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ZnO micro and nanocrystals with enhanced visible light absorption

Authorized Users Only
2012
Authors
Stanković, Ana
Stojanović, Zoran S.
Veselinović, Ljiljana
Škapin, Srečo Davor
Bračko, Ines
Marković, Smilja
Uskoković, Dragan
Article (Published version)
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Abstract
In this paper, we investigate the effect of the particle size and morphology on the optical properties of ZnO. A series of ZnO micro and nanocrystals were synthesized by the hydrothermal processing of zinc acetate dihydrate and sodium hydroxide as the starting materials, and polyvinylpyrrolidone (PVP) as the polymer surfactant. The particle size and morphology were tailored by adjusting the reactant molar ratios [Zn2+]/[OH−], while the reaction temperature and the time remained unchanged. X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and high-resolution TEM (HRTEM) have shown that the micro and nanocrystals have a high crystalline pure wurtzite-type hexagonal structure with nanosized crystallites. The size and morphology of the ZnO micro and nanocrystals were investigated by field emission scanning electron microscopy (FE-SEM), which showed a modification from micro-rods via hexagonal-faceted prismatic morphology to nanospher...es, caused by simple adjustment of the reactant molar ratio [Zn2+]/[OH−] from 1:1 to 1:5. The optical properties of the ZnO micro and nanocrystals, as well as their dependence on the particle size and morphology were investigated by Raman and ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy (DRS). The UV–vis spectra showed that the modification of the particle size and morphology from nanospheres to micro-rods resulted in increased absorption, and a slight red-shift of the absorption edge (0.06 eV). Besides, the band gap energy of the synthesized ZnO micro and nanocrystals showed the red shift (∼0.20 eV) compared to bulk ZnO. According to the results of a Raman spectroscopy, the enhanced visible light absorption of the ZnO micro and nanocrystals is related to two phenomena: (1) the existence of lattice defects (oxygen vacancies and zinc interstitials), and (2) the particle surface sensitization by PVP.

Keywords:
zinc oxide / hydrothermal synthesis / morphology / optical properties
Source:
Materials Science and Engineering: B, 2012, 1038-1045
Publisher:
  • Elsevier
Funding / projects:
  • Molecular designing of nanoparticles with controlled morphological and physicochemical characteristics and functional materials based on them (RS-45004)

DOI: 10.1016/j.mseb.2012.05.013

ISSN: 0921-5107

WoS: 000309313000005

Scopus: 2-s2.0-84863989861
[ Google Scholar ]
21
21
Handle
https://hdl.handle.net/21.15107/rcub_dais_486
URI
https://dais.sanu.ac.rs/123456789/486
Collections
  • ИТН САНУ - Општа колекција / ITS SASA - General collection
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
TY  - JOUR
AU  - Stanković, Ana
AU  - Stojanović, Zoran S.
AU  - Veselinović, Ljiljana
AU  - Škapin, Srečo Davor
AU  - Bračko, Ines
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/486
AB  - In this paper, we investigate the effect of the particle size and morphology on the optical properties of ZnO. A series of ZnO micro and nanocrystals were synthesized by the hydrothermal processing of zinc acetate dihydrate and sodium hydroxide as the starting materials, and polyvinylpyrrolidone (PVP) as the polymer surfactant. The particle size and morphology were tailored by adjusting the reactant molar ratios [Zn2+]/[OH−], while the reaction temperature and the time remained unchanged. X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and high-resolution TEM (HRTEM) have shown that the micro and nanocrystals have a high crystalline pure wurtzite-type hexagonal structure with nanosized crystallites. The size and morphology of the ZnO micro and nanocrystals were investigated by field emission scanning electron microscopy (FE-SEM), which showed a modification from micro-rods via hexagonal-faceted prismatic morphology to nanospheres, caused by simple adjustment of the reactant molar ratio [Zn2+]/[OH−] from 1:1 to 1:5. The optical properties of the ZnO micro and nanocrystals, as well as their dependence on the particle size and morphology were investigated by Raman and ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy (DRS). The UV–vis spectra showed that the modification of the particle size and morphology from nanospheres to micro-rods resulted in increased absorption, and a slight red-shift of the absorption edge (0.06 eV). Besides, the band gap energy of the synthesized ZnO micro and nanocrystals showed the red shift (∼0.20 eV) compared to bulk ZnO. According to the results of a Raman spectroscopy, the enhanced visible light absorption of the ZnO micro and nanocrystals is related to two phenomena: (1) the existence of lattice defects (oxygen vacancies and zinc interstitials), and (2) the particle surface sensitization by PVP.
PB  - Elsevier
T2  - Materials Science and Engineering: B
T1  - ZnO micro and nanocrystals with enhanced visible light absorption
SP  - 1038
EP  - 1045
DO  - 10.1016/j.mseb.2012.05.013
UR  - https://hdl.handle.net/21.15107/rcub_dais_486
ER  - 
@article{
author = "Stanković, Ana and Stojanović, Zoran S. and Veselinović, Ljiljana and Škapin, Srečo Davor and Bračko, Ines and Marković, Smilja and Uskoković, Dragan",
year = "2012",
abstract = "In this paper, we investigate the effect of the particle size and morphology on the optical properties of ZnO. A series of ZnO micro and nanocrystals were synthesized by the hydrothermal processing of zinc acetate dihydrate and sodium hydroxide as the starting materials, and polyvinylpyrrolidone (PVP) as the polymer surfactant. The particle size and morphology were tailored by adjusting the reactant molar ratios [Zn2+]/[OH−], while the reaction temperature and the time remained unchanged. X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and high-resolution TEM (HRTEM) have shown that the micro and nanocrystals have a high crystalline pure wurtzite-type hexagonal structure with nanosized crystallites. The size and morphology of the ZnO micro and nanocrystals were investigated by field emission scanning electron microscopy (FE-SEM), which showed a modification from micro-rods via hexagonal-faceted prismatic morphology to nanospheres, caused by simple adjustment of the reactant molar ratio [Zn2+]/[OH−] from 1:1 to 1:5. The optical properties of the ZnO micro and nanocrystals, as well as their dependence on the particle size and morphology were investigated by Raman and ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy (DRS). The UV–vis spectra showed that the modification of the particle size and morphology from nanospheres to micro-rods resulted in increased absorption, and a slight red-shift of the absorption edge (0.06 eV). Besides, the band gap energy of the synthesized ZnO micro and nanocrystals showed the red shift (∼0.20 eV) compared to bulk ZnO. According to the results of a Raman spectroscopy, the enhanced visible light absorption of the ZnO micro and nanocrystals is related to two phenomena: (1) the existence of lattice defects (oxygen vacancies and zinc interstitials), and (2) the particle surface sensitization by PVP.",
publisher = "Elsevier",
journal = "Materials Science and Engineering: B",
title = "ZnO micro and nanocrystals with enhanced visible light absorption",
pages = "1038-1045",
doi = "10.1016/j.mseb.2012.05.013",
url = "https://hdl.handle.net/21.15107/rcub_dais_486"
}
Stanković, A., Stojanović, Z. S., Veselinović, L., Škapin, S. D., Bračko, I., Marković, S.,& Uskoković, D.. (2012). ZnO micro and nanocrystals with enhanced visible light absorption. in Materials Science and Engineering: B
Elsevier., 1038-1045.
https://doi.org/10.1016/j.mseb.2012.05.013
https://hdl.handle.net/21.15107/rcub_dais_486
Stanković A, Stojanović ZS, Veselinović L, Škapin SD, Bračko I, Marković S, Uskoković D. ZnO micro and nanocrystals with enhanced visible light absorption. in Materials Science and Engineering: B. 2012;:1038-1045.
doi:10.1016/j.mseb.2012.05.013
https://hdl.handle.net/21.15107/rcub_dais_486 .
Stanković, Ana, Stojanović, Zoran S., Veselinović, Ljiljana, Škapin, Srečo Davor, Bračko, Ines, Marković, Smilja, Uskoković, Dragan, "ZnO micro and nanocrystals with enhanced visible light absorption" in Materials Science and Engineering: B (2012):1038-1045,
https://doi.org/10.1016/j.mseb.2012.05.013 .,
https://hdl.handle.net/21.15107/rcub_dais_486 .

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