3D Ag/ZnO microsphere SERS substrate with ultra-sensitive, recyclable and self-cleaning performances: application for rapid in site monitoring catalytic dye degradation and insight into the mechanism

Cheng, Ying; Wang, Wenzhong; Yao, Lizhen; Wang, Jun; Han, Hongsong; Zhu, Tianyu; Liang, Yujie; Fu, Junli; Wang, Yunan

doi:10.1016/j.colsurfa.2020.125507

Cited by 21 publications

(12 citation statements)

References 49 publications

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“…It is clear that the degradation ratio(calculated by Equation ( 1)) of MB increases from 59.3% to 91%, when the MB concentrations drop from 2 × 10 −5 to 1 × 10 −5 M, because photocatalyst active sites are occupied by excess MB molecules, which lead to the deactivation of the active sites and reduces the generation of active species [36,37]. Additionally, the obstruction of light reaching the nanoparticles may occur resulting from the increased density of MB molecules [22]. When the MB concentrations further decreases to 8 × 10 −6 and 5 × 10 −6 M, the degradation ratios of MB, as expected, reduce to 83.8% and 85.5%, due to the lower MB concentration, resulting in a lower probability of reaction with the rapid generation of active species [38].…”

Section: Effect Of Initial Concentrationmentioning

confidence: 99%

“…Many research groups demonstrated the beneficial effects of the integration of noble metals in TiO 2 -based photocatalysts, such as Au, Ag, Pt and Pd [16][17][18][19][20][21]. Cheng et al [22] fabricated 3D Ag/ZnO bifunctional composite, acting as a SERS-active substrate and photocatalyst, to detect and degrade organic dye pollutant. Wang et al [23] prepared Ag/GO/TiO 2 nanorod arrays that displayed excellent photocatalytic properties and SERS sensitivities.…”

Section: Introductionmentioning

confidence: 99%

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Silver@mesoporous Anatase TiO2 Core-Shell Nanoparticles and Their Application in Photocatalysis and SERS Sensing

et al. 2022

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Nanostructured noble metal-semiconductor materials have been attracting increasing attention because of their broad application in the field of environmental remediation, sensing and photocatalysis. In this study, a facile approach for fabricating silver@mesoporousanataseTiO2 (Ag@mTiO2) core-shell nanoparticles employing sol-gel and hydrothermal reaction is demonstrated. The Ag@mTiO2nanoparticles display excellent surface-enhanced Raman scattering (SERS) sensitivity and they can detect the methylene blue (MB) molecules with the concentration of as low as 10−8 M. They also exhibit outstanding photocatalytic activity compared with mTiO2, due to the efficient separation and recombination restrain of electron–hole pairs under ultraviolet light. The Ag@mTiO2nanoparticles also present good stability and they can achieve recyclable photocatalytic degradation experiments for five times without loss of activity. Subsequently, the nanoparticles with dual functions were successfully used to in situ monitor the photodegradation process of MB aqueous solution. These results, demonstrating the multifunctional Ag@mTiO2 nanoparticles, hold promising applications for simultaneous SERS analysis and the removal of dye pollutants in environmental field.

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Section: Effect Of Initial Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Silver@mesoporous Anatase TiO2 Core-Shell Nanoparticles and Their Application in Photocatalysis and SERS Sensing

et al. 2022

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“…As a novel sensing technique, surface-enhanced Raman scattering (SERS) has received much attention in recent years due to its ultra-sensitiveness (concentration ~10 −14 M) to detect organic molecules such as rhodamine 6G (R6G), picric acid, crystal violet, among others [1][2][3][4][5][6]. Many SERS substrates have been proposed to enhance the Raman signals with metal nanoparticles (NPs) fixed over surface of cellulose fibers [1], metals [2], polymers [3], or metal-oxide nanostructures [4][5][6], with an extensive variety of shapes and sizes to take advantage of the higher surface-volume ratio. They are usually made in a two-step process, harmonizing chemical and physical methods to successfully synthesize a high-surface template first, and next decorate it with metal NPs.…”

Section: Introductionmentioning

confidence: 99%

“…They are usually made in a two-step process, harmonizing chemical and physical methods to successfully synthesize a high-surface template first, and next decorate it with metal NPs. Some combinations observed are hydrothermal in the first step and then use chemical reduction in the second step [4], such as hydrothermal and in situ solution crystal growth [5], hydrothermal/magnetron sputtering [6], and solvothermal/Sn (II) ion activation [7]. However, these methodologies imply high costs, long synthesis times, high temperatures, complicated multi-steps, and the use of seed-layers, surfactants, and toxic reducing agents that are unfriendly to the environment.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Yanjun Liu et al detected R6G, phenol red, dopamine and glucose molecules at concentrations as low as 10 −12 M, 10 −11 M, 10 −12 M, and 10 −11 M, respectively, by SERS measurements on template-free Ag NPs-decorated ZnO microspheres (Ag/ZnO MSs) [10]. Ag/ZnO MSs-based SERS substrates are gaining more interest due to its highly sensitive capabilities, associated with recyclable and self-cleaning, suggesting potential applications as a multifunctional platform to rapid in situ monitoring photocatalytic degradation of organic pollutants in water [5,10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Ag Photodeposition Conditions over SERS Intensity of Ag/ZnO Microspheres for Nanomolar Detection of Methylene Blue

et al. 2021

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Surface enhanced Raman spectroscopy (SERS) is considered a versatile and multifunctional technique with the ability to detect molecules of different species at very low molar concentration. In this work, hierarchical ZnO microspheres (ZnO MSs) and Ag/ZnO MSs were fabricated and decorated by hydrothermal and photodeposition methods, respectively. For Ag deposition, precursor molar concentration (1.9 and 9.8 mM) and UV irradiation time (5, 15, and 30 min) were evaluated by SEM, TEM, X-ray diffraction and Raman spectroscopy. X-ray diffraction showed a peak at 37.9° corresponding to the (111) plane of Ag, whose intensity increases as precursor concentration and UV irradiation time increases. SEM images confirmed the formation of ZnO MSs (from 2.5 to 4.5 µm) building by radially aligned two-dimensional ZnO nanosheets with thicknesses below 30 nm. The Raman spectra of Ag/ZnO MSs exhibited a vibration mode at 486 cm−1 which can be directly associated to Ag deposition on ZnO MSs surface. The performance of SERS substrate was evaluated using rhodamine 6G. The SERS substrate grown at 9.8 mM during 30 min showed the best SERS activity and the ability to detect methylene blue at 10−9 M.

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In situ and Operando Spectroscopies in Photocatalysis: Powerful Techniques for a Better Understanding of the Performance and the Reaction Mechanism

et al. 2022

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In photocatalysis, a set of elemental steps are involved together at different time scales to govern the overall efficiency of the process. These steps are divided as follow: 1) photon absorption and excitation (in femtoseconds), 2) charge separation (femto-to picoseconds), 3) charge carrier diffusion/transport (nano-to microseconds), 4 & 5) reactant activation/conversion and mass transfer (micro-to milliseconds). The identification and quantification of these steps, using the appropriate tool/technique, can provide the guidelines to emphasize the most influential key parameter that improve the overall efficiency and to develop the "photocatalyst by design" concept. In this review, the identification/quantification of reactant activation/conversion and mass transfer (steps 4&5) is discussed in details using the in-situ/operando techniques, especially the infrared (IR), Raman and XAS spectroscopy. The use of these techniques in photocatalysis was highlighted by the most recent and conclusive case studies which allow a better characterization of the active site and revealing the reaction pathways in order to establish a structureperformance relationship. In each case study, the reaction conditions and the reactor design for photocatalysis (pressure, temperature, concentration, etc.) were thoroughly discussed. In the last part, some examples in the use of time-resolved techniques (time-resolved FTIR, photoluminescence and transient absorption) are also presented as an author's guideline to study the elemental steps in photocatalysis at shorter time scale (ps, ns and µs).

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3D Ag/ZnO microsphere SERS substrate with ultra-sensitive, recyclable and self-cleaning performances: application for rapid in site monitoring catalytic dye degradation and insight into the mechanism

Cited by 21 publications

References 49 publications

Silver@mesoporous Anatase TiO2 Core-Shell Nanoparticles and Their Application in Photocatalysis and SERS Sensing

Silver@mesoporous Anatase TiO2 Core-Shell Nanoparticles and Their Application in Photocatalysis and SERS Sensing

Influence of Ag Photodeposition Conditions over SERS Intensity of Ag/ZnO Microspheres for Nanomolar Detection of Methylene Blue

In situ and Operando Spectroscopies in Photocatalysis: Powerful Techniques for a Better Understanding of the Performance and the Reaction Mechanism

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