Revealing the composition-dependent structural evolution fundamentals of bimetallic nanoparticles through an inter-particle alloying reaction

Abstract

Alloy nanoparticles represent one of the most important metal materials, finding increasing applications in diverse fields of catalysis, biomedicine, and nano-optics. However, the structure evolution of bimetallic nanoparticles in their...

Recent developments in the investigation of driving forces for transforming coinage metal nanoclusters

“…In 2022, Xie and coworkers reported an intercluster reaction between two nanoclusters possessing the same number of metal atoms but different geometric frameworks, i.e., [Au 44 (SR) 26 ] 2À and [Ag 44 (SR) 30 ] 4À . 301 Specifically, they used three representative feed ratios of R Au 44 /Ag 44 = 1/3, 3/1, and 6/1 to probe the details, and these processes were tracked and analyzed with real-time UV-vis spectroscopy and ESI-MS. The product underwent a transformation from Ag-rich [Au x Ag 44Àx -(SR) 30 ] 4À (x = 1-12) to evenly mixed [Au x Ag 44Àx (SR) 27 ] 3À (x = 19-24) and further to Au-rich [Au x Ag 44Àx (SR) 26 ] 2À (x = 40-43) nanoclusters as the molar ratio was increased gradually.…”

Electron transport through supercrystals of atomically precise gold nanoclusters: a thermal bi-stability effect

“…8,9 It has long been a major dream to obtain atomically precise NPs and assemble them into atomically coherent superlattices for achieving versatile functionalities. 5,6,10 Recent advances in nanochemistry [11][12][13][14][15][16][17] have offered access to gold NPs with atomically precise cores and denitive numbers of surface ligands (e.g., thiolate -SR or phosphine PPh 3 ), 10,16,17 which are represented by exact formulae (e.g., Au n (SR) m for thiolate-protected NPs), akin to molecules. [18][19][20][21] Such ultrasmall NPs (1-3 nm core diameter) are oen called nanoclusters (NCs).…”

(AuAg)44(SPhtBu)26 versus (AuAg)44(SPhF2)30: Tailoring the Geometric Structures and Optical Properties of Nanocluster Analogues

“…The development of correlated nanocluster analogues with comparable structures in atomic precision was the most direct route to compare the structural effects on their properties. − For instance, numerous studies have revealed the regulation of optical absorption, fluorescence, magnetism, and electrochemistry of the correlated M 25 nanoclusters by controlling their structures/compositions. − A series of correlated structures were reported on the basis of the M 29 nanoclusters system, and some in-depth insights have been revealed by relating their structures and properties. − In truth, the obtained structure–property correlations can further guide the researchers to fabricate cluster-based functionalized nanomaterials more rationally. − The development of new nanocluster analogues with comparable structural features calls for more effort.…”

“…Herein, we reported one 18-electron Au 24+ x Ag 20– x (SPh t Bu) 26 ( Au 24+ x Ag 20– x for short, 0 < x < 4; SPh t Bu = p - tert -butylphenol) superatom nanocluster with an identical size and comparable structural features to a well-known nanocluster, [Au 12 Ag 32 (SPhF 2 ) 30 ] 4– ( Au 12 Ag 32 for short; SPhF 2 = 3,4-difluorothiophenol). , The single-crystal X-ray diffraction (SC-XRD) showed that Au 24+ x Ag 20– x contained a uniform hollow Au 12 core and a distorted M 20 (M = Au/Ag) cage, which was further stabilized by 12 Au 1 (SR) 2 staplelike motifs and two SR molecules. By comparison, the Au 12 Ag 32 nanocluster was composed of a concentric Au 12 @Ag 20 kernel and six identical Ag 2 (SR) 5 surface motifs.…”