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Photocatalytic Semiconductor-Metal Hybrid Nanoparticles: Single-Atom Catalyst Regime Surpasses Metal Tips.
ACS Nano
January 2025
Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
Semiconductor-metal hybrid nanoparticles (HNPs) are promising materials for photocatalytic applications, such as water splitting for green hydrogen generation. While most studies have focused on Cd containing HNPs, the realization of actual applications will require environmentally compatible systems. Using heavy-metal free ZnSe-Au HNPs as a model, we investigate the dependence of their functionality and efficiency on the cocatalyst metal domain characteristics ranging from the single-atom catalyst (SAC) regime to metal-tipped systems.
View Article and Find Full Text PDFA Prenucleation-Stage Sample of ZnSe Assisting Lower-Temperature Shell Growth on CdSe Magic-Size Clusters via Monomer Addition.
Small
January 2025
Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.
Article Synopsis
- Researchers successfully performed surface passivation of colloidal semiconductor nanocrystals at room temperature (25 °C), unlike the typical high-temperature methods, using prenucleation-stage ZnSe clusters prepared at 160 °C.
- This approach enabled the transformation of photoluminescent (PL)-inactive CdSe magic-size clusters (MSCs) into PL-active ones, which produced a sharp photoluminescent signal at 460 nm.
- The study reveals that the formation of Zn-Se bonds occurs independently of the actual growth of the ZnSe shell and highlights the principle of isodesmic reactions, paving the way for milder surface passivation techniques.
High-Performance Giant InP Quantum Dots with Stress-Released Morphological ZnSe-ZnSeS-ZnS Shell.
Adv Mater
January 2025
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan.
Article Synopsis
- Indium phosphide (InP) quantum dots (QDs) are being explored as safer alternatives to cadmium-based QDs, but their stability can be a major issue.
- A thick ZnS shell is commonly used to protect InP cores from degradation and to improve luminescence; however, the difference in lattice structure between InP and ZnS can lead to defects that reduce efficiency.
- This research outlines a new method to create InP QDs with improved stability and luminescence by managing the shell growth process; the resulting QDs exhibit a photoluminescence quantum yield of about 90%, showcasing potential for applications in eco-friendly technologies.
Trapping light in air with membrane metasurfaces for vibrational strong coupling.
Nat Commun
November 2024
Department of Biomedical Engineering, University of Wisconsin-Madison Madison, Madison, WI, 53706, USA.
Article Synopsis
- Optical metasurfaces can control electromagnetic waves at very thin surfaces, specifically in the mid-infrared (mid-IR) region, enhancing applications like biochemical sensing and spectroscopy.
- Current mid-IR metasurfaces are often made on substrates that reduce performance and complicate access to important electromagnetic hotspots, while alternative IR-transparent materials can be problematic or costly.
- This study introduces new free-standing silicon (Si) membrane metasurfaces that improve light trapping and resonance quality, enabling scalable production and advanced applications in fields like quantum mechanics and biochemical sensing.
Plausible Colloidal Methods to Synthesize Semiconductor Nanowires: Deep Study From ZnSe Nanorods.
Small
January 2025
Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun, 130012, China.
When the diameter of semiconductor nanowires is below the Bohr radius, confined excitons in the radial direction can freely move along the elongated axis direction, highlighting their potential for applications in quantum information and optoelectronic devices. Controlled anisotropic growth and oriented attachment are viable strategies for producing ultra-long semiconductor nanowires with precisely controlled lengths and diameters. Anisotropic ZnSe nanorods are used as the initial seeds for the controlled anisotropic growth and oriented attachment methods.
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