2013
DOI: 10.1021/jz400332g
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New Protocols for the Synthesis of Stable Ag and Au Nanocluster Molecules

Abstract: "Catching" metals in the nonmetallic form in solution, as they grow to bulk, is one of the most exciting areas of contemporary materials research. A new kind of stabilization to catch the nonmetallic form of noble metals with small thiols has evolved as an exciting area of synthesis during the past decade. Gold clusters stay in the frontline of this research, yielding new "molecules" composed of a few to several hundreds of atoms. By taking guidelines from gold cluster research, various new protocols for silve… Show more

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Cited by 198 publications
(191 citation statements)
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“…Using theoretical calculations, Häkkinen et al predicted that with Pd doping, a coreshell Pd@Au 24 (SR) 18 structure in which the central Au atom in the Au 13 core is replaced with Pd would be most energetically stable. 83 To verify this structure, we measured the optical absorption spectrum and X-ray powder diffraction (XRD) pattern of [Pd@Au 24 (Figure 3a), which concluded that [Pd@Au 24 (SC 12 H 25 ) 18 ] 0 has this type of structure. 85 Very recently, Tsukuda et al reported a similar conclusion based on Mössbauer spectroscopy and extended X-ray absorption fine structure (EXAFS) analysis.…”
Section: Chemical Compositionmentioning
confidence: 92%
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“…Using theoretical calculations, Häkkinen et al predicted that with Pd doping, a coreshell Pd@Au 24 (SR) 18 structure in which the central Au atom in the Au 13 core is replaced with Pd would be most energetically stable. 83 To verify this structure, we measured the optical absorption spectrum and X-ray powder diffraction (XRD) pattern of [Pd@Au 24 (Figure 3a), which concluded that [Pd@Au 24 (SC 12 H 25 ) 18 ] 0 has this type of structure. 85 Very recently, Tsukuda et al reported a similar conclusion based on Mössbauer spectroscopy and extended X-ray absorption fine structure (EXAFS) analysis.…”
Section: Chemical Compositionmentioning
confidence: 92%
“…The resulting mixture was dried, followed by separation of only Au 25¹n Cu n (SR) 18 using size-related differences in the cluster solubilities (acetonitrile and acetone were used as solvents for the extraction of Au 25¹n Cu n -(SC 2 H 4 Ph) 18 and Au 25¹n Cu n (SC 8 H 17 ) 18 , respectively). 87 Figure 2a shows the matrixassisted laser desorption/ionization (MALDI) mass spectrum of Au 24 85 In contrast, the Au 25 (SR) 18 cluster has been reported to form the negative ion [Au 25 (SR) 18 ] ¹ . 53,56,57 High-resolution separation of these two species by HPLC using a reverse-phase column was successful because of the different charge states of the two clusters.…”
Section: Determining Heteroatom Doping Effectsmentioning
confidence: 99%
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“…[11][12][13] The emerging opportunities in catalysis, 14 energy, 15,16 environment, 17 and biology 18 enabled by the small size and often precise nature of these materials has spurred researchers to explore a multitude of synthetic routes to attain them including borohydride and gaseous reduction; 19,20 26 ; and templated growth in proteins, 27 polymers, 24 and gel cavities. 26 Each of these methods produces size-specific NCs.…”
Section: Introductionmentioning
confidence: 99%