Substructural investigations, Raman, and FTIR spectroscopies of nanocrystalline ZnO films deposited by pulsed spray pyrolysis

Abstract

Nanocrystalline ZnO films were deposited onto glass substrates in the temperature range of 473-673 K using pulsed spray pyrolysis. The structural, substructural, and optical properties of the films were investigated by means of X-ray diffraction analysis, Raman scattering, and Fourier transform infrared (FTIR) spectroscopy. The effect of the substrate temperature (T s ) on the coherent scattering domain (CSD) sizes L, microstrains e, and microstress s grades, and the average density of dislocations r in the films were estimated through the broadening of X-ray lines using the Cauchy and Gauss approximations and the threefold function convolution method. The ZnO films grown at T s ¼ 623-673 K possessed the highest values of L, and the lowest of e, s, and r, indicating high-crystalline quality. The Raman spectra showed peaks located at 95-98, 333-336, 415, 439-442, 572, and 578-584 cm À1 , which were interpreted as E 2 low (Zn), (E 2 high ÀE 2 low ), E 1 (TO), E 2 high (O), A 1 (LO) and E 1 (LO) phonon modes of the ZnO wurtzite phase. The FTIR spectra showed relatively weak signals at 856, 1405, and 1560 cm À1 , corresponding to the C-H and C-O stretching modes, in addition to the main Zn-O mode at 475 cm À1 , indicating a low content of precursor residues.

Tuning the Morphology and Properties of Nanostructured Cu-ZnO Thin Films Using a Two-Step Sputtering Technique

“…High −E 2 Low mode at approximately 344 cm −1 and the E 1 (LO) mode at approximately 596 cm −1 , which are similar to previous reports [34,35]. As the doping rate changed, the intensity and position of the E 1 (LO) peak changed slightly.…”

“…As the doping rate changed, the intensity and position of the E 1 (LO) peak changed slightly. Though many previous studies have found that the E 2 High mode is the major peak in hexagonal ZnO [12,16,19,[34][35][36][37][38], we could only observe its trace in the E 2 High −E 2 Low mode.…”

Nanostructured ZnO, Cu2ZnSnS4, Cd1−xZnxTe Thin Films Obtained by Spray Pyrolysis Method

“…Table 1 presents the overview of deposition conditions and precursors typically used to deposit the ZnO, CZTS, and CZT films by spray pyrolysis technique. 7heating plate [18,19].…”

Nanostructured ZnO films for potential use in LPG gas sensors

“…XRD patterns were normalized to the intensity of the (002) peak of the hexagonal ZnO phase. Phase analysis was performed by comparing interplanar distances and relative intensities of the investigated samples with the standard according to JCPDS 79-0207 [23].…”

“…It is known, that ZnO formation method (chemical or physical) has strong effect on the structural-phase state of the samples and the ensemble of the defects [22][23][24], which in turn, determine the structure dependent sensor properties of the material. It can be assumed, that these characteristics also affect the gas sensor properties of ZnO.…”