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Au329–xAgx(SR)84 Nanomolecules: Plasmonic Alloy Faradaurate-329

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [3];  [1]
  1. Univ. of Mississippi, Oxford, MS (United States). Department of Chemistry and Biochemistry
  2. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division, Advanced Photon Source
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Though significant progress has been made to improve the monodispersity of larger (>10 nm) alloy metal nanoparticles, there still exists a significant variation in nanoparticle composition, ranging from ±1000s of atoms. Here in this paper, for the first time, we report the synthesis of atomically precise (±0 metal atom variation) Au329–xAgx(SCH2CH2Ph)84 alloy nanomolecules. The composition was determined using high resolution electrospray ionization mass spectrometry. In contrast to larger (>10 nm) Au–Ag nanoparticles, the surface plasmon resonance (SPR) peak does not show a major shift, but a minor ~10 nm red-shift, upon increasing silver content. The intensity of the SPR peak also varies in an intriguing manner, where a dampening is observed with medium silver incorporation, and a significant sharpening is observed upon higher Ag content. The report outlines (a) an unprecedented advance in nanoparticle mass spectrometry of high mass at atomic precision; and (b) the unexpected optical behavior of Au–Ag alloys in the region where nascent SPR emerges; specifically, in this work, the SPR-like peak does not show a major ~100 nm blue-shift with Ag alloying of Au329 nanomolecules, as shown to be common in larger nanoparticles.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725
OSTI ID:
1356950
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 16 Vol. 6; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (43)

Nanocrystal gold molecules journal May 1996
Exploitation of Localized Surface Plasmon Resonance journal October 2004
Synthesis of Au(Core)/Ag(Shell) Nanoparticles and their Conversion to AuAg Alloy Nanoparticles journal December 2010
Restoring Low Resolution Structure of Biological Macromolecules from Solution Scattering Using Simulated Annealing journal June 1999
Size Exclusion Chromatography for Semipreparative Scale Separation of Au 38 (SR) 24 and Au 40 (SR) 24 and Larger Clusters journal July 2011
Au 329 (SR) 84 Nanomolecules: Compositional Assignment of the 76.3 kDa Plasmonic Faradaurates journal April 2014
X-ray Crystal Structure of Au 38– x Ag x (SCH 2 CH 2 Ph) 24 Alloy Nanomolecules journal March 2015
Quantum Sized Gold Nanoclusters with Atomic Precision journal June 2012
Atomically Precise Gold Nanoclusters as New Model Catalysts journal March 2013
Nonscalable Oxidation Catalysis of Gold Clusters journal December 2013
Chirality in Thiolate-Protected Gold Clusters journal February 2014
Noble Metals on the Nanoscale: Optical and Photothermal Properties and Some Applications in Imaging, Sensing, Biology, and Medicine journal December 2008
Nanoalloys:  From Theory to Applications of Alloy Clusters and Nanoparticles journal March 2008
Nanoelectrochemistry: Metal Nanoparticles, Nanoelectrodes, and Nanopores journal July 2008
Synthesis and Optical Properties of Hybrid and Alloy Plasmonic Nanoparticles journal June 2011
Poly(ethylene glycol) Ligands for High-Resolution Nanoparticle Mass Spectrometry journal May 2007
Faradaurate Nanomolecules: A Superstable Plasmonic 76.3 kDa Cluster journal December 2011
Monoplatinum Doping of Gold Nanoclusters and Catalytic Application journal September 2012
Super-Stable, Highly Monodisperse Plasmonic Faradaurate-500 Nanocrystals with 500 Gold Atoms: Au ∼500 (SR) ∼120 journal May 2014
Nanoparticle MALDI-TOF Mass Spectrometry without Fragmentation: Au 25 (SCH 2 CH 2 Ph) 18 and Mixed Monolayer Au 25 (SCH 2 CH 2 Ph) 18− x (L) x journal May 2008
Ubiquitous 8 and 29 kDa Gold:Alkanethiolate Cluster Compounds: Mass-Spectrometric Determination of Molecular Formulas and Structural Implications journal July 2008
Crystal Structure of the Gold Nanoparticle [N(C 8 H 17 ) 4 ][Au 25 (SCH 2 CH 2 Ph) 18 ] journal March 2008
Optical Properties of Au Nanoclusters from TD-DFT Calculations journal March 2011
Atomic Structure of Au 329 (SR) 84 Faradaurate Plasmonic Nanomolecules journal January 2015
From Discrete Electronic States to Plasmons: TDDFT Optical Absorption Properties of Ag n ( n = 10, 20, 35, 56, 84, 120) Tetrahedral Clusters journal July 2008
Optical Absorption Spectra of Nanocrystal Gold Molecules journal May 1997
Alloy Formation of Gold−Silver Nanoparticles and the Dependence of the Plasmon Absorption on Their Composition journal May 1999
Controlled Etching of Au:SR Cluster Compounds journal November 1999
Electronic Structure and Bonding of Icosahedral Core–Shell Gold–Silver Nanoalloy Clusters Au 144– x Ag x (SR) 60 journal August 2011
Effect of Copper Doping on Electronic Structure, Geometric Structure, and Stability of Thiolate-Protected Au 25 Nanoclusters journal August 2012
X-ray Crystal Structure and Theoretical Analysis of Au 25– x Ag x (SCH 2 CH 2 Ph) 18 Alloy journal January 2014
Birth of the Localized Surface Plasmon Resonance in Monolayer-Protected Gold Nanoclusters journal October 2013
Faradaurate-940: Synthesis, Mass Spectrometry, Electron Microscopy, High-Energy X-ray Diffraction, and X-ray Scattering Study of Au ∼940±20 (SR) ∼160±4 Nanocrystals journal May 2014
Information on quantum states pervades the visible spectrum of the ubiquitous Au144(SR)60 gold nanocluster journal April 2014
Quantum sized, thiolate-protected gold nanoclusters journal January 2010
Isolation, structure, and stability of a dodecanethiolate-protected Pd1Au24 cluster journal January 2010
Continuous modulation of electronic structure of stable thiolate-protected Au25 cluster by Ag doping journal January 2010
(AuAg)144(SR)60 alloy nanomolecules journal January 2011
AuAg alloy nanomolecules with 38 metal atoms journal January 2012
Toward the creation of stable, functionalized metal clusters journal January 2013
A unified view of ligand-protected gold clusters as superatom complexes journal July 2008
Determination of the regularization parameter in indirect-transform methods using perceptual criteria journal August 1992
Structure of a Thiol Monolayer-Protected Gold Nanoparticle at 1.1 A Resolution journal October 2007

Cited By (3)

Revealing isoelectronic size conversion dynamics of metal nanoclusters by a noncrystallization approach journal May 2018
The solely motif-doped Au 36−x Ag x (SPh-tBu) 24 (x = 1–8) nanoclusters: X-ray crystal structure and optical properties journal January 2016
Polylysine-grafted Au 144 nanoclusters: birth and growth of a healthy surface-plasmon-resonance-like band journal January 2017

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