Investigation of nitrogen doped ZnO thin films: Effects on their structural and optical properties

Hopoğlu, Hicret; Aydınoğlu, Hafize Seda; Özer, Ali; Tüzemen, Ebru Şenadım

doi:10.1016/j.optmat.2021.111685

Cited by 11 publications

(4 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The stretching frequency of the Zn‐O bond in zinc oxide is responsible for the absorption peaks below 1,000 cm −1 59,60 . The broadening of the ZnO feature was attributed to the substitution of oxygen with sulfur ions 61,62 . The FTIR spectra showed that phenolic compounds and protein molecules in the Cystoseira crinite extract play an important role in capping and stabilization of the biosynthesized S‐doped ZnO as reported in references 33, 63 …”

Section: Resultsmentioning

confidence: 83%

Photodegradation of cationic and anionic dyes by ZnO and S/ZnO biosynthesized nano‐photocatalysts

Hassan,

Farag,

El‐Dafrawy

2024

Applied Organom Chemis

View full text Add to dashboard Cite

Photocatalysis is considered a promising and efficient oxidation technique for wastewater treatment. Developing more environmentally biocompatible, simple, effective, and inexpensive photocatalysts enables photocatalysis technology to be at the forefront of wastewater treatments. As an alternative to harmful chemicals, this work focused on the biosynthesis of a variety of ZnO and doped ZnO based on the extract of the brown alga Cystoseira crinite. X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDX), Fourier transform‐infrared (FTIR) spectroscopy, and ultraviolet–visible (UV–vis) spectroscopy were used to characterize the structure, phase, morphology, and UV–vis properties of the biosynthesized samples. XRD showed the crystalline structure of ZnO and S‐doped ZnO. SEM analysis revealed agglomerated spherical particles of the prepared samples. EDX analysis confirmed the formation of S‐doped ZnO. FTIR spectra exhibited that phenolic compounds and protein molecules are present in the Cystoseira crinite extract. The photocatalytic efficiency of biosynthesized materials was examined by monitoring the degradation of crystal violet (CV) and methyl orange (MO) dyes, which serve as cationic and anionic dye models, respectively. The various factors that influence the efficacy of the photodegradation process were investigated. In total, 5% S‐doped ZnO decomposed 97.40% and 89.18% of CV and MO dyes, respectively. The dye degradation was most efficient in samples calcined at 500 °C. The photodegradation of CV dye was enhanced at high pH, while the highest photocatalytic activity of MO dye was observed at low pH values. The kinetic study confirmed that the photodegradation follows the first‐order reaction.

show abstract

Section: Resultsmentioning

confidence: 83%

Photodegradation of cationic and anionic dyes by ZnO and S/ZnO biosynthesized nano‐photocatalysts

Hassan,

Farag,

El‐Dafrawy

2024

Applied Organom Chemis

View full text Add to dashboard Cite

show abstract

“…[24][25][26][27][28] Nitrogen incorporation in ZnO reduces the optical band gap and improves absorption in the solar spectrum for better PEC efficiency. [29][30][31][32][33][34][35][36][37] However, the effect of pH on electrolytes and their effect on PEC activity have not been reported. Acidic electrolytes increase corrosion, while KOH and NaOH are basic electrolytes that provide a stable medium for metal oxides in PEC water splitting towards solar hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

The impact of electrolytic pH on photoelectrochemical water oxidation

et al. 2023

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…Other than S-doped g-C 3 N 4 , there are other systems that show both an increase and decrease in the band gap by doping with the same elements. Some examples are manganese-doped SnO 2 , 78,79 nitrogen-doped ZnO, 80,81 and copper-doped TiO 2 . 82,83 In addition, dual doping of graphitic carbon nitride with two types of non-metallic atoms has a great enhancement and more positive effect on physicochemical properties than single element doping.…”

Section: Introductionmentioning

confidence: 99%

Orbital Understanding to the Origin of Site-Specific Band Gap Tuning in Electron-Rich S-Doped and Electron Precise C,S-Dual-Doped Graphitic Carbon Nitride

George

2023

J. Phys. Chem. C

View full text Add to dashboard Cite

Elemental doping engineering has proven to be a powerful method for tailoring the physical and chemical properties of two-dimensional materials. However, we still lack an understanding of how to control it for our desired purpose. Graphitic carbon nitride (g-CN) is an exciting material that has received much attention for enhanced optical and photo-physical properties due to elemental doping. Sulfur-doped g-S-CN is an interesting example of elemental doping that exhibits both enlarged and narrowed band gaps. Hence, it is necessary to understand the electronic origin of band gap variation with respect to the structure of the doped material. Herein, we aim to provide a systematic theoretical understanding of the enhanced optical properties of electron-rich sulfur-doped g-S-CN and the electron-precise carbon sulfur dual-doped g-CS-CN. In our theoretical investigation, we have successfully shown that a mere change of dopant site alters the electronic structure owing to the geometrical changes at the atomic level in order to maintain proper π-electron delocalization in the system. The prominent effect observed in the replacement of di-coordinated aromatic N-atom by the C-atom is the destabilization of the σ-valence band, while the substitution of tri-coordinated terminal and central N-atom by C-atom destabilizes the π-conduction band as compared to g-S-CN. Considering the suitable position of the bands, band gap, and low substitution energy, the dual-doped pristine g-CN (band gap = 2.80 eV) formed by the substitution of aromatic N-atom with S-atom and terminal/central N-atom with C-atom leads to rather stable systems with ΔE sub(g‑CS‑CNx) of 0.68 and 0.90 eV, as well as higher photocatalytic reactivity, where the former shows a redshift (2.37 eV) and the latter shows a blueshift (3.09 eV) within the visible region. Thus, promising theoretical understanding about the tuning of band edge levels of these novel C,S-dual doped g-CN can attract more experiments for potential applications to be developed, especially for photocatalysis.

show abstract

Investigation of nitrogen doped ZnO thin films: Effects on their structural and optical properties

Cited by 11 publications

References 47 publications

Photodegradation of cationic and anionic dyes by ZnO and S/ZnO biosynthesized nano‐photocatalysts

Photodegradation of cationic and anionic dyes by ZnO and S/ZnO biosynthesized nano‐photocatalysts

The impact of electrolytic pH on photoelectrochemical water oxidation

Orbital Understanding to the Origin of Site-Specific Band Gap Tuning in Electron-Rich S-Doped and Electron Precise C,S-Dual-Doped Graphitic Carbon Nitride

Contact Info

Product

Resources

About