Synthesis of copper nanoparticles within the interlayer space of titania nanosheet transparent films

Sasaki, Kazuhisa; Matsubara, Kazuki; Kawamura, Shiori; Saito, Kenji; Yagi, Masayuki; Norimatsu, Wataru; Sasai, Ryo; Yui, Tatsuto

doi:10.1039/c5tc03152d

Cited by 17 publications

(15 citation statements)

References 52 publications

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“…Further details of the XRD analyses are summarized in Table S1 (Supporting Information). The initial TNS/MV 2+ film exhibits clear d (002) and (004) signals at 7.8° and 15.3°, respectively, and this is in good agreement with the results of an earlier report . This result indicates that MV 2+ molecules (molecular size: ≈1.3 × 0.4 nm) adopt almost parallel orientations in single layers.…”

Section: Resultssupporting

confidence: 91%

“…Ogawa and co‐workers and our group have reported the in situ synthesis of various MNPs within the interlayer spaces of layered inorganic compounds. Our technique enables the formation of clear films having strong LSPR extinctions owing to the optical transparency of layered titania nanosheets (TNSs), and relatively large amounts of MNPs are accommodated in their interlayer space.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Stable Silver Nanoparticles Having Wide Red‐To‐Near‐Infrared Extinction

et al. 2018

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The synthesis of silver nanoparticles (AgNPs) within the interlayer space of transparent layered titania nanosheet (TNS) films is investigated. A considerable number of silver ions (≈70% against the cation exchange capacity of the TNS) are intercalated in the TNS films using methyl‐viologen‐containing TNSs as a precursor. The silver ion (Ag + )‐containing TNS films are treated with aqueous sodium tetrahydroborate (NaBH 4 ), resulting in a gradual color change to bright blue. Various structural analyses clearly show that crystalline AgNPs are generated within the interlayer space of the TNSs. The NaBH 4 ‐treated films show intense and characteristic near‐infrared (NIR) extinction spectra up to 1800 nm. The stability of the AgNPs within the TNS against oxygen and moisture is also investigated, and 96% and 82% of the AgNPs remain after standing in air for 1 month and 1 year, respectively. The NIR extinctions of the AgNP‐containing TNS films are further extended by employing different preparation procedures, for example, using sintered TNS films as starting materials and irradiating the Ag + ‐containing TNSs with ultraviolet (UV) light. The obtained AgNP‐containing TNS films exhibit photochemical activities in the production of hydrogen from ammonia borane under visible‐light irradiation and the decomposition of nitrogen monoxide under UV‐light irradiation.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Preparation of Stable Silver Nanoparticles Having Wide Red‐To‐Near‐Infrared Extinction

et al. 2018

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“…As already reported in the literature, the exchange of the ammonium ions inside the interlayer of TNSs with metal cations, such as silver, gold, and copper, allows synthesizing in situ plasmonic nanoparticles and nanoclusters . The development of polymeric membranes with embedded metal nanoparticles is of great interest in the nanotechnology field for optical, electrical, and biological applications .…”

Section: Introductionmentioning

confidence: 93%

“…These nanoparticles have been investigated for the fabrication of thin films for optoelectronic applications and in combination with a polymeric matrix for the generation of proton exchange membranes . TNSs were combined with silk fibroin (SF) for the fabrication of nanocomposite thin films and membranes with tunable optical properties and processability at the micro and nanoscale range .…”

Section: Introductionmentioning

confidence: 99%

Functionalization of Titanates–Silk Nanocomposites via Cation Exchange for Optical Applications

Colusso

Vitiello

Perotto

et al. 2018

Adv Materials Inter

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A wide number of organic and inor ganic materials presents cation exchange properties, such as proteins and poly saccharides, phenolic, acrylic and poly styrene divinyl resins, zeolites, and layered metal oxides. [5,6] Layered titanates are titanium oxide based compounds, with a unique struc ture composed of a 2D host with a guest cation. They have been largely investi gated because of their exchange capacity for application in adsorption of heavy metal ions from water, generation of proton exchange membrane fuel cells or for the synthesis of complex metal oxide structures. [2,[7][8][9] In particular, titanate nanosheets (TNSs) are 2D crystals with a layered nanostructure of [Ti n O 2n+1 ] 2− composition and very small dimension (oneunitcell thickness and 2-6 nm in length). They present good cation exchange properties at the nanoscale because of their high surfacetovolume ratio, the high concentration of hydroxylic groups, and the interlayer distance adaptability. [10][11][12] These nanoparticles have been investigated for the fabrica tion of thin films for optoelectronic applications [13,14] and in combination with a polymeric matrix for the generation of proton exchange membranes. [15] TNSs were combined with silk fibroin (SF) for the fabrication of nanocomposite thin films and membranes with tunable optical properties and processability at the micro and nanoscale range. [16,17] Silk fibroin showed to be an excellent material for the development of biocom patible optical devices and sensors, thanks to its exceptional mechanical and optical properties, associated with biocompat ibility and biodegradability. Many studies have been made on the development of optical and photonic applications based on silk, as microlenses, waveguides, diffraction grating, and inverse opals. [18][19][20][21][22] Recently, researchers have used proteins in combination with 2D nanomaterials (e.g., graphene, dielectric nanosheets, and MXenes) for the generation of nanostructures composites with engineered properties. [23][24][25] These hybrids materials combine the advantages of the biopolymeric matrix, such as biocompatibility and mechanical robustness, with the unique electronic and optical properties of the 2D fillers. In addition, proteins can provide a precise control on the assembly of the material, thanks to the physical and chemical interac tions established with the 2D material. For example, molecular A simple and efficient method is developed to introduce plasmonic and luminescence functionalities in titanate nanosheets (TNSs)-silk nano composites by direct cation-exchange process. First, the cation exchange properties such as exchange kinetic and capacity are studied to verify the behavior of the material and determine the best condition of exchange. In particular, the effect of the valence on the kinetic is investigated through elemental analysis, focusing on three target cations (Ag + , Cu 2+ , and Eu 3+ ) in water. It is demonstrated that the cation exchange capability of the composite is strictly dependent of the amount ...

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“…It was observed that methanol was selectively dehydrogenated to methyl formate over Cu/laponite and Cu/ Na(Mg 2.5 Si 4 O 10 F 2 ) clay catalysts, in contrast methanol dehydration to dimethyl ether was the predominant reaction over the Cu/saponite and Cu/montmorillonite catalysts 8 . It was also reported that the interlayer copper ions keep the initial oxidation state even in the reductive reaction conditions 9 . The low activity of copper supported clay catalysts is associated with unavailability of copper for methanol molecules because of its disposition in the interlayer space of the clay 10 .…”

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confidence: 97%

Structural and catalytic properties of copper silicate nanomaterials

Bawaked

Narasimharao

2020

Sci Rep

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Nanosized copper silicates with three different structural morphology (amorphous, nanotubes and MEL) were prepared using different synthesis methods. The physico-chemical properties of copper silicates were characterized by XRD, FT-IR, SEM, HRTEM, N 2 -physisorption, XPS and H 2 -TPR techniques. The results indicated that the preparation conditions affect reduction behavior and textural properties of nanosized copper silicates. Hydrothermal synthesis method yielded chrysocollalike cuSio 3 nanotubes, which possessed high surface area and pore volume with easy reducibility. The catalytic performances of synthesized copper silicate nanostructures were evaluated for dehydrogenation of methanol. It was found that dehydrogenation activity is depended on the structural properties of copper silicates. Highest activity was observed for copper silicates with nanotube morphology. Catalytic dehydrogenation activity of copper silicates was also related to presence of more number of Cu-O-Si species, easy reducibility and Lewis acid centers. The CuSiO 3 nanotubes sample also exhibited good stability under investigated reaction conditions that deactivation was not detected for 48 h.

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Synthesis of copper nanoparticles within the interlayer space of titania nanosheet transparent films

Abstract: We report the first in situ synthesis of copper nanoparticles (CuNPs) within the interlayer space of inorganic layered semiconductor (titania nanosheets; TNSs) transparent films.

Cited by 17 publications

References 52 publications

Preparation of Stable Silver Nanoparticles Having Wide Red‐To‐Near‐Infrared Extinction

Preparation of Stable Silver Nanoparticles Having Wide Red‐To‐Near‐Infrared Extinction

Functionalization of Titanates–Silk Nanocomposites via Cation Exchange for Optical Applications

Structural and catalytic properties of copper silicate nanomaterials

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