Template-free co-assembly of preformed Au and TiO2 nanoparticles into multicomponent 3D aerogels

Heiligtag, Florian J.; Rossell, Marta D.; Süess, Martin; Niederberger, Markus

doi:10.1039/c1jm11740h

Cited by 80 publications

(104 citation statements)

References 60 publications

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“…Kotov and co-workers reported the synthesis of self-standing films of gold nanoparticles in polyurethane. [101] The surface areas of the aerogels are considerably larger than those of the initial nanopowders, ranging from 300 up to 500 m 2 g −1 . To get fully macroscopic materials, which can be used as stretchable conductors, several as-prepared films were laminated and consolidated into stacks by hot-pressing (Figure 10a, right).…”

Section: From Nano To Macro: Assembly and Colloidal Processing Over Smentioning

confidence: 97%

Multiscale Nanoparticle Assembly: From Particulate Precise Manufacturing to Colloidal Processing

Niederberger

2017

Adv Funct Materials

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Nanoparticle assembly and colloidal processing are two techniques with the goal to fabricate materials and devices from preformed particles. While colloidal processing has become an integral part of ceramic processing, nanoparticle assembly is still mainly limited to academic interests. It typically starts with the precise synthesis of building blocks, which are generally not only considerably smaller than those used for colloidal processing, but also better defined in terms of size, shape, and size distribution. Their arrangement into 1D, 2D, and 3D architectures is performed with great accuracy well beyond what is achieved by colloidal processing. At the same time, the final assembly is not sintered such that the intrinsic, nanospecific properties of the initial building blocks are preserved or even lead to collective behavior. However, in contrast to colloidal processing the structures accessible by nanoparticle assembly are often limited to a small length scale. The review presents selected examples of nanoparticle assembly and colloidal processing with the goal to reveal the capabilities of these two techniques to fabricate novel materials from preformed building blocks, and also to demonstrate the immense opportunities that would arise if the two methods could be combined with each other.

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Section: From Nano To Macro: Assembly and Colloidal Processing Over Smentioning

confidence: 97%

Multiscale Nanoparticle Assembly: From Particulate Precise Manufacturing to Colloidal Processing

Niederberger

2017

Adv Funct Materials

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“…[194] These materials show excellent supercapacitive performances.T ernary hybrid aerogels made from GO,N iFe-layered double hydroxide,a nd N-deficient porous C 3 N 4 ,o btained from ah ydrothermal co-destabilization approach, showed great potential for photoelectrochemical water oxidation. [196][197][198] Starting from TRIS-functionalized TiO 2 nanoparticles in water, which can be destabilized by annealing to form at hree-dimensional network, they incorporated either Au and Fe 3 O 4 or Au and WO x nanoparticles into the anatase gel structure.F or the Au/TiO 2 hybrid aerogels they reported ag ood photocatalytic degradation of ar hodamine dye under artificial sunlight illumination. [196][197][198] Starting from TRIS-functionalized TiO 2 nanoparticles in water, which can be destabilized by annealing to form at hree-dimensional network, they incorporated either Au and Fe 3 O 4 or Au and WO x nanoparticles into the anatase gel structure.F or the Au/TiO 2 hybrid aerogels they reported ag ood photocatalytic degradation of ar hodamine dye under artificial sunlight illumination.…”

Section: Gels From Hybrid Nanostructuresmentioning

confidence: 99%

“…[195] TheN iederberger group produced several oxide-based hybrid aerogels. [196] Using the same approach they produced magnetite/anatase hybrid gels with different loadings and could show astructured phase separation when the assembly was conducted in an external magnetic field. [196] Using the same approach they produced magnetite/anatase hybrid gels with different loadings and could show astructured phase separation when the assembly was conducted in an external magnetic field.…”

Section: Gels From Hybrid Nanostructuresmentioning

confidence: 99%

Modern Inorganic Aerogels

et al. 2017

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Essentially, the term aerogel describes a special geometric structure of matter. It is neither limited to any material nor to any synthesis procedure. Hence, the possible variety of materials and therefore the multitude of their applications are almost unbounded. In fact, the same applies for nanoparticles. These are also just defined by their geometrical properties. In the past few decades nano-sized materials have been intensively studied and possible applications appeared in nearly all areas of natural sciences. To date a large variety of metal, semiconductor, oxide, and other nanoparticles are available from colloidal synthesis. However, for many applications of these materials an assembly into macroscopic structures is needed. Here we present a comprehensive picture of the developments that enabled the fusion of the colloidal nanoparticle and the aerogel world. This became possible by the controlled destabilization of pre-formed nanoparticles, which leads to their assembly into three-dimensional macroscopic networks. This revolutionary approach makes it possible to use precisely controlled nanoparticles as building blocks for macroscopic porous structures with programmable properties.

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“…Zhang et al, 2009;Zhang et al, 2010). From a practical perspective, OA frequently underlies the growth of complex architectures ranging from quasi-one-and two-dimensional structures (Tang and Kotov, 2005;Cho et al, 2005;Tian et al, 2012;Yu et al, 2005;Sharma et al, 2009;Halder and Ravishankar, 2007; G. Schliehe et al, 2010;Liu et al, 2012;Yuwono et al, 2010), such as nanowires, nanoribbons, and nanosheets, to hierarchical two-or three-dimensional superstructures (Heiligtag et al, 2011;Zitoun et al, 2005;Yang and Zeng, 2004). In the interest of achieving controlled bottom-up (and often surfactantfree) synthesis of these potentially useful structures, a strong fundamental understanding of OA is highly beneficial.…”

Section: Introductionmentioning

confidence: 98%

Atomic-scale aspects of oriented attachment

Fichthorn

2015

Chemical Engineering Science

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TiO 2 nanocrystal aggregation mechanisms are quantified using molecular dynamics. In vacuum, TiO 2 nanocrystal aggregation is directed by electrostatics. In water, TiO 2 nanocrystals exhibit oriented attachment. Oriented attachment is facilitated by adsorbed water and surface hydroxyls. a b s t r a c tOriented attachment (OA), or the non-random aggregation of crystallites to form single or twinned crystals, has been observed is a variety of different systems during crystal growth. OA is believed to underlie the growth of anisotropic and potentially useful nanostructures, such as wires and plates, as well as complex hierarchical nanostructures. However, its origins are poorly understood. I review insights into OA that we gained in two sets of molecular-dynamics simulation studies of titanium dioxide (anatase) nanocrystals. In the first set of studies, we focused on the role of intrinsic nanocrystal forces in facilitating nanocrystal alignment and aggregation in vacuum. These studies show that, although nanocrystal aggregation occurs in a predictable way, OA is not a common outcome. In a second set of studies, we used the ReaxFF reactive force field to study anatase nanocrystal aggregation in an aqueous (humid) environment. OA occurs in these studies and is mediated by adsorbed water and surface hydroxyls. The OA mechanisms that we find for anatase may be common to other aqueous metal-oxide systems.

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Template-free co-assembly of preformed Au and TiO2 nanoparticles into multicomponent 3D aerogels

Cited by 80 publications

References 60 publications

Multiscale Nanoparticle Assembly: From Particulate Precise Manufacturing to Colloidal Processing

Multiscale Nanoparticle Assembly: From Particulate Precise Manufacturing to Colloidal Processing

Modern Inorganic Aerogels

Atomic-scale aspects of oriented attachment

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