Improved SERS performance of single-crystalline TiO2 nanosheet arrays with coexposed {001} and {101} facets decorated with Ag nanoparticles

Yang, Lei; Wang, Weihua; Jiang, Haiyan; Zhang, Qianghua; Shan, Huihui; Zhang, Miao; Zhu, Kejia; Lv, Jianguo; He, Gang; Sun, Zhaoqi

doi:10.1016/j.snb.2016.09.162

Cited by 47 publications

(30 citation statements)

References 64 publications

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“…One strong adsorption in UV region can be assigned to the wide band‐gap of TiO 2 , and the other broad absorption in visible‐light region can be attributed to the SPR absorption of Ag. Furthermore, the different size of Ag NPs may result in the different location of absorption peaks for SPR . In this case, the wide absorption band from SPR is due to a wide range of particle size distribution of Ag NPs in the composites.…”

Section: Resultsmentioning

confidence: 99%

A multifunctional Ag/TiO₂/reduced graphene oxide with optimal surface‐enhanced Raman scattering and photocatalysis

et al. 2018

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A multifunctional Ag/TiO 2 /reduced graphene oxide (rGO) ternary nanocomposite was prepared by a one-step photochemical reaction with TiO 2 and Ag nanoparticles successively deposited on reduced graphene oxide. The structure, morphology, composition, optical, and photoelectrochemical properties of Ag/TiO 2 /rGO were investigated in detail. Meanwhile, the ternary nanocomposite possessed much higher adsorption capacity to organic dyes compared with bare TiO 2 and binary Ag/TiO 2 , which would help to its use for surface-enhanced Raman scattering detection and photocatalytic degradation. Due to the charge transfer between rGO and organic dyes and enhanced electromagnetic mechanism of Ag, Ag/TiO 2 / rGO nanocomposites as surface-enhanced Raman scattering substrates demonstrated dramatically improved sensitivity and good uniformity. The detection limit of rhodamine 6G (R6G) was as low as 10 −9 mol/L, and the relative standard deviation values of the intensities remained below 5%. Most importantly, the synergistic coupling effect of three components extended the photoresponse range and accelerated separation of the electron-hole pairs, leading to greatly improved photocatalytic activity under simulated sunlight. The maximum rate constant (k, 0.06243 min −1 ) of Ag/TiO 2 /rGO was 50 and four times higher than that of TiO 2 and Ag/TiO 2 , respectively. K E Y W O R D Sadsorption, graphene oxide, photocatalysis, surface-enhanced Raman scattering property, titanium oxide

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Section: Resultsmentioning

confidence: 99%

A multifunctional Ag/TiO₂/reduced graphene oxide with optimal surface‐enhanced Raman scattering and photocatalysis

et al. 2018

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“…Loading of noble metals over the surfaces of titanium dioxide is an important method to improve photocatalytic activity via improvement of separation of photogenerated charges [38], decreasing energy barriers for reactions such as hydrogen production from water [39], spillover to the photocatalyst [40], and prevention of deactivation [41]. Experimentally, metal loading is carried out via a number of techniques including photodeposition [42,43], chemical reduction [44], and sputtering [45]. The first of these methods was suggested to result in selective loading of metal nanoparticles over (101) surfaces of decahedral anatase nanoparticles.…”

Section: Metal-loaded Tio 2 Surfacesmentioning

confidence: 99%

Recent Advancements in the Understanding of the Surface Chemistry in TiO2 Photocatalysis

et al. 2020

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Surface chemistry plays a major role in photocatalytic and photoelectrochemical processes taking place with the participation of TiO2. The synthesis methods, surface characterizations, theoretical research methods, and hardware over the last decade generated opportunities for progress in the surface science of this photocatalyst. Very recently, attention was paid to the design of photocatalysts at the nanoscale level by adjusting the types of exposed surfaces and their ratio, the composition and the surface structure of nanoparticles, and that of individual surfaces. The current theoretical methods provide highly detailed designs that can be embodied experimentally. The present review article describes the progress in the surface science of TiO2 and TiO2-based photocatalysts obtained over the last three years. Such aspects including the properties of macro- and nano-scale surfaces, noble-metal-loaded surfaces, doping with Mg and S, intrinsic defects (oxygen vacancies), adsorption, and photoreactions are considered. The main focus of the article is on the anatase phase of TiO2.

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“…However, taking into account all the nanoplatforms, we do not find a linear relationship between any geometrical parameters of the AgNSs and the positions of the plasmon surface resonances, which suggests that other factors and/or their combination must be considered. For instance, Shan and coworkers have shown that visible laser excitation promotes transfer of hot electrons from the Ag particles to the TiO 2 coatings, reducing electron density on the metal and red shifting of LSPR absorption . Interestingly, the largest outflow of hot electrons from silver is observed for the 1.0AgW/Ti‐b sample fabricated under low‐intensity UV illumination.…”

Section: Resultsmentioning

confidence: 99%

“…An important parameter to evaluate effectivity of a SERS substrate is EF. We determined the average EF according to the following expression shown in the literature:

boldEF = ((), \frac{I_{SERS}}{I_{solid}}) ((), \frac{N_{solid}}{N_{SERS}}) .

…”

Section: Resultsmentioning

confidence: 99%

“…N SERS corresponds to the number of the probe molecules on the SERS substrate within a laser spot area, whereas N solid is the number of molecules in solid in a laser illumination volume. N solid was calculated according to the following formula: N solid = (S laser dρN A )/ M , where S laser is the area of the laser spot with a diameter of 0.72 μm, d is the penetration depth (approximately 0.92 μm), ρ is the density of 4‐MBA (1.5 g/cm 3 ), N A is the Avogadro constant, and M is the molecular weight (154.19 g/mol) of 4‐MBA . The total number of the adsorbed molecules in the laser spot ( N SERS ) was estimated assuming that an area occupied by one 4‐MBA molecule is 2 × 10 −7 μm 2 and Ag nanoparticles are roughly spheres.…”

Section: Resultsmentioning

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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Improved SERS performance of single-crystalline TiO2 nanosheet arrays with coexposed {001} and {101} facets decorated with Ag nanoparticles

Cited by 47 publications

References 64 publications

A multifunctional Ag/TiO₂/reduced graphene oxide with optimal surface‐enhanced Raman scattering and photocatalysis

A multifunctional Ag/TiO₂/reduced graphene oxide with optimal surface‐enhanced Raman scattering and photocatalysis

Recent Advancements in the Understanding of the Surface Chemistry in TiO2 Photocatalysis

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

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Improved SERS performance of single-crystalline TiO2 nanosheet arrays with coexposed {001} and {101} facets decorated with Ag nanoparticles

Cited by 47 publications

References 64 publications

A multifunctional Ag/TiO2/reduced graphene oxide with optimal surface‐enhanced Raman scattering and photocatalysis

A multifunctional Ag/TiO2/reduced graphene oxide with optimal surface‐enhanced Raman scattering and photocatalysis

Recent Advancements in the Understanding of the Surface Chemistry in TiO2 Photocatalysis

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

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Product

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A multifunctional Ag/TiO₂/reduced graphene oxide with optimal surface‐enhanced Raman scattering and photocatalysis

A multifunctional Ag/TiO₂/reduced graphene oxide with optimal surface‐enhanced Raman scattering and photocatalysis