Noble-transition metal alloys offer emergent optical and electronic properties for near-infrared (NIR) optoelectronic devices. We investigate the optical and electronic properties of CuPd alloy thin films and their ultrafast electron dynamics under NIR excitation. Ultraviolet photoelectron spectroscopy measurements supported by density functional theory calculations show strong d-band hybridization between the Cu 3d and Pd 4d bands. These hybridization effects result in emergent optical properties, most apparent in the dilute Pd case. Time-resolved terahertz spectroscopy with NIR (e.g., 1550 nm) excitation displays composition-tunable electron dynamics. We posit that the negative peak in the normalized increment of transmissivity (ΔT/T) below 2 ps from dilute Pd alloys is due to non-thermalized hot-carrier generation. On the other hand, Pd-rich alloys exhibit an increase in ΔT/T due to thermalization effects upon ultrafast NIR photoexcitation. CuPd alloys in the dilute Pd regime may be a promising material for future ultrafast NIR optoelectronic devices.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1063/5.0102066 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Engineering a Cu-Pd Paddle-Wheel Metal-Organic Framework for Selective CO Electroreduction.
Angew Chem Int Ed Engl
December 2024
Chair of Inorganic and Metal-Organic Chemistry, Department of Chemistry and TUM School of Natural Sciences, Technical University of Munich, Lichtenbergstraße 4, D-85748, Garching, Germany.
Article Synopsis
- Optimizing the binding energy at active sites is essential for improving the selectivity and activity of catalysts in the electrochemical reduction of CO2. !* -
- Copper is effective in reducing CO to hydrocarbons but struggles with product selectivity due to moderate binding energies of intermediates; a new Cu-Pd dimer structure is proposed using a metal-organic framework (MOF) to address this issue. !* -
- The incorporation of palladium into the Cu-Pd structure enhances the adsorption of the COOH* intermediate, leading to more selective generation of carbon monoxide and deepening the understanding of catalyst structure-activity relationships. !*
Entropy-Derived Synthesis of the CuPd Sub-1nm Alloy for CO-to-acetate Electroreduction.
J Am Chem Soc
October 2024
Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing 100084, China.
Bimetallic alloys exhibit remarkable properties in catalysis and energy storage, while their precise synthesis at the subnanoscale remains a formidable challenge due to their immiscible nature in thermodynamics. In this study, we engineer an atomically dispersed CuPd alloy with an average size of 1.5 nm loaded on CuO and phosphomolybdic acid (PMA) coassembly subnanosheets (CuO-PMA SNSs).
View Article and Find Full Text PDFPhotothermal Antibacterial and Osteoinductive Polypyrrole@Cu Implants for Biological Tissue Replacement.
Materials (Basel)
August 2024
College of Chemical Engineering, Xinjiang Normal University, 102 Xinyi Road, Urumqi 830054, China.
The treatment of bone defects caused by disease or accidents through the use of implants presents significant clinical challenges. After clinical implantation, these materials attract and accumulate bacteria and hinder the integration of the implant with bone tissue due to the lack of osteoinductive properties, both of which can cause postoperative infection and even lead to the eventual failure of the operation. This work successfully prepared a novel biomaterial coating with multiple antibacterial mechanisms for potent and durable and osteoinductive biological tissue replacement by pulsed PED (electrochemical deposition).
View Article and Find Full Text PDFOrdering Bimetallic Cu-Pd Catalysts onto Orderly Mesoporous SrTiO-Crystal Nanotubular Networks for Efficient Carbon Dioxide Photoreduction.
Angew Chem Int Ed Engl
July 2024
Laboratory for Catalysis Engineering, School of Chemical and Biomolecular Engineering & Sydney Nano Institute, The University of Sydney, Darlington, New South Wales, 2008, Australia.
Artificial photosynthesis of fuels has garnered significant attention, with SrTiO emerging as a potential candidate for photocatalysis due to its exceptional physicochemical properties. However, selectively converting CO into fuels with desired reaction products remains a grand challenge. Herein, we design an updated method via an aging strategy based on the electrospinning technique to synthesize a single-crystalline Al-doped SrTiO nanotubular networks with self-assembled orderly mesopores, further modified by Cu-Pd alloy.
View Article and Find Full Text PDFDirect Synthesis of CuPd Icosahedra Supercrystals Studied by In Situ X-Ray Scattering.
Small
August 2024
Institute for Nanostructure and Solid-State Physics, Center for Hybrid Nanostructures, University of Hamburg, 22761, Hamburg, Germany.
Nanocrystal self-assembly into supercrystals provides a versatile platform for creating novel materials and devices with tailored properties. While common self-assembly strategies imply the use of purified nanoparticles after synthesis, conversion of chemical precursors directly into nanocrystals and then supercrystals in simple procedures has been rarely reported. Here, the nucleation and growth of CuPd icosahedra and their consecutive assembly into large closed-packed face-centered cubic (fcc) supercrystals are studied.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!