Shape Evolution of Cu<sub>2</sub>O Nanostructures via Kinetic and Thermodynamic Controlled Growth

Ng, Choon Hwee Bernard; Fan, Wai Yip

doi:10.1021/jp061835k

Cited by 215 publications

(138 citation statements)

References 39 publications

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“…Specifically, transformation of hexagons into triangles is similar to that observed in other systems [32,33] and is due to the fact that the alternating {100} faces along the hexagons perimeter have higher surface energies [34] and grow more rapidly than the {111} faces. Transformation of hexagons into dodecagons is a more complex process ( Figure 5 a) that begins with the formation of three {110} crystal faces at three alternate corners of a hexagon ( Figure 5 b) [35] with subsequent formation of three other {110} faces at the remaining corners ( Figure 5 c).…”

supporting

confidence: 68%

Synthesis of Heterodimeric Sphere–Prism Nanostructures via Metastable Gold Supraspheres

et al. 2007

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Noble-metal nanoparticles of nonspherical shapes are interesting for their size-and shape-dependent optical properties [1] and for potential applications in hyperthermia of tumors, [2] pathogen detection, [3] and infrared-absorbing coatings. [4] Typically, such particles are grown in the presence of surfactants that stabilize certain crystallographic faces. For example, silver nanocubes can be prepared by stabilizing the Ag {100} faces with poly(4-vinylpyrrolidone) (PVP), [5] while gold nanorods are grown readily in the presence of cetyltrimethylammonium bromide (CTAB), which adsorbs selectively onto Au {100} faces. [6] Other nanostructures prepared by the latter method include gold hexagons, [7][8][9] gold triangles, [10][11][12] silver disks, [13] and several other shapes. [14] Recently, considerable effort has been devoted to the preparation of hybrid or dimer nanostructures, in which two (or more) domains of different shapes or material properties are permanently connected. [15] Such structures are usually made by epitaxial nucleation and growth on presynthesized nanoparticle seeds [16,17] or by thermal decomposition of core-shell nanoparticles.[18]Herein, we describe a conceptually different route to a new class of nanoscopic heterodimers composed of spherical and polygonal domains. In our method, individual nanoparticles (NPs) are first assembled into metastable, supraspherical aggregates (SS, Figure 1 a, b), and are then thermally decomposed into heterodimers (Figure 2). These composite particles are the result of temperature-induced coalescence of individual NPs accompanied by crystal nucleation. During this process, the relative sizes and dimensions of the SS and crystalline domains change controllably and give rise to pronounced changes in the particles optical response.In a typical experiment, gold supraspheres (SS, diameter 96 AE 13 nm [19][20][21][22][23] ) were prepared by rapid addition of 1,8-octanedithiol dissolved in toluene (2.86 mm, 40 mL) to a stirred solution of gold nanoparticles (c Au = 1.0 mm, 1.75 mL) stabilized in toluene by excess didodecyldimethylammonium bromide (DDAB, 9 mm) and dodecylamine (DDA, 20 mm ; Figure 1 a, b). The dithiol molecules displaced a portion of the loosely bound surfactant molecules and simultaneously crosslinked the NPs. The cross-linking continued until all NPs in solution were aggregated into spherical aggregates (SS), each composed of approximately 2500 NPs and with an average of 150 dithiol ligands per NP (for details of the growth mechanism, see reference [21]). When the SS solution was heated at 95 8C, it remained blue for times t < 100 min, then rapidly turned gray; subsequently, its color slowly changed to green (t % 100-200 min, Figure 1 c). Corresponding UV/Vis spectra showed that at around t = 100 min, the intensity of the SS surface plasmon resonance (SPR) band at l max = 580 nm decreased dramatically, while a new, strong band at l max = 920 nm appeared

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confidence: 68%

Synthesis of Heterodimeric Sphere–Prism Nanostructures via Metastable Gold Supraspheres

et al. 2007

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“…To date, CAs have played an important role on shape‐controlled synthesis of NCs,137, 138, 139, 140, 141, 142 and there are many successful examples in preparing Cu 2 O NCs 7, 8, 75, 107, 122, 125, 143. We will introduce some classic synthetic routes of Cu 2 O NCs enclosed by low‐index facets.…”

Section: Basic Growth Strategies For Cu2o Polyhedramentioning

confidence: 99%

Facet‐Controlled Synthetic Strategy of Cu₂O‐Based Crystals for Catalysis and Sensing

2015

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Shape‐dependent catalysis and sensing behaviours are primarily focused on nanocrystals enclosed by low‐index facets, especially the three basic facets ({100}, {111}, and {110}). Several novel strategies have recently exploded by tailoring the original nanocrystals to greatly improve the catalysis and sensing performances. In this Review, we firstly introduce the synthesis of a variety of Cu2O nanocrystals, including the three basic Cu2O nanocrystals (cubes, octahedra and rhombic dodecahedra, enclosed by the {100}, {111}, and {110} facets, respectively), and Cu2O nanocrystals enclosed by high‐index planes. We then discuss in detail the three main facet‐controlled synthetic strategies (deposition, etching and templating) to fabricate Cu2O‐based nanocrystals with heterogeneous, etched, or hollow structures, including a number of important concepts involved in those facet‐controlled routes, such as the selective adsorption of capping agents for protecting special facets, and the impacts of surface energy and active sites on reaction activity trends. Finally, we highlight the facet‐dependent properties of the Cu2O and Cu2O‐based nanocrystals for applications in photocatalysis, gas catalysis, organocatalysis and sensing, as well as the relationship between their structures and properties. We also summarize and comment upon future facet‐related directions.

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“…Due to this limitation, green synthesis of CuO NAPs has been discussed under headings plants, and bio-polymers. Green syntheses of CuO NAPs have been performed by using plant extracts, microbial cell biomass or cell free growth medium and biopolymers [3]. The plants used for CuO NAPs synthesis range from algae to angiosperms; however, limited reports are available for lower plants and the most suitable choice are the angiosperm plants [4].…”

Section: Biological Reducing Agents:-mentioning

confidence: 99%

“…Zeta potential values indicate the stability of synthesized CuO NAPs. Thermo-Gravimetric Analysis (TGA) is used to find the effect of Cu (NO) 3 .3H 2 O and L-cystine on the organic composition of CuO NAPs [58] to find out the amount of organic material in synthesized CuO NAPs [33] and predict the thermal stability of CuO NAPs [34]. Inductive Coupled Plasma (ICP) analysis was performed to analyze the concentration and conversion of CuO NAPs [13].…”

Section: Separation Of Cuo Naps:-mentioning

confidence: 99%

“…Much attention attracted by nanoparticles on account of their unique properties and energetic application which are strongly influenced by their size, morphology and structure. Cupric oxide nanomaterials have attracted much attention on account of their distinctive properties among other metal oxides nanomaterials [3]. Cupric oxide nanoparticles have got great consideration because it is Green synthesis is potentially advantageous over chemical or microbial approach as it simplifies the process and also results in production at larger scale [14].…”

Section: …………………………………………………………………………………………………… Introduction:-mentioning

confidence: 99%

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BIOGENIC SYNTHESIS OF CuO NANOPARTICLES AND THEIR BIOMEDICAL APPLICATIONS: A CURRENT REVIEW.

Khan¹,

Shahid²,

Sajid³

et al. 2017

IJAR

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In this paper, brief reviews for the synthesis of copper oxide nanoparticles by the different green routes are described. Since last few years, synthesis of nanoparticles has been attracted considerable attention. The metal oxides are important technology materials used as antibacterial, antioxidant, antifungal as well as catalysts in chemical industries and in electronic and photonic devices. Due to the applications in advanced technologies, researchers have focused more on synthesis of CuO nanoparticles with improved, cost effective ecofriendly synthetic strategies. Copper oxide nanoparticles appear as a brownish-black powder. They can be reduced to metallic copper when exposed to hydrogen or carbon monoxide under high temperature. Copper oxide nanoparticles are used in wide range of applications such as biological, catalysis, gas sensors, magnetic storage media, batteries, solar energy transformer, semiconductors, and field emission. CuO, as a P-type semiconductors exhibiting narrow band gap, have attracted great attention due to its potential application in Nano devices such as electronic, optoelectronics. …………………………………………………………………………………………………….... Introduction:-During the last few decades, the interests of scientists are increasing continuously day by day in the field of science and technology at the nanometer range. Nano-science and nanotechnology is supposed to wrap all fields of science and technology because any material particle is made up of atoms and molecules [1]. In science and technology, was considered well-progressed interdisciplinary field of research in last few year. Particularly metal oxide nanoparticles have extensive well-known their application of in many fields of science including chemical industry, electronics, biomedical sciences, biosensor, molecular catalysts, magnetic materials and drug gene delivery due to their physical and chemical properties different from those in the bulk material [2]. Main focus of nanoscience and nanotechnology is synthesis of new nanoparticles with various sizes and new morphology. Due to change in morphology strongly effects on their broadly varying properties. Much attention attracted by nanoparticles on account of their unique properties and energetic application which are strongly influenced by their size, morphology and structure. Cupric oxide nanomaterials have attracted much attention on account of their distinctive properties among other metal oxides nanomaterials [3]. Cupric oxide nanoparticles have got great consideration because it is

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Shape Evolution of Cu₂O Nanostructures via Kinetic and Thermodynamic Controlled Growth

Cited by 215 publications

References 39 publications

Synthesis of Heterodimeric Sphere–Prism Nanostructures via Metastable Gold Supraspheres

Synthesis of Heterodimeric Sphere–Prism Nanostructures via Metastable Gold Supraspheres

Facet‐Controlled Synthetic Strategy of Cu₂O‐Based Crystals for Catalysis and Sensing

BIOGENIC SYNTHESIS OF CuO NANOPARTICLES AND THEIR BIOMEDICAL APPLICATIONS: A CURRENT REVIEW.

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Shape Evolution of Cu2O Nanostructures via Kinetic and Thermodynamic Controlled Growth

Cited by 215 publications

References 39 publications

Synthesis of Heterodimeric Sphere–Prism Nanostructures via Metastable Gold Supraspheres

Synthesis of Heterodimeric Sphere–Prism Nanostructures via Metastable Gold Supraspheres

Facet‐Controlled Synthetic Strategy of Cu2O‐Based Crystals for Catalysis and Sensing

BIOGENIC SYNTHESIS OF CuO NANOPARTICLES AND THEIR BIOMEDICAL APPLICATIONS: A CURRENT REVIEW.

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Shape Evolution of Cu₂O Nanostructures via Kinetic and Thermodynamic Controlled Growth

Facet‐Controlled Synthetic Strategy of Cu₂O‐Based Crystals for Catalysis and Sensing