The effect of gold shape and size on the properties and visible light-induced photoactivity of Au-TiO2

Gołąbiewska, Anna; Malankowska, Anna; Jarek, Marcin; Lisowski, Wojciech; Nowaczyk, Grzegorz; Jurga, Stefan; Zaleska-Medynska, Adriana

doi:10.1016/j.apcatb.2016.05.013

Cited by 91 publications

(48 citation statements)

References 72 publications

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“…Thus, understanding how functionalization and buffer composition influence the physical stability of gold nanostars is important. For instance, nanostructure size governs resulting electro-optical properties, stability in solution, as well as how these nanomaterials interact with/influence matter [28, 43]. Here, gold nanostars synthesized via reduction of EPPS [33] are used to explore how functionalization and ionic strength impact the size, structure, surface potential, and optical stability (and hence the physical stability) of gold nanostars.…”

Section: Resultsmentioning

confidence: 99%

How to accurately predict solution-phase gold nanostar stability

Phan

Haes

2018

Anal Bioanal Chem

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Unwanted nanoparticle aggregation and/or agglomeration may occur when anisotropic nanoparticles are dispersed in various solvents and matrices. While extended Derjaguin-Landau-Verwey-Overbeek (DLVO) theory has been successfully applied to predict nanoparticle stability in solution, this model fails to accurately predict the physical stability of anisotropic nanostructures; thus limiting its applicability in practice. Herein, DLVO theory was used to accurately predict gold nanostar stability in solution by investigating how the choice of the nanostar dimension considered in calculations influences the calculated attractive and repulsive interactions between nanostructures. The use of the average radius of curvature of the nanostar tips instead of the average radius as the nanostar dimension of interest increases the accuracy with which experimentally observed nanoparticle behavior can be modeled theoretically. This prediction was validated by measuring time-dependent localized surface plasmon resonance (LSPR) spectra of gold nanostars suspended in solutions with different ionic strengths. Minimum energy barriers calculated from collision theory as a function of nanoparticle concentration were utilized to make kinetic predictions. All in all, these studies suggest that choosing the appropriate gold nanostar dimension is crucial to fully understanding and accurately predicting the stability of anisotropic nanostructures such as gold nanostars; i.e., whether the nanostructures remain stable and can be used reproducibly, or whether they aggregate and exhibit inconsistent results. Thus, the present work provides a deeper understanding of internanoparticle interactions in solution and is expected to lead to more consistent and efficient analytical and bioanalytical applications of these important materials in the future. Graphical abstract ᅟ.

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Section: Resultsmentioning

confidence: 99%

How to accurately predict solution-phase gold nanostar stability

Phan

Haes

2018

Anal Bioanal Chem

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“…In consequence, the resulting positively charged M n+ can oxidize organic molecules. Although there have been no reports on the plasmon photocatalysis of Rh and Ru, some similar results about plasmon photocatalysis over titania system have been reported, such as Ag/TiO 2 , Au/TiO 2 and Pt/TiO 2 [17,[79][80][81]. Moreover, based on the DRS analysis it can be observed that Rh, Ru and Pt could slightly shift the light absorption edge of SrTiO 3 to near visible light region which could cause the enhancement of photoactivity under visible light irradiation.…”

Section: åàmentioning

confidence: 90%

TiO2/SrTiO3 and SrTiO3 microspheres decorated with Rh, Ru or Pt nanoparticles: Highly UV–vis responsible photoactivity and mechanism

Grabowska

Marchelek

Klimczuk

et al. 2017

Journal of Catalysis

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“…Figure 5 shows the X-ray diffraction (XRD) patterns of pristine TiO2, QDs and TiO2/QDs_15 composites. The peak diffraction observed at the 2θ values of 25, 37.8, 48.1, and 53.9° can be assigned to (101), (004), (200), and (105) crystallographic plane of anatase TiO2 with tetragonal crystal structure [31,43]. Three peaks at 2θ values of 26.5, 44.7, and 52.3° corresponding to the (112), (220), and (312) indices of the tetragonal crystal structure of AgInS2 QDs, respectively ( Figure 5a) [44].…”

Section: Photoluminescence Propertiesmentioning

confidence: 97%

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

et al. 2020

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The effect of type (AgInS 2 , SnS, CuS 2 , Bi 2 S 3 ) and amount (5, 10, 15 wt%) of quantum dots (QDs) on the surface properties and photocatalytic activity of QDs-sensitized TiO 2 composite, was investigated. AgInS 2 , SnS, CuS 2 , Bi 2 S 3 QDs were obtained by hot-injection, sonochemical, microwave, and hot-injection method, respectively. To characterize of as-prepared samples high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis spectroscopy and photoluminescence (PL) emission spectroscopy were applied. The size of AgInS 2 , SnS, CuS 2 , Bi 2 S 3 QDs were 12; 2-6; 2-3, and 1-2 nm, respectively. The QDs and QDs-sensitized TiO 2 composites obtained have been tested in toluene degradation under LEDs light irradiation (λ max = 415 nm and λ max = 375 nm). For pristine QDs the efficiency of toluene degradation increased in the order of AgInS 2 < Bi 2 S 3 < CuS < SnS under 375 nm and AgInS 2 < CuS < Bi 2 S 3 < SnS under 415 nm. In the presence of TiO 2 /SnS QDs_15% composite, 91% of toluene was degraded after 1 h of irradiation, and this efficiency was about 12 higher than that for pristine QDs under 375 nm. Generally, building the TiO 2 /AgInS 2 and TiO 2 /SnS exhibited higher photoactivity under 375 nm than the pristine TiO 2 and QDs which suggests a synergistic effect between QDs and TiO 2 matrix. Catalysts 2020, 10, 403 2 of 18 application of metal sulfides (M x S y ) for wide band semiconductors modification, because of their high charge separation efficiency and narrow band gaps, which possibly enable light harvesting at longer wavelengths [9]. Liu et al. studied the efficiency of AgInS 2 /TiO 2 heterostructures in 1,2-dichlorobenzene (o-DCB) degradation under visible light [10]. They observed that AgInS 2 /TiO 2 composites could expand the visible-light response range and greatly decreased the recombination of photogenerated electron−hole pairs in the composites. The degradation of o-DCB for the most active sample reaches about 50% after 8h of irradiation. Jang et al. prepared Ag-SnS-TiO 2 nanocomposite for methylene blue and rhodamine B degradation under simulated sunlight [11].The photoactivity of the produced photocatalysts was about 2-3 times higher than that of P25. Compared with bare TiO 2 the CuS/TiO 2 [12], CdS/TiO 2 [13-15], SnS/TiO 2 [16], Ag 2 S/TiO 2 [17,18], CuInS 2 /TiO 2 [19-21], Bi 2 S 3 /TiO 2 [22][23][24] nanocomposites present a significant improvement on photocatalytic reactions due to the decreasing recombination of electron-hole pairs and the broadened light absorption spectra. However, the metal sulfides commonly employed for TiO 2 modification have been used in nanoparticle sizes and not in quantum dots sizes. Further, it has been shown that the size of metal sulfides (MS) particles can have an impact on its physicochemical and optical properties. Recently, the literature data demonstrated that the decrease in particle size lowers the recombination of the electron-hole pair within the semiconductor particle. Quantum...

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The effect of gold shape and size on the properties and visible light-induced photoactivity of Au-TiO2

Cited by 91 publications

References 72 publications

How to accurately predict solution-phase gold nanostar stability

How to accurately predict solution-phase gold nanostar stability

TiO2/SrTiO3 and SrTiO3 microspheres decorated with Rh, Ru or Pt nanoparticles: Highly UV–vis responsible photoactivity and mechanism

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

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