Understanding Au∼98Ag∼46(SR)60 nanoclusters through investigation of their electronic and local structure by X-ray absorption fine structure

Jing Liu; Katla Sai Krishna; Chanaka Kumara; Soma Chattopadhyay; Tomohiro Shibata; Amala Dass; Challa S.S.R. Kumar

doi:10.1039/c5ra27396j

Understanding Au_∼98Ag_∼46(SR)₆₀ nanoclusters through investigation of their electronic and local structure by X-ray absorption fine structure

Jing Liu, Katla Sai Krishna, Chanaka Kumara, Soma Chattopadhyay, Tomohiro Shibata, Amala Dass, Challa S.S.R. Kumar

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Abstract

Here we report the electronic and local atomic structure of thiol-stabilized Au_∼98Ag_∼46(SR)₆₀ nanoclusters investigated by synchrotron radiation-based X-ray absorption fine structure (XAFS). Au L₃-edge X-ray absorption near edge fine structure (XANES) was used to examine the d band character of Au, which is highly related to the electronic, magnetic and catalytic activities of Au. It was observed that the d band hole population of Au in Au_∼98Ag_∼46(SR)₆₀ was higher than that of bulk Au. The formation of the AuAg alloy was confirmed by extended X-ray absorption fine structure (EXAFS). The EXAFS results also suggested that Au atoms in Au_∼98Ag_∼46(SR)₆₀ nanoclusters preferred to occupy the metal core sites, while the Ag atoms were mainly on the surface.

Original language	English
Pages (from-to)	25368-25374
Number of pages	7
Journal	RSC Advances
Volume	6
Issue number	30
DOIs	https://doi.org/10.1039/c5ra27396j
State	Published - 2016
Externally published	Yes

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title = "Understanding Au∼98Ag∼46(SR)60 nanoclusters through investigation of their electronic and local structure by X-ray absorption fine structure",

abstract = "Here we report the electronic and local atomic structure of thiol-stabilized Au∼98Ag∼46(SR)60 nanoclusters investigated by synchrotron radiation-based X-ray absorption fine structure (XAFS). Au L3-edge X-ray absorption near edge fine structure (XANES) was used to examine the d band character of Au, which is highly related to the electronic, magnetic and catalytic activities of Au. It was observed that the d band hole population of Au in Au∼98Ag∼46(SR)60 was higher than that of bulk Au. The formation of the AuAg alloy was confirmed by extended X-ray absorption fine structure (EXAFS). The EXAFS results also suggested that Au atoms in Au∼98Ag∼46(SR)60 nanoclusters preferred to occupy the metal core sites, while the Ag atoms were mainly on the surface.",

author = "Jing Liu and Krishna, \{Katla Sai\} and Chanaka Kumara and Soma Chattopadhyay and Tomohiro Shibata and Amala Dass and Kumar, \{Challa S.S.R.\}",

note = "Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2016.",

year = "2016",

doi = "10.1039/c5ra27396j",

language = "English",

volume = "6",

pages = "25368--25374",

journal = "RSC Advances",

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T1 - Understanding Au∼98Ag∼46(SR)60 nanoclusters through investigation of their electronic and local structure by X-ray absorption fine structure

AU - Liu, Jing

AU - Krishna, Katla Sai

AU - Kumara, Chanaka

AU - Chattopadhyay, Soma

AU - Shibata, Tomohiro

AU - Dass, Amala

AU - Kumar, Challa S.S.R.

PY - 2016

Y1 - 2016

N2 - Here we report the electronic and local atomic structure of thiol-stabilized Au∼98Ag∼46(SR)60 nanoclusters investigated by synchrotron radiation-based X-ray absorption fine structure (XAFS). Au L3-edge X-ray absorption near edge fine structure (XANES) was used to examine the d band character of Au, which is highly related to the electronic, magnetic and catalytic activities of Au. It was observed that the d band hole population of Au in Au∼98Ag∼46(SR)60 was higher than that of bulk Au. The formation of the AuAg alloy was confirmed by extended X-ray absorption fine structure (EXAFS). The EXAFS results also suggested that Au atoms in Au∼98Ag∼46(SR)60 nanoclusters preferred to occupy the metal core sites, while the Ag atoms were mainly on the surface.

AB - Here we report the electronic and local atomic structure of thiol-stabilized Au∼98Ag∼46(SR)60 nanoclusters investigated by synchrotron radiation-based X-ray absorption fine structure (XAFS). Au L3-edge X-ray absorption near edge fine structure (XANES) was used to examine the d band character of Au, which is highly related to the electronic, magnetic and catalytic activities of Au. It was observed that the d band hole population of Au in Au∼98Ag∼46(SR)60 was higher than that of bulk Au. The formation of the AuAg alloy was confirmed by extended X-ray absorption fine structure (EXAFS). The EXAFS results also suggested that Au atoms in Au∼98Ag∼46(SR)60 nanoclusters preferred to occupy the metal core sites, while the Ag atoms were mainly on the surface.

UR - https://www.scopus.com/pages/publications/84960871764

U2 - 10.1039/c5ra27396j

DO - 10.1039/c5ra27396j

M3 - Article

AN - SCOPUS:84960871764

SN - 2046-2069

VL - 6

SP - 25368

EP - 25374

JO - RSC Advances

JF - RSC Advances

IS - 30

ER -

Understanding Au_∼98Ag_∼46(SR)₆₀ nanoclusters through investigation of their electronic and local structure by X-ray absorption fine structure

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