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Results for “NOBLE METAL”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Mechanical behavior and size–dependent strength of small noble-metal nanoparticles
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Leveraging bismuth immiscibility to create highly concave noble-metal nanoparticles
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Ultrasound-mediated synthesis of nanoporous fluorite-structured high-entropy oxides toward noble metal stabilization
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An ab-initio study of hydrogen trapping energetics at BCC tungsten metal-noble gas interfaces
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Review of noble metal and metal-oxide-semiconductor based chemiresistive hydrogen sensors
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Mechanochemical Kilogram-Scale Synthesis of Noble Metal Single-Atom Catalysts
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A Noble Metal Substitution Leads to B 12 Cofactor Mimicry by a Rhodibalamin
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Distribution Tendencies of Noble Metals on Fe(100) Using Lattice Gas Cluster Expansions
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Molecular-Scale Insights into the Heterogeneous Interactions between an m -Terphenyl Isocyanide Ligand and Noble Metal Nanoparticles
The structural and chemical properties of metal nanoparticles are often dictated by their interactions with molecular ligand shells. These interactions are highly material-specific and can vary significantly even among elements within the same group or materials with similar crystal structure. In this study, we surveyed the heterogeneous interactions between an m-terphenyl isocyanide ligand and Au and Ag nanoparticles (NPs) at the single-molecule limit. Specifically, we found that the ligation behavior with this molecule differs significantly between that of Au and AgNPs. Surface-enhanced Raman spectroscopy measurements revealed unique enhancement factors for two molecular vibrational modes between two metal surfaces, indicating different ligand binding geometries. Molecular-level characterization using scanning tunneling microscopy allowed us to directly visualize these variations between Ag and Au surfaces, which we assign as two distinct binding mechanisms. This molecular-scale visualization provides clear insights into the different ligand–metal interactions as well as the chemical behavior and spectroscopic characteristics of isocyanide-functionalized NPs.
Using Electrochemistry to Benchmark, Understand, and Develop Noble Metal Nanoparticle Syntheses
The complex chemical nature of metal nanoparticle synthesis presents obstacles for the mechanistic understanding of nanoparticle growth and predictive synthesis design, despite significant progress in this area. Real-time characterization of the chemical processes that take place throughout nanoparticle growth will enable progress toward addressing outstanding challenges in metal nanoparticle synthesis, such as mitigating synthetic reproducibility issues, defining chemical mechanisms that direct nanoparticle growth, and designing synthetic conditions for previously unachievable combinations of nanoparticle shape and composition. In this Perspective, we present open-circuit potential (OCP) measurements as an in situ, real-time method for characterizing chemical changes during nanoparticle growth and discuss the method’s strengths in comparison to and in combination with other characterization techniques. We propose the use of OCP measurements as benchmarks for troubleshooting irreproducibility and streamlining synthetic optimization. Finally, we explore possibilities for using the increased parameter space accessible by electrodeposition to accelerate the development of shape-selective nanoparticle syntheses.
Investigation of a Few Noble Metal Oxides with 17 O Solid-State NMR Spectroscopy
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Interface-mediated noble metal deposition on transition metal dichalcogenide nanostructures
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Fundamental understanding of the synthesis of well-defined supported non-noble metal intermetallic c
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Strategies in photochemical alcohol oxidation on noble-metal free nanomaterials as heterogeneous catalysts
We highlight the challenges and recent progress in using semiconductors to harvest solar energy for carrying out alcohol oxidation.