Synthesis of Convex Hexoctahedral Palladium@Gold Core–Shell Nanocrystals with {431} High-Index Facets with Remarkable Electrochemiluminescence Activities

Abstract

Convex hexoctahedral nanocrystals have been synthesized through fast growth kinetics and the use of cetylpyridinium chloride as a capping agent. Monodisperse convex hexoctahedral Pd@Au core-shell nanocrystals with {431} high-index facets are obtained at high reaction rates by using high concentrations of ascorbic acid in the presence of cetylpyridinium chloride. In contrast, octahedral nanocrystals with {111} low-index facets and their {100}-truncated counterparts are formed at low ascorbic acid concentrations. The substitute of cetylpyridinium chloride with cetyltrimethylammonium chloride leads to the generation of concave trisoctahedral Pd@Au core-shell nanocrystals with {331} high-index facets, indicating that cetylpyridinium plays an important role in the formation of convex hexoctahedral nanocrystals. The as-prepared convex hexoctahedral Pd@Au core-shell nanocrystals exhibit remarkable catalytic performances toward electrochemiluminescence compared with truncated octahedral and concave trisoctahedral Pd@Au core-shell nanocrystals.

Highly Symmetric Gold Nanostars: Crystallographic Control and Surface-Enhanced Raman Scattering Property

“…Noble metal NCs enclosed by high-index facets has received considerate attention in recent years and have been proved to exhibit superior performances in catalysis. [27][28][29][30][31][32] However, highindex facets usually possess high surface energy and their synthesis is very challenging, especially for the {hkl} family. 31,32 Besides DMA, we further discovered that methylamine, ethylamine, butylamine, and octylamine can be also exploited in the synthesis of highly symmetric Au nanostars enclosed with high-index facets (Figure 3, S11-14).…”

Alloy oxidation as a route to chemically active nanocomposites of gold atoms in a reducible oxide matrix

“…Recent progress in nanoparticle synthesis has provided access to a large family of particle configurations, including alloys, [1][2][3][4] core-shell structures, [4][5][6][7][8][9] and Janus particles, 10 among others. Given the very different chemical, electronic, and optical properties of metals and metal oxides, the oxidation of bimetallic systems promises further extended tunability of multifunctional nanomaterials for applications in plasmonics, 11 imaging, 12 energy storage, 13 surface chemistry, 14 and electrocatalysis.…”

Chemiluminescence and electrochemiluminescence applications of metal nanoclusters

“…Chemical reductive synthesis is a common method to prepare metal nanomaterials which usually yields nanoparticles of large size [56][57][58]. Therefore, it is important to choose a suitable protector or stabilizer to prevent nanoclusters from aggregation.…”