Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

Abstract

Zinc oxide nanopowders were synthesized by the simple sol-gel method from an ethanol solution of zinc nitrate hexahydrate. Structural and surface morphological investigations were carried out using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible (UV-Vis) spectrophotometry analyses. XRD pattern showed that the zinc oxide nanoparticles exhibited hexagonal wurtzite structure. A multiple-layered structure of obelisk-shaped ZnO nanoparticles was achieved after calcinations. The average particle size of ZnO was around 20 nm as estimated by direct HRTEM observation. The size of sphere-like shaped ZnO nanoparticles was measured in the range of 20-80 nm and the size of pyramid-like shaped annealed samples was achieved in the range of 40-100 nm with less agglomeration. The energy dispersive spectroscopy spectrum showed peaks of zinc and oxygen. The sharp peaks in FTIR spectrum determined the Zn-O stretching and absorbance peak of UV-Vis spectrum showed the wide bandgap energy of 3.35 eV.

Structural, optical, thermoelectrical, and magnetic study of Zn1‐xCoxO (0 ≤ x ≤ 0.10) nanocrystals

“…Recently many investigations have been performed on the n‐type semiconductor ZnO because it has a direct and wide‐band gap energy (3.37 eV) at room temperature with a large exciton binding energy (60 meV) . Furthermore, owing to its high thermal stability, nontoxic nature, and its low‐cost, ZnO has a wide range of optical, electronic, and thermoelectric applications .…”

“…Recently many investigations have been performed on the n-type semiconductor ZnO because it has a direct and wide-band gap energy (3.37 eV) at room temperature with a large exciton binding energy (60 meV). [1][2][3][4][5][6] Furthermore, owing to its high thermal stability, nontoxic nature, and its low-cost, ZnO has a wide range of optical, electronic, and thermoelectric applications. [7][8][9] ZnO nanoparticles (NPs) have also received acclaim as a potential candidate for solar energy conversion cells, transparent transistors, catalysts, light-emitting diodes, spintronic devices as well as various drug-delivery and antibacterial uses.…”

Characterization of different forms of vulcanized natural rubbers as elastomer spacer and toughening agent in two‐matrix filled epoxy/natural rubber/graphene nano‐platelets system

“…The single amorphous and broad peak indicated the highly amorphous nature of epoxy matrix . In addition, XRD patterns of filled epoxy systems (NR, LNR, and rNR) showed three basal reflection peaks at the 2θ of about 31.9°, 34.5°, and 36.4° corresponding to (1 0 0), (0 0 2), and (1 0 1) lattice planes of the hexagonal wurtzite structure of zinc oxide (ZnO), respectively . The intensity of these three peaks is related to structurally changing of ZnO, which is involved in the vulcanization process of rubber phases …”

Study of α-Fe2O3@ ZnO nanoleaves: Morphological and optical study

“…Metal oxide semiconductors (MOS) are recognized as the best option for electronic and industry applications [1][2][3][4][5] . The MOS examples such as TiO 2 [6][7][8][9][10] , CeO 2 [11][12][13][14] , Fe 2 O 3 [15][16][17][18] , ZnO [19][20][21] , Al 2 O 3 [22][23][24][25] , V 2 O 5 [26][27][28][29][30] , Co 2 O 3 [31][32][33] , and composites such as FeCo [34][35][36] and FePt [37][38][39] , and coupled MOS such as Fe 2 O 3 -CeO 2 [40][41][42][43] , SiO 2 -TiO 2 [44] , Ce-doped Al 2 O 3 [45,46] , Fe-doped Al 2 O 3 [47][48][49]…”