Tuning of the photocatalytic activity of thin titanium dioxide coatings by highly ordered structure and silver nanoparticles

Ginter, Joanna; Kisielewska, Aneta; Spilarewicz-Stanek, Kaja; Cichomski, M.; Batory, D.; Piwoński, Ireneusz

doi:10.1016/j.micromeso.2016.01.029

Cited by 12 publications

(9 citation statements)

References 33 publications

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“…In particular, mesoporous structures have been studied due to their large accessible surface area and well defined uniform pore size and intrinsic connectivity, which favour an efficient charge carrier transfer and mass flow of the reactants [6,7]. In this contest, three-dimensional inverse opal structures prepared by template strategy were recently investigated as a promising class of photocatalysts with peculiar structure and macro-mesoporosity [8][9][10]. In these materials the particular porous backbone acts in fact as a photon trap, taking advantage also of the scattering effects [11,12].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic H2 production over inverse opal TiO2 catalysts

2019

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The influence of BiVO 4 and CuO on the chemico-physical properties of TiO 2-based systems is reported. The performances of these systems were investigated in the photocatalytic H 2 production both under UV and solar light irradiation. The characterization data pointed out that the obtained TiO 2 samples have highly porous inverse opal structures with interconnected macropores. Inverse opal TiO 2 exhibited higher activity in the H 2 production than the commercial TiO 2 due to the peculiar porosity that allows photons to enter inside the photocatalyst. A further improvement in terms of photoactivity was verified by addition of increasing amounts of BiVO 4. On the contrary a small CuO content was found to be the optimal one for the inverse opal TiO 2-CuO composites. In fact, due to surface segregation effects, a higher amount of CuO can partially keep the light radiation away from the TiO 2 surface active sites, thus decreasing drastically the absorption of photons. The combination of the benefits of the highly ordered porous TiO 2 structure and the presence of BiVO 4 or small amounts of CuO can represent a promising strategy towards efficient photocatalytic H 2 production.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic H2 production over inverse opal TiO2 catalysts

2019

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“…This method is simple and cheaper than a common vapour deposition of noble metals on nanostructured templates and therefore can be an ideal option for robust and cost‐efficient manufacture of SERS substrates. Processes governing the formation of AgNSs on the titanium dioxide‐based coatings can be controlled by the concentration of metal ions, UV illumination time, and reaction medium as shown in Ginter et al and Piwoński et al and were explained by the Ostwald ripening particle formation model. These parameters also affect the photocatalytic activity of TiO 2 coatings.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…These parameters also affect the photocatalytic activity of TiO 2 coatings. It was shown that modification of the TiO 2 coating with Ag nanoparticles improved the photocatalytic degradation of organic dyes compared with pure TiO 2 films [12] To date, the SERS activity of Ag-titania platforms were reported for substrates prepared by photocatalytic reduction of Ag + ions on TiO 2 films and nanoparticles, [14][15][16][17][18] chemical reduction of Ag + ions on TiO 2 nanofibers and nanorods, [19,20] magnetron sputtering of the silver on single-crystalline TiO 2 nanosheet, [21] and deposition of the metal on TiO 2 nanoarrays in the anodization process. [22] Simple UV illumination of titania coatings in a solution of silver ions results in the formation of oval or polygonal shapes with diameters between 40 and 180 nm and that are distributed as single nanoparticles (with interparticle distance from few up to approximately 50 nm) [15,16] as well as overlapped nanospheres or nanotriangles.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytical decoration of thin titania coatings with silver nanostructures provides a robust and reproducible SERS signal

Wiercigroch

Kisielewska

Blat

et al. 2019

J Raman Spectroscopy

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Cost‐effective photocatalytic synthesis was used to fabricate silver nanostructures (AgNSs) on TiO2 coatings (AgNSs/TiO2) with plasmonic properties. In this study, the AgNSs growth controlled by variation of the concentration of Ag+ ions, hole scavengers, and ultraviolet illumination was systematically studied in terms of morphological characterization, extinction, and surface‐enhanced Raman spectroscopy (SERS). These structures with well‐defined and high photocatalytic properties show a plethora of shapes (from spherical to polygonal objects), diameter (8–108 nm), and surface coverage (12–62%). Morphological properties strongly affect nanoplasmonic features as revealed by electronic and SERS spectra. Surface enhancement of Raman signal was probed by using 4‐mercaptobenzoic acid to elucidate the stability and uniformity of the designed substrates. A detailed examination and correlation of geometrical parameters and SERS performance indicate synergistic contribution of the formation of hot spots between AgNSs. Some of the fabricated AgNSs present a very good homogeneity and reproducibility as well as long‐time stability. The highest enhancement factor in SERS was obtained for the Ag–TiO2 hybrids with a diameter and surface coverage of AgNSs less than 30 nm and larger than 50%, respectively.

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“…The incorporation of Ag NPs was found to be able to narrow the band-gap energy of TiO 2 and create some plasmonic processes at the surface of TiO 2 , thus enhancing its antibacterial activity [25,26,27,28,29]. Typically, there are three routes to fabricating Ag/TiO 2 composites: the hydrothermal [30,31,32,33,34], photoreduction [23,35,36], and sol–gel [26,27,37] methods. The hydrothermal method can avoid the agglomeration of nanoparticles, but the required use of high temperature and high pressure to initiate the reaction often limits its value for industrial application.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite Film Containing Fibrous Cellulose Scaffold and Ag/TiO2 Nanoparticles and Its Antibacterial Activity

Tian

Yang

et al. 2018

Polymers

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Cellulose is a natural polymer that is widely used in daily life, but it is susceptible to microorganism growth. In this study, a simple sol–gel technique was utilized to incorporate the cellulose scaffold with Ag/TiO2 nanoparticles. The morphology and crystal structure of the as-prepared Ag/TiO2/cellulose composite film were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods. Antibacterial tests involving the use of Escherichia coli (E. coli) were carried out under dark and UV-light conditions to evaluate the efficiency of the Ag/TiO2/cellulose composite film in comparison with pristine cellulose paper and TiO2/cellulose composite film. The results indicated that the antibacterial activity of the Ag/TiO2/cellulose composite film outperformed all other samples, where the Ag content of 0.030 wt% could inhibit more than 99% of E. coli. This study suggests that finely dispersed nanocale Ag/TiO2 particles in the cellulose scaffold were effective at slowing down bacterial growth, and the mechanisms of this are also discussed.

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Tuning of the photocatalytic activity of thin titanium dioxide coatings by highly ordered structure and silver nanoparticles

Cited by 12 publications

References 33 publications

Photocatalytic H2 production over inverse opal TiO2 catalysts

Photocatalytic H2 production over inverse opal TiO2 catalysts

Photocatalytical decoration of thin titania coatings with silver nanostructures provides a robust and reproducible SERS signal

Nanocomposite Film Containing Fibrous Cellulose Scaffold and Ag/TiO2 Nanoparticles and Its Antibacterial Activity

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