Surface plasmon resonance effect on charge transfer in Ag@Cu2O-rGO composites

Di, Shuhan; Guo, Shuang; Wang, Yiting; Wang, Wei; Jung, Young Mee; Zhong, Hua; Wang, Li

doi:10.1016/j.matchemphys.2023.127621

Cited by 8 publications

(4 citation statements)

References 45 publications

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“…As a comparison, both peak positions symbolizing Cu + in Cu 2 O@rGO redshifted, which indicates that there is an interaction between rGO and Cu 2 O [ 40 ]. Based on previous studies, a reasonable explanation is that Cu + utilized oxygen-containing functional groups of rGO as targets for the in situ growth of Cu 2 O [ 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

A Photochemically Active Cu2O Nanoparticle Endows Scaffolds with Good Antibacterial Performance by Efficiently Generating Reactive Oxygen Species

He,

Zan,

et al. 2024

Nanomaterials

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Cuprous oxide (Cu2O) has great potential in photodynamic therapy for implant-associated infections due to its good biocompatibility and photoelectric properties. Nevertheless, the rapid recombination of electrons and holes weakens its photodynamic antibacterial effect. In this work, a new nanosystem (Cu2O@rGO) with excellent photodynamic performance was designed via the in situ growth of Cu2O on reduced graphene oxide (rGO). Specifically, rGO with lower Fermi levels served as an electron trap to capture photoexcited electrons from Cu2O, thereby promoting electron-hole separation. More importantly, the surface of rGO could quickly transfer electrons from Cu2O owing to its excellent conductivity, thus efficiently suppressing the recombination of electron-hole pairs. Subsequently, the Cu2O@rGO nanoparticle was introduced into poly-L-lactic acid (PLLA) powder to prepare PLLA/Cu2O@rGO porous scaffolds through selective laser sintering. Photochemical analysis showed that the photocurrent of Cu2O@rGO increased by about two times after the incorporation of GO nanosheets, thus enhancing the efficiency of photogenerated charge carriers and promoting electron-hole separation. Moreover, the ROS production of the PLLA/Cu2O@rGO scaffold was significantly increased by about two times as compared with that of the PLLA/Cu2O scaffold. The antibacterial results showed that PLLA/Cu2O@rGO possessed antibacterial rates of 83.7% and 81.3% against Escherichia coli and Staphylococcus aureus, respectively. In summary, this work provides an effective strategy for combating implant-related infections.

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Section: Resultsmentioning

confidence: 99%

A Photochemically Active Cu2O Nanoparticle Endows Scaffolds with Good Antibacterial Performance by Efficiently Generating Reactive Oxygen Species

He,

Zan,

et al. 2024

Nanomaterials

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“…Silver nanoparticles with SPR exhibit significantly higher absorption and scattering intensities . Photogenerated electroporation pairs can be separated at a much faster rate, and more electrons can be injected from semiconductors into noble metals, owing to the noble metal/semiconductor composite substrate, which overcomes the defects of both materials on its own and forms a Schottky barrier at the material interface. − The electrons subsequently proceed quickly to Ag particles with Fermi levels of +0.4 eV versus NHE or to the energy level of g-C 3 N 4 , after which they remain there. A Schottky barrier becomes created on the Ag nanoparticles as the electrons accumulate there, thereby blocking the interaction of photogenerated electrons and holes.…”

Section: Resultsmentioning

confidence: 99%

Versatile Bifunctional Ag@g-C₃N₄/r-GO Catalyst for Efficient Photo- and Electrocatalytic H₂ Production

et al. 2023

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Here, we develop a series of hybrid Ag@g-C 3 N 4 /r-GO nanocomposite materials that are highly active, durable, and adaptable for electro-and photocatalytic H 2 generation under visible light by employing a rapid and simple sonochemical technique. Multiple catalytic behaviors can be achieved through the strategic introduction of Ag metal into a hierarchical structure consisting of photo-and electroactive two-dimensional (2D) sheets with various band configurations. The outcomes of this work show the development of heterojunctions and show how electro-and photocatalysis were both synergistically improved. The fabricated materials were examined for photocatalytic hydrogen evolution, photoelectrocatalytic (PEC) hydrogen evolution, and electrocatalytic hydrogen evolution reaction (HER). In both photocatalytic conditions at 1.5 AM simulated light irradiation and electrocatalytic conditions, silver-doped composites showed better activity. Among all of the fabricated catalysts, the Ag 20% @g-C 3 N 4 /r-GO (A 20 CNG) catalyst displayed the highest apparent quantum yield (AQY) of 1.69 and the highest hydrogen generation rate (954 μmol g −1 h −1 ). However, in the case of electrocatalysis, Ag 15% @g-C 3 N 4 /r-GO (A 15 CNG) showed impressive HER activity with a low overpotential (η) of 0.484 V at 10 mA cm −2 current density with 130.6 mV dec −1 Tafel slope value and also exhibited approximately 16 times more current density than that of g-C 3 N 4 /GO (CNGO) at a fixed overpotential in the HER process; this was also supported by the electrochemical active surface area (ECSA). On the basis of the impressive results shown above, the Ag@g-C 3 N 4 /r-GO (ACNG) catalyst might be a promising and flexible nanocomposite for photo-, photoelectro-, and electrocatalytic hydrogen evolutions. This is the first study to our knowledge that provides the results of a comprehensive examination into the photo-and electrocatalytic application of an interesting and versatile bifunctional catalyst.

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“…The band gap of the Cu/TiO2 is 3.00 eV, with a further reduction observed in the case of the Ag@Cu/TiO2, measuring around 2.86 eV. The band gap reduction in the Ag@Cu/TiO2 indicates the combined effects of Ag and Cu, contributing to the enhanced electron capture through the Schottky effect and surface plasmon resonance [29]. This synergistic effect results in a narrowed…”

Section: α Hυ C Hυ 𝐸mentioning

confidence: 93%

“…This efficiency further decreased to 75.54% at 400 mg/250 mL. This decline in efficiency can be attributed to the desorption and scattering of light beyond a certain threshold dosage of Ag@Cu/TiO2 [29].…”

Section: Effect Of Ag@cu/tio2 Dosagementioning

confidence: 94%

Highly Efficient Visible-Light-Driven Photocatalysis of Rose Bengal Dye and Hydrogen Production Using Ag@Cu/TiO2 Ternary Nanocomposites

Yadav,

Jilani,

Sachan

et al. 2024

Chemistry

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In this work, an Ag@Cu/TiO2 ternary nanocomposite was synthesized by a simple chemical methodology and subsequently studied for the photocatalytic degradation of rose bengal (RB) dye under visible light as well as its hydrogen production. The shape, size and topographical analysis by scanning and transmission electron microscopy revealed that all the constituents are well intercalated and are in the nano range. The energy dispersive X-ray analysis of the Ag@Cu/TiO2 showed the presence of Ti, O, Cu and Ag and the absence of any other impurities, while the mapping analysis showed their uniform distribution. The X-ray photon spectroscopy also showed successful interaction between the components. Furthermore, the changes in the chemical state of Ti2p were examined. The band gap of Ag@Cu/TiO2 using the Tauc plot relations was found to be the lowest at 2.86 eV in comparison to pure TiO2 (3.28 eV), binary Ag/TiO2 (3.13 eV) and Cu/TiO2 (3.00 eV). The Ag@Cu/TiO2 displayed the lowest photoluminescence intensity, suggesting the highest degradation efficiency and lowest recombination rate. The application of Ag@Cu/TiO2 toward the photocatalytic degradation of RB dye exhibited a degradation rate of ~81.07%, which exceeds the efficiency of pure TiO2 by 3.31 times. Apart from this, the hydrogen production of Ag@Cu/TiO2 was found to be 17.1 μmol h−1 g−1, suggesting that copper and silver synergistically contributed, thereby resulting in the increased hydrogen production of pure TiO2.

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Surface plasmon resonance effect on charge transfer in Ag@Cu2O-rGO composites

Cited by 8 publications

References 45 publications

A Photochemically Active Cu2O Nanoparticle Endows Scaffolds with Good Antibacterial Performance by Efficiently Generating Reactive Oxygen Species

A Photochemically Active Cu2O Nanoparticle Endows Scaffolds with Good Antibacterial Performance by Efficiently Generating Reactive Oxygen Species

Versatile Bifunctional Ag@g-C₃N₄/r-GO Catalyst for Efficient Photo- and Electrocatalytic H₂ Production

Highly Efficient Visible-Light-Driven Photocatalysis of Rose Bengal Dye and Hydrogen Production Using Ag@Cu/TiO2 Ternary Nanocomposites

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Surface plasmon resonance effect on charge transfer in Ag@Cu2O-rGO composites

Cited by 8 publications

References 45 publications

A Photochemically Active Cu2O Nanoparticle Endows Scaffolds with Good Antibacterial Performance by Efficiently Generating Reactive Oxygen Species

A Photochemically Active Cu2O Nanoparticle Endows Scaffolds with Good Antibacterial Performance by Efficiently Generating Reactive Oxygen Species

Versatile Bifunctional Ag@g-C3N4/r-GO Catalyst for Efficient Photo- and Electrocatalytic H2 Production

Highly Efficient Visible-Light-Driven Photocatalysis of Rose Bengal Dye and Hydrogen Production Using Ag@Cu/TiO2 Ternary Nanocomposites

Contact Info

Product

Resources

About

Versatile Bifunctional Ag@g-C₃N₄/r-GO Catalyst for Efficient Photo- and Electrocatalytic H₂ Production