Carbon doped ZnO: Synthesis, characterization and interpretation

Mishra, Dilip Kumar; Mohapatra, Jyoshnarani; Sharma, Manoj Kumar; Chattarjee, R.; Singh, Saroj Kumar; Varma, Shikha; Behera, S. N.; Nayak, Sanjeev K.; Entel, P.

doi:10.1016/j.jmmm.2012.09.058

Cited by 144 publications

(63 citation statements)

References 46 publications

(49 reference statements)

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“…In pure ZnO, the large peak at 529.7 eV is assigned to O 2− ions in the Zn-O bonds of wurtzite ZnO crystals, and another peak at 531.1 eV is due to chemically adsorbed surface oxygen species, such as OH − and carbonates (Figure 7a). 23 The XPS spectra of carbon-doped ZnO (80ZA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 These results reveal that carbon-doped ZnO was successfully synthesized in 90ZA, 80ZA, 70ZA, and 60ZA and that ZnO/g-C 3 N 4 composites were fabricated on 50ZA. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 …”

Section: Characterization and Properties Of Carbon-doped Zno The Carmentioning

confidence: 99%

Carbon-Doped ZnO Nanostructures: Facile Synthesis and Visible Light Photocatalytic Applications

et al. 2015

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Zinc oxide (ZnO) has been widely used as a photocatalyst for solar energy conversion and treatment of organic pollutants because of its low toxicity and high photocatalytic efficiency. However, the applicability of ZnO in visible light is limited because of the wide band gap of the material, which results in low efficiency during solar photoconversion. In this paper, we report the facile one-pot, morphology-controlled, and large-scale synthesis of carbon-doped ZnO through urea-assisted thermal decomposition of zinc acetate. Nanorods and nanospheres of carbon-doped ZnO were successfully prepared by using this one-step method with various weight percent of urea. The photocatalytic activities of nanocrystals obtained with different morphologies and carbon contents were evaluated through degradation of methylene blue with visible light irradiation. Results showed that incorporation of carbon decreases the energy band gap of ZnO, improves the separation efficiency of its electron-hole pairs, and significantly enhances the visible light photocatalytic activity.

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Section: Characterization and Properties Of Carbon-doped Zno The Carmentioning

confidence: 99%

Carbon-Doped ZnO Nanostructures: Facile Synthesis and Visible Light Photocatalytic Applications

et al. 2015

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“…4(b) presents the O1s XPS of pure and C-doped ZnO calcined at 500 C. For pure ZnO, a large O1s locates at 529.8 eV is due to Zn-O bonds in wurtzite ZnO crystal, and a shoulder peak (531.3 eV) of 25% height to the major peak may be due to surface chemical adsorbed oxygen species, such as OH À group and carbonates. 22 The O1s XPS of C-doped ZnO encompasses a major peak at 529.7 eV along with a shoulder peak (531.5 eV) of 33% intensity to the major peak, suggesting the O1s components locates in different environment from those in ZnO. O1s XPS of C-doped ZnO were tted into 3 peaks centring at 531.5, 529.9 and 529.7 eV.…”

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confidence: 94%

Visible-light photocatalysis on C-doped ZnO derived from polymer-assisted pyrolysis

et al. 2015

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C-doped ZnO with a large surface area was prepared via F127-assisted pyrolysis at 500 C and used for visible-light-responsive photocatalytic water purification. The band structure of the C-doped ZnO was investigated using valance band XPS and DFT simulation. The C-doped ZnO possessed enhanced absorption of UV and visible light, though it showed lower visible-light-responsive photocatalytic activity than ZnO because of significant recombination of photogenerated charge carriers arising from overloaded C-dopant and oxygen vacancies.

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“…All carbon in the aggregates is bound and these Zn-O-C aggregates can be considered as C-doped ZnO. As follows from first-principle calculations [41,42] and examination of electrophysical properties [68], carbon is preferably localized in the Zn sublattice. TEM data for quasi-one-dimensional C-doped ZnO agree completely with the results of Raman spectroscopy.…”

Section: Morphology and Microstructure Of Zno And Zn-o-c Aggregates mentioning

confidence: 99%

“…An additional red shift to the low-energy region can emerge owing to energy levels of dissolved carbon in the band gap. These energy levels, as evidenced by the first-principle calculations, arise for carbon-doped zinc oxide [40][41][42]. (1) and then annealed at 400…”

Section: Optical Properties Of Zno Zno:nc Composites and C-doped Znomentioning

confidence: 99%

“…The reduction of the optical gap is associated with the optical absorption properties of the ZnO/graphene composite. However, ab-initio electron structure calculations show that restructuring of the electron-energy spectrum and optical-gap narrowing can take place owing to carbon doping of ZnO [40][41][42]. So, synthesis and comparative research of structural and optical properties of ZnO:nC composites and C-doped ZnO phases in nanostructured state is of much interest for catalytic applications.…”

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Structural, Optical, and Photocatalytic Properties of Quasi-One-Dimensional Nanocrystalline ZnO, ZnOC:nC Composites, and C-doped ZnO

Шалаева

Гырдасова

Красильников

et al. 2014

Springer Proceedings in Physics

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Zinc oxide with a wurtzite structure belongs to a group of advanced functional materials because it possesses a unique set of properties. Its most important property is high photocatalytic activity in low-temperature oxidation reactions of toxic and colored organic compounds dissolved in water [1][2][3][4][5][6]. The action of oxide semiconductor photocatalysts is based on the generation of free carriers (electrons and holes) under exciting radiation, which take part in redox reactions on the oxide surface [7]. The photocatalytic activity can be increased first of all by creating a high specific surface area and a high concentration of native structural defects, which raises the specific concentration of sorption and oxidation centers on the catalyst surface [8][9][10]. There are numerous original researches and reviews devoted to various synthesis methods of nanosized ZnO materials having a high specific surface area [11][12][13][14][15][16][17]. Another way for improving the photocatalytic properties of wide-bandgap semiconductors is modification of the electron-energy spectrum of oxides. The results of first-principle quantum chemical calculations show that restructuring of the electron-energy spectrum and reduction of the optical gap can occur owing to native structural defects such as oxygen vacancies of . The effects of electron-energy-spectrum restructuring and photocatalytic activity enhancement induced by oxygen vacancies have been confirmed experimentally for nanostructured ZnO [20]. Reduction of recombination processes of generated electron-hole pairs also increases the photocatalytic activity [7]. The combination of the above methods for improving the photocatalytic activity seems promising for the development of ZnO-based photocatalysts. Nobel metal/ZnO nanocomposites exhibit very high cat-E. V. Shalaeva ( ) · O. I. Gyrdasova · V. N. Krasilnikov · M. A. Melkozerova · I.

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Carbon doped ZnO: Synthesis, characterization and interpretation

Cited by 144 publications

References 46 publications

Carbon-Doped ZnO Nanostructures: Facile Synthesis and Visible Light Photocatalytic Applications

Carbon-Doped ZnO Nanostructures: Facile Synthesis and Visible Light Photocatalytic Applications

Visible-light photocatalysis on C-doped ZnO derived from polymer-assisted pyrolysis

Structural, Optical, and Photocatalytic Properties of Quasi-One-Dimensional Nanocrystalline ZnO, ZnOC:nC Composites, and C-doped ZnO

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