Shape tunability of copper nanocrystals deposited on nanorods

Chen, Yuexing; Amirav, Lilac

doi:10.1039/d3sc00677h

Cited by 4 publications

(1 citation statement)

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“…There is a large and growing interest in the creation of metal–semiconductor hybrid nanomaterials because of their unique properties and applications including in photocatalysis, − optoelectronics, , and biological imaging/diagnostics. − To efficiently match structure with function, there has been sustained interest in establishing synthetic methods for precise control of their morphology. − A particularly successful approach for tuning these heterostructures has been postsynthetic modification of starting nanoparticle (NP) substrates. − There are several advantages to postsynthetic modification strategies for tuning nanoheterostructure morphology including the improved ability to tailor interfaces within the structure such as interface size, composition, number, and/or extent (e.g., gradient). Strategies such as cation/anion exchange and galvanic replacement have led to remarkably complex structures, ,,,− with both established and still studied new physical and chemical behaviors of interest. − …”

Section: Introductionmentioning

confidence: 99%

Influence of Surface Chemistry on Metal Deposition Outcomes in Copper Selenide-Based Nanoheterostructure Synthesis

Sen,

Millheim,

Gordon

et al. 2024

Langmuir

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The use of nanoparticle surface chemistry to direct metal deposition has been well-studied in the modification of metal nanoparticle substrates but is not yet well-established for metal chalcogenide particle substrates, although integration of these particles into nanoheterostructures is of high interest. In this report, we investigate the effect of Cu2–x Se surface chemistry on the morphology of metal deposition on these plasmonic semiconductor nanoparticles. Specifically, we functionalize Cu2–x Se nanoparticles with a suite of 12 different ligands and investigate how different aspects of the ligand structure do or do not impact the morphology and extent of subsequent metal deposition on the Cu2–x Se surface. Surprisingly, our results indicate that the morphology of the resulting metal deposits and the extent of metal deposition onto the existing Cu2–x Se particle substrate are indistinguishable for the majority of ligands tested. An exception to these findings is observed for particles functionalized by quaternary alkylammonium bromides, which exhibit statistically distinct metal deposition patterns compared to all other ligands tested. We hypothesize that this unique behavior is due to a cooperative binding mechanism of the quaternary alkylammonium bromides to the surface of copper selenide. Taken together, these results yield both new strategies for controlling postsynthetic modification of copper selenide nanoparticles and also reveal limitations of surface chemistry-based approaches for this system.

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Section: Introductionmentioning

confidence: 99%

Influence of Surface Chemistry on Metal Deposition Outcomes in Copper Selenide-Based Nanoheterostructure Synthesis

Sen,

Millheim,

Gordon

et al. 2024

Langmuir

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Electron Donor‐Specific Surface Interactions Promote the Photocatalytic Activity of Metal‐Semiconductor Nanohybrids

Wengler‐Rust,

Staechelin,

Lange

et al. 2024

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In the past two decades, the application of colloidal semiconductor‐metal nanoparticles (NPs) as photocatalysts for the hydrogen generation from water has been extensively studied. The present body of literature studies agrees that the photocatalytic yield strongly depends on the electron donating agent (EDA) added for scavenging the photogenerated holes. The highest reported hydrogen production rates are obtained in the presence of ionic EDAs and at high pH. The large hydrogen production rates are attributed to fast hole transfer from the NP onto the EDAs. However, the present discussions do not treat the influence of EDA‐specific surface interactions. This systematic study focuses on that aspect by combining steady‐state hydrogen production measurements with time‐resolved and static optical spectroscopy, employing 11‐mercaptoundecanoic acid‐capped, Pt‐tipped CdSe/CdS dot‐in‐rods in the presence of a large set of EDAs. Based on the experimental results, two distinct EDA groups are identified: surface‐active and diffusion‐limited EDAs. The largest photocatalytic efficiencies are obtained in the presence of surface‐active EDAs that induce an agglomeration of the NPs. This demonstrates that the introduction of surface‐active EDAs can significantly enhance the photocatalytic activity of the NPs, despite reducing their colloidal stability and inducing the formation of NP networks.

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Simultaneous H2 fuel evolution and value-added organic transformation from a one-dimensional noble-metal-free photocatalyst with spatially separated catalytic sites

Chen,

Xie,

et al. 2024

Applied Catalysis B: Environmental

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Shape tunability of copper nanocrystals deposited on nanorods

Abstract: The significant role of metal particle geometry in dictating catalytic activity, selectivity, and stability is well established in heterocatalysis. However, this topic is rarely explored in semiconductor-metal hybrid photocatalytic systems,...

Cited by 4 publications

References 65 publications

Influence of Surface Chemistry on Metal Deposition Outcomes in Copper Selenide-Based Nanoheterostructure Synthesis

Influence of Surface Chemistry on Metal Deposition Outcomes in Copper Selenide-Based Nanoheterostructure Synthesis

Electron Donor‐Specific Surface Interactions Promote the Photocatalytic Activity of Metal‐Semiconductor Nanohybrids

Simultaneous H2 fuel evolution and value-added organic transformation from a one-dimensional noble-metal-free photocatalyst with spatially separated catalytic sites

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