Synthesis of Gold Nano- and Microplates in Hexagonal Liquid Crystals

Wang, Luyan; Xiao, Changfa; Zhan, Jie; Chai, Yongcun; Yang, Chun; Xu, Limei; Zhuang, Weihua; Jing, Bo

doi:10.1021/jp0449152

Cited by 190 publications

(147 citation statements)

References 96 publications

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“…An alternative mechanism proposed by Wang et al arises from the initial spontaneous self-assembly of particles along a particular crystallographic orientation. This is followed by other Au particles coalescing at the planar interface, which effectively reduces their surface energy and contributes to the growth of the particle along this particular orientation [40]. In this study, analysis of the XRD data clearly indicates the dominance of the (111) orientation and confirms preferential particle growth along (111) crystal plane.…”

Section: Aucl 4ˉþ Mottlecah Leaf Extract → Stabilised Au Nps ð1þsupporting

confidence: 53%

Green biosynthesis of gold nanometre scale plates using the leaf extracts from an indigenous Australian plant Eucalyptus macrocarpa

Poinern

Chapman

et al. 2013

Gold Bull

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In this preliminary study, we demonstrate an environmentally friendly process for the green synthesis of gold nanometre scale particles using the leaf extract from an indigenous Australian plant Eucalyptus macrocarpa as both the stabilising agent and the reducing agent. The synthesis process is straightforward, clean and non-toxic. It also has the advantages of being performed at room temperature and does not need complex processing equipment. Formation of the gold nanometre sized particles was confirmed and characterised by UV-visible spectroscopy, X-ray diffraction, transmission electron microscopy and field emission scanning electron microscopy. The antibacterial activity of the synthesised gold particles was also quantified using the sensitivity method of Kirby-Bauer.

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Section: Aucl 4ˉþ Mottlecah Leaf Extract → Stabilised Au Nps ð1þsupporting

confidence: 53%

Green biosynthesis of gold nanometre scale plates using the leaf extracts from an indigenous Australian plant Eucalyptus macrocarpa

Poinern

Chapman

et al. 2013

Gold Bull

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“…Subsequently, they extended their research to obtain products of controllable shape and size [105]. Single-crystalline Au nano-and micro-plates with triangular or hexagonal shapes were synthesized by reducing HAuCl 4 in LLC with the addition of a small amount of capping agents.…”

Section: -D Nanostructuresmentioning

confidence: 99%

Lyotropic liquid crystal directed synthesis of nanostructured materials

Wang

Chen

Jiao

2009

Science and Technology of Advanced Materials

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This review introduces and summarizes lyotropic liquid crystal (LLC) directed syntheses of nanostructured materials consisting of porous nanostructures and zero-dimensional (0-D), one-dimensional (1-D) and two-dimensional (2-D) nanostructures. After a brief introduction to the liquid crystals, the LLCs used to prepare mesoporous materials are discussed; in particular, recent advances in controlling mesostructures are summarized. The LLC templates directing the syntheses of nanoparticles, nanorods, nanowires and nanoplates are also presented. Finally, future development in this field is discussed.

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“…In spite of the availability of a number of methods [2][3][4][5][6][7][8][12][13][14][15] , the mechanism of formation of such structures remains elusive. Mechanisms based on preferential adsorption of surfactants 8,16 , oriented attachment 16 , soft templates 17,18 , aggregation of spherical particles 4 and kinetic control [6][7][8]18,19 have been proposed in the literature but do not satisfactorily explain the shape control. Here, we show for the first time that this problem can be analysed based on classical crystal growth concepts.…”

mentioning

confidence: 99%

Predicting the growth of two-dimensional nanostructures

et al. 2008

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Abstract:The ability to predict the morphology of crystals formed by chemical reactions is of fundamental importance for the shape-controlled synthesis of nanostructures.Based on the atomistic mechanism for crystal growth under different driving forces, we have developed morphology diagrams to predict regimes for the growth of two-dimensional crystals. By using controlled reactions for crystal growth in the absence of surfactants/capping agents, we demonstrate the validity of this approach for the formation of 2-D structures of Au, Ag, Pt, Pd andhydroxyapatite.An understanding of the external morphology of crystals and its relation to internal structure has been a topic of active study since the times of Kepler. It is well-recognised that the morphology of nanostructures affects their properties profoundly [1][2][3][4][5][6][7][8] . Twodimensional nanostructures in the form of platelets/sheets, nanoprisms and belts exhibit intriguing properties that have several potential applications [1][2][3][4]6,7,[9][10][11] . In spite of the availability of a number of methods [2][3][4][5][6][7][8][12][13][14][15] , the mechanism of formation of such structures remains elusive. Mechanisms based on preferential adsorption of surfactants 8,16 , oriented attachment 16 , soft templates 17,18 , aggregation of spherical particles 4 and kinetic control [6][7][8]18,19 have been proposed in the literature but do not satisfactorily explain the shape control. Here, we show for the first time that this problem can be analysed based on classical crystal growth concepts. Based on the atomistic mechanism for crystal growth under different driving forces 20,21 , we have developed morphology diagrams to predict conditions under which two-dimensional crystals form. By using controlled reactions for crystal growth in the absence of reducing and capping agents or by precipitation under controlled conditions coupled with detailed microstructural evidence, we demonstrate the validity of this approach for the formation of 2-D nanostructures of Au, Ag, Pt, Pd and hydroxyapatite. The analysis and experiments have important consequences for rational synthesis of two-dimensional nanostructures and answer some long-standing questions related to their growth. The generality of the analysis implies that it can be used to predict regimes of two-dimensional growth in a variety of systems ranging from crystals synthesized from a solution phase, from the vapor phase and inorganic phases formed by biomineralization.The formation of crystals from vapor or in a liquid phase proceeds by nucleation and growth mechanism with the driving force given by the associated volume free energy change. Based on the driving force, two distinct growth regimes can be identified. At large driving forces, the interface can move normal to itself leading to a continuous growth (Fig. 1A). At low driving forces, however, growth has to rely on the formation of steps and a lateral motion of steps on the surface [20][21][22] . It has been proposed that screw dislocations enable crysta...

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Synthesis of Gold Nano- and Microplates in Hexagonal Liquid Crystals

Cited by 190 publications

References 96 publications

Green biosynthesis of gold nanometre scale plates using the leaf extracts from an indigenous Australian plant Eucalyptus macrocarpa

Green biosynthesis of gold nanometre scale plates using the leaf extracts from an indigenous Australian plant Eucalyptus macrocarpa

Lyotropic liquid crystal directed synthesis of nanostructured materials

Predicting the growth of two-dimensional nanostructures

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