Cobalt doping effects on photoluminescence, Raman scattering, crystal structure, and magnetic and piezoelectric properties in ZnO single crystals grown from molten hydrous LiOH and NaOH solutions

Simple Fabrication and Characterization of Piezoelectric Nanogenerators from Cobalt-Doped Zinc Oxide Nanofibers

“…The increase of grain size at a certain concentration of doping cobalt was also revealed from previous studies (Lee et al 2002;Bahadur et al, 2010;Benramache et al, 2013;Gandhi et al, 2014;Asikuzun et al, 2015). Therefore, the previous study from (Zhao et al, 2015a) stating that cobalt doping does not significantly affect the lattice parameters and no changes to crystal structures is misleading within the synthesis of Co-doped ZnO NFs by the electrospinning machine.…”

“…Besides Al, Ga, Li, Ni, Cu, Fe and Cr doping; Co-doped ZnO NFs synthesized by electrospinning method is a promising for enhancing the properties of ZnO-based piezoelectric materials fabricated for PENGs. There is a study reported that cobalt doping does not significantly affect their piezoelectric performance, although it induces the paramagnetic state and gives rise to new photoluminescence emission peaks because of small changes in the lattice parameters and no changes to crystal structures (Zhao et al, 2015a). However, cobalt doping into ZnO nanoparticles (NP) synthesized by a coprecipitation method decreased a crystallite size and changed the diamagnetic behavior of ZnO into ferromagnetic nature (Gandhi et al, 2014).…”

Fast Response and High Sensitivity of ZnO Nanowires—Cobalt Phthalocyanine Heterojunction Based H2S Sensor

“…60 According to the group theoretical analysis, the irreducible representation for optical phonons is given by A 1 + 2B 1 + E 1 + 2E 2 , of which the non-polar E 2 modes at ~100cm -1 and ~ 435cm -1 respectively due to the vibrational motion of the Zn sublattice and oxygen atoms forms the two most prominent features in the Raman spectra of our samples. 61 As seen from Figure 13(b), up to 15 nm thickness of CoPc, no Raman peaks that could be assigned to the CoPc layer were observed.…”

“…Figure (a) and (b) respectively shows the Raman spectra in two different wavenumber regions of ZnO-CoPc heterojunction films. The ZnO lattice existing in Wurtzite structure has P63mc symmetry and contains two formula units in each primitive cell . According to the group theoretical analysis, the irreducible representation for optical phonons is given by A 1 + 2B 1 + E 1 + 2E 2 , of which the nonpolar E 2 modes at ∼100 cm –1 and ∼435 cm –1 respectively due to the vibrational motion of the Zn sublattice and oxygen atoms forms the two most prominent features in the Raman spectra of our samples .…”

Multiscalar Investigation of FeVO4 Conversion Cathode for a Low Concentration Zn(CF3SO3)2 Rechargeable Zn‐Ion Aqueous Battery

“…[40][41] In the subsequent cycles (4C, 4D, 10C, 10D), the characteristic FeVO4 peaks do not appear back, indicating that the amorphization of FeVO4 in the first discharge was irreversible, as also observed in Li-FeVO4 system. [54] Additionally, three new phases: ZnO (PDF-01-083-6338), [55] metallic Fe (PDF-04-017-1577), [56] and Zn3V2O7(OH)2⋅2H2O (PDF-00-057-0572), [57] were detected in the cycled electrodes as discussed below.…”