Raman scattering of true 1D van der Waals Nb2Se9 nanowires

In the present study, the experimental Raman spectrum of niobium‐selenide nanowires (Nb2Se9) is reported for the first time followed by an analysis of the Raman spectrum using the density functional theory (DFT). According to the group‐theoretical analysis, 33 Ag modes were identified as Raman active modes. In the experimental spectrum, 19 well‐resolved Raman modes were observed: 13 modes in the low‐wavenumber range (50–200 cm−1) and six modes in the high‐wavenumber range (220–340 cm−1). The DFT calculations were performed using the local‐density approximation (LDA) functional and generalized gradient approximation (GGA) functional of Perdew–Burke–Ernzerhof (PBE) with van der Waals corrections (PBE‐D3). PBE‐D3 showed better compatibility with the experimental data for the high‐wavenumber range. Our results provide an essential reference for the Raman scattering of newly synthesized Nb2Se9 nanowires and nanodevices in the future. The true one‐dimensional van der Waals material, Nb2Se9 nanowire, was synthesized successfully. We measured the Raman spectra on Nb2Se9 and assigned with simulated Spectra with DFT. This will give useful reference for the studies of lattice dynamics of Nb2Se9 nanowires and one‐dimensional nanomaterials.