Photoluminescent films of microporous titanosilicate ETS-10 doped with europium(III)

Lin, Zhi; Rainho, José P.; Domingues, José Paulo; Carlos, Luı́s D.; Rocha, João

doi:10.1016/j.micromeso.2004.10.007

Cited by 17 publications

(12 citation statements)

References 24 publications

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“…charge transfer. 66 The Cu 2 O spectrum (blue up triangle) showed a luminescence between 350-550 nm, with an emission maximum at 470 nm associated with artifacts (scattering phenomena occurring at the surface of the solid), which were decreased in this spectrum with the use of filters. Photoluminescence is very sensitive to surface effects/ adsorbed species of semiconductors particles and thus can be used as a probe of electron-hole surface processes.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

“…The bands at 406 and 440 nm in the Cu 2 O spectrum are related to crystal defects introduced during the growth of the nanoparticles. 66 After the decoration of ETS-10 with 5 wt.% Cu 2 O nanoparticles (pink diamond), the most pronounced effect is the displacement of ETS-10 first peak located at 350 to 371 nm. The ETS-10/Cu 2 O interaction and disturbance can be the origin of the 21 nm peak displacement to higher wavenumbers, indicating the effect caused by the charge relocation of Cu 2 66 where Eu 3+ ETS-10 doped was analyzed by PL technique.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

“…66 After the decoration of ETS-10 with 5 wt.% Cu 2 O nanoparticles (pink diamond), the most pronounced effect is the displacement of ETS-10 first peak located at 350 to 371 nm. The ETS-10/Cu 2 O interaction and disturbance can be the origin of the 21 nm peak displacement to higher wavenumbers, indicating the effect caused by the charge relocation of Cu 2 66 where Eu 3+ ETS-10 doped was analyzed by PL technique. The results showed that the insertion of rare earth on ETS-10 decreased the electron-hole recombination occurring in the ETS-10 matrix, contributing to an increase of the probability of energy transfer from ETS-10 to the Eu 3+ ions.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

“…This solid presented a PL spectrum which is very different from that of the pure ETS-10: there is a displacement of the ETS-10 band from 350 to 360 nm, probably due to the fact that the band gap of the nanocomposite is smaller than pure ETS-10 (corresponding to a band displacement of 10 nm). 66,69 The bands observed at 398 and 490 nm are originally from CuO. 70 The peaks displacements and the increased intensity of the PL spectra of ETS-10/CuO in the 380-500 nm, in relation to the isolated semiconductors, indicate that there is an effective interaction between the species in the nanocomposite and that these promote an increased emission in the visible region.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

“…66 where Eu 3+ ETS-10 doped was analyzed by PL technique. The results showed that the insertion of rare earth on ETS-10 decreased the electron-hole recombination occurring in the ETS-10 matrix, contributing to an increase of the probability of energy transfer from ETS-10 to the Eu 3+ ions.…”

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ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

Januario

Nogueira

Pastore

2018

J. Braz. Chem. Soc.

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Photocatalytic reactions to convert CO 2 and H 2 O into solar fuels using only solar irradiation have been investigated in this work. For this purpose, titanosilicate ETS-10 was decorated with Cu 2 O and CuO nanoparticles and their properties were analyzed by different techniques. The final materials were applied in photoreduction of CO 2 in gas phase under 20 h of solar irradiation. In the final, the products oxygen, acetic acid, formaldehyde and methanol were detected by chromatographic techniques. Photoluminescence and electrochemical studies indicate the interaction between Cu x O nanoparticles and Ti-O-Ti-O on the surface of ETS-10, corroborating with the results obtained in the photocatalytic experiments. The best CO 2 photoconversion efficiencies into methanol were obtained when using ETS-10/Cu x O compared to pure ETS-10. Another important finding in this study is the fact that the reactions were carried out in the gas phase and no scavenge donors were employed.Keywords: CO 2 photoreduction, ETS-10 photocatalyst, oxygenated products, copper oxide, solar irradiation IntroductionIn the last 40 years, CO 2 emissions from fossil fuel combustion and industrial processes contributed with about 78% of the total greenhouse gases (GHG) emissions. 1 Different methods to consume CO 2 have been investigated, such as thermochemical conversion, 2-4 electrochemical reduction, [5][6][7] and photocatalytic reduction of CO 2 and water into hydrocarbons or solar fuels. [8][9][10] The use of solar energy has been highlighted as an alternative to obtain clean energy while simultaneously reducing the CO 2 concentration in the atmosphere. 11 Many chemicals are reported to be produced from water and CO 2 : formic acid, 12,13 acetic acid, 14,15 formaldehyde, 16 methanol [17][18][19] and methane. 20,21 Using a combination of metaloxides and co-catalysts we have already demonstrated the feasibility to produce both methane and methanol. 22 The first and principal step in CO 2 reduction is the oxidation of H 2 O molecules into oxygen and protons (equation 1), following the sequence described in equations 1-5. 23 Several works report the conversion to oxygenated chemicals by using sacrificial compounds, such as NaOH, 24 Titanosilicate ETS-10 (Engelhard titanium silicate) was first reported in the literature by Chapman and Roe 28 in 1990, however its structure was elucidated only in 1994 by Anderson et al. 29 using sophisticated techniques as highresolution transmission electron microscopy (HRTEM), nuclear magnetic resonance (NMR) and molecular simulations. The most interesting feature is that the ETS-10 contains a periodic structure of quantum semiconductor wires of [-O-Ti-O-Ti-] formed by TiO 6 octahedra isolated along the structure. The pores (ca. 0.67 nm diameter) run along [100] and [010] directions. [30][31][32][33] These properties make ETS-10 unique, because a short Ti-O bond length (1.71-2.11 Å) along the axial direction would not be possible outside of a zeolite framework. 34 This material absorbs ETS-10 Modified with Cu ...

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Section: Photoluminescence Spectroscopymentioning

confidence: 99%

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

Januario

Nogueira

Pastore

2018

J. Braz. Chem. Soc.

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Ten Years of Aberration Corrected Electron Microscopy for Ordered Nanoporous Materials

Zhang

Mayoral

2020

ChemCatChem

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Ordered nanoporous materials including zeolites, zeotypes, and metal‐organic frameworks (MOFs) are widely used in the fields of heterogeneous catalysis, ion exchange and gas storage/separation. In addition, due to their particular structural features new applications are continuously being explored as a consequence of their well‐defined porous network, thermal stability, acidity and guest‐species confinement. All physicochemical properties are directly structure related and therefore characterization at atomic level is highly desired. In the current work, we have aimed to review the recent progress of electron microscopy science applied to the characterization of different nanoporous materials since the first work that made use of spherical aberration (Cs) corrected electron microscopy in 2010. All difficulties encountered for the application of this technique will be presented, together with the excellent degree of information that can be extracted and the scientific responses that only Cs‐corrected electron microscopy can provide in the area of nanoporous materials, zeolites, zeotypes and MOFs.

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Impact of photogenerated charge behaviors on luminescence of Eu3+-incorporated microporous titanosilicate ETS-10

et al. 2013

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Photoluminescent films of microporous titanosilicate ETS-10 doped with europium(III)

Cited by 17 publications

References 24 publications

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

Ten Years of Aberration Corrected Electron Microscopy for Ordered Nanoporous Materials

Impact of photogenerated charge behaviors on luminescence of Eu3+-incorporated microporous titanosilicate ETS-10

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