Micro-Raman and photoluminescence study of urchin-like ZnO structure assembled with nanorods synthesized by hydrothermal method

Abstract

Urchin-like ZnO structures assembled with nanorods have been synthesized by cetyltrimethylammonium bromide-assisted hydrothermal method. The as-obtained products were characterized by powder X-ray diffraction, field-emission scanning electron microscopy for the study of crystal structure and morphology. The ZnO urchin is constructed of well-assembled nanorods of length *3 lm range and diameter *20 nm. Micro-Raman study shows characteristic Raman-active mode of hexagonal ZnO at 439 cm -1 and also mode related to defects at *581 cm -1 . The ZnO urchin assembled with nanorods possessed band edge emission at 3.085 eV and defect related visible emission at 2.97, 2.57, and 2.36 eV.

Synthesis, growth mechanism, optical properties and catalytic activity of ZnO microcrystals obtained via hydrothermal processing

“…Therefore, each one is divided into longitudinal (LO) and 3. 5,11,16,26,[63][64][65][66][67][68][69][70][71][72][73] The modes present in the Raman spectra of the ZnO samples investigated in this study were attributed to the wurtzite crystal structure. The intense E 2 (low) band, approaching 100 cm À1 , is attributed to the vibrations of the Zn sublattice in the ZnO structure.…”

Controlled growth of flower-like, rod-like, and snowflake-like ZnO nanostructures using agarose as biotemplate and its photoluminescence property

“…The UV emission is due to band-edge emission and the visible emission is due to different intrinsic defects such as oxygen vacancies (V o ), zinc vacancies (V zn ), oxygen interstitials (O i ), zinc interstitials (Zn i ), and oxygen antisites (O zn ) [17][18][19]. Figure 5 shows the photoluminescence spectrum of ZnO nanorods synthesized by sonochemical method.…”

Nanostructures with Animal-like Shapes

“…86 The ZnO urchin was constructed of well-assembled nanorods of length ∼3 µm and diameter ∼20 nm. 87 An urchinlike Zn/ZnO core-shell structure, composed of a micrometer-scale sphere-shaped metallic-Zn core and a shell made of numerous radially protruding singlecrystalline ZnO nanorods, was synthesized and deposited directly on an indium-tin oxide (ITO) glass substrate by using a thermal evaporation method. 88 In this hybrid composite, the Zn-core made direct contact with the ITO layer, which enhanced the interface bonding and conductance between the Zn/ZnO structure and the substrate.…”

“…In contrast, sea urchin-like ZnO nanomaterials were also prepared by decomposition of zinc acetate precursor in the presence of sodium hydroxide and ethylene glycol in an ethanol solution using a solvothermal method at 180 °C for 12 h or, alternatively, on Si(100) by simple oxidation of ZnO films consisting of ZnO nanorods at 600 °C . The ZnO urchin was constructed of well-assembled nanorods of length ∼3 μm and diameter ∼20 nm . An urchinlike Zn/ZnO core−shell structure, composed of a micrometer-scale sphere-shaped metallic-Zn core and a shell made of numerous radially protruding single-crystalline ZnO nanorods, was synthesized and deposited directly on an indium−tin oxide (ITO) glass substrate by using a thermal evaporation method .…”