###### Abstract
Low acoustic loss is also necessary for guiding layer materials for a practical Love wave device [15; 16]. Although polymer waveguide can improve the mass sensitivity and temperature stability of devices [17], its high elastic attenuation will affect the performance of the device. High elastic attenuation means high acoustic loss of polymer waveguide. For a Love wave biosensor based on laser-deposited nanoporous gold sensitive films, the sensitivity and limit of detection (LOD) are considerably improved, compared with that of a dense gold layer [18]. Love wave sensors based on gold nanoparticle-modified polypyrrole show better gas sensing performance than the non-modified systems in dry conditions; the sensing response of the modified systems at room temperature may be attractive in gas detection [19]. For Love wave sensors with nanocrystalline diamond coating [20], the continuous nanocrystalline diamond layers increase the stiffness of the surface; however, the discrete nanocrystalline diamond coating improves entrapment of the Love waves in the guiding layer, which ensures high sensitivity. In the Love mode ammonia device based on graphene oxides (GO), the sensing layer's stiffness is increased due to the oxygen-containing functional groups on the surface of GO, which also enhances the sensitivity and selectivity of the device at room temperature [21]. In most cases, two aluminum interdigital transducers (IDT) are embedded between the waveguide layer and the piezoelectric substrate through photolithography [22; 23; 24]. The acoustic impedance of carbon fiber epoxy composites is comparable to that of Al and SiO\({}_{2}\), which implies low acoustic loss [25; 26]. In addition, the elastic property of CFEC is almost invariable in the range of 25-55 \({}^{\circ}\)C [27]. Further, the density and SH wave velocity of CFEC are also very low. Good temperature stability and high electromechanical coupling are generally required for piezoelectric substrate materials used in practical SH-type surface wave device [28]. In a Love wave device, choosing a piezoelectric substrate with a higher electromechanical coupling coefficient can reduce insertion loss [29]. In recent years, Mn-doped rhombohedral phase ternary single crystal \(y\)Pb(In\({}_{1/2}\)Nb\({}_{1/2}\))O\({}_{3}\)-(1-\(x\)-\(y\))Pb(Mg\({}_{1/3}\)Nb\({}_{2/3}\))O\({}_{3}\)-\(x\)PbTiO\({}_{3}\) (Mn:PIN-PMN-PT) has attracted considerable attention for its excellent piezoelectric properties and high mechanical quality factor [30]. Somepapers have reported that ternary PIN-PMN-PT single crystals have higher Curie temperature and phase-transition temperature (\(T_{\text{C}}\) and \(T_{\text{RT}}\)), which are advantageous for higher temperature applications [31; 32; 33; 34]. Compared with the binary ferroelectric single crystal (such as PMN-PT), the Mn:PIN-PMN-PT single crystal exhibits a lower dielectric loss, smaller pyroelectric coefficient, and smaller relative dielectric permittivity [35]. In addition, the Mn:PIN-PMN-PT single crystals also possess high piezoelectric coefficients and electromechanical coupling [36]. To design high-precision and high-sensitivity Love wave devices with temperature compensation, the relationship between the normalized mass sensitivity and the ambient temperature must be understood clearly. A Love-mode sensor with a CFEC/PMN-PT layered structure has been studied theoretically at room temperature (~25 \({}^{\circ}\)C) [26], the maximum mass sensitivity of which is approximately 3 times that of a traditional SiO\({}_{2}\)/ST quartz configuration sensor. However, compared with the Mn:PIN-PMN-PT ternary single crystal, the temperature stability of the PMN-PT binary single crystal is not good. For the CFEC/PMN-PT structure device, the high mass sensitivity and precision can't be maintained when the temperature changes. This study will address this limitation.