideline for using this new class of materials in emerging technical applications, such as, high-temperature micro-sensors. Graduate students will be trained in the use of all of the aforementioned state-of-the-art techniques. They will also have the opportunity during summers to carry out research in national laboratories or industry. This project will also train undergraduate students by involving them into specially-designed research programs.