Influence of Cu + g-C3N4 incorporation on the photocatalytic dye decomposition of ZnO film coated on stainless steel wire meshes

Ravichandran, K.; Seelan, K. Shantha; Kavitha, P.; Sriram, S.

doi:10.1007/s10854-019-02321-w

Cited by 18 publications

(5 citation statements)

References 79 publications

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“…The adsorbed oxygen molecules can form three types of ions (O 2 − -below 100 °C (equation ( 6)), O − -between 100 to 300 °C and O 2− above 300 °C). Previous reports showed theformation of O 2 − ions on the film surface at room temperature [43]. In the present study, we believe that these oxygen ions form a depletion layer over the surface of ZnO:Y films and thus resulting in a high electrical resistance.…”

Section: Sensing Mechanismsupporting

confidence: 61%

“…Figure 5 shows the PL spectra and its Lorentz fitting of pure and yttrium doped ZnO films. The emission band observed at 384 nm is related to the transition between the CB and VB [43]. This peak is found to shift to lower wavelength side due to the influence of yttrium doping.…”

Section: Photoluminescence Studymentioning

confidence: 89%

“…The concentration of the ammonia vapor was calculated using the formula, [43] ( ) where δ is the density of gas (g mol −1 ), ν r represents the volume of the exposed gas, R denotes the universal gas constant (8.415 J mol −1 K −1 ), T indicates the absolute temperature (K), M represents the molecular weight (g mol −1 ), P b is the pressure of chamber and V b is the chamber volume in liters'.…”

Section: Sensing Characteristicsmentioning

confidence: 99%

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Enhanced ammonia sensing of ZnO thin films through Yttrium doping by cost-effective nebulizer spray pyrolysis method

Ravichandran¹,

Santhosam²,

Aldossary³

et al. 2021

Phys. Scr.

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Yttrium (Y) doped (doping concentration-0, 1, 3 and 5 wt%) ZnO thin films were deposited using spray pyrolysis technique. Structural, surface morphological, optical and compositional properties were analyzed using x-ray diffraction (XRD), Atomic Force Microscopy (AFM), UV-vis NIR spectrophotometry (UV), photoluminescence studies (PL) and elemental composition analysis. Ammonia vapour sensing properties such as response/recovery, stability and repeatability were studied at room temperature. XRD results confirmed that the prepared samples have hexagonal wurtzite structure. ZnO:Y thin film with 5 wt% yttrium doping exhibits excellent sensing response of 99, fast response/recovery times of 29 s/7 s which may be due to the existence of oxygen vacancies in ZnO:Y (5 wt%) film sample as confirmed by photoluminescence (PL) study. These oxygen vacancies attract more electrons and thus enhance the gas sensing. In addition, increase in number of active sites caused by substitution of Y 3+ (trivalent) ions into Zn 2+ (divalent) regular sites as confirmed by the observed M-B (Moss-Burstein) effect, also causes an enhancement in the gas sensing. Surface roughness, another reason for the enhanced sensitivity has been confirmed by AFM.

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Section: Sensing Mechanismsupporting

confidence: 61%

Section: Photoluminescence Studymentioning

confidence: 89%

Section: Sensing Characteristicsmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced ammonia sensing of ZnO thin films through Yttrium doping by cost-effective nebulizer spray pyrolysis method

Ravichandran¹,

Santhosam²,

Aldossary³

et al. 2021

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

show abstract

“…4 shows the PL spectra and its Lorentz fitting of pure and yttrium doped ZnO films. The emission band observed at 384 nm is related to the transition between the CB and VB [39]. This peak is found to shift to lower wavelength side due to the influence of yttrium doping.…”

Section: Photoluminescence Studymentioning

confidence: 89%

Enhanced Ammonia Sensing By Cost-Effective ZnO Thin Films Through Yttrium Doping

Ravichandran¹,

Aj²,

et al. 2021

Preprint

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Yttrium (Y) doped (doping concentration - 0, 1, 3 and 5 wt%) ZnO thin films were deposited using spray pyrolysis technique. The structural, surface morphological, optical and compositional properties were analysed using X-Ray diffraction (XRD), Atomic Force Microscopy (AFM), UV-vis NIR spectrophotmetry (UV), photoluminescence study (PL) and elemental composition analysis. Ammonia vapour sensing properties such as response/recovery, stability and repeatability were studied at room temperature. XRD results confirmed that the prepared samples have hexagonal wurtzite structure. ZnO:Y thin film with 5 wt% yttrium doping exhibits excellent sensing response of 99, fast response/recovery times of 29 s/ 7 s which may be due to the existence of oxygen vacancies in the case of ZnO:Y (5 wt%) film sample confirmed by photoluminescence (PL) study. These oxygen vacancies attract more electrons and thus enhance the gas sensing. In addition, increase in the number of active sites caused by the substitution of Y3+(trivalent) ions into the Zn2+ (divalent) regular sites as confirmed by the observed M-B (Moss-Burstein) effect also causes an enhancement in the gas sensing. Surface roughness, another reason for the enhanced sensitivity, has been confirmed by AFM.

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“…研究表明, 在 Cu 掺杂 ZnO 基础上继续复合二维材料, 如石墨烯(Gr) [28,[30][31][32][33][34][35] 和石墨型氮化碳(CN) [34][35][36][37][38][39][40] , 可进一步提高气体传感和光催化等性能. Jagtap 等 [34] 制备了掺杂 1%～7% Cu 的 ZnO 材料, 在 200 ℃对 1.88 mg/m³的 NO 2 气敏响应为 5, 进一步复合还原石墨烯氧化物, 其响应值为 6.79、且在 30 d 后仍能保持较好的稳定性.…”

Section: 引言unclassified

Density Functional Theory Study of Structures of Copper-doped and Graphitic Carbon Nitride-combined Zinc Oxides and Their Boosted Nitrogen Dioxide-sensing Performance

Wang,

Xiao,

Xie

et al. 2023

Acta Chimica Sinica

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Of numerous environmental problems, the air pollution caused by toxic nitrogen dioxide has become more and more serious. Its timing detection is of utmost importance but challenging. It is known that NO2 sensors fabricated by zinc oxide-derived materials suffer some issues. And thus synthetic strategies such as doping and combining have been developed to improve sensitive performance and modify operation condition. However, the relevant sensing reaction mechanism still remains unclear; moreover, the experimentally structural characterizations on sensitive materials (SMs) and reaction intermediates are rather difficult at the atomic level, which turn much worse for the doped and combined SMs. In the work, density functional theory calculations have been exploited to examine copper-doped zinc oxide (marked as ZOC) and its composites ZOC/CN and ZOC/Gr. CN and Gr are short for 2D materials, graphitic carbon nitride (g-C3N4) and graphene, respectively. The local structures have been accessible for these SMs and their intermediates along the reaction pathway. It is shown that ZOC bears the Cu-Zn heterobimetallic adsorption active sites, which hold NO2 via Cu/Zn-O dative bonds. The introduction of copper increases metal contribution to high-lying occupied molecular orbitals (MOs). Major NO2→ZOC donation and minor back-donation interactions have been recognized by charge decomposition analyses in terms of fragment MOs. Consequently, its adsorption free energy towards NO2 is strengthened by 0.27 eV relative to pristine ZnO. These well interpret the experimental findings that the copper-doped zinc oxide has much faster response time. Further combination with g-C3N4 enhances the NO2-sensing performance, which turns out to be the best SM candidate. Exemplarily, ZOC/CN shows the most negative NO2 adsorption energy (-0.31 eV), very small uphill energy for the rate-determining step (0.27 eV) and modest formation energy of nitrate (-1.06 eV). With these, the SM not only responses NO2 rapidly but also desorbs nitrate at mild

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Influence of Cu + g-C3N4 incorporation on the photocatalytic dye decomposition of ZnO film coated on stainless steel wire meshes

Cited by 18 publications

References 79 publications

Enhanced ammonia sensing of ZnO thin films through Yttrium doping by cost-effective nebulizer spray pyrolysis method

Enhanced ammonia sensing of ZnO thin films through Yttrium doping by cost-effective nebulizer spray pyrolysis method

Enhanced Ammonia Sensing By Cost-Effective ZnO Thin Films Through Yttrium Doping

Density Functional Theory Study of Structures of Copper-doped and Graphitic Carbon Nitride-combined Zinc Oxides and Their Boosted Nitrogen Dioxide-sensing Performance

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