A SILAR fabrication of nanostructured ZnO thin films and their characterizations for gas sensing applications: An effect of Ag concentration

Devi, K. Radhi; Selvan, G.; Karunakaran, M.; Kasirajan, K.; Shkir, Mohd.; AlFaify, S.

doi:10.1016/j.spmi.2020.106547

Cited by 22 publications

(10 citation statements)

References 51 publications

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“…From the results obtained at Table 1, the mean size of particles varies from 240.5 nm (Cu(OH) 2 −Cu 2 O@PpPD at E cste) to 40.9 nm (Cu(OH) 2 −Cu 2 O@PpPD at I cste) depending of the mode of the deposition used. It should be noted that an increase of value of dislocation density (0.173×10 14 lines/m 2 at Cu(OH) 2 −Cu 2 O@PpPD at E cste to 5.96×10 14 lines/m 2 at Cu(OH) 2 −Cu 2 O@PpPD at I cste) is observed which is attributed to the increased crystallographic imperfections and the enhancement in amounts of defects on electrode surface as reported by As reported by Pujar et al., and Devi et al during their studies [56,57] …”

Section: Resultssupporting

confidence: 54%

“…It should be noted that an increase of value of dislocation density (0.173×10 14 lines/m 2 at Cu(OH) 2 À Cu 2 O@PpPD at E cste to 5.96×10 14 lines/m 2 at Cu-(OH) 2 À Cu 2 O@PpPD at I cste) is observed which is attributed to the increased crystallographic imperfections and the enhancement in amounts of defects on electrode surface as reported by As reported by Pujar et al, and Devi et al during their studies. [56,57]…”

Section: Xrd Of Electrocatalystsmentioning

confidence: 99%

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New and Ultra‐Rapid Approach for Electrosynthesis of Highly Efficient Catalysts of Poly(para‐phenylenediamine) Supported Copper Oxide for Ethanol Oxidation in Alkaline Medium

El Attar,

Bouljoihel,

Ezzahi

et al. 2023

ChemElectroChem

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Herein, a new and simple strategy based on electrochemical cascade reactions was used to prepare copper/poly(para‐phenylenediamine). The catalysts were prepared by a facile one‐pot synthesis via an electrochemical method in a solution containing monomer and copper in a suitable concentration using potentiostatic or galvanostatic mode. Using galvanostatic mode leads to the formation of nanodendritic shape of copper hydroxide‐copper oxide in contrast with potentiostatic mode which leads to a spherical form. The response toward ethanol oxidation was greatly affected by the morphology of the obtained nanocomposite. Indeed, the current density obtained when using potentiostatic mode is about 26.55 mA cm−2 at 1.05 V vs Ag/AgCl. This performance is about 2.4 times higher than of the electrocatalyst prepared by galvanostatic mode (11.09 mA cm−2 at 0.85 V). The durability and long‐term stability of the obtained electrocatalysts were investigated using chronoamperometry and cyclic voltammetry. The decrease in current density is about 19 % and 49 % for electrocatalysts prepared by galvanostatic and potentiostatic mode respectively, after 700 scans. Finally, ex–situ FTIR spectroscopy was conducted in order to understand the reaction mechanism of ethanol oxidation in alkaline medium. It demonstrates that Cu(OH)2−Cu2O@PpPD can perform the complete oxidation of ethanol molecules, leading to the formation of CO2 molecule as the final product. This study highlighted a new simple and facile approach for synthesizing electrocatalysts based on Cu(OH)2−Cu2O@PpPD for alcohol oxidation applications.

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Section: Resultssupporting

confidence: 54%

Section: Xrd Of Electrocatalystsmentioning

confidence: 99%

New and Ultra‐Rapid Approach for Electrosynthesis of Highly Efficient Catalysts of Poly(para‐phenylenediamine) Supported Copper Oxide for Ethanol Oxidation in Alkaline Medium

El Attar,

Bouljoihel,

Ezzahi

et al. 2023

ChemElectroChem

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show abstract

“…Undoped and doped ZnO films can be prepared by different techniques like magnetron sputtering, hydrothermal, sol gel, wet chemical route, SILAR and nebulizer spray Pyrolysis method [24][25][26][27][28][29]. Among these methods, nebulizer spray pyrolysis offers many advantages: economic, simple and safe, facilitate large surface area coating, flexible process parameters and uniform thickness [30].…”

Section: Introductionmentioning

confidence: 99%

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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“…In this work, we have enhanced the gas sensing property of the ZnO thin films by doping with Y ions by reducing the grain size as well as creating the vacant sites due to size differences of Y 3+ and Zn 2+ ions. Undoped and doped ZnO films can be prepared by different techniques like magnetron sputtering, hydrothermal, sol-gel, wet chemical route, SILAR and nebulizer spray pyrolysis method [27][28][29][30][31][32]. Among these methods, nebulizer spray pyrolysis offers many advantages:economic, simple and safe, facilitate large surface area coating, flexible process parameters and uniform thickness [33].…”

Section: Introductionmentioning

confidence: 99%

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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A SILAR fabrication of nanostructured ZnO thin films and their characterizations for gas sensing applications: An effect of Ag concentration

Cited by 22 publications

References 51 publications

New and Ultra‐Rapid Approach for Electrosynthesis of Highly Efficient Catalysts of Poly(para‐phenylenediamine) Supported Copper Oxide for Ethanol Oxidation in Alkaline Medium

New and Ultra‐Rapid Approach for Electrosynthesis of Highly Efficient Catalysts of Poly(para‐phenylenediamine) Supported Copper Oxide for Ethanol Oxidation in Alkaline Medium

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

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

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