Cu–Ag alloy for engineering properties and applications based on the LSPR of metal nanoparticles

Jian, Chao-chao; Zhang, Jianqi; Ma, Xiangchao

doi:10.1039/d0ra01474e

Cited by 37 publications

(25 citation statements)

References 34 publications

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“…Therefore, the IPDF ε 2 (ω) of MoSi 2 N 4 is obtained by summing the results of eqs and , and the real part of the dielectric function ε 1 (ω) is obtained by Kramers–Kronig transformation . Finally, the optical absorption coefficient α(ω) is calculated by eq (where c is the speed of light in vacuum). , As shown in Figure , the trend for the optical absorption spectra of pristine MoSi 2 N 4 from our theoretical calculation is consistent with the experimental measurement . The absorption efficiency progressively decreases as the wavelength increases.…”

Section: Resultssupporting

confidence: 76%

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Strained MoSi₂N₄ Monolayers with Excellent Solar Energy Absorption and Carrier Transport Properties

Jian

Zhang

et al. 2021

J. Phys. Chem. C

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The recently synthesized two-dimensional (2D) MoSi2N4 material with a proper band gap and excellent environmental stability promises potential optoelectronic applications. On the basis of first-principles calculations and electron–phonon interaction theory, we systematically analyze the structural, optical, carrier distribution and transport, and photocatalytic water-splitting properties of pristine and strained MoSi2N4 monolayers. They are all found to be dynamically stable. Their optical absorption efficiencies are very high for photon energy larger than the respective band gap. Surprisingly, the optical absorption coefficient of tensile MoSi2N4 is as large as 106 cm–1 across 300–880 nm. To the best of our knowledge, this is the best among optoelectronic materials in the visible region. In addition, compressive strain results in spatial separation of photogenerated electrons and holes, which is beneficial for increasing their separation rates. Transport properties indicate that the lifetime and mean free path (MFP) of photogenerated electrons and holes are, respectively, on the scale of several femtoseconds and within 1.5 nm. Tensile strain notably increases them, becoming comparable to conventional semiconductor Si. Finally, pristine and strained MoSi2N4 monolayers are predicated to be able to photooxidize and photoreduce H2O with proper band edges and H2O adsorption capacities. These systematic characterizations not only deepen understanding of the physical and optoelectronic properties of MoSi2N4 but also indicate promising applications of MoSi2N4 in electronics, optoelectronics, and photocatalytic water splitting.

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Section: Resultssupporting

confidence: 76%

“…33 Finally, the optical absorption coefficient α(ω) is calculated by eq 3 (where c is the speed of light in vacuum). 34,35 α ω ω ε ω ε ω ε ω…”

Section: ■ Computational Methodsmentioning

confidence: 99%

Strained MoSi₂N₄ Monolayers with Excellent Solar Energy Absorption and Carrier Transport Properties

Jian

Zhang

et al. 2021

J. Phys. Chem. C

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“…The DOS of Au 1– x Cu x below the Fermi level consists mainly of d-bands and is bimodal as the lower and higher energy contributions originate from Au and Cu components, respectively. The bimodality is a characteristic feature found in the DOS of both Au–Cu and Ag–Cu intermetallics. , As the Cu content increases, the upper part of the d-band DOS that is mainly contributed by Cu atoms becomes thicker and its top edge exhibits higher DOS on approaching the Fermi level. The interband transitions in the higher Cu-content alloy are more likely to occur with lower excitation energies.…”

Section: Resultsmentioning

confidence: 99%

Abnormal Hypsochromic Shifts of Surface Plasmon Scattering by Atomic Ordering in Gold–Copper Intermetallic Nanoparticles

Kim

Park

et al. 2021

J. Phys. Chem. C

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Alloy nanoparticles are of importance to tailor their physical and chemical characteristics, which can overcome the limits of monometallic materials. In particular, the plasmonic properties of metal alloys are primarily tuned by varying their alloy composition and electronic structure. The alloys tend to be described as a linear combination of the constituent elements, and their plasmonic characteristics are also expected to follow Vegard’s rule. In this study, we demonstrated the importance of atomic ordering in Au–Cu alloy nanoparticles, which exhibited a rather opposite trend of photophysical properties against such rough estimation for random alloys. The intermetallic Au3Cu, AuCu, and AuCu3 nanoparticles with a diameter of 20 nm were synthesized using a modified co-reduction method under identical aqueous environments. The alloys were characterized by X-ray spectroscopic techniques precisely, confirming their compositions and atomic arrangements in crystals. Notably, plasmon light scattering on intermetallic nanoparticles collected by single-particle dark-field spectroscopy exhibited unexpected abnormal hypsochromic shifts with the Cu content increase, in contrast to linear bathochromic shifts of random alloys. Density functional theory calculations considered the combined effect of both intraband and interband transitions in the intermetallic compounds and successfully confirmed the hypsochromic shifts of the plasmon bands by atomic ordering in the Au–Cu alloys. Our findings suggest that atomic engineering in alloy nanoparticles, by modulating their intrinsic complex permittivities, provide a new way for regulating plasmonic optical properties and developing various alloy systems with desired photophysical properties.

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“…[2] On the other hand, silver-based alloys is nominated as smart materials suitable for advanced engineering issues. [3] One of these alloys is copper-silver alloys which are mentioned ideal for used as electrical contact materials and heat exchanger materials as well. [3] Various techniques are employed to prepare AgMn alloys.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Orthorhombic AgMn Alloys by the Pulsed Laser Welding Technique

Khanfar¹,

Qasrawi

2022

Crystal Research and Technology

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Herein, AgMn alloys are prepared by the pulsed laser welding technique in an argon atmosphere. The effect of the laser pulses width and stoichiometric composition of the alloys on the structural, compositional, morphological, and electrical properties are investigated. In contrast to the traditional preparation techniques which reveal cubic structure of AgMn alloys, the pulsed laser welding technique reveals the orthorhombic phase of the alloys. The lattice parameters of the orthorhombic phase of AgMn are α=13.0250normalÅ,b=15.7768normalÅ,c=2.6728normalÅ$\alpha = 13.0250\ \text{\AA} ,\ b=15.7768\ \text{\AA} ,\ c=2.6728\ \text{\AA} $. It is observed that pulse widths of 50 ms are the optimum from preparing these alloys. From an electrical point of view, the AgMn alloys exhibit negative dielectric constant and negative conductance effect in the microwave frequency domain. The impedance spectroscopy analyses in the frequency domain of 0.01–1.80 GHz have shown that AgMn alloys can be employed as band filters with return loss value of ≈16 dB. The features of the AgMn alloys which are achieved by the pulsed laser welding technique nominate them for use as negative capacitance and negative conductance transistors. These devices are suitable for noise reduction and parasitic capacitance cancellation.

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Cu–Ag alloy for engineering properties and applications based on the LSPR of metal nanoparticles

Abstract: Alloying Ag with Cu can effectively improve the generation rates of high-energy hot carriers.

Cited by 37 publications

References 34 publications

Strained MoSi₂N₄ Monolayers with Excellent Solar Energy Absorption and Carrier Transport Properties

Strained MoSi₂N₄ Monolayers with Excellent Solar Energy Absorption and Carrier Transport Properties

Abnormal Hypsochromic Shifts of Surface Plasmon Scattering by Atomic Ordering in Gold–Copper Intermetallic Nanoparticles

Preparation and Characterization of Orthorhombic AgMn Alloys by the Pulsed Laser Welding Technique

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Cu–Ag alloy for engineering properties and applications based on the LSPR of metal nanoparticles

Abstract: Alloying Ag with Cu can effectively improve the generation rates of high-energy hot carriers.

Cited by 37 publications

References 34 publications

Strained MoSi2N4 Monolayers with Excellent Solar Energy Absorption and Carrier Transport Properties

Strained MoSi2N4 Monolayers with Excellent Solar Energy Absorption and Carrier Transport Properties

Abnormal Hypsochromic Shifts of Surface Plasmon Scattering by Atomic Ordering in Gold–Copper Intermetallic Nanoparticles

Preparation and Characterization of Orthorhombic AgMn Alloys by the Pulsed Laser Welding Technique

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Strained MoSi₂N₄ Monolayers with Excellent Solar Energy Absorption and Carrier Transport Properties

Strained MoSi₂N₄ Monolayers with Excellent Solar Energy Absorption and Carrier Transport Properties