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Figure 2. Characterization of FeNiS₂ QDs@SPAN and SPAN. SEM images of (A) FeNiS₂ QDs@SPAN, (B and C) HR-TEM image of FeNiS₂ QDs@SPAN with an inset in (D) showing the corresponding FFT pattern; (E-H) TEM images along with EDS elemental mapping of FeNiS₂ QDs@SPAN composite; (I) XRD patterns of SPAN and FeNiS₂ QDs@SPAN; (J) FT-IR and (K) Raman spectra of SPAN and FeNiS₂ QDs@SPAN, respectively. QDs: Quantum dots; SPAN: sulfurized polyacrylonitrile; EDS: energy-dispersive X-ray spectroscopy; XRD: X-ray diffraction; FT-IR: fourier transform infrared spectroscopy; HR-TEM: high-resolution transmission electron microscopy; FFT: fast fourier transform.