![]() This makes diamond an ideal protective coating material for extreme conditions that include high temperatures, chemical and radiation environments, e.g., as in space and defense applications. Ĭhemical vapor deposited (CVD) diamond is also well known for its excellent material properties such as high thermal conductivity (five times that of copper), optical transparency through most of the optical spectrum, extreme hardness, high Young’s modulus, chemical inertness, and radiation hardness. Several applications of FGO as an optical limiter have already been reported in the literature. These properties open new possibilities to use FGO for a broad range of applications including: as optical limiters and attenuators for lasers and electromagnetic (EM) radiation. Apart from the superior properties of graphene, FGO has additional material properties such as hydrophobicity or amphiphobicity, high thermal conductivity, increased oxidation and thermal stability, and high absorption of optical and microwave energies. These bonds give rise to the electronegative property in FGO to increase polarity and high dielectric loss factor. By the fluorination of GO, C-F covalent bonds are formed. ![]() ![]() Two-dimensional (2D) materials such as graphene and its derivatives like graphene oxide (GO), reduced graphene oxide (rGO), and fluorinated graphene oxide (FGO) are gaining increased attention as potential microwave absorbers due to their large surface area, and superior electronic, mechanical and thermal properties. Ĭarbon-based materials are perceived as interesting EM radiation absorption materials. ![]() In most defense and space applications, there is a need for electromagnetic (EM) radiation absorbing materials that can simultaneously withstand high temperatures, corrosion, and chemical exposure. ![]() Some of the limitations of protective coatings that need to overcome are surface oxidation, mismatch of thermal expansion coefficients, corrosion, and poor mechanical strength. Functionality of these protective coatings under extreme conditions has always been a challenge, as it is difficult to achieve a single reliable solution. Although several protective coating materials exist today, there are limitations in which they are designed and in operation for a specific environment. ![]()
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