Surface ligand mediated growth of CuPt nanorods

Yu, Fengjiao; Xu, Xiaoxiang; Baddeley, Christopher J.; Bellabarba, Ronan M.; Lignier, Pascal; Tooze, Robert P.; Fina, Federica; Irvine, John T. S.; Zhou, Wuzong

doi:10.1039/c3ce41524d

Cited by 8 publications

(11 citation statements)

References 55 publications

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“…[2][3][4][5] Compared to the traditional Ostwald ripening (OR) mechanism, OA exhibits unprecedented advantage in synthesizing anisotropic NRs of various materials. [6][7][8] In particular, the thermodynamics and kinetics of NR growth has been investigated extensively for the rational design of synthetic parameters in an OA growth. [9][10][11][12][13][14][15] The initial stage of an OA NR growth is of fundamental signicance in the OA growth of NRs since it determines the following elongation of NRs.…”

Section: Introductionmentioning

confidence: 99%

Initial-stage oriented-attachment one-dimensional assembly of nanocrystals: fundamental insight with a collision–recrystallization model

Pan

Niu

et al. 2015

RSC Adv.

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Oriented attachment (OA) growth has been a promising method for the synthesis of one dimensional (1D) anisotropic nanocrystals (NCs). An unresolved fundamental issue is to understand the growth mechanism at the initial stage of an OA nanorod (NR) growth. In this report, a collision-recrystallization model is proposed to investigate the initial OA growth of NRs. The repulsive electrical double layer (EDL) interaction and the attractive van der Waals (vdW) interaction at the initial OA stage are derived by the accurate surface element integration (SEI) technique and the classical Hamaker equation, respectively. Our results show that the self-recrystallization of nanochains increases the collision activation energy of NPs dramatically as their surface potentials and Hamaker constants increase. Under a specific electrolyte concentration, the collision activation energy reaches the maximum, indicating that the growth rate of OA can be controlled by adjusting the electrolyte concentration.

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Section: Introductionmentioning

confidence: 99%

Initial-stage oriented-attachment one-dimensional assembly of nanocrystals: fundamental insight with a collision–recrystallization model

Pan

Niu

et al. 2015

RSC Adv.

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“…13,14 In this case, the crystal growth is confined by the pore size. One dimensional growth to form nanorods or nanowires can also be achieved by surface protection with ligands, 15,16 or by using porous templates such as anodic aluminum oxide. 17 Very long C60/trimethylbenzene composite nanowires can grow via the evaporation of solvent from a thin layer of C60/trimethylbenzene solution, where the diameter of the nanowires is controlled by the thickness of the solution layer.…”

Section: Introductionmentioning

confidence: 99%

Growth Mechanism of Dendritic Hematite via Hydrolysis of Ferricyanide

Green

Chiang

Greer

et al. 2017

Crystal Growth & Design

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ABSTRACT:The detailed process of the hydrolysis of ferricyanide into dendritic α-Fe2O3 (hematite) crystals with snowflake-like, feather-like and leaf-like morphologies has been investigated. [Fe(CN)6] 3-anions were found to polymerize into large, disordered soft matter aggregates at an early stage. The nucleation of hematite crystals took place near the surface of these aggregates via further hydrolysis. After the crystals grew to a certain size, branches started to appear. When the concentration of ferricyanide was low (i.e. 2 mM to 3.8 mM), growth was preferentially along the six equivalent <112 ̅ 0> directions, resulting in a flat snowflake-like shape, while high concentrations (i.e. 9 mM to 500 mM) of ferricyanide led to the growth of selective directions along the <101 ̅ 1> zone axes, forming a feather-like or leaf-like morphology. Highly selective adsorption and surface hydrolysis of [Fe(CN)6] 3-anions on α-Fe2O3 crystals was found to be a crucial process in the formation of these novel morphologies. It was found that the polymerisation of ferricyanide led to a reduction of pH value and that the formation of Fe2O3 increased pH value. The pH value of the solution at the point when the branches start to grow can significantly affect the distribution of Lewis acidic sites on different surfaces and, therefore, change the growth direction. The newly established mechanism is complementary to the classical theories of crystal growth. INTRODUCTIONControl over crystal growth orientation, exposure of selected crystal facets, and formation of novel crystal morphologies are hot topics in crystal engineering and in materials science, since the morphology and size of crystals often have a significant effect on their physio-chemical properties.

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“…For the synthesis of Pt metal nanocrystals, Yang et al selected a different strategy which has been widely employed for the facile preparation of well-defined nanocrystals in conventional polyol solvents [2,77]. In their work in [C 4 C 1 Im] [NTf 2 ] (5 mL), 1,2-hexanedecanediol (0.34 mmol) was used as a reducing agent in the presence of a conventional combination of ligands, i.e.…”

Section: Size Control In the Presence Of Conventional Stabilisers In Ilsmentioning

confidence: 99%

Size Control of Monodisperse Metal Nanocrystals in Ionic Liquids

Lignier

2015

Ionic Liquids (ILs) in Organometallic Catalysis

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During the last decade, a great interest in the preparation of uniform nanocrystals has offered efficient synthetic strategies to precisely engineer metal, metal oxide and alloy at the nanoscale. Due to their physicochemical properties, ionic liquids (ILs) simultaneously demonstrated their potential in different areas such as nanocrystal synthesis, catalysis and energy. As a result, ionic liquids have been employed for the preparation of monodisperse nanocrystals and the control of their size. This chapter highlights the most promising methods for the synthesis of uniform nanocrystals in ionic liquids which act as a solvent, stabiliser, reducing agent and even precursor. As a result, successful preparations of nanoparticles in the presence of ILs are now available for both noble and earth-abundant elements such as gold, platinum, iridium, silver, palladium, ruthenium, rhodium, copper, nickel, cobalt and iron.The formation mechanisms of these nanocrystals are discussed as well as our mechanistic understanding in conventional organic and aqueous solvents. In addition, the IL approach is compared to leading methods in conventional solvents to make possible the identification of general principles for most metallic elements. By analogy with conventional solvents, these strategies can be adapted to the preparation of semiconductor nanocrystals. These achievements are going to drive the identification of relationships between the nature of ILs components, the physicochemical properties of ILs, the formation of nanocrystals in ILs and the resulting performances of these nano-objects.

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Surface ligand mediated growth of CuPt nanorods

Cited by 8 publications

References 55 publications

Initial-stage oriented-attachment one-dimensional assembly of nanocrystals: fundamental insight with a collision–recrystallization model

Initial-stage oriented-attachment one-dimensional assembly of nanocrystals: fundamental insight with a collision–recrystallization model

Growth Mechanism of Dendritic Hematite via Hydrolysis of Ferricyanide

Size Control of Monodisperse Metal Nanocrystals in Ionic Liquids

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