Ag, Ag<sub>2</sub>S, and Ag<sub>2</sub>Se Nanocrystals:  Synthesis, Assembly, and Construction of Mesoporous Structures

Wang, Dingsheng; Xie, Ting; Peng, Qing; Li, Yadong

doi:10.1021/ja710004h

Cited by 246 publications

(216 citation statements)

References 40 publications

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“…In nanosystems, selfassembly offers one of the few practical strategies for assembling components into larger, functional ensembles through different interactions [90]. Based on this strategy, we have developed a novel bottom-up route to design ideal structures for stable nanocatalysts, namely, using "artificial atoms" (monodisperse nanocrystals, NCs) as uniform building blocks to construct mesoporous structures [53,54,91].…”

Section: Design Of Ideal Structures For Stable Nanocatalystsmentioning

confidence: 99%

Nanocrystals: Solution-based synthesis and applications as nanocatalysts

2009

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Section: Design Of Ideal Structures For Stable Nanocatalystsmentioning

confidence: 99%

Nanocrystals: Solution-based synthesis and applications as nanocatalysts

2009

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“…Recently, we and other groups reported a general strategy for the fabrication of novel porous nanostructured materials based on the self-assembly of nanocrystals [38][39][40]. We have demonstrated that the as-prepared mesoporous nanocrystal clusters can be used for selective enrichment of peptides and proteins from complex biological samples [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Self-assembly and photocatalysis of mesoporous TiO2 nanocrystal clusters

et al. 2010

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Mesoporous nanocrystal clusters of anatase TiO 2 with large surface area and enhanced photocatalytic activity have been successfully synthesized. The synthesis involves the self-assembly of hydrophobic TiO 2 nanocrystals into submicron clusters, coating of these clusters with a silica layer, thermal treatment to remove organic ligands and improve the crystallinity of the clusters, and finally removing silica to expose the mesoporous catalysts. With the help of the silica coating, the clusters not only maintain their small grain size but also keep their mesoporous structure after calcination at high temperatures (with BET surface area as high as 277 m 2 /g). The etching of SiO 2 also results in the clusters having high dispersity in water. We have been able to identify the optimal calcination temperature to produce TiO 2 nanocrystal clusters that possess both high crystallinity and large surface area, and therefore show excellent catalytic efficiency in the decomposition of organic molecules under illumination by UV light. Convenient doping with nitrogen converts these nanocrystal clusters into active photocatalysts in both visible light and natural sunlight. The strategy of forming well-defined mesoporous clusters using nanocrystals promises a versatile and useful method for designing photocatalysts with enhanced activity and stability.

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“…Here octadecylamine (ODA) functions simultaneously as solvent, surfactant, and reducing agent [20]. Au, Pd, Pt, Ir, Ru, and Rh nanocrystals can also be synthesized in this system.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline intermetallics and alloys

2010

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Nanocrystalline intermetallics and alloys are novel materials with high surface areas which are potential low-cost and high-performance catalysts. Here, we report a general approach to the synthesis of a large variety of nanocrystalline intermetallics and alloys with controllable composition, size, and morphology: these include Au-, Pd-, Pt-, Ir-, Ru-, and Rh-based bi-or tri-metallic nanocrystals. We find that only those intermetallics and alloys whose effective electronegativity is larger than a critical value (1.93) can be prepared by co-reduction in our synthetic system. Our methodology provides a simple and convenient route to a variety of intermetallic and alloyed nanomaterials which are promising candidates for catalysts for reactions such as methanol oxidation, hydroformylation, the Suzuki reaction, cyclohexene hydroconversion, and the selective hydrogenation of acetylene. KEYWORDSIntermetallics, alloys, nanocrystals, controllable synthesis, catalystsSince the discovery of intermetallic compounds of the type MNi 5 (M = Th, U, or Zr) which perform as effective methanation catalysts [1], intermetallics, and alloys have emerged as a class of novel materials which provide great opportunities for the development of low-cost and high-performance industrial catalysts [2][3][4][5][6][7][8]. Intermetallics and alloys are traditionally synthesized using metallurgical techniques which require high-temperature heating and annealing for long periods of time [9,10]. Via these strategies, it is difficult to obtain nanocrystalline intermetallics and alloys with the high surface areas which are urgently needed in various applied fields such as energy, environment, and catalysis [11,12]. As early as 1926, Raney Ni with a high surface area was prepared via selective leaching of nickel-aluminium alloys by Murray Raney [13]. However, design of facile and general strategies for the synthesis of other intermetallics and alloys with high surface areas still remains a great challenge. Undoubtedly, the emergence and development of nanoscience and nanotechnology offer new opportunities in this area [14][15][16][17][18].Recently, we developed a general strategy for the synthesis of various nanocrystals, whereby noble metal ions can be reduced to monodisperse noble metal nanocrystals by a mixture of ethanol and linoleic acid [19]. However, attempts to synthesize intermetallics and alloys of noble and non-noble metals (e.g., FePt, NiPt, and CoPd) with this strategy were unsuccessful, mainly due to the low reducing power of ethanol and linoleic acid. On the other hand, we found that with strong reducing agents such as NaBH4 and N2H4, the Nano Res (2010) 3: 574-580 DOI 10.1007/s12274-010-0018-4 Research Article Address correspondence to ydli@mail.tsinghua.edu.cn Nano Res (2010) 3: 574-580 575 difference in electron affinities of the transition and noble metals dominates the reduction process. As a result, it becomes difficult to precisely control the nucleation and growth process to obtain intermetallics and alloys, and core-she...

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Ag, Ag₂S, and Ag₂Se Nanocrystals: Synthesis, Assembly, and Construction of Mesoporous Structures

Cited by 246 publications

References 40 publications

Nanocrystals: Solution-based synthesis and applications as nanocatalysts

Nanocrystals: Solution-based synthesis and applications as nanocatalysts

Self-assembly and photocatalysis of mesoporous TiO2 nanocrystal clusters

Nanocrystalline intermetallics and alloys

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Ag, Ag2S, and Ag2Se Nanocrystals: Synthesis, Assembly, and Construction of Mesoporous Structures

Cited by 246 publications

References 40 publications

Nanocrystals: Solution-based synthesis and applications as nanocatalysts

Nanocrystals: Solution-based synthesis and applications as nanocatalysts

Self-assembly and photocatalysis of mesoporous TiO2 nanocrystal clusters

Nanocrystalline intermetallics and alloys

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Ag, Ag₂S, and Ag₂Se Nanocrystals: Synthesis, Assembly, and Construction of Mesoporous Structures