We show that many complex gold nanostructures such as the water chestnut, dog bone, nanobar, and octahedron, which are not easily accessible via a direct seed-growth synthesis approach, can be prepared overgrowth of same nanorods by varying pH Ag concentrations in growth solution. Overgrown nanostructures' shapes were determined rate atom deposition, is faster at higher pH. In presence AgNO3, codeposition silver atoms affects overgrown nanostructures, particularly high

End-to-end dimers of gold nanorods are predicted to be excellent substrates for surface-enhanced spectroscopy. However, the synthesis solution-stable end-to-end remains challenging. We exploit pH-dependent configurational change polyelectrolytes initiate and terminate nanorod assembly formation produce linked in high yield. The first overcoated with a polyelectrolyte, attachment is initiated by adding thiol linker acidic medium. then terminated at dimer stage changing pH medium addition an...

Bimetallic nanoparticle dyads consisting of a plasmonic core and catalytic metal shell have attracted significant attention in the context solar-driven photocatalysts. However, pertinent design considering both optical properties thickness material is scarce. Through experiments simulations, we demonstrated that photocatalytic efficiency Au triangular nanoprisms@Pd (AuTP@Pd) core@shell dyad largely depends on shell. For lower thickness, showed enhanced activity compared to bare AuTPs. for...

Development of robust and efficient photocatalytic constructs to facilitate the water oxidation reaction (WOR) remains essential for various renewable energy technologies. Here we report on developing Au@MnOx core–shell nanoparticles that perform electrochemical WOR at a low onset overpotential requirement approximately 230 mV. Under visible light excitation, activity catalytic construct showed further improvement with decrease generation photocurrent 128 μA/cm2 1 V applied potential. The...

End-to-end assemblies of anisotropic plasmonic nanostructures with small nanogaps are great interest as they create strong hot spots for enhancing weak fluorescence and/or scattering molecules. Here we report the growth dithiol-linked end-to-end gold nanorods from dimers to large networks containing thousands individual nanorods, directed by in situ tuning nanorod's surface charge. Surface charge was lowered initiate aggregation process but subsequently increased achieve slow tip-specific...

Here, we show that nanoparticles' surface charge is a key factor determines their tip-specificity in covalently linked assembly of anisotropic plasmonic nanoparticles. We developed strategy to controllably tune the gold nanoparticles over broad ζ potential range between −5 and −35 mV using simple acid–base chemistry showed dithiol-driven, end-to-end dimers nanorods were formed reproducibly within −10 −17 acetonitrile medium. Below this range, collapse together form large clusters without any...

Pt and its alloys are commonly used as catalysts for electrochemical methanol oxidation reaction (MOR), owing to their high efficiencies. However, the cost instability of these due poisoning from intermediates restrict large-scale applications. Here we study plasmonic porous Au–Ag nanoparticles toward photoelectrochemical MOR. We synthesized Au–Ag@Au nanostructures that consist Au nanorod core shell, where nanopores were created via selectively etching Ag atoms. The demonstrated...

The development of robust and efficient photocatalytic constructs for boosting the water oxidation reaction (WOR) is needed establishing a sunlight-driven renewable energy infrastructure. Here, we synthesized plasmonic core-shell nanoconstructs consisting triangular gold nanoprism (AuTNP) core with mixed manganese oxide (MnOx) shell photoelectrocatalytic WOR. These show electrocatalytic WOR low onset overpotential requirement 270 mV at pH 10. Photoexcitation showed further enhancement their...

Development of robust and efficient photocatalytic constructs for boosting the water oxidation reaction (WOR) is needed establishing a sunlight-driven renewable energy infrastructure. Here we synthesized plasmonic core-shell nanoconstructs consisting triangular gold nanoprism (Au-TNP) core with mixed manganese oxide (MnOx) shell photoelectrocatalytic WOR. These show electrocatalytic WOR low onset overpotential requirement 270 mV at pH 10.5. Photoexcitation showed further enhancement their...

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