Enhanced photocatalytic water splitting by BaLa4Ti4O15 loaded with ∼1 nm gold nanoclusters using glutathione-protected Au25 clusters

Negishi, Yuichi; Mizuno, Masahiro; Hirayama, Michiyo; Omatoi, Mamiko; Takayama, Tomoaki; Iwase, Akihide; Kudo, Akihiko

doi:10.1039/c3nr01888a

Cited by 108 publications

(133 citation statements)

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“…[11][12][13] The emerging opportunities in catalysis, 14 energy, 15,16 environment, 17 and biology 18 enabled by the small size and often precise nature of these materials has spurred researchers to explore a multitude of synthetic routes to attain them including borohydride and gaseous reduction; 19,20 26 ; and templated growth in proteins, 27 polymers, 24 and gel cavities. 26 Each of these methods produces size-specific NCs.…”

Section: Introductionmentioning

confidence: 99%

Reversible Size Control of Silver Nanoclusters via Ligand-Exchange

et al. 2015

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The properties of atomically monodisperse noble metal nanoclusters (NCs) are intricately intertwined with their precise molecular formula. The vast majority of size-specific NC syntheses start from the reduction of the metal salt and thiol ligand mixture. Only in gold was it recently shown that ligand-exchange could induce the growth of NCs from one atomically precise species to another; a process of yet unknown reversibility. Here, we present a process for the ligand-exchange-induced growth of atomically precise silver NCs, in a biphasic liquid-liquid system, which is particularly of interest because of its complete reversibility and ability to occur at room temperature. We explore this phenomenon in-depth using Ag 35 (SG) 18

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Section: Introductionmentioning

confidence: 99%

Reversible Size Control of Silver Nanoclusters via Ligand-Exchange

et al. 2015

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“…In the diffuse reflectance spectrum for the calcined photocatalyst, the typical peak structure for Au 25 (SG) 18 in the visible region was not observed. 129 The peak structure in 600800 nm in Au 25 (SR) 18 (Figures 17a and 17b) is attributed to absorption from the Au 13 core in the center of the Au 25 (SR) 18 cluster (Figure 1). 47,92,110,111 Thus, the peak structure is considered to be lost because the cluster structure was changed significantly by removal of the ligands after calcination.…”

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confidence: 99%

“…This indicates that after mixing, almost all of the Au 25 (SG) 18 Figure 16). 129 Figures 18a18d show results of the characterization of Au 25 (SG) 18 BaLa 4 Ti 4 O 15 with 0.1 wt % Au after calcination. In the TEM images (Figure 18a), only particles with diameter similar to those observed prior to calcination were observed (1.2 « 0.3 nm) (Figure 18b), indicating that AWARD ACCOUNTS Bull.…”

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confidence: 99%

“…Note, however, that when the adsorbed Au content is greater than 0.2 wt %, the particle size increases after calcination. 129 Under these conditions, Au 25 (SG) 18 is adsorbed onto BaLa 4 Ti 4 O 15 in short intervals, which may cause aggregation of the clusters during calcination with an associated increase in particle diameter. 129 Figure 19 shows the time dependence of the amount of gas emitted using Au 25 BaLa 4 Ti 4 O 15 with 0.1 wt % Au.…”

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confidence: 99%

“…The loading of microscopic gold nanoclusters on photocatalysts is extremely difficult using conventional methods. 129 The use of Au 25 (SG) 18 as a precursor is therefore effective for the loading of microscopic gold clusters on BaLa 4 Ti 4 O 15 . Note, however, that when the adsorbed Au content is greater than 0.2 wt %, the particle size increases after calcination.…”

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Toward the Creation of Functionalized Metal Nanoclusters and Highly Active Photocatalytic Materials Using Thiolate-Protected Magic Gold Clusters

Negishi

2013

Bulletin of the Chemical Society of Japan

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Advances in developments in nanotechnology have encouraged the creation of highly functionalized nanomaterials. Thiolate-protected gold clusters (Au n (SR) m ) less than 2 nm in size exhibit size-specific physical and chemical properties not observed in bulk metals. Therefore, they have attracted attention as functional units or building blocks in nanotechnology. The highly stable, magic Au n (SR) m clusters possess great potential as new nanomaterials. We are studying the following subjects related to magic Au n (SR) m clusters: (1) establishing methods to enhance their functionality, (2) developing high-resolution separation methods, and (3) utilizing the clusters as active sites in photocatalytic materials. Through these studies, we aim to create highly functional metal nanoclusters and apply them as highly active photocatalytic materials. The results of our efforts to date are summarized in this paper.

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Filling the Gap: Atomically Precise Metal Nanoclusters‐Induced Z‐Scheme Photosystem toward Robust and Stable Solar Hydrogen Generation

Yan

Xiao

2023

Adv Funct Materials

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Atomically precise metal nanoclusters (NCs) represent a promising generation of metal nanomaterial because of characteristic atomic stacking mode, abundant catalytic active sites, and molecular‐like discrete energy band structure. However, crafting metal NCs‐dominated photocatalytic systems with mediated charge transport pathways for photoredox catalysis is in the infant stage and their photocatalytic mechanisms remain elusive, which is largely hampered by the ultra‐short charge lifetime, generic instability, and complicated electronic structure of metal NCs. In this study, the smart construction of all‐solid‐state metal NCs‐transition metal chalcogenides quantum dots (TMCs QDs) Z‐scheme artificial photosystems for robust and stable solar‐to‐hydrogen conversion is demonstrated. The concurrent favorable photosensitization efficiency of metal NCs and TMCs QDs synergistically stimulate the unexpected Z‐scheme charge transport pathway, which significantly boosts the anisotropic spatial vectorial charge transport/separation, giving rise to considerably enhanced visible‐light‐responsive photocatalytic hydrogen generation performances along with favorable stability. This study would push forward the prosperity of exploring metal NCs‐based photosystems for solar‐to‐hydrogen conversion.

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Enhanced photocatalytic water splitting by BaLa4Ti4O15 loaded with ∼1 nm gold nanoclusters using glutathione-protected Au25 clusters

Cited by 108 publications

References 38 publications

Reversible Size Control of Silver Nanoclusters via Ligand-Exchange

Reversible Size Control of Silver Nanoclusters via Ligand-Exchange

Toward the Creation of Functionalized Metal Nanoclusters and Highly Active Photocatalytic Materials Using Thiolate-Protected Magic Gold Clusters

Filling the Gap: Atomically Precise Metal Nanoclusters‐Induced Z‐Scheme Photosystem toward Robust and Stable Solar Hydrogen Generation

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