Direct Production of a Novel Iron‐Based Nanocomposite from the Laser Pyrolysis of Fe(CO)₅/MMA Mixtures: Structural and Sensing Properties

Abstract

Iron/iron oxide-based nanocomposites were prepared by IR laser sensitized pyrolysis ofFe(CO)5and methyl methacrylate (MMA) mixtures. The morphology of nanopowder analyzed by TEM indicated that mainly core-shell structures were obtained. X-ray diffraction techniques evidence the cores as formed mainly by iron/iron oxide crystalline phases. A partially degraded (carbonized) polymeric matrix is suggested for the coverage of the metallic particles. The nanocomposite structure at the variation of the laser density and of the MMA flow was studied. The new materials prepared as thick films were tested for their potential for acting as gas sensors. The temporal variation of the electrical resistance in presence ofNO2, CO, andCO2, in dry and humid air was recorded. Preliminary results show that the samples obtained at higher laser power density exhibit rather high sensitivity towardsNO2detection andNO2selectivity relatively to CO andCO2. An optimum working temperature of200°Cwas found.

Synthesis and Characterization of Carbon/Nitrogen/Iron Based Nanoparticles by Laser Pyrolysis as Non-Noble Metal Electrocatalysts for Oxygen Reduction

“…For example, laser pyrolysis has been used for the synthesis of various kinds of materials such as carbides [11,12], nitrides [13], oxides [14][15][16][17] or silicon [18], using ethylene, ammonia or silane as both absorbing and precursor compounds. Such materials covered numerous applications related to mechanical properties enhancement, photovoltaics, energy storage, labelling for bio-medical application and sensors.…”

Characterization and reusability suggestions of the sludge generated from a synthetic acid mine drainage treatment using sodium ferrate (VI)

“…Vonsenite and hematite or magnetite (oxides of iron) minerals as reference material of similar shape were also present in the sludge, which is highly composed by a group of ferrous, magnesium and ferric ions, and sometimes might contain a small amount of nickel, aluminium, manganese, calcium, potassium, and silicon. The diffraction peak observed at 46° is attributed to the characteristic low crystalline metallic iron ( Yavuz et al., 2006 ; Alexandrescu et al., 2010 ) while the characteristic peaks observed at 28°, 33°, 57°,67°, and 75° of the sludge might be ascribed to the α-Fe(OOH) ( Varanda et al., 2002 ).…”

“…: magnetic cancrinite), magnetized multiwall carbon nanotubes, nano-zero valent iron (Fe 0 ), and iron/iron oxide-based nanocomposites (e.g. : α-Fe 2 O 3 –TiO 2 nanocomposite) due to its high composition especially in Fe and O ( Alexandrescu et al., 2010 ; Badi et al., 2015 , 2018 ; Yousefzadeh et al., 2018 ; Bian et al., 2019 ).…”

“…The FT-IR spectrum results confirm the formation and presence of different minerals in the sludge as indicated by the XRD data. The peaks found at 619.96 cm −1 are attributable to the metal oxides (such as iron oxide), which usually appear between 400 and 650 cm −1 ( Alexandrescu et al., 2010 ; Mahmoud, 2017 ; Ahmadi et al., 2020 ), the peaks 1426.24, 1639.39 and 1730.92 cm −1 might correspond to S=O vibration stretching of different sulphate minerals ( Kefeni and Mamba, 2020 ). The peak observed at 3315.94 cm −1 is ascribed to ν-OH due to water in the sludge ( Flores et al., 2019 ).…”