## 1 Introduction
Analytical results showed strain-dependent damping enhancement due to stick-slip motion at the interfaces of the SWCNTs and the resin. Other nanofillers utilized for vibration damping are zinc oxide (ZnO) nanowires. With a wurtzite structure, these nanowires possess excellent pyroelectric and piezoelectric properties, besides being semiconductors [25; 26]. They also take various morphologies, such as nanorings, nanocombs, nanobelts, nanorods, nanosprings, and nanocages [27]. Methods to grow them on various substrates include CVD, electrodeposition, and hydrothermal growth [28; 29; 30; 31; 32; 33]. Most of these methods require deposition of a self-seeding layer on the substrate before growth initiation. Also, the growth temperatures are high for some of these procedures, such as the case of chemical vapor deposition (CVD). Thus, hydrothermal routes are ideal for carbon fiber substrates. In this procedure, growth is carried out in the presence of zinc salts, such as zinc nitrate hexahydrate, zinc acetate, zinc chloride, or zinc acetate dehydrate [34; 35; 36; 37; 38; 39]. It was also shown that hexamethylenettermine (HMTA) plays a dual role of pH regulation and forcing the vertical growth of zinc nanorods along the c-axis by inhibiting any lateral growth [40]. It has been reported by [PERSON] et al. [41] that nanorods at the interface of CFRPs enhance loss modulus by 50%, thus improving the damping properties of the composite. When damping properties are collected in abundance during dynamic mechanical analysis (DMA), these data can be utilized to predict the thermal activation energy, and thus, the creep behavior of the material. [PERSON] et al. [42] examined the operating temperatures of the CFRPs used in structural pipe repair using this procedure. Industrial grade CFRPs were fabricated and cured at a temperature range between 35 and 170 \({}^{\circ}\)C. Calculation of the glass transition temperature, \(T_{g}\), and variation under different curing and vibration conditions helped estimate safe operating temperatures for the CFRP materials during pipe maintenance. The glass transition temperature represents the threshold for deterioration of material properties, such as fracture toughness, strength, and stiffness. It was concluded that the material should be cured at higher temperatures to increase the \(T_{g}\) for servicing at higher temperatures. [PERSON] et al. [43] described the procedures to determine thermal activation energy of an epoxy from the \(T_{g}\) values obtained from the DMA results. They concluded that the data based on loss tangent was more reliable compared to the data from loss modulus for the calculation of thermal activation energy at lower frequencies. The activation energy values increased at higher frequencies. The importance of constant heating rates to systematically compensate the error resulting from the measured sample temperatures was discussed by [PERSON] [44]. Theoretical insight into the Arrhenius equation used for the calculation of thermal activation energy was provided in this paper. This equation, along with [PERSON]'s free energy approach, are frequently used to model creep [45]. Thermal activation energy is an essential parameter necessary to determine creep in all these models. Thus, determination of this parameter is crucial for modeling creep behavior in the new hierarchical composites [46]. This investigation focuses on revealing the changes in the dynamic mechanical properties and activation energy of a woven CFRP as consequences of adding CNTs and ZnO nanofillers, individually or combined, at the interface of The CFRPs. In our previous work [47], the addition of Bucky paper and ZnO nanorods was studied. The planar orientation of CNTs in Bucky paper resulted in a weak adhesion to the epoxy matrix at the interface. Thus, in the current study a different technique to deposit CNTs is adopted. In addition to the damping properties, the activation energy of each configuration of composites is estimated.