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

Kumara, Chanaka; Zuo, Xiaobing; Cullen, David A.; Dass, Amala

doi:10.1021/acs.jpclett.5b01395

Title: Au_329–xAg_x(SR)₈₄ Nanomolecules: Plasmonic Alloy Faradaurate-329

Journal Article · Mon Aug 10 00:00:00 EDT 2015 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.5b01395· OSTI ID:1356950

Kumara, Chanaka ^[1]; Zuo, Xiaobing ^[2]; Cullen, David A. ^[3]; Dass, Amala ^[1]

Univ. of Mississippi, Oxford, MS (United States). Department of Chemistry and Biochemistry
Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division, Advanced Photon Source
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) Au_329–xAg_x(SCH₂CH₂Ph)_{84 alloy nanomolecules. The composition was determined using high resolution electrospray ionization mass sp}ectrometry. 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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 1356950

Journal Information:: Journal of Physical Chemistry Letters, Vol. 6, Issue 16; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: Au_329–xAg_x(SR)₈₄ Nanomolecules: Plasmonic Alloy Faradaurate-329