Sm doping effect on structural, morphological, luminescence and antibacterial activity of CdO nanoparticles

Abstract

Undoped cadmium oxide along with samarium doped CdO are synthesized by simple soft precipitation method. Resulting precursor was calcined at 400°C for 2 h. As a result of heating, a pure material was produced. The obtained compound possesses a cubic crystalline structure at nanoscale. Also, FESEM image showed that the resulting material is composed of nanoparticles and its size decreases with increase of Sm doping relative with the particle size calculated from XRD. The photoluminescence shows the emission of violet and blue colour peaks and the peak at 468 nm which is responsible for a better antibacterial activity. The synthesized nanopowders are subjected to two different gram positive (Staphylococcus aureus and Enterococcus faecalis) and two different gram negative (Escherichia coli and Klebsiella pneumoniae) bacterial strains respectively. It is noted that there are high activity of the Sm doped CdO towards gram negative bacteria.

Structural, optical, magnetic, and enhanced antibacterial properties of hydrothermally synthesized Sm-incorporating α-MoO32D-layered nanoplates

“…The antimicrobial activity of the Sm doped α-MoO 3 nanoplates can be explained by three main mechanisms namely: (a) production of enhanced levels of reactive oxygen species (ROS) 98 on the surface of α-MoO 3 nanoplates, (b) release of Mo 6+ ions from the α-MoO 3 nanoplates, and (c) size of the nanomaterials. 96,97,99 Fig. 13 clearly reveals inhibitory zones against bacterial strains, indicating that the Sm-doped α-MoO 3 nanoplates have damaged the bacteria's membrane wall.…”

“…Generally, many transition metal oxides are sportive against micro-organisms due to the interaction of hydrophobic and electrostatic forces. 100 The production of enhanced levels of these ROS can be explained as follows: 96,97,99 when 2D layered nanoplates of pristine and Sm-incorporated α-MoO 3 are exposed to light with the energy of photon equal to or higher than the energy bandgap of the α-MoO 3 semiconductor, electrons from the valence band (VB) are transferred to the conduction band (CB), leaving holes in the valence band (eqn (10)). These excited electrons (e − ) in the CB can be trapped by the oxygen molecules (O 2 ) present on the surface, producing superoxide anion radicals (*O 2 − ) (eqn (11)).…”

Evaluation of Structural, Morphological, Optical and Bactericidal Action of Branched Sm‐Doped CuO Nano‐Lanceolates

“…[3] Several potential new antibacterial active materials have been developed using metal oxides (CuO, ZnO, Pr 2 O 3 , CeO 2 , PbO 2 , TiO 2 , and CdO). [4][5][6][7][8][9][10] CuO is one of the most extensively used metal oxides because it is affordable, easy to produce, and has antibacterial qualities that make it beneficial for biological applications. [4] Bacteria and viruses' cell membranes are susceptible to the release of cations and reactive oxygen species resulting from metallic objects.…”

“…In contrast, concentration under minimum inhibitory concentration (MIC) is frequently observed during anti‐infective therapy and leads to the development of antibiotic resistance [3] . Several potential new antibacterial active materials have been developed using metal oxides (CuO, ZnO, Pr 2 O 3 , CeO 2 , PbO 2 , TiO 2 , and CdO) [4–10] . CuO is one of the most extensively used metal oxides because it is affordable, easy to produce, and has antibacterial qualities that make it beneficial for biological applications [4] .…”

Morphological, Photoluminescence, and Electrical Measurements of Rare-Earth Metal-Doped Cadmium Sulfide Thin Films

“…The doping mechanism is the most popular method for modifying semiconductors’ structural, morphological, optical, and electrical characteristics. Sm and La have been shown to have an essential role in altering the critical optoelectrical characteristics of numerous semiconductor materials, including CdO, TiO 2 , ZnS, and ZnO. − The significant difference in radius and charge between rare-earth trivalent ions (RE 3+ ) and divalent cadmium ions (Cd 2+ ) often impedes the successful integration of RE 3+ into CdS, resulting in suboptimal energy transfers. Although the characteristics of many nanoparticles infused with lanthanide ions have been documented, yet a majority of them should be synthesized using high-temperature methods. , This synthesis typically results in particles devoid of organic groups on their surfaces.…”