Structural and Optical Behavior of CuO/Ag and CuO/Ag/Au Nanocatalysts Synthesized Via a Novel Two Step Synthesis Approach for Enhancement of Catalytic Activity

Sankaran, A.; Kumaraguru, K.; Balraj, B.

doi:10.1007/s10904-020-01655-x

Cited by 17 publications

(3 citation statements)

References 27 publications

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“…For single metal materials, F-Ag>Au>B-Cu, the main reason is that Ag has higher, the superior surface plasmon resonance effect than Au and Cu. Meanwhile, the Raman effect of F-Ag is higher than that of B-Cu@Au, further indicating that F-Ag plays a dominant role in this work [33]. As expected, the Raman signal peak corresponding to the three-metal hybrid system B-Cu@F-Ag@Au substrate is the strongest.…”

Section: Structural and Morphological Analysissupporting

confidence: 65%

Functionalised B‐Cu@F‐Ag@Au trimetallic nanomaterials with long term stability for rapid and highly sensitive in situ SERS detection of furfural in transformer oil

et al. 2022

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The surface-enhanced Raman scattering (SERS) substrates enable a highly sensitive detection of furfural in the transformer oil. However, detection substrates with long-term stability are still extremely challenging. In this work, we anchored the thiol-containing coupling agents 2, 5-dimercapto-1, 3, 4-thiadiazole (DMTD) and 1, 4-benzenedithiol (BDT) on the surface of bubble copper (B-Cu) and flower-like silver nanoparticles (F-Ag), respectively. The three-dimensional SERS detection substrates with long-term stability by using a combination of chemical reduction and self-assembly methods were constructed. The substrate has a minimum detection limit of 10 −9 M for rhodamine B in oil with an enhancement factor of up to 2.23 � 10 7 . Importantly, the three-crystal B-Cu@F-Ag 1 @Au 5 substrate was used for the detection of furfural in the transformer oil with a detection limit of 2 mg/L and a relative standard deviation value of 2.46%. After 60 days of a simulated operation, the detection signal of furfural in the transformer oil samples at 75°C and still reached the initial value of 77.53%, indicating that the substrate has a good long-term stability. This triple frame structured SERS detection platform shows great potential in tracking furfural in the aging transformer oil mixing systems. | INTRODUCTIONPower transformers are the core equipment in the power transmission systems. During the actual operation of a transformer, its oil-paper insulation system is subjected to electrical, thermal and mechanical stress, and it produces aging characteristics [1][2][3][4]. As a typical aging characteristic, furfural can be used to accurately evaluate the aging degree of the transformer insulation system [5,6]. Chromatographic based spectrophotometry and high-performance liquid chromatography are routine detection methods for furfural in the transformer oil. These methods are expensive, and they are easily affected by the surrounding environmental factors and cannot complete the detection of a complex oil system [7,8]. To achieve a nondestructive and in situ detection of furfural dissolved in oil, Toshihiro et al. applied laser Raman spectroscopy to detect the standard sample of furfural in the transformer oil for the first time, and the minimum detection limit could reach only 104 mg/L [9], which cannot meet the furfural detection accuracy standard (4 mg/L) of the transformer oil after severe aging.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Structural and Morphological Analysissupporting

confidence: 65%

Functionalised B‐Cu@F‐Ag@Au trimetallic nanomaterials with long term stability for rapid and highly sensitive in situ SERS detection of furfural in transformer oil

et al. 2022

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“…Nowadays, CuO is used as photocatalyst, antioxidant, drug delivery agent, and imaging mediator in the field of biomedicine [15]. Furthermore, in industrial fields, CuO is extensively used as a p-type semiconductor in photocatalysis, batteries, solar cells, gas sensors, and field emitters [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Mo-Doped CuO Nanomaterial for Photocatalytic Degradation of Water Pollutants under Visible Light

et al. 2021

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Recently, metal oxide-based nano-photocatalysts have gained a great deal of attention in waste water remediation due to their outstanding properties. In this report, a novel Mo-doped CuO nanomaterial was successfully prepared and utilized for the degradation of methylene blue water pollutant. The molybdenum content was varied from 1–5 wt.% to obtain the desired modified CuO based nanomaterials. The crystalline structures of as prepared materials were investigated using the XRD technique, which explored the successful fabrication of monoclinic-structure-based CuO nanomaterials. For morphological studies, SEM and HRTEM were used, which proved the successful preparation of nanoparticles-based material. SAED was used to check the crystallinity of the sample. EDX and XPS analyses were performed to evaluate the elemental composition of Mo-doped CuO nanomaterials. The optical characteristics were explored via UV-vis and PL techniques. These studies showed that the energy bandgap of CuO decreased from 1.55 eV to 1.25 eV due to Mo doping. The photocatalytic efficiency of Mo-doped CuO nanomaterials was evaluated by degrading methylene blue (MB) under visible light-irradiation. Among different Mo-doped CuO based nanomaterials, the 4 wt.% Mo-doped CuO sample showed the highest degradation activity against MB dye. These results verified that the optimized material can be used for photocatalytic applications, especially for the purification of waste water.

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“…In the lack of the catalyst, the dyes degraded to a lesser extent in the occurrence of NaBH 4 , indicating that while reduction took place; it did so at a slow rate. The mechanisms of MG, MO, and MB degradation using NaBH 4 in the occurrence of nZVI as a catalyst are discussed in FiguresS4-S6 [43][44][45][46][47]. Figures 9(A), 9(B), 11(A), 11(B), 13(A), and 13(B) depict the percentages of dye degradation with the synthesized nZVI.…”

mentioning

confidence: 99%

Biosynthesis of zerovalent iron nanoparticles for catalytic reduction of 4‐nitrophenol and decoloration of textile dyes

Raiza

Pandian

Gopinath

2022

Biotech and App Biochem

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We demonstrate a green chemistry approach to synthesize narrow-sized zerovalent iron (nZVI) nanoparticles using Artocarpus heterophyllus Lam. leaf extract as reducing and capping agent. The produced nZVI was characterized by various instrumental methods including ultraviolet-visible spectra, transmission electron microscopy, vibrating sample magnetometer (VSM), X-ray diffraction, and Fourier transform infrared spectroscopy. Based on the electron microscopy observations, the particle size was estimated to be ∼30 nm. In VSM, the saturation point of magnetization was observed to be 0.6 emu g −1 under a magnetic field of 0 ± 30 kOe. The synthesized nZVI was amorphous in nature as per the XRD results. The catalytic activity of the nZVI was employed for the catalytic reduction of 4-nitrophenol (4-NP) and decoloration of textile dyes such as methylene blue, methyl orange, and malachite green, respectively. The proposed nZVI synthesis method exhibited better catalytic performance toward reduction of 4-NP and degradation of dyes within 4 min for 0.1 mg of catalyst. Moreover, the synthesized catalyst nZVI can be recoverable and reutilized in many cycles without loss of its significant catalytic activity. The synthesized nZVI could be a promising material to treat industrial wastewater via profitable, sustainable, and ecofriendly approaches.

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Structural and Optical Behavior of CuO/Ag and CuO/Ag/Au Nanocatalysts Synthesized Via a Novel Two Step Synthesis Approach for Enhancement of Catalytic Activity

Cited by 17 publications

References 27 publications

Functionalised B‐Cu@F‐Ag@Au trimetallic nanomaterials with long term stability for rapid and highly sensitive in situ SERS detection of furfural in transformer oil

Functionalised B‐Cu@F‐Ag@Au trimetallic nanomaterials with long term stability for rapid and highly sensitive in situ SERS detection of furfural in transformer oil

Mo-Doped CuO Nanomaterial for Photocatalytic Degradation of Water Pollutants under Visible Light

Biosynthesis of zerovalent iron nanoparticles for catalytic reduction of 4‐nitrophenol and decoloration of textile dyes

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