The role of twinning in shape evolution of anisotropic noble metal nanostructures

Elechiguerra, Jose Luis; Reyes‐Gasga, J.; Yacamán, Miguel José

doi:10.1039/b607128g

Cited by 474 publications

(503 citation statements)

References 76 publications

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“…The amount of oxidant is usually determined by the surface active sites of the catalysts. 52 The relevant chemical reactions include separation of electron-hole pairs due to irradiation and …”

Section: Photocatalytic Propertiesmentioning

confidence: 99%

Template free synthesis of CuS nanosheet-based hierarchical microspheres: an efficient natural light driven photocatalyst

et al. 2014

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Well controlled nanosheets-based hierarchical microspheres (NSHMS) of pure covellite phase CuS were synthesized using a facile PVP assisted solvothermal process. The reaction conditions were optimized using various amounts of PVP to develop unique hierarchical structured hollow microspheres. CuS hollow structures have a bandgap of ~1.97 eV. These mesoporous structures exhibit excellent photocatalytic activity in degradation of organic dyes (Methylene Blue) under natural light in comparison to other structures of copper sulphide. These photocatalysts show extraordinary reusability with over 96.5% degradation of organic dye after 6th cycle. A "bottom-up" assembly was successfully developed to synthesize hollow microspheres with unique and well defined architectures at large scale, which offer a good opportunity to understand the fundamental significance of unusual and complex hierarchical structures for their potential applications. This journal is the Partner Organisations 2014.Keywords nanosheet, light, driven, cus, free, synthesis, hierarchical, photocatalyst, template, microspheres, efficient, natural Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsTanveer, M., Cao, C., Ali, Z., Aslam, I., Idrees, F., Khan, W. S., But, F. K., Tahir, M. & Mahmood, N. (2014 Well controlled nanosheets-based hierarchical microspheres (NSHMS) of pure covellite phase CuS were synthesized using a facile PVP assisted solvothermal process. The reaction conditions were optimized using various amounts of PVP to develop unique hierarchical structured hollow microspheres. CuS hollow structures have a bandgap of~1.97 eV. These mesoporous structures exhibit excellent photocatalytic activity in degradation of organic dyes (Methylene Blue) under natural light in comparison to other structures of copper sulphide. These photocatalysts show extraordinary reusability with over 96.5% degradation of organic dye after 6th cycle. A "bottom-up" assembly was successfully developed to synthesize hollow microspheres with unique and well defined architectures at large scale, which offer a good opportunity to understand the fundamental significance of unusual and complex hierarchical structures for their potential applications.

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Section: Photocatalytic Propertiesmentioning

confidence: 99%

Template free synthesis of CuS nanosheet-based hierarchical microspheres: an efficient natural light driven photocatalyst

et al. 2014

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“…Consequently, for a platinum nanocrystal growing via multiple twinning events, the energetically favored condition is for the twinning system to propagate in the direction orthogonal to the twin plane (Tadmor and Bernstein 2004). The formation of polyhedral nanocrystals via multiple twinning systems emanating in different directions is energetically unfavorable in the case of platinum (Elechiguerra et al 2006). Figure 2 shows characteristic HRTEM images of the sample composed of (96:1) Pt:BSA, also called nanorods.…”

Section: Characterization Of the Nanomaterialsmentioning

confidence: 99%

Influence of morphology in the catalytic activity of bioconjugated platinum nanostructures

et al. 2010

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Platinum nanoparticles stabilized by a protein, bovine serum albumin, have been synthesized successfully with two different morphologies such as cuboctahedra and nanorods. They have been characterized by the use of different techniques such as XPS, PCS, TEM, and STEM-HAADF. These nanoparticles have been applied as catalysts for the hydrogenation of allyl alcohol in an aqueous solution. A key finding of this article is the superior catalytic activity of the nanorods compared to the cuboctahedral particles. This difference in the catalytic activity was justified because of the variation in the amount of protein to stabilize the nanorods. A model for the nanorods and equations that describe the proportion of atoms in the different sites of the particle (face, vertex, edge, or interior) is used to calculate the percentage of atoms that are located on the nanorod surface. The stability of these particles as catalysts was also studied. The results showed that Pt nanorods and Pt cuboctahedra particles were degraded after 24 h of reaction.

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“…Poly(vinylpyrrolidone) (PVP) is the most widely used capping agent to control not only the size but also the shape of the metal clusters where PVP molecules interact strongly through their carbonyl group by oxygen atom with the metal surface for their enhanced stabilization [32,33]. Chemical syntheses offer a versatile route by assembling atoms and particles from the atomic or molecular state to the macroscopic scale [34]. The characteristics of the crystals can be controlled by the thermodynamics and kinetics of the synthesis [35].…”

Section: Introductionmentioning

confidence: 99%

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

et al. 2015

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Recently, small (\2 nm) and monodispersed Pt clusters has gained much attention due to their high catalytic activity in the aerobic oxidations. However, the chemical synthesis of small Pt clusters is not trivial; high temperature is often required to completely reduce the Pt 4?/2? ions to Pt 0 , which accelerates the growth of the Pt clusters. Here, we discussed a very simple microfluidic reduction of Pt 4? to Pt 0 by NaBH 4 in the presence of PVP that produces \2 nm Pt clusters in any variable reduction conditions. The microfluidic reduction conditions were optimized for the synthesis of possible smallest Pt clusters in terms of five reaction parameters: (1) temperature, (2) concentration of H 2 PtCl 6 , (3) molar ratio of NaBH 4 to Pt 4? ions, (4) molar ratio of PVP-monomer to Pt 4? ions, and (5) molecular weight/chain length of PVP. We found that possible smallest particles with average diameter 1.3 ± 0.3 nm were produced when aqueous solutions of H 2 PtCl 6 (4 mM) and NaBH 4 (40 mM) containing PVP (160 mM) were injected into the micromixer placed in an icebath at a flow rate of 200 mL/h. The produced particles were characterized by UV-visible absorption spectrophotometry, powder X-ray diffractometry and transmission electron microscopy.

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The role of twinning in shape evolution of anisotropic noble metal nanostructures

Cited by 474 publications

References 76 publications

Template free synthesis of CuS nanosheet-based hierarchical microspheres: an efficient natural light driven photocatalyst

Template free synthesis of CuS nanosheet-based hierarchical microspheres: an efficient natural light driven photocatalyst

Influence of morphology in the catalytic activity of bioconjugated platinum nanostructures

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

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