The comparison of antibacterial activities of CsPbBr3 and ZnO nanoparticles

Abstract

All-inorganic cesium lead bromide (CsPbBr 3) perovskite nanoparticles and ZnO nanoparticles were synthesized. The structure, optical properties and the morphology of synthesized nanoparticles were fully characterized using X-ray diffraction (XRD), UV/Vis spectroscopy and transition electron microscopy (TEM). A comparative study was carried out to investigate the antibacterial activity of ZnO and CsPbBr 3 perovskite nanoparticles toward Gram-negative, rod-shaped Escherichia coli O157:H7 bacteria cells. Experimental results showed that the antibacterial activity of CsPbBr 3 nanoparticles was better than that of ZnO nanoparticles.

Fabrication, characterization, and antibacterial activity of ferrite, chromite, and aluminate nanoparticles

“…Moreover, the optical properties of NPs could influence their antibacterial activity. For instance, the higher absorbance peak intensity led to more production of excitons, more ROS generation, strengthening the inhibitory effect [93,94]. Sagayaraj et al [132] revealed an inverse relationship between E g and antibacterial activity, which is consistent with our findings.…”

“…Furthermore, the smallest D XRD of sample A may also contribute to reduce its E g more than that of samples F and C, as obtained by Akhiruddin et al [97]. It was stated by Akbari et al [94] that the narrow E g improved the antibacterial potential of the sample. Moreover, the presence of disorder in the NP's structure is indicated by the appearance of a tail, known as the Urbach tail, in the absorption spectrum [98].…”

“…This weakness in the absorption edge can be attributed to the formation of the secondary phase, as reported by Munawar et al [92]. Moreover, the intensity of the absorbance peak is highest for sample A and lowest for sample F. The higher absorbance peak intensity indicates the more free excitons are created, which is beneficial for bacterial growth inhibition [93,94]. Furthermore, the energy gap (E g ) of the tested samples can be calculated using Tauc's equation [93]:…”

Cs2AgBiBr6 Quantum Dots Supported on Co3O4 Nanocages for Acetone Detection at Room Temperature

“…To accurately determine the band gap of the synthesized material, the optical behavior of Co 3 O 4 , CABB QDs, and CABB QDs-Co 3 O 4 in the wavelength range of 200–700 nm was tested by UV–vis, as shown in Figure S7a–c (Supporting Information). In addition, Moreover, the optical band gaps of Co 3 O 4 , CABB QDs, and CABB QDs-Co 3 O 4 were calculated using Tauc’s equation: false( α h normalv false) 2 = A ( h v − E normalg ) where α is the absorption coefficient, h ν is the photon energy, A is a constant, and E g is the band gap energy. The calculated optical band gap energies of Co 3 O 4 and CABB QDs and CABB QDs-Co 3 O 4 are about 1.51, 1.94, and 1.41 eV, respectively.…”

Ambient Stable CsPbBr3/ZnO Nanostructures for Ethanolamine Sensing

“…In order to accurately determine the band gap of the synthesized material, the optical behaviors of ZnO and CsPbBr 3 -2MPA in the wavelength range of 240–640 nm were tested by UV/Vis absorption spectroscopy, as shown in Figure S5b. Moreover, the optical band gaps of ZnO and CsPbBr 3 were calculated using Tauc’s equation where α is the absorption coefficient, h ν is the photon energy, A is a constant, and E g is the band gap energy. The calculated optical band gap energy of ZnO and CsPbBr 3 -2MPA is about 3.20 and 2.31 eV, respectively.…”