Synthesis, Optical, and Structural Studies of Iron Sulphide Nanoparticles and Iron Sulphide Hydroxyethyl Cellulose Nanocomposites from Bis-(Dithiocarbamato)Iron(II) Single-Source Precursors

Abstract

In this study, Fe(II) complexes of phenyldithiocarbamate, dimethyldithiocarbamate and imidazolyldithiocarbamate were used as single-source precursors to prepare iron sulphide nanoparticles by thermolysis in oleic acid/octadecylamine (ODA) at 180 °C. The nanoparticles were dispersed into hydroxyethyl cellulose (HEC) to prepare iron sulphide/HEC nanocomposites. Ultraviolet-Visible (UV-Vis), Photoluminescence (PL), Fourier Transform Infrared (FTIR), powder X-ray diffraction (pXRD), high-resolution transmission electron microscopy (HRTEM), Field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDS) were used to characterize the iron sulphide nanoparticles and corresponding HEC nanocomposites. The absorption spectra studies revealed that the nanoparticles were blue shifted due to quantum confinement and the optical band gaps of the nanoparticles are 4.85 eV for FeS1, 4.36 eV for FeS2, and 4.77 eV for FeS3. The emission maxima are red-shifted and broader for the nanoparticles prepared from phenyldithiocarbamate. Rod-like and spherically shaped iron sulphide particles were observed from the HRTEM images. The crystallite sizes from the HRTEM images are 23.90–38.89 nm for FeS1, 4.50–10.50 nm for FeS2, and 6.05–6.19 nm for FeS3 iron sulphide nanoparticles, respectively. pXRD diffraction patterns confirmed that FeS1 is in the pyrrhotite-4M crystalline phase, FeS2 is in the pyrrhotite phase, and FeS3 is in the troilite phase of iron sulphide. The phases of the iron sulphide nanoparticles indicate that the nature of the precursor complex affects the obtained crystalline phase. FTIR spectra studies confirmed the incorporation of the nanoparticles in the HEC matrix by the slight shift of the O–H and C–O bonds and the intense peaks on the nanoparticles. FESEM images of the iron sulphide nanoparticles showed flake-like or leaf-like morphologies with some hollow spheres. The EDS confirmed the formation of iron sulphide nanoparticles by showing the peaks of Fe and S.

Cobalt(II) Metal-organic Framework as Scintillating Material

“…The analytical and physical data, melting point, and elemental analysis [14] of the synthesized compound and its ligands are tabulated [14,15] in Table 1. The CHNOM calculated theoretical values were in good agreement with the experimental values.…”

“…The morphology of the complex was examined by scanning electron microscopy using Joel JEM-5200 operating at an acceleration voltage of 20 KeV [30] in a magnification range of 300-80 µm. The emission spectrum of the particles was recorded on a Perkin Elmer [31] LS 45 fluorescence spectrometer (Waltham, MA, USA), and the data were collected at room temperature [14]. The particle properties data were calculated based on weight and count.…”

“…The cumulative percentage (%) PSDs show a sigmoid curve (Table S1). Figure 4b shows the particle distribution [12][13][14] of Co-MOF. The particle size distribution of Co-MOF in the wide range area is an indication of a long-range ordered structure with high surface area and possible high adsorption capacity which can give room for specific functionalities.…”

“…These properties present unique advantages of MOFs for radiation detection [4] over existing organic scintillator materials [11]. MOFs as scintillators are utilized in molecule detectors [10][11][12][13][14][15][16][17][18], energy resource investigation [19], X-ray beam security, nuclear cameras, processed tomography [10], gas investigation, and radiation estimation and monitoring [1]. The electronic and structural features [6] of metal-organic frameworks furnish essential perception into their scintillating properties [20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

FeS Encapsulated Chitosan Graft Polyacrylamide Nanocomposite for the Uptake of Model Anionic Eosin Y from Water: Isotherm, Kinetics and Equilibrium Studies.

“…The SAED pattern of FeS (Fig. 3D) showed small spots forming rings ascribed to the Bragg re ections from the individual crystallite of the FeS nanoparticle indicating polycrystalline nature of the particles [36].…”