Examination of Ostwald ripening in the photocatalytic growth of silver nanoparticles on titanium dioxide coatings

Piwoński, Ireneusz; Spilarewicz-Stanek, Kaja; Kisielewska, Aneta; Kądzioła, Kinga; Cichomski, M.; Ginter, Joanna

doi:10.1016/j.apsusc.2016.01.131

Cited by 36 publications

(16 citation statements)

References 24 publications

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“…Calculations based on SEM imaging revealed that the concentration of Ag + ions also affects the size of AgNSs. However, the size distribution of AgNSs obtained during their photocatalytic growth is not homogeneous, mainly because of Ostwald ripening and coalescence occurring during the growth of AgNSs . Moreover, the photocatalytic growth of AgNSs is accompanied by a continuous nucleation of new silver grains throughout the entire period of UV illumination, resulting in nanostructures having different sizes.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, parameters such as the intensity of applied light source and the amount of hole scavengers were also examined. Similar experiments aimed at the determination of the effect of the type of light source, the kind of TiO 2 coating (magnetron or solgel) on the size, and the quantity of resulting AgNSs were performed earlier and described in our previous works . To our knowledge, these factors, crucial for the generation of electrons and formation of metal nanostructures, have not been systematically examined so far in terms of SERS investigations.…”

Section: Introductionmentioning

confidence: 89%

“…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%

See 2 more Smart Citations

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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

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“…Scanning electron micrographs (SEM) recorded from a sample, predeposition (Si only), after 40 s and after 20 min autocatalytic metallization with Ag ( Figure A) also confirm that small Ag nuclei form on the Si crystals soon after immersion into the bath (40 s). After prolonged deposition, these nuclei grow into large crystals and then coalesce into even larger crystals (to reduce their surface energy) with a smooth surface . By inspecting the cross‐section of a Si‐wafer plated autocatalytically in a 1 m bath of AgNO 3 (SEM image in Figure S4, Supporting Information), we estimate the Ag layer thickness increases at ≈2 µm min −1 .…”

Section: Resultsmentioning

confidence: 99%

Autocatalytic Metallization of Fabrics Using Si Ink, for Biosensors, Batteries and Energy Harvesting

Grell

Dincer

et al. 2018

Adv Funct Materials

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Commercially available metal inks are mainly designed for planar substrates (for example, polyethylene terephthalate foils or ceramics), and they contain hydrophobic polymer binders that fill the pores in fabrics when printed, thus resulting in hydrophobic electrodes. Here, a low-cost binder-free method for the metallization of woven and nonwoven fabrics is presented that preserves the 3D structure and hydrophilicity of the substrate. Metals such as Au, Ag, and Pt are grown autocatalytically, using metal salts, inside the fibrous network of fabrics at room temperature in a two-step process, with a water-based silicon particle ink acting as precursor. Using this method, (patterned) metallized fabrics are being enabled to be produced with low electrical resistance (less than 3.5 Ω sq −1 ). In addition to fabrics, the method is also compatible with other 3D hydrophilic substrates such as nitrocellulose membranes. The versatility of this method is demonstrated by producing coil antennas for wireless energy harvesting, Ag-Zn batteries for energy storage, electrochemical biosensors for the detection of DNA/proteins, and as a substrate for optical sensing by surface enhanced Raman spectroscopy. In the future, this method of metallization may pave the way for new classes of high-performance devices using low-cost fabrics.

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“…70,73 In heterogeneous catalysis it is known that as-prepared materials are converted to the actual active catalyst primarily during initial stages of catalytic testing. For example, changes that might occur are particle sintering and Ostwald ripening [74][75][76] , or even encapsulation of metallic particles by thin substoichiometric oxides. 55 An important parameter in heterogeneous catalysis is the turnover frequency (TOF), defining the reactivity per exposed surface site per unit of time.…”

Section: Learning From Other Disciplinesmentioning

confidence: 99%

Photocatalytic overall water splitting using modified SrTiO3

Han¹

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Examination of Ostwald ripening in the photocatalytic growth of silver nanoparticles on titanium dioxide coatings

Cited by 36 publications

References 24 publications

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

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

Autocatalytic Metallization of Fabrics Using Si Ink, for Biosensors, Batteries and Energy Harvesting

Photocatalytic overall water splitting using modified SrTiO3

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