Hollow Inorganic Nanospheres and Nanotubes with Tunable Wall Thicknesses by Atomic Layer Deposition on Self‐Assembled Polymeric Templates

Ras, Robin H. A.; Kemell, Marianna; Wit, Joost de; Ritala, Mikko; Brinke, G. ten; Leskelä, Markku; Ikkala, Olli

doi:10.1002/adma.200600728

Cited by 130 publications

(102 citation statements)

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“…Most syntheses of porous metal oxide films reported so far have focused on template-assisted methods. 18,19 Recently, there have been a few reports on the preparation of porous metal oxide powders by chemical conversion methods, such as chemical conversion from CdCO 3 to CdO, 20 from CuS to CuO, 21 and from cobalt hydroxide to Co 3 O 4 . 22a Although these methods can produce porous metal oxide films or powders, it is still hard to separately control the film thickness, and the grain and crystal sizes.…”

Section: Introductionmentioning

confidence: 99%

Highly porous metal oxide polycrystalline nanowire films with superior performance in gas sensors

Guo

Zhu

et al. 2011

J. Mater. Chem.

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In this work, we report for the first time a simple two-step route to fabricate a novel porous metal oxide film composed of polycrystalline nanowires with ultra-small nanoparticles, good interconnectivity between nanoparticles, and a high density of ultra-fine nanopores. The as-prepared metal oxide films combine the advantages of small crystal size, high surface-to-volume ratio, and one-dimensionalnanowire-induced unique charge transport paths (with correspondingly high interconnectivity). Taking In 2 O 3 as an example, porous In 2 O 3 films, composed of polycrystalline In 2 O 3 nanowires with ultra-small nanocrystals (less than 10 nm) and a high density of ultra-fine nanopores (1.6-3.1 nm), have shown very high sensitivity and good reproducibility towards ethanol gas, which are 10-20 times higher than for In 2 O 3 octahedra and commercial SnO 2 thick films. The response/recovery speeds of the as-prepared porous In 2 O 3 films are also 5-6 times higher than for In 2 O 3 octahedra, SnO 2 nanobelts, and commercial SnO 2 thick films. We believe that such metal oxide flexible films made from highly porous nanowires will replace their traditional thick film counterparts, not only in gas sensors but also in other functional devices, such as batteries, supercapacitors, solar cells, etc.

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Section: Introductionmentioning

confidence: 99%

Highly porous metal oxide polycrystalline nanowire films with superior performance in gas sensors

Guo

Zhu

et al. 2011

J. Mater. Chem.

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“…transition metal oxide tubes. 20,[22][23] Blends of block copolymers with homopolymers that have a specific exothermic interaction with one of the blocks of the block copolymers have been investigated in the past by different groups. [24][25][26][27][28] In several studies polystyrene-based block copolymers were combined with PPE.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of PPE in Lamellar Self-Assembled PS-b-P4VP(PDP) Supramolecules and PS-b-P4VP Diblock Copolymers

et al. 2006

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Self-assembled blends of PS-b-P4VP(PDP) supramolecules, obtained by hydrogen bonding of pentadecylphenol (PDP) side chains to poly(4-vinylpyridine), and poly(2,6-dimethyl-1,4-diphenyl oxide) (PPE) were investigated by thermal analysis and small-angle X-ray scattering (SAXS) and compared with blends of PS-b-P4VP and PPE. Differential scanning calorimetry (DSC) measurements showed a single composition dependent T g of the PPE/PS layers for both systems, demonstrating that PPE is distributed throughout the PS layers. Furthermore, DSC showed that for the PPE/PS-b-P4VP(PDP) blends the presence of PDP is not restricted to the P4VP layers. Its partial presence in the PS-containing domains was confirmed by nuclear magnetic resonance (NMR) spectroscopy on PS-P4VP core-corona nanorods prepared from hexagonally self-assembled PS-b-P4VP-(PDP) supramolecules. The results of the SAXS study on the dependence of the lamellar period of PPE/PS-b-P4VP blends on the amount of PPE were in excellent agreement with a theoretical model based on the Alexander-De Gennes approximation assuming a uniform distribution of PPE throughout the PS layers. For PPE/PS-b-P4VP(PDP) blends the dependence of the long period on the amount of PPE turned out to be somewhat stronger, which may be related to the supramolecular comb-shaped nature of the P4VP(PDP) blocks.

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“…18 Atomic layer deposition allows conformal inorganic coatings where the polymer template can even be removed by heat treatment at the end. 21 2: Cleaving native cellulose nanofibers from plant cell wall material. Strong acidic hydrolysis leads to rod-like highly crystalline cellulose I nanowhiskers, whereas milder hydrolysis and shearing allows long and entangled native nanofibers.…”

Section: Resultsmentioning

confidence: 99%

Solid state nanofibers based on self-assemblies: from cleaving from self-assemblies to multilevel hierarchical constructs

et al. 2009

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Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Ikkala, O., Ras, R. H. A., Houbenov, N., Ruokolainen, J., Paakko, M., Laine, J., ... Lindström, T. (2009). Solid state nanofibers based on self-assemblies: from cleaving from self-assemblies to multilevel hierarchical constructs. Faraday Discussions, 143, 95-107. DOI: 10.1039/b905204f Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Self-assemblies and their hierarchies are useful to construct soft materials with structures at different length scales and to tune the materials properties for various functions. Here we address routes for solid nanofibers based on different forms of self-assemblies. On the other hand, we discuss rational ''bottom-up'' routes for multi-level hierarchical self-assembled constructs, with the aim of learning more about design principles for competing interactions and packing frustrations. Here we use the triblock copolypeptide poly(L-lysine)-b-poly(gbenzyl-L-glutamate)-b-poly(L-lysine) complexed with 2 0 -deoxyguanosine 5 0 -monophosphate. Supramolecular disks (G-quartets) stabilized by metal cations are formed and their columnar assembly leads to a packing frustration with the cylindrical packing of helical poly(g-benzyl-L-glutamate), which we suggest is important in controlling the lateral dimensions of the nanofibers. We foresee routes for functionalities by selecting different metal cations within the G-quartets. On the other hand, we discuss nanofibers that are cleaved from bulk self-assemblies in a ''top-down'' manner. After a short introduction based on cleaving nanofibers from diblock copolymeric self-assemblies, we focus on native cellulose nanofibers, as cleaved from plant cell wall fibers, which are expected to have feasible mechanical properties and to be templates for functional nanomaterials. Long nanofibers with 5-20 nm lateral dimensions can be cleaved within an aqueous medium to allow hydrogels and water can be removed to allow highly porous, lightweight, and flexible aerogels. We further describe inorganic/

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Hollow Inorganic Nanospheres and Nanotubes with Tunable Wall Thicknesses by Atomic Layer Deposition on Self‐Assembled Polymeric Templates

Cited by 130 publications

References 54 publications

Highly porous metal oxide polycrystalline nanowire films with superior performance in gas sensors

Highly porous metal oxide polycrystalline nanowire films with superior performance in gas sensors

Incorporation of PPE in Lamellar Self-Assembled PS-b-P4VP(PDP) Supramolecules and PS-b-P4VP Diblock Copolymers

Solid state nanofibers based on self-assemblies: from cleaving from self-assemblies to multilevel hierarchical constructs

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