Dynamic final-state effect on the Au<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mi>f</mml:mi></mml:math>core-level photoemission of dodecanethiolate-passivated Au nanoparticles on graphite substrates

Tanaka, Akinori; Takeda, Yuitsu; Imamura, Masaki; Satō, Shigeru

doi:10.1103/physrevb.68.195415

Cited by 71 publications

(76 citation statements)

References 12 publications

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“…[13] From the detailed peak shape analysis, Tanaka and co-workers have found that the Au 4f core-level spectra consist of two components, which are the inner Au atoms and surface Au atoms bonded to surface thiolates. [15] The AuA C H T U N G T R E N N U N G (4f 7/2 ) peak positions of the surface Au components have been located at a higher binding energy than the corresponding inner components. Most of the Au atoms are located on the surface of clusters.…”

Section: à3mentioning

confidence: 98%

Blue Luminescence Emitted from Monodisperse Thiolate‐Capped Au₁₁ Clusters

2009

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Gold clusters (Au n , n = the number of gold atoms in the core) containing less than 200 down to a few atoms have gained great attention in the last decade. [1][2][3][4][5][6][7][8] Because only a few gold atoms are contained in the clusters, the size of the clusters approaches the de Broglie wavelength of the conduction electrons. The density of states is insufficient to merge the valence and conduction bands, which allows discrete cluster energy levels to become possible. As a result, gold clusters are likely to behave as "artificial atoms", showing photoluminescence. The quantum yields (QYs) of the clusters are enhanced by several orders of magnitude compared to that of the bulk gold (QY = 10 À10 ), [9] which gives gold clusters potential applications in sensors and labeling.Organothiolate-monolayer-protected gold products exhibit superb stability against air, long-term storage and concentration extremes. [10,11] Due to their extraordinary stability, the fluorescence emission of thiolate-capped Au clusters, especially prepared via modified Brust methods, has been a focus of intensive research. Au 145 clusters surrounded by a passivating layer of dodecanethiol molecules showed luminescence and a quantum yield of (4.4 AE 1.5) 10 À5 .[12] Photoemission from gold clusters (10-39 Au atoms) protected by glutathione were reported, and the emission efficiencies were in the range of 1 10 À4 to 4 10 À3 .[13] Visible luminescence was emitted from gold clusters with 1.8 nm diameter cores and protected by a monolayer of tiopronin thiolate, with a QY of 0.3 % for 451 nm excitation. [14] These elegant studies have undoubtedly opened up many exciting potential applications for the gold clusters. However, these thiolate-protected gold clusters suffer from low QYs, which have become a major obstacle in practical applications.In general, alkyl-and arylthiols containing no functional groups are chosen as the ligands to protect fluorescent gold clusters in Brust two-phase methods. Herein, in contrast to the reported fluorescent thiolate-protected gold clusters prepared via Brust two-phase procedure, we chose carboxylic-acid-terminated thiolated molecules, 3-mercaptopropionic acid (MPA), as the stabilizing agents, and successfully synthesized Au 11 clusters. Clear blue luminescence was observed from the clusters, and fluorescence quantum yield was 8.6 %. [13] From the detailed peak shape analysis, Tanaka and co-workers have found that the Au 4f core-level spectra consist of two components, which are the inner Au atoms and surface Au atoms bonded to surface thiolates.[15] The AuA C H T U N G T R E N N U N G (4f 7/2 ) peak positions of the surface Au components have been located at a higher binding energy than the corresponding inner components. Most of the Au atoms are located on the surface of clusters. Furthermore, the Au atoms in the clusters donate 5d electrons to the thiolates when capped with strongly interacting thiol molecules.[16] These two factors lead to the AuA C H T U N G T R E N N U N G (4f 7/2 ) binding energies of go...

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Section: à3mentioning

confidence: 98%

Blue Luminescence Emitted from Monodisperse Thiolate‐Capped Au₁₁ Clusters

2009

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“…[30][31][32] A detailed peak-shape analysis of thiolate-passivated Au nanoparticles carried out by Tanaka and co-workers showed that Au(4f 7/2 ) peaks are indeed composed of two components, one with lower binding energy originating from inner Au atoms and the other with relatively high binding energy arising from surface Au atoms linked to thiol molecules. 30 The 4f 7/2 binding energy of the surface Au atoms is generally higher in energy, since electron donation from surface Au atoms to the thiolate ligand occurs (initial-state effect). In the present study, the Au(4f 7/2 ) core level binding energy in the cluster is slightly higher than the Au(4f 7/2 ) binding energy value in an Au(0) film.…”

Section: Synthesis Of Bare Auncmentioning

confidence: 99%

A facile one-pot synthesis of blue and red luminescent thiol stabilized gold nanoclusters: a thorough optical and microscopy study

Pal

Kryschi

2015

Phys. Chem. Chem. Phys.

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Here in this contribution, blue and red luminescent 1-dodecanethiol (DT) terminated gold nanoclusters (AuNC) were prepared by a simple two-step synthesis route where the first step involved the surfactantfree synthesis of bare AuNC in N,N 0 -dimethylformamide (DMF) and the second step is the termination of the as-prepared bare AuNC by 1-dodecanethiol. The blue and red luminescent DT-terminated AuNC were isolated by a solvent-induced precipitation followed by an ultra-centrifugation technique. Both the bare AuNC and the blue and red luminescent DT-terminated AuNC exhibit stable photoluminescence and good solubility in various solvents. The photo-physical, electronic, structural, and morphological properties of the bare AuNC and the blue and red luminescent DT-terminated AuNC were examined by performing UV-Vis absorption spectroscopy, stationary and time-resolved PL spectroscopy, X-ray photoelectron spectroscopy (XPS), femtosecond transient absorption spectroscopy, Fourier-transform infrared spectroscopy (FTIR-ATR), and high-resolution transmission electron microscopy (HRTEM) experiments.

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“…Tanaka and coworkers found from detailed peak shape analysis that the Au (4f7/2) peaks can be deconvoluted into two components associated with the inner and surface atoms of gold. 32 The Au (4f7/2) peak positions for the inner Au atoms were found to monotonically shift from 84.0 to 84.3 eV with a reduction of the core size. The Au (4f7/2) peak positions of the surface Au components were at higher energy (84.3 -84.7 eV) than those of the corresponding inner components.…”

Section: Trypsin-stabilized Fluorescence Au Ncs With a Red Emissionmentioning

confidence: 99%

“…One contribution is that the higher binding energy (85.5 eV) of trypsin-stabilized Au 4f2/7 can be attributed to the surface Au components with higher energy. 32 Another contribution is that the higher binding energy originated from Au-S bonds in trypsin-stabilized Au NCs. 33 To check whether or not any conformational changes occurred in the trypsin of Au NCs, CD spectroscopy was performed for trypsin-stabilized Au NCs and pure trypsin.…”

Section: Trypsin-stabilized Fluorescence Au Ncs With a Red Emissionmentioning

confidence: 99%

Trypsin-Stabilized Fluorescent Gold Nanocluster for Sensitive and Selective Hg2+ Detection

et al. 2011

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We report on trypsin-stabilized fluorescent gold nanoclusters (Au NCs) for the sensitive and selective detection of Hg 2+ ions. The Au NCs have an average size of 1 nm and show a red emission at 645 nm. The photostable properties of the trypsin-stabilized Au NCs were examined, and their photochemical stability was found to be similar to that of CdSe quantum dots. The fluorescence was particularly quenched by Hg 2+ , and therefore the Au NCs can be used as fluorescent sensors for sensitive and selective Hg 2+ detection to a detection limit of 50 ± 10 nM and the quantitative detection of Hg 2+ in wide and low concentration range of 50 -600 nM.

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Dynamic final-state effect on the Au4fcore-level photoemission of dodecanethiolate-passivated Au nanoparticles on graphite substrates

Cited by 71 publications

References 12 publications

Blue Luminescence Emitted from Monodisperse Thiolate‐Capped Au₁₁ Clusters

Blue Luminescence Emitted from Monodisperse Thiolate‐Capped Au₁₁ Clusters

A facile one-pot synthesis of blue and red luminescent thiol stabilized gold nanoclusters: a thorough optical and microscopy study

Trypsin-Stabilized Fluorescent Gold Nanocluster for Sensitive and Selective Hg2+ Detection

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Dynamic final-state effect on the Au4fcore-level photoemission of dodecanethiolate-passivated Au nanoparticles on graphite substrates

Cited by 71 publications

References 12 publications

Blue Luminescence Emitted from Monodisperse Thiolate‐Capped Au11 Clusters

Blue Luminescence Emitted from Monodisperse Thiolate‐Capped Au11 Clusters

A facile one-pot synthesis of blue and red luminescent thiol stabilized gold nanoclusters: a thorough optical and microscopy study

Trypsin-Stabilized Fluorescent Gold Nanocluster for Sensitive and Selective Hg2+ Detection

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Blue Luminescence Emitted from Monodisperse Thiolate‐Capped Au₁₁ Clusters

Blue Luminescence Emitted from Monodisperse Thiolate‐Capped Au₁₁ Clusters