Investigation of structural and optical properties of molybdenum disulfide flakes/polyvinylidene fluoride nanocomposites

Enhanced Triboelectric Effects of Self-Poled MoS2-Embedded PVDF Hybrid Nanocomposite Films for Bar-Printed Wearable Triboelectric Nanogenerators

“…Furthermore, it was considered that the positive CH 2 dipoles (δ+) of PVDF and the negatively charged MoS 2 form ion−dipole interactions to induce an extended TTTT conformation aligned on the surface; this results in the formation of the β-crystal phase in PVDF where the negative electrostatic charges of MoS 2 can be used for the enhanced triboelectric effect. 38,43 This explanation is in good agreement with the XRD results. Based on the FTIR analysis, the proportion of the β-crystal phase was determined using the Lambert−Beer law 44…”

“…The presence of sharp and strong peaks in the region of 15–25° indicates partial crystallization of the PVDF, thereby confirming that annealing alone was not sufficient to enhance the degree of crystallization in PVDF. As shown in Figure b, the peaks at 33.6 and 39.9° correspond to the (102) and (103) diffraction planes, respectively, of MoS 2 , which were overlapped with those of the PVDF film upon the incorporation of MoS 2 . Notably, these peaks exhibited low intensities due to the small amounts of MoS 2 present in the MoS 2 @PVDF film.…”

“…The presence of MoS 2 was confirmed by the observation of vibrations at ∼480 cm −1 (Mo−S stretching), 900 cm −1 (S−S stretching), and 1100 cm −1 (O−H stretching), overlapped with the PVDF bands. 38 Notably, MoS 2 peaks were overlapped with PVDF peaks in the MoS 2 @ PVDF hybrid nanocomposite film. The embedding of MoS 2 into the PVDF matrix causes the absorption peaks to be broader and more intense, indicating a partial decrease in crystallinity.…”

“…As shown in Figure 3b, the peaks at 33.6 and 39.9°correspond to the (102) and (103) diffraction planes, respectively, of MoS 2 , which were overlapped with those of the PVDF film upon the incorporation of MoS 2 . 38 Notably, these peaks exhibited low intensities due to the small amounts of MoS 2 present in the MoS 2 @PVDF film. However, a sharp peak at 14°corresponds with the (002) diffraction plane of MoS 2 , thus confirming its presence.…”

“…38 eV upon MoS 2 incorporation. Notably, the lowest energy band gap was observed in the postannealed MoS 2 @PVDF film (5.02 eV).…”