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Complementary Reducing Agents are Responsible for Temporally Distinct Nucleation and Growth Phases during the Polyol Synthesis of Ag Nanocubes.
Angew Chem Int Ed Engl
December 2024
Stellenbosch University Department of Chemistry and Polymer science, Chemistry and Polymer Science, SOUTH AFRICA.
Ethylene glycol or one of its oxidation products are believed to serve as reducing agents in the shape-controlled synthesis of Ag nanocubes (NCs) by the polyol process. The identity of end-groups of polyvinylpyrrolidone (PVP) impacts shape control with alcohol and aldehyde moieties serving as a primary Ag reducing agent. We explored the role of PVP end-groups in the polyol process by measuring the dependence of particle number density of Ag NCs produced on the initial concentration(s) of Ag and PVP using small angle x-ray scattering and statistically large particle size distributions analyzed by scanning electron microscopy.
View Article and Find Full Text PDFSi-H Hydrosilane Reducing Agents for Size- and Shape-Controlled InAs Colloidal Quantum Dots.
Adv Mater
December 2024
Center for Renewable Energy and Storage Technologies (CREST), Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia.
Article Synopsis
- A new reducing agent based on hydrosilanes (Si-H) allows for synthesis of high-quality, monodisperse InAs CQDs with tunable excitonic peaks, avoiding harmful compounds that cause surface oxidation.
- These CQDs exhibit excellent optoelectronic properties, leading to photodetectors with low dark current, good quantum efficiency, and fast photoresponse times, while eliminating a major barrier related to (TMS)As usage
IrPdCuFeNiCoMo Based Core-Shell Icosahedron Nanocrystals and Nanocages for Efficient and Robust Acidic Oxygen Evolution.
Angew Chem Int Ed Engl
December 2024
New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
Facets engineering of high entropy alloy (HEA) nanocrystals might be achieved via shape-controlled synthesis, which is promising but remains challenging in designing Ir-based catalysts towards efficient and robust oxygen evolution reaction (OER) in acidic medium. Herein, icosahedra nanocrystals featured with PdCu core and IrPdCuFeNiCoMo shell were prepared by wet-chemical reduction in one-pot, ascribing to the initial formation PdCu core and subsequent deposition and diffusion of IrPdCuFeNiCoMo HEA shell. Sequential selective chemical etching of PdCu core results in IrPdCuFeNiCoMo HEA nanocages, delivering an overpotential of 235 mV at 10 mA cm, 51.
View Article and Find Full Text PDFShape-controlled movement of Zn/SU-8 micromotors.
Nanoscale Adv
December 2024
The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Health Technology, Technical University of Denmark Ørsted Plads, 2800 Kgs. Lyngby Denmark
Creating micromotors (MMs) that will have the highest possible velocities has become one of the main focuses in the field of autonomous microdevices research. The importance of velocity stems from various autonomous microdevices applications, ranging from faster drug delivery to the eradication of various bacterial biofilms using only mechanical movement. To investigate how different shapes affect the velocity of Zn/SU-8 micromotors in acid solution, we fabricated micromotors with various geometries (Zn/SU-8/Cylindrical, Zn/SU-8/Rectangular cuboid, Zn/SU-8/Triangular prism, Zn/SU-8/Pentagonal prism and Zn/SU-8/Pentagrammic prism MMs).
View Article and Find Full Text PDFShape-Controlled Growth and Characterization of CdS Nanocrystals via Liquid Cell Transmission Electron Microscopy.
Molecules
November 2024
School of Information Technology, Jiangsu Open University, Nanjing 210036, China.
Controlling the growth, structure, and shape of CdS nanocrystals is crucial for harnessing their unique physicochemical properties across diverse applications. This control can be achieved by introducing chemical additives into the synthesis reaction mixture. However, precise manipulation of nanocrystal synthesis necessitates a thorough understanding of the formation mechanisms under various chemical conditions, a task that remains challenging.
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