Noble metal alloy clusters in the gas phase derived from protein templates: unusual recognition of palladium by gold

Baksi, Ananya; Pradeep, Thalappil

doi:10.1039/c3nr04257j

Cited by 15 publications

(23 citation statements)

References 54 publications

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“…The overall surface structure of the protein shows nearly spherical geometry with mean diameter (considering three-dimensional orientation) of about 3.9 nm. 45,47 We have studied the formation and growth of gold clusters using SAXS, and the data were compared with mass spectrometric evolution of the clusters within the protein. It is known from a previous study that when protein interacts with Au…”

Section: Resultsmentioning

confidence: 99%

“…Thus, considering the above observations, we have used the sphere model in the subsequent analyses. 45,47 3.3. Evolution of Gold Cluster in Lyz.…”

Section: +mentioning

confidence: 99%

“…Therefore, for assigning cluster composition, mass spectrometry (MS) is often used, as it is possible to determine molecular weights of proteins and related systems with reasonable accuracy. For instance, Au/Ag/Au@Ag QC @BSA, 28,32,34,46 Au/Ag QC @Lyz, 24,47 Au QC @Lf, 36,37 etc. (where the subscript QC refers to quantum clusters, another name for such clusters) have been studied using MS.…”

Section: Introductionmentioning

confidence: 99%

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Size Evolution of Protein-Protected Gold Clusters in Solution: A Combined SAXS–MS Investigation

et al. 2015

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ABSTRACT:We report a combined small-angle X-ray scattering (SAXS) and mass spectrometric (MS) study of the growth of gold clusters within proteins, in the solution state. Two different proteins, namely, lysozyme (Lyz) and bovine serum albumin (BSA), were used for this study. SAXS study of clusters grown in Lyz shows the presence of a 0.8 nm gold core, which is in agreement with the Au 10 cluster observed in MS. Dynamic light scattering suggests the size of the cluster core to be 1.2 nm. For BSA, however, a bigger core size was observed, comparable to the Au 33 core obtained in MS. Concentration-and time-dependent data do not show much change in the core size in both SAXS and MS investigations. When metal−protein adducts were incubated for longer time in solution, nanoparticles were formed and protein size decreased, possibly due to the fragmentation of the latter during nanoparticle formation. The data are in agreement with dynamic light scattering studies. This work helps to directly visualize cluster growth within protein templates in solution.

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Section: Resultsmentioning

confidence: 99%

“…Thus, considering the above observations, we have used the sphere model in the subsequent analyses. 45,47 3.3. Evolution of Gold Cluster in Lyz.…”

Section: +mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Size Evolution of Protein-Protected Gold Clusters in Solution: A Combined SAXS–MS Investigation

et al. 2015

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“…It was proposed that the cluster nucleation occurred in the vicinity of the protein, in the gas phase, leading to the formation of magic numbered Au clusters. Later, naked alloy clusters of the type Au 24 Pd + were also detected in the gas phase using a similar approach . A recent perspective article by Rao and Pradeep summarizes advances in the synthesis of atomically precise QCs of silver, gold, and their alloys with special emphasis on silver QCs.…”

Section: Common Synthetic Approachesmentioning

confidence: 99%

Noble Metal Clusters: Applications in Energy, Environment, and Biology

Mathew

Pradeep

2014

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Sub‐nanometer‐sized metal clusters, having dimensions between metal atoms and nanoparticles, have attracted tremendous attention in the recent past due to their unique physical and chemical properties. As properties of such materials depend strongly on size, development of synthetic routes that allows precise tuning of the cluster cores with high monodispersity and purity is an area of intense research. Such materials are also interesting owing to their wide variety of applications. Novel sensing strategies based on these materials are emerging. Owing to their extremely small size, low toxicity, and biocompatibility, they are widely studied for biomedical applications. Primary focus of this review is to provide an account of the recent advances in their applications in areas such as environment, energy, and biology. With further experimental and theoretical advances aimed at understanding their novel properties and solving challenges in their synthesis, an almost unlimited field of applications can be foreseen.

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“…In addition to the thiolate‐protected Au‐Pd NCs in solution, naked Au‐Pd NCs in gas phase and phosphine‐protected Au‐Pd NCs in solution have also been studied extensively in the research community . Moreover, many studies have indicated the excellent catalytic activities of Au‐Pd and Au‐Pt NCs .…”

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

confidence: 99%

Recent Advances in the Synthesis and Applications of Ultrasmall Bimetallic Nanoclusters

Yuan

Dou

Zheng

et al. 2015

Part & Part Syst Charact

108

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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 ...

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Noble metal alloy clusters in the gas phase derived from protein templates: unusual recognition of palladium by gold

Cited by 15 publications

References 54 publications

Size Evolution of Protein-Protected Gold Clusters in Solution: A Combined SAXS–MS Investigation

Size Evolution of Protein-Protected Gold Clusters in Solution: A Combined SAXS–MS Investigation

Noble Metal Clusters: Applications in Energy, Environment, and Biology

Recent Advances in the Synthesis and Applications of Ultrasmall Bimetallic Nanoclusters

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