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Electrical and piezoresistive properties of DLC with conductive nanoparticles for applications as a sensor material in strain gauges in space structures

Grant number: 20/12450-4
Support Opportunities:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): December 01, 2020
Effective date (End): November 30, 2021
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Vladimir Jesus Trava-Airoldi
Grantee:Rebeca Falcão Borja de Oliveira Correia
Supervisor: Ralf Bandorf
Host Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovações (Brasil). São José dos Campos , SP, Brazil
Research place: Fraunhofer-Gesellschaft, Germany  
Associated to the scholarship:17/08899-3 - DLC films in multilayer with electric conductive nanoparticles for spatial and industrial applications, BP.DD


Diamond-Like Carbon (DLC) films have been extensively applied as a coating in different fields due to their excellent mechanical, chemical and tribological properties. The incorporation of metals in a-C:H films can significantly enhance these properties, expanding their applications as a sensor material in strain gauges. The film with metals (a:C-H:Me) can change the DLC electrical properties and ensure a low temperature dependence. Therefore, in this work a:C-H:Me film will be growth via two different systems. The first system will be used in Brazil via a Plasma-Enhanced Chemical Vapor Deposition (PECVD) modified with an additional cathode. In this case, metallic nanoparticles dispersed in a colloidal solution will be incorporated in the growth chamber via a controlled pulsed valve. The second system will be used at Fraunhofer institute via a combined PECVD/Physical Vapor Deposition (PVD) system using a target as a metal source in an Ar/C2H2 atmosphere. The film obtained from both processes will be characterized in order to apply as a sensor material in strain gauges for application in space structures. Therefore, the films piezoresistive properties will be studied, such as gauge factor and temperature coefficient of resistance; to obtain a high strain sensitivity and a low temperature dependence. Besides, other films properties will also be analyzed, such as chemical composition, morphology, thickness, resistivity, structural quality and compressive stress. (AU)

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