Morphology, optical, and photoelectrochemical properties of electrodeposited nanocrystalline ZnO films sensitized with Cd x Zn1−x S nanoparticles

ZnO and Ag NP-decorated ZnO nanoflowers: green synthesis using Ganoderma lucidum aqueous extract and characterization

“…35 In the NPs, the LO peak and its overtones usually dominate the Raman spectrum under the resonant excitation with a 325 nm laser source. 4,36,37 The moderate intensity of the LO and 2LO features and their comparable intensity in our non-resonant spectra are fully consistent with the 12–13 nm size of the nanocrystallites obtained from the XRD measurements.…”

“…ZnO, including ZnO nanoparticles and microstructures, has attracted the steady interest of researchers for decades. [1][2][3] The variety of its applications explains the need for different approaches to its synthesis [3][4][5][6][7][8][9][10][11] and the formation of its heterostructures with semiconductor or metal nanostructures. [4][5][6] Green chemistry approaches to nanoparticle (NP) production have the advantages of eco-friendly and hazard-free manufacturing, and economic and time-effective biosynthesis.…”

Synthesis, optical properties, and photochemical activity of zinc-indium-sulfide nanoplates

“…An alternative origin of the 345 cm À1 Raman mode in the spectra of our ZnIn 2 S 4 nanoplates could be nanosized ZnS inclusions, because the main resonant Raman peak of small ZnS crystallites occurs in the range of 345-350 cm À1 and is due to longitudinal optical (LO) vibrations. 38 However, at the resonant excitation of II-VI nanocrystals (l exc ¼ 325 nm for ZnS), also a second order peak (2LO) at approximately double the frequency is usually observed, 38 even in alloys 39 and ultrasmall crystallites (<2 nm). 40 The latter proves to be an efficient way of determining ZnS precipitations in multicomponent crystals, for example Cu 2 -ZnSnS 4 .…”

Room-Temperature Electron Paramagnetic Resonance Study of a Copper-Related Defect in Cu2ZnSnS4 Colloidal Nanocrystals

“…21 Figure 2 shows Raman spectra of CZTS NCs at λ exc = 514.7 nm, which is resonant for CZTS and potential secondary phases of Cu x S and Cu x SnS y , 33,34 and at λ exc = 325 nm, which selectively enhances signals from potential minor wide band gap inclusions such as ZnS and ZnO. 35 All the peaks observed at λ exc = 514.7 nm can be assigned to kesterite CZTS, in particular, the characteristic first-order peak at 332 cm −1 of A 1 symmetry (corresponding to an S−S vibration with the cations at rest) and higher-order phonon scattering peaks at 658 and 995 cm −1 . The spectrum recorded at 514.7 nm agrees well with the spectrum of crystalline bulk Cu 2 ZnSnS 4 of the kesterite modification.…”