“…The first is in accordance with the 139.4 cm −1 mode of Bi 2 S 3 nanorods, specified as the surface phonon vibration [12]. The second corresponds with the vibration mode of Bi 2 S 3 nanorods at 252.0 and 259 cm −1 [12,13] and Bi 2 S 3 nanoribbons and hierarchical nanostructures at 250 cm −1 , specified as the vibration mode of Bi-S bonds [14,15]. The detections of the third and fourth were in accordance with those of Bi 2 S 3 nanorods at 312 and 975 cm −1 [13].…”