Nanocrystalline Ge filaments in the pores of a mesosilicate

León, R.; Margolese, D.; Stucky, Galen D.; Petroff, P. M.

doi:10.1103/physrevb.52.r2285

Cited by 111 publications

(91 citation statements)

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“…24 The Ag and Pt nanoparticles remain small in the silica maxtrix, however, the gold particles grow to much larger sizes during the reduction process. This work shows that the incorporation of various metal ions, ionic (6,7,8) refer to the prolonged reduction after removing of silvery mirror surface layer. compounds, water soluble dyes and so forth are all feasible through true LC approaches 24 for producing new functional mesoporous silica materials.…”

Section: Resultsmentioning

confidence: 74%

“…[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Incorporation of noble metals into the pores of MCM type materials was first attempted by Ryoo and Ko 9 in order to image the structure of MCM-41 using TEM. Later, various applications of these metal nanoparticles such as non-linear optics and catalysis promoted further studies of these mesostructured metal-silica nanocomposite materials.…”

Section: Introductionmentioning

confidence: 99%

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The synthesis of mesostructured silica films and monoliths functionalised by noble metal nanoparticles

et al. 2003

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A lyotropic AgNO 3 , HAuCl 4 and H 2 PtCl 6 -silica liquid crystalline (LC) phase is used as a supramolecular template for a one-pot synthesis of novel noble metal or complex ion containing nanocomposite materials in the form of a film and monolith. In these structures, Ag 1 , AuCl 4 2 and PtCl 6 22 ions interact with the head group of an oligo(ethylene oxide) type non-ionic surfactant (C 12 H 25 (CH 2 CH 2 O) 10 OH, denoted as C 12 EO 10 ) assembly that are embedded within the channels of hexagonal mesostructured silica materials. A chemical and/ or thermal reduction of the metal or complex ions produces nanoparticles of these metals in the mesoporous channels and the void spaces of the silica. The LC mesophase of H 2 O : X : HNO 3 : C 12 EO 10 , (where X is AgNO 3 , HAuCl 4 and H 2 PtCl 6 ), and nanocomposite silica materials of meso-SiO 2 -C 12 EO 10 -X and meso-SiO 2 -C 12 EO 10 -M (M is the Ag, Au and Pt nanoparticles) have been investigated using polarised optical microscopy (POM), powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), Fourier transform (FT) Raman and UV-Vis absorption spectroscopy. Collectively the results indicate that the LC phase of a 50 w/w% H 2 O : C 12 EO 10 is stable upon mixing with AgNO 3 , HAuCl 4 and H 2 PtCl 6 salts and/or acids. The metal ions or complex ions are distributed inside the channels of the mesoporous silica materials at low concentrations and may be converted into metal nanoparticles within the channels by a chemical and/or thermal reduction process. The metal nanoparticles have a broad size distribution where the platinum and silver particles are very small (typically 2-6 nm) and the gold particles are much larger (typically 5-30 nm).

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Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

The synthesis of mesostructured silica films and monoliths functionalised by noble metal nanoparticles

et al. 2003

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“…a 5.5 nm colloid can be produced in a 5.5 nm pore. 98 This was also used for the preparation of semiconductor nanoparticles, [99][100][101][102] metal colloids or even metal nanowires, 103,104 or carbon structures. 95,105 This new field of research where chemistry is done under confinements or with special side conditions (i.e.…”

Section: Discussionmentioning

confidence: 99%

Porous materials via nanocasting procedures: innovative materials and learning about soft-matter organization

2002

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Nanocasting, the 3D-transformation of self-assembled organic nanostructures into hollow inorganic replicas under preservation of fine structural details has recently turned out to be a versatile tool, both for the synthesis of porous media with new pore topology as well as for the characterization of the assembled structures themselves. This review gives a review on recent work describing the potential and restrictions of nanocasting using surfactants, polymers, colloids as well as supramolecular tectons as porogens.

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“…Mesoporous solids [21][22][23][24] that contain uni-directional arrays of pores, typically 2-15 nm in diameter, running throughout the material have been successfully exploited as templates for nanomaterials synthesised from chemical vapour deposition (CVD), [25][26][27][28] electrodeposition, [29][30][31] and incipient wetness [32][33][34][35][36][37] techniques. These methods have yielded nanomaterials within the pores but the high temperatures or extensive reaction times often required for successful nucleation and growth of the materials within the mesopores makes these techniques costly and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Conductive films of ordered nanowire arrays

et al. 2004

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High-density, ordered arrays of germanium nanowires have been synthesised within the pores of mesoporous thin films (MTFs) and anodized aluminium oxide (AAO) matrices using a supercritical fluid solution-phase inclusion technique. Conductive atomic force microscopy (C-AFM) was utilised to study the electrical properties of the nanowires within these arrays. Nearly all of the semiconductor nanowires contained within the AAO substrates were found to be conducting. Additionally, each individual nanowire within the substrate possessed similar electrical properties demonstrating that the nanowires are continuous and reproducible within each pore. C-AFM was also able to probe the conductance of individual nanowires, 3-4 nm in diameter, within the MTF templates. The ability to synthesise ordered arrays of semiconducting nanowires is a key step in future bottom-up fabrication of multilayered device architectures for potential nanoelectronic and optoelectronic devices.

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Nanocrystalline Ge filaments in the pores of a mesosilicate

Cited by 111 publications

References 1 publication

The synthesis of mesostructured silica films and monoliths functionalised by noble metal nanoparticles

The synthesis of mesostructured silica films and monoliths functionalised by noble metal nanoparticles

Porous materials via nanocasting procedures: innovative materials and learning about soft-matter organization

Conductive films of ordered nanowire arrays

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