Surface Phases of TiO<sub>2</sub> Nanoparticles Studied by UV Raman Spectroscopy and FT-IR Spectroscopy

Su, Weiguang; Zhang, Jing; Feng, Zhaochi; Chen, Tao; Ying, Pinliang; Li, Can

doi:10.1021/jp7118422

Cited by 308 publications

(238 citation statements)

References 51 publications

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“…On the other hand, after open air exposure, the intensity of the C=O group at 1396 cm −1 sharply increased. Some researchers have shown that carbonate groups form as a result of CO2 absorption on nano-TiO2 surface [45,46]. These results were also confirmed by comparing the values of the relative intensities of calcite, at 1396.3 cm −1 and of TiO2, at 1032.1 cm −1 and 1009.7 cm −1 , before and after aging.…”

Section: Fourier Transformed Infrared Spectroscopy (Atr-ftir)supporting

confidence: 57%

Protecting of Marble Stone Facades of Historic Buildings Using Multifunctional TiO2 Nanocoatings

et al. 2017

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Stone surfaces and façades of historic buildings, due to their predominately outdoor location, suffer from many deterioration factors, including air pollution, soluble salts, relative humidity (RH)/temperature, and biodeterioration, which are the main causes of decay. In particular, the façades of the buildings deteriorate with direct exposure to these factors; deformation and disfiguration of superficial decoration and formation of black crusts are often observed on the stones. The development and application of self-cleaning and protection treatments on historical and architectural stone surfaces could be a significant improvement in the conservation, protection and maintenance of Cultural Heritage. A titanium dioxide nanoparticle has become a promising photocatalytic material, owing to its ability to catalyze the complete degradation of many organic contaminants and environmental factors. In this study, TiO 2 nanoparticles, dispersed in an aqueous colloidal suspension, were applied directly to historic marble stone surfaces, by spray-coating, in order to obtain a nanometric film over the stone surface. The study started with an investigation of some properties of TiO 2 nanoparticles, to assess the feasibility of the use of TiO 2 on historic stone and architectural surfaces. Scanning electron microscopy (SEM) was, coupled with energy dispersive X-ray (EDX) microanalysis, (SEM-EDX), in order to obtain information on coating homogeneity and surface morphology, before and after artificial aging; the activity of the coated surface was evaluated through UV-light exposure, to evaluate photo-induced effects. The changes of molecular structure occurring in treated samples were spectroscopically studied by attenuated total reflection infrared spectroscopy (ATR-FTIR); activity of the hydrophobic property of the coated surface was evaluated by Sterio microscopy, model Zeiss 2010 from Munich, Germany, equipped with photo camera S23 under 80X magnification. The efficacy of the treatments was evaluated through capillary water absorption, and colorimetric measurements, performed to evaluate the optical appearance. Results showed that TiO 2 nanoparticles are good candidates for coating applications on historic stone surfaces, where self-cleaning photo-induced effects are well evident; they enhanced the durability of stone surfaces toward UV aging, improved resistance to relative humidity (RH)/temperature and abrasion affect, reduced accumulation of dirt on stone surfaces when left in open air for 6 months, and did not alter the original features.

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Section: Fourier Transformed Infrared Spectroscopy (Atr-ftir)supporting

confidence: 57%

Protecting of Marble Stone Facades of Historic Buildings Using Multifunctional TiO2 Nanocoatings

et al. 2017

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“…As seen in Fig. 3, strong bands at 143, 196, 395, 516 and 639 cm À1 are observed for TiO 2 P25 support, corresponding to the Raman-active modes of anatase with the symmetries of E g , E g , B 1g , A 1g , and E g , respectively [24]. Besides, a very weak at 446 cm À1 is also observed corresponding to the E g mode of rutile phase [25].…”

Section: Characterization Of Pt/tio 2 Prepared By Different Methodsmentioning

confidence: 77%

Catalytic oxidation of NO over TiO2 supported platinum clusters I. Preparation, characterization and catalytic properties

Shen

Cheng

et al. 2010

Applied Catalysis B: Environmental

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“…In accord with the XRD data presented above, unlike the Ti/Al(P1) system, 27 the Raman spectra of the uncalcined and calcined Ti/Al(P2) samples within 423-873 K reveal features with low Raman scattering cross sections that are common for materials with poor crystallinity and/or small crystallite sizes. [31][32][33] After the thermal treatment of the Ti/Al(P2) sample at 1073 K, a group of broad and convoluted Raman features become visible at 236, 447, and 826 cm -1 . These bands can be attributed to a poorly-crystallized rutile phase.…”

Section: Xrd Experimentsmentioning

confidence: 99%

Fine-Tuning the Dispersion and the Mobility of BaO Domains on NO_x Storage Materials via TiO₂ Anchoring Sites

2010

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In an attempt to control the surface dispersion and the mobility of BaO domains on NO x storage materials, TiO 2 /TiO x anchoring sites were introduced on/inside the conventional γ-Al 2 O 3 support matrix. BaO/TiO 2 / Al 2 O 3 ternary oxide materials were synthesized via two different sol-gel preparation techniques, with varying surface compositions and morphologies. The synthesized NO x storage materials were studied via XRD, Raman spectroscopy, BET surface area analysis, TPD, XPS, SEM, EDX-mapping, and in situ FTIR spectroscopy of adsorbed NO 2 . NO x uptake properties of the BaO/TiO 2 /Al 2 O 3 materials were found to be strongly influenced by the morphology and the surface structure of the TiO 2 /TiO x domains. An improved Ba surface dispersion was observed for the BaO/TiO 2 /Al 2 O 3 materials synthesized via the coprecipitation of alkoxide precursors, which was found to originate mostly from the increased fraction of accessible TiO 2 /TiO x sites on the surface. These TiO 2 /TiO x sites function as strong anchoring sites for surface BaO domains and can be tailored to enhance surface dispersion of BaO. TPD experiments suggested the presence of at least two different types of NO x species adsorbed on the TiO 2 /TiO x sites, with distinctively different thermal stabilities. The relative stability of the NO x species adsorbed on the BaO/TiO 2 /Al 2 O 3 system was found to increase in the following order: NO + /N 2 O 3 on alumina , nitrates on alumina < surface nitrates on BaO < bridged/bidentate nitrates on large/isolated TiO 2 clusters < bulk nitrates on BaO on alumina surface and bridged/bidentate nitrates on TiO 2 crystallites homogenously distributed on the surface < bulk nitrates on the BaO sites located on the TiO 2 domains.

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Surface Phases of TiO₂ Nanoparticles Studied by UV Raman Spectroscopy and FT-IR Spectroscopy

Cited by 308 publications

References 51 publications

Protecting of Marble Stone Facades of Historic Buildings Using Multifunctional TiO2 Nanocoatings

Protecting of Marble Stone Facades of Historic Buildings Using Multifunctional TiO2 Nanocoatings

Catalytic oxidation of NO over TiO2 supported platinum clusters I. Preparation, characterization and catalytic properties

Fine-Tuning the Dispersion and the Mobility of BaO Domains on NO_x Storage Materials via TiO₂ Anchoring Sites

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Surface Phases of TiO2 Nanoparticles Studied by UV Raman Spectroscopy and FT-IR Spectroscopy

Cited by 308 publications

References 51 publications

Protecting of Marble Stone Facades of Historic Buildings Using Multifunctional TiO2 Nanocoatings

Protecting of Marble Stone Facades of Historic Buildings Using Multifunctional TiO2 Nanocoatings

Catalytic oxidation of NO over TiO2 supported platinum clusters I. Preparation, characterization and catalytic properties

Fine-Tuning the Dispersion and the Mobility of BaO Domains on NOx Storage Materials via TiO2 Anchoring Sites

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Product

Resources

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Surface Phases of TiO₂ Nanoparticles Studied by UV Raman Spectroscopy and FT-IR Spectroscopy

Fine-Tuning the Dispersion and the Mobility of BaO Domains on NO_x Storage Materials via TiO₂ Anchoring Sites