Thermal conductivity and Raman-active vibration properties of TiS3 nanoribbon investigated by temperature-dependent Raman spectroscopy

We have investigated the thermal conductivity and vibration properties of TiS3 nanoribbon via micro-Raman spectroscopy. Based on the Raman spectra, the calculated temperature coefficients of the four A g 1 modes of the TiS3 nanoribbon sample are −0.0140, −0.0136, −0.0179, and −0.0172 cm−1 K−1, respectively, which are higher than that of traditional nanomaterials graphene and MoS2. The Raman frequency shift of TiS3 provides a powerful non-contact method to determine its local temperature rise, which is caused by the anharmonic coupling of phonons. From temperature coefficient and power coefficient values, the in-plane thermal conductivity of the TiS3 supported by SiO2/Si substrate has been calculated to be 187.2 ± 28.9 W/mK with weak anisotropy due to the substrate and size effects. This work paves a way to understand the heat conduction characteristics of transition metal trisulfide.