Spectral characteristics upon harvesting plasmonic hot electrons at the Ag/ZnO heteromicrostructures

Rahman, Dewan S.; Pal, Sudip Kumar; Singha, Shib Shankar; Kundu, Susmita; Basu, Soumen; Ghosh, Sujit Kumar

doi:10.1039/d0ma00362j

Cited by 6 publications

(3 citation statements)

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“…Furthermore, upon photointeraction, electrons of the Ag nanoparticles were excited on the femtosecond timescale because of the SPR effect. These excited plasmonic electrons can be transferred to the CB of ZnO (pathway II), increasing the number of e − CB in ZnO [50]. In brief, the Ag/ZnO heterostructure prolonged the lifetime of the e − CB via both charge transfer (pathway I) and increasing the number of electrons in ZnO via the SPR effect (pathway II).…”

Section: Resultsmentioning

confidence: 99%

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Enhanced photocatalytic activity of Ag/ZnO nanocomposite immobilized on kanthal coils

Le,

Tuan

et al. 2024

Phys. Scr.

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Constructing hybrid semiconductor photocatalysts and increasing the charge-carrier density are effective strategies for enhancing the photocatalytic performance of ZnO. This study elucidates the synergistic effects of electron trapping and surface plasmon resonance (SPR) on the activity of ZnO photocatalysts. Ag/ZnO nanocomposites were synthesized on Kanthal coils using a two-step method involving the immobilization of ZnO on Kanthal coils and the coupling of Ag nanoparticles. XPS and RTPL analyses verified the synergistic effects of electron trapping and SPR on the activity of the Ag/ZnO nanocomposites. The photocatalytic performance of the composite was evaluated in the degradation of rhodamine B (RhB) dye. The Ag/ZnO nanocomposite exhibited significantly enhanced removal efficiency for RhB dye (38.2‒70.5% depending on the deposition time). The Ohmic contact at the Ag/ZnO heterojunction extended the lifetime of the photoinduced charge carriers, whereas the SPR facilitated the generation of more electrons for the photocatalytic reaction. However, the excessive deposition of Ag nanoparticles compromised the photocatalytic performance of the Ag/ZnO nanocomposite. This study provides valuable insights for developing efficient ZnO-based photocatalytic materials for addressing environmental challenges.

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Section: Resultsmentioning

confidence: 99%

“…Figure 9(b) shows a schematic energy-band diagram of the Ag/ZnO nanocomposite. The work function of metal Ag nanoparticles (f Ag ) is 4.2 eV, which is smaller than that of semiconductor ZnO (f ZnO = 5.3 eV)[50]. With the deposition of the Ag nanoparticles (4 nm in diameter), an Ohmic contact was formed between ZnO and Ag.…”

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confidence: 99%

Enhanced photocatalytic activity of Ag/ZnO nanocomposite immobilized on kanthal coils

Le,

Tuan

et al. 2024

Phys. Scr.

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“…The XRD pattern displays that there is no change in the peaks of Ag-Bi 2 O 3 -ZnO heterostructure after Ag loading implying that Ag nanoparticles are not incorporated into the lattice structure of heterostructured Ag-Bi 2 O 3 -ZnO, but rather deposited on its surface. [40][41][42] The Deby-Scherrer equation (Equation (S1)) was used to calculate the crystallite size. The crystallite sizes for Bi 2 O 3 , ZnO, and Ag-Bi 2 O 3 -ZnO (sample 3AgBZ) were observed to be 45.21, 49.13 and 56.66 nm respectively.…”

Section: Crystal Structure Studymentioning

confidence: 99%

Selective Photocatalytic CO₂ Reduction Through Plasmonic Z‐Scheme Ag‐Bi₂O₃‐ZnO Heterostructures

Alnaggar,

Alkanad,

Bajiri

et al. 2024

ChemistrySelect

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Combination of plasmonic noble metal with semiconductors offers a promising and potential solar energy harvesting and conversion route. Herein, plasmonic Z‐scheme Ag‐Bi2O3‐ZnO (AgBZ) heterostructure is designed and synthesized via solution combustion and photo‐deposition method. Metallic Ag nanoparticles (NPs) were deposited over Bi2O3‐ZnO heterostructure; thus, they exhibit strong visible light absorption owing to surface plasmon resonance (SPR). The photocatalytic efficiency of the synthesized catalysts is investigated by the photocatalytic CO2 reduction to fuels under simulated solar light irradiation. The present system has shown an outstanding photocatalytic CO2 reduction and excellent selectivity of CO. The evolved rate of CO fuel, the amount of CO produced per unit time, over optimized Ag‐Bi2O3‐ZnO (3AgBZ) heterostructures was (96.74 μmol g−1/h) which was approximately 12 times larger than that of Bi2O3‐ZnO (0AgBZ) and 49‐fold than the quantity of evolved CO fuels over pure ZnO photocatalyst. The percentage of evolved CO to CH4 fuels over optimized Ag‐Bi2O3‐ZnO (3AgBZ) heterostructures was about 50 : 1compared to that of 2 : 3 over Bi2O3‐ZnO (0AgBZ). The great improvement and the high selectivity would be ascribed to the synergistic effect of metallic surface plasmon resonance and the Z‐scheme charges transfer system. This work would open a window to construct a single photocatalyst with different charge separation systems and excellent CO2 reduction selectivity. Finally, the mechanism for the enhanced photocatalytic performance by the synergistic effect was described and discussed.

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Fabrication of highly efficient g-C3N4/ZnO/Fe2O3 ternary composite with enhanced photocatalytic activity under visible light irradiation

Shanthini

Manivannan

Govindaraju³

et al. 2022

J Mater Sci: Mater Electron

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Spectral characteristics upon harvesting plasmonic hot electrons at the Ag/ZnO heteromicrostructures

Abstract: Silver/zinc oxide heterostructures have been adopted to investigate the spectral properties that are of paramount importance to demonstrate the feasibility of band gap engineering upon injection of hot electrons in...

Cited by 6 publications

References 69 publications

Enhanced photocatalytic activity of Ag/ZnO nanocomposite immobilized on kanthal coils

Enhanced photocatalytic activity of Ag/ZnO nanocomposite immobilized on kanthal coils

Selective Photocatalytic CO₂ Reduction Through Plasmonic Z‐Scheme Ag‐Bi₂O₃‐ZnO Heterostructures

Fabrication of highly efficient g-C3N4/ZnO/Fe2O3 ternary composite with enhanced photocatalytic activity under visible light irradiation

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Spectral characteristics upon harvesting plasmonic hot electrons at the Ag/ZnO heteromicrostructures

Abstract: Silver/zinc oxide heterostructures have been adopted to investigate the spectral properties that are of paramount importance to demonstrate the feasibility of band gap engineering upon injection of hot electrons in...

Cited by 6 publications

References 69 publications

Enhanced photocatalytic activity of Ag/ZnO nanocomposite immobilized on kanthal coils

Enhanced photocatalytic activity of Ag/ZnO nanocomposite immobilized on kanthal coils

Selective Photocatalytic CO2 Reduction Through Plasmonic Z‐Scheme Ag‐Bi2O3‐ZnO Heterostructures

Fabrication of highly efficient g-C3N4/ZnO/Fe2O3 ternary composite with enhanced photocatalytic activity under visible light irradiation

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Selective Photocatalytic CO₂ Reduction Through Plasmonic Z‐Scheme Ag‐Bi₂O₃‐ZnO Heterostructures