Au144−xCux(SC6H13)60 nanomolecules: effect of Cu incorporation on composition and plasmon-like peak emergence in optical spectra

Dharmaratne, Asantha C.; Dass, Amala

doi:10.1039/c3cc47060a

Cited by 68 publications

(75 citation statements)

References 38 publications

(42 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The product gold-hexanethiolate clusters were then extracted from the precipitated material into dichloromethane solution. The as-obtained material contains Au 144 (SR) 60 as a major product, R ¼ C 6 H 13 , but also smaller quantities of lower-mass clusters (Au 25 (SR) 18 , Au 67 (SR) 35 and Au 102 (SR) 44 ) as well as larger ones in the 70-kDa mass range. Smaller clusters were removed from powder samples by extraction into acetone.…”

Section: Methodsmentioning

confidence: 99%

Information on quantum states pervades the visible spectrum of the ubiquitous Au144(SR)60 gold nanocluster

et al. 2014

View full text Add to dashboard Cite

Absorption spectra of very small metal clusters exhibit individual peaks that reflect the discreteness of their localized electronic states. With increasing size, these states develop into bands and the discrete absorption peaks give way to smooth spectra with, at most, a broad localized surface-plasmon resonance band. The widely accepted view over the last decades has been that clusters of more than a few dozen atoms are large enough to have necessarily smooth spectra. Here we show through theory and experiment that for the ubiquitous thiolate cluster compound Au 144 (SR) 60 this view has to be revised: clearly visible individual peaks pervade the full near-IR, VIS and near-UV ranges of low-temperature spectra, conveying information on quantum states in the cluster. The peaks develop well reproducibly with decreasing temperature, thereby highlighting the importance of temperature effects. Calculations using time-dependent density-functional theory indicate the contributions of different parts of the cluster-ligand compound to the spectra.

show abstract

Section: Methodsmentioning

confidence: 99%

Information on quantum states pervades the visible spectrum of the ubiquitous Au144(SR)60 gold nanocluster

et al. 2014

View full text Add to dashboard Cite

show abstract

“…165 , which however has not been validated so far by X-ray crystal measurements. Later reports in the Dass group extended this line of investigation to substitution by copper: (AuCu)144(SR)60 166 , and palladium: (AuPd)144(SR)60 167 .…”

Section: Au130 and Au144mentioning

confidence: 97%

Optical properties of nanoalloys

Barcaro

Sementa

Fortunelli

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The optical properties of multi-component metal nanostructures (or nanoalloys) are the subject of an intense and rapidly growing experimental and theoretical activity. In this perspective article, we first provide a survey of the most recent developments in the field, concerning both theoretical methods, especially at the first-principles level, and novel results, distinguishing for the convenience of presentation the sub-field of monolayer-protected multi-component metal clusters from the other alloy nanosystems. We then discuss a few general concepts which can be drawn from this survey, and offer a few suggestions on the most promising directions for future research. We hope that making the point in this fast developing field will provide a framework and a perspective useful to trigger future studies and advancements.

show abstract

“…Another Au‐Cu NC species was recently synthesized within the M 144 system by Dharmaratne et al Similar to the synthesis of Au 144‐x Ag x NCs, they applied one‐phase Brust method and prepared a series of Au 144‐x Cu x (SC 6 H 13 ) 60 NCs by reducing Au 3+ and Cu 2+ ions in ethanol and in the presence of HSC 6 H 13 . As shown in Figure a‐b, the number of doped Cu atoms can be tuned by changing the feeding ratios of HAuCl 4 /CuCl 2 from 1:0 to 1:0.5, and up to 23 Cu atoms can be incorporated into the M 144 NCs.…”

Section: Synthesis Of Monodisperse And/or Luminescent Bi‐mncsmentioning

confidence: 99%

Section: Synthesis Of Monodisperse And/or Luminescent Bi‐mncsmentioning

confidence: 99%

“…[ 111 ] More recently, Gottlieb et al observed a spontaneous de-alloying process in which the initially formed Au 25-x Cu x (SC 2 H 4 Ph) 18 NCs were converted to Au 25 (SC 2 H 4 Ph) 18 NCs after a certain period of incubation, suggesting the relatively lower stability of Au-Cu NCs in solution compared to Au NCs. [ 36 ] Another Au-Cu NC species was recently synthesized within the M 144 system by Dharmaratne et al [ 112 ] Similar to the synthesis of Au 144-x Ag x NCs, they applied one-phase Brust method and prepared a series of Au 144-x Cu x (SC 6 H 13 ) 60 NCs by reducing Au 3+ and Cu 2+ ions in ethanol and in the presence of HSC 6 H 13 . As shown in Figure 6 a-b, the number of doped Cu atoms can be tuned by changing the feeding ratios of HAuCl 4 /CuCl 2 from 1:0 to 1:0.5, and up to 23 Cu atoms can be incorporated into the M 144 NCs.…”

Section: Au-cu Ncsmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in the Synthesis and Applications of Ultrasmall Bimetallic Nanoclusters

Yuan

Dou

Zheng

et al. 2015

Part & Part Syst Charact

105

View full text Add to dashboard Cite

1wileyonlinelibrary.com www.particle-journal.com www.MaterialsViews.com REVIEWUltrasmall bimetallic nanoclusters (or bi-MNCs for short) have recently emerged as a new class of multi-functional nanoparticles due to their ultrasmall size (typically below 2 nm), unique molecular-like properties (e.g., quantized charging and strong luminescence), controlled cluster compositions (at the atomic level), synergistic physicochemical properties, and rich surface chemistry. Such intriguing properties have motivated the cluster community to develop effi cient methods for the synthesis of high-quality bi-MNCs, which can also be seen from the quantum increase of reported synthetic protocols for bi-MNCs. Recent advances in the development of effi cient synthesis methods for high-quality bi-MNCs also facilitate the application explorations of bi-MNCs in diverse fi elds like catalysis, sensors, and biomedicine. This Review article fi rst surveys current progress in the synthesis of bi-MNCs, especially for those NCs with good control of cluster size and composition, followed by a detailed discussion on some unique physicochemical properties of bi-MNCs. The intriguing properties of bi-MNCs have made them ideal platforms for application explorations in catalysis, sensors, and biomedicine, which are discussed in the second section. In the last section, a brief outlook on future developments of functional bi-MNCs is presented, with a particular focus on the controlled synthesis and practical applications of bi-MNCs. IntroductionNoble metal nanoclusters (MNCs), such as Au and Ag NCs, typically comprising of a hundred metal atoms or less, are a subclass of metal nanoparticles (MNPs). [ 1,2 ] MNCs contain a small metal core with sizes below 2 nm and an organic ligand shell. [3][4][5] Particles in this sub-2-nm size region show characteristic quantum confi nement effects, which leads to their discrete and size-dependent electronic transitions. Sub-2-nm MNCs also feature with unique geometric cluster structures. These properties are distinctively different from their larger counterparts-MNPs with core sizes above 2 nm. For example, MNPs show quasi-continuous electronic states and typically adopt a face centered cubic ( fcc) atomic packing. [ 2,6 ] as magnetism, [ 7,8 ] HOMO-LUMO transitions, [9][10][11] quantized charging, [ 10,12 ] and strong luminescence. [13][14][15][16] Such intriguing physicochemical properties have made MNCs good platforms to address some key challenges in the fi elds of catalysis, energy conversion, drug delivery, sensor development, biomedicine, and nanophotonics. [17][18][19][20][21][22][23][24][25][26][27][28][29] The diverse yet promising applications of MNCs have also motivated rapid progress in the development of functional MNCs. [30][31][32][33] In the wake of extensive development of mono-metallic NCs (mono-MNCs for short), more recently, the cluster community has begun to investigate functional NCs comprising of two or more metal species, and such bi-or multi-metallic NCs (bi-or multi-MNCs for short) have ...

show abstract

Au144−xCux(SC6H13)60 nanomolecules: effect of Cu incorporation on composition and plasmon-like peak emergence in optical spectra

Cited by 68 publications

References 38 publications

Information on quantum states pervades the visible spectrum of the ubiquitous Au144(SR)60 gold nanocluster

Information on quantum states pervades the visible spectrum of the ubiquitous Au144(SR)60 gold nanocluster

Optical properties of nanoalloys

Recent Advances in the Synthesis and Applications of Ultrasmall Bimetallic Nanoclusters

Contact Info

Product

Resources

About