Influence of Carbon Modification on the Morphological, Structural, and Optical Properties of Zinc Oxide Nanoparticles Synthesized by Pneumatic Spray Pyrolysis Technique

Abstract

This paper reveals the influence of doping on the morphological, structural, and optical properties of zinc oxide (ZnO) nanoparticles (NPs) synthesized by pneumatic spray pyrolysis technique (PSP), using zinc ethoxide ZnO2CH32 as the precursor. The prepared samples were characterized by XRD, HRTEM, SEM-EDX, UV-Vis spectroscopy, and RS. RS analysis has revealed that the unmodified ZnO and carbon modified ZnO samples have characteristic Raman optic modes at 325 cm−1, 373 cm−1, and 432 cm−1 belonging to Wurtzite ZnO structure. The XRD ZnO (C:ZnO) NPS have characteristic peaks of hexagonal Wurtzite ZnO structure. HRTEM analysis has revealed that the synthesized ZnO NPs have particle size range of 8.8–11.82 nm. EDX spectra of both unmodified and modified ZnO nanoparticles have revealed prominent peaks at 0.51 keV, 1.01 keV, 1.49 keV, 8.87 keV, and 9.86 keV. The occurrence of these peaks in the EDX spectra endorses the existence of Zn and O atoms in the PSP synthesized ZnO NPs. The UV-Vis spectroscopy has revealed a red shift of the absorption edge, with the increase in C dopant level. The effect of nanocrystallite size and the gradual prominence of C into ZnO matrix due to increase in C dopant level in the PSP synthesized ZnO NPs was meticulously elaborated through Raman spectroscopy analysis.

One-Step Synthesized ZnO np-Based Optical Sensors for Detection of Aldicarb via a Photoinduced Electron Transfer Route

“…In this structure, there was a significant peak centered at around 435 cm –1 . This peak corresponds to the wurtzite structure of ZnO with the E 2 high mode that is associated with the vibration of the O and Zn atoms . The peak at 326 cm –1 corresponds to the second-order E 2 mode, whereas the peak at 384 cm –1 corresponds to the second-order A 1 (TO) mode .…”

The catalytic decomposition of carbon dioxide on zinc‐exchanged Y‐zeolite at low temperatures

“…Hence the observed decrease in the diffraction peak intensity could be due to the pore filling effect imparted by zinc 22 . However, the slight shift in 2 θ values after carbon dioxide decomposition is due to an increase in the crystallite size caused by the presence of carbon in the Zn‐NaY zeolite 23 . In addition, the high‐temperature condition during hydrogen treatment does not cause any change in the structure as X‐ray diffraction studies, providing strong evidence of thermal stability of the zeolites.…”

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

“…The presence of a thermal difference probably enhanced the directional arrangement of nanosheets of Bi 0.5 Sb 1.5 Te 3 , which is advantageous for improving the thermoelectric properties. The highest figure of merit was found to be 0.86 at 373 K. 165 The Seebeck coefficient of prepared polythiophene (P Th )/Bi 2 Te 3 was determined to be negative over the whole temperature range, and the highest value was found to be 130 μV/K. The decrease in carrier concentration and electrical resistivity was due to the poor conductivity of the polymer, which resulted in a ZT of 0.17 at 473 K. 166 A widely used and facile hydrothermal approach was carried out for bismuth telluride nanorods with nanoplates stacks.…”