The Assembly of Coated Nanocrystals

Liz‐Marzán, Luis M.; Mulvaney, Paul

doi:10.1021/jp027835b

Cited by 281 publications

(217 citation statements)

References 145 publications

(201 reference statements)

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“…The Au-APTMS-'Si' system shifted from 48 to 570 nm (Table 1), and the Au-APTMS-'FeSi' system shifted from 91 to 613 nm (Table 2). These shifts are indicative of dipole-dipole coupling of neighbouring Au NPs, the shift being directly proportionate to the separation of the Au NPs [2,10,16]. These shifts are in good agreement with the TEM analysis where the average Au NP separation decreases as the volume of the Au NP colloidal dispersion increases.…”

Section: Tem Characterisation Of Au-aptms-'fesi' Hollow Spheressupporting

confidence: 84%

“…From the literature, it is seen that a variety of approaches have been used to prepare Au-'Si' composites . There are papers dedicated to adsorbing Au NPs inside [2][3][4][5][6][7][8][9][10][11], outside [12][13][14][15][16][17][18][19][20][21][22][23][24][25] or both sides [25][26][27] of 'Si' spheres. The surface of the 'Si' or template would usually be chemically modified to allow the assembly of Au NPs or AuCl the surfaces of the spheres [29].…”

Section: Introductionmentioning

confidence: 99%

“…Au NPs can be distributed on the internal surface of a hollow sphere using different methods, i.e. reduction of HAuCl 4(aq) on the inside 'Si' hollow spheres [4], preparation of sacrificial core-Au NP-'Si' or 'Si' core-Au NP-'Si' composite [2,5,6], Au NPs interdispersed inside the 'Si' shell [9] or Au-'Si' core-shell NPs have been assembled on polystyrene spheres [10]. However, the extent of Au NP coverage achieved by these methods is not high.…”

Section: Introductionmentioning

confidence: 99%

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One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly

Begum

Jones

Lynch

et al. 2012

Journal of Experimental Nanoscience

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A concentrated citrate-stabilised Au nanoparticle (NP) colloid has been prepared using a modified Frens procedure, and characterised using transmission electron microscopy (TEM) and UV-Vis absorption spectroscopy. The average diameter determined from TEM images of concentrated Au NPs (16.57 AE 0.65 nm) is similar to the diameter reported by Frens (16 nm). The surface plasmon band of the concentrated Au NPs UV-Vis spectrum has a max at 522 nm. Bare silica ('Si') and iron-'Si' hollow microsphere surfaces have been functionalised with amino groups using the surfactant 3-aminopropyltrimethoxysilane (APTMS). The Au NPs have been assembled onto the APTMS-treated hollow spheres by dispersing a colloid of Au NPs into a suspension of hollow spheres at pH 4.5 (2 h). The volume ratio of Au NPs: hollow spheres was adjusted until maximum deposition could be achieved in a single step. TEM micrographs of ultrathin (80-100 nm) ultramicrotome sections through the Au NP-coated hollow spheres reveal that a single layer of Au NPs is mainly distributed on (1) the external side of the shell wall for 'Si' and (2) both sides of the shell wall for iron-'Si'. UV-Vis absorption spectra of the Au NP-coated hollow spheres show that the surface plasmon band shifts (524-613 nm) and broadens as the density of Au NPs is increased on the shell surface.

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Section: Tem Characterisation Of Au-aptms-'fesi' Hollow Spheressupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly

Begum

Jones

Lynch

et al. 2012

Journal of Experimental Nanoscience

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“…capping noble metal particles of Ag, Au, or Pt [133] with a semiconductor shell. Metal particles with a favorable Fermi level (0.4 V) such as silver and gold are good electron acceptors and facilitate rapid electron transfer from excited TiO 2 .…”

Section: Cappingmentioning

confidence: 99%

A review of TiO2 nanoparticles

2011

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Climate change and the consumption of non-renewable resources are considered as the greatest problems facing humankind. Because of this, photocatalysis research has been rapidly expanding. TiO 2 nanoparticles have been extensively investigated for photocatalytic applications including the decomposition of organic compounds and production of H 2 as a fuel using solar energy. This article reviews the structure and electronic properties of TiO 2 , compares TiO 2 with other common semiconductors used for photocatalytic applications and clarifies the advantages of using TiO 2 nanoparticles. TiO 2 is considered close to an ideal semiconductor for photocatalysis but possesses certain limitations such as poor absorption of visible radiation and rapid recombination of photogenerated electron/hole pairs. In this review article, various methods used to enhance the photocatalytic characteristics of TiO 2 including dye sensitization, doping, coupling and capping are discussed. Environmental and energy applications of TiO 2 , including photocatalytic treatment of wastewater, pesticide degradation and water splitting to produce hydrogen have been summarized. Historical backgroundThe growth of industry worldwide has tremendously increased the generation and accumulation of waste byproducts. In general, the production of useful products has been focused on and the generation of waste byproducts has been largely ignored. This has caused severe environmental problems that have become a major concern. Researchers all over the world have been working on various approaches to address this issue. Photoinduced processes have been studied and various applications have been developed. One important technique for removing industrial waste is the use of light energy (electromagnetic radiation) and particles sensitive to this energy to mineralize waste which aids in its removal from solution. Titanium dioxide (TiO 2 ) is considered very close to an ideal semiconductor for photocatalysis because of its high stability, low cost and safety toward both humans and the environment.*Corresponding author (email: shipra.mital@gmail.com)In 1964, Kato et al.[1] published their work on the photocatalytic oxidation of tetralin (1,2,3,4-tetrahydronaphthalene) by a TiO 2 suspension, which was followed by McLintock et al. [2] investigating the photocatalytic oxidation of ethylene and propylene in the presence of oxygen adsorbed on TiO 2 . However, the most important discovery that extensively promoted the field of photocatalysis was the "Honda-Fujishima Effect" first described by Fujishima and Honda in 1972 [3]. This well-known chemical phenomenon involves electrolysis of water, which is related to photocatalysis. Photoirradiation of a TiO 2 (rutile) single crystal electrode immersed in an aqueous electrolyte solution induced the evolution of oxygen from the TiO 2 electrode and the evolution of hydrogen from a platinum counterelectrode when an anodic bias was applied to the TiO 2 working electrode. In 1977, Frank and Bard [4] examined the reduction of ...

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“…One contribution of 13 to a Theme Issue 'Metal clusters and nanoparticles '. This journal is © 2010 The Royal Society applications among others in sensorics (Lahav et al 1999;Willner & Willner 2002;Raschke et al 2003;Alivisatos 2004;Härtling & Eng 2005), photonics (Liz-Marzan & Mulvaney 2003;Lu et al 2005aLu et al ,b, 2006 and in medical diagnostics (O'Neal et al 2004;Loo et al 2005); additional toxicity tests are necessary in the last of these (Connor et al 2005;Nel et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of noble metal nanoparticles and their non-ordered superstructures

Bigall

Eychmüller

2010

Phil. Trans. R. Soc. A.

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This article highlights our recent work concerning the synthesis of metal nanoparticles and their non-ordered superstructures. After a short introduction, the basic synthetic procedures are explained for the nanoparticles used for the assemblies. Furthermore, a fabrication method is itemized for very monodisperse platinum nanoparticles in aqueous solution ranging in diameter from 10 to 100 nm showing distinct optical properties. The next section deals with the synthesis of non-ordered hydro-and aerogels from the asprepared sols. Very light large surface materials from gold, silver, platinum and goldsilver and platinum-silver sols can be fabricated with the given method. Another way to ultralight superstructures of noble metal nanoparticles using fungi as templates is described in the third section. Although fungi grow inside the colloidal solutions they can assemble the nanoparticles onto their surfaces. These hybrid systems are thus extremely interesting supported superstructures for applications in heterogeneous catalysis, since the numbers of nanoparticles on the fungus can easily be tuned, and the fabrication process is cost-effective, environmentally friendly and the organic templates can be easily removed by simple combustion for regaining the noble metal.

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The Assembly of Coated Nanocrystals

Cited by 281 publications

References 145 publications

One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly

One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly

A review of TiO2 nanoparticles

Synthesis of noble metal nanoparticles and their non-ordered superstructures

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