Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing

Mahmoud, Anis; Echabaane, M.; Omri, K.; Boudon, Julien; Saviot, Lucien; Millot, Nadine; Chaâbane, Rafik Ben

doi:10.3390/molecules26040929

Cited by 41 publications

(23 citation statements)

References 82 publications

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“…Increasing the dopant concentration showed decreasing intensity and increasing FWHM values, which corroborates the reduction of both the crystallite size and crystallinity of the composite. Similarly, the observed shift in the peak position toward a higher 2 θ value, decreasing peak intensity, and peak broadening were also reported in various works 69–73 and explained to be due to the contraction of the c lattice due to the doping of Cu atoms into the ZnO lattice. No impurity peak conforming to copper was found, which indicates the absence of structural distortion in the ZnO lattice, although the XRD technique is not sensitive to small doped particles.…”

Section: Dopant–host Reactivity Balancessupporting

confidence: 83%

Insights into ZnO-based doped porous nanocrystal frameworks

Abebe

Murthy

2022

RSC Adv.

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Section: Dopant–host Reactivity Balancessupporting

confidence: 83%

Insights into ZnO-based doped porous nanocrystal frameworks

Abebe

Murthy

2022

RSC Adv.

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“…10 The development of an independent CuO phase above the optimum dopant percentage (solubility level) was also reported in recent works. 18,25,27 Mahmoud et al synthesized the Cu-doped ZnO NCs by the sol−gel process. The copper doping up to 4% showed a highangle peak shift due to substitutional copper doping, with no independent peak for the copper metal or copper oxide.…”

Section: Resultsmentioning

confidence: 99%

“…However, increasing the copper percentage to 5% resulted in the appearance of an independent copper oxide peak. 27 Morales-Mendoza et al synthesized Cu-doped ZnO/CuO NCs with flake-type morphology. The occurrence of an independent monoclinic CuO phase above 6% resulted in the appearance of an independent copper oxide peak and enhancements in the visible-light absorption range caused by ZnO-CuO heterojunction.…”

Section: Resultsmentioning

confidence: 99%

Cu/CuO-Doped ZnO Nanocomposites via Solution Combustion Synthesis for Catalytic 4-Nitrophenol Reduction

et al. 2023

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The synthesis of optoelectrically enhanced nanomaterials should be continuously improved by employing timeand energy-saving techniques. The porous zinc oxide (ZnO) and copper-doped ZnO nanocomposites (NCs) were synthesized by the time-and energy-efficient solution combustion synthesis (SCS) approach. In this SCS approach, once the precursor− surfactant complex ignition point is reached, the reaction starts and ends within a short time without the need for any external energy. The TGA−DTA analysis confirmed that 500 °C was the point at which stable metal oxide was obtained. The doping and heterojunction strategy improved the optoelectric properties of the NCs more than the individual constituents, which then enhanced the materials' charge transfer and optical absorption capabilities. The porosity, nanoscale crystallite size (15−50 nm), and formation of Cu/CuO-ZnO NCs materials were confirmed from the XRD, SEM, and TEM/HRTEM analyses. The obtained d-spacing values of 0.275 and 0.234 nm confirm the formation of ZnO and CuO crystals, respectively. The decrease in photoluminescence intensity for the doped NCs corroborates a reduction in electron−hole recombination. On the Mott−Schottky analysis, the positive slope for ZnO confirms the n-type character, while the negative and positive slopes of the NCs confirm the p-and n-type characters, respectively. A diffusion-controlled type of charge transfer process on the electrode surface was confirmed from the cyclic voltammetric analysis. Thus, the overall analysis shows the applicability of the less expensive and more efficient SCS for several applications, such as catalysis and sensors. To confirm this, an organic catalytic reduction reaction of 4-nitrophenol to 4-aminophenol was tested. Within three and a half minutes, the catalytic reduction result showed the great potential of NCs over ZnO NPs. Thus, the energy-and time-saving SCS approach has a great future outlook as an industrial pollutant catalytic reduction application.

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“…The crystallite size and strains were calculated using the Halder & Wagner (H-W) method (Eq. 2) [40], [41]. This method considers both the size and strain effects on the XRD peak broadening and is relevant in case of Gaussian and Voigt profiles.…”

Section: Methodsmentioning

confidence: 99%