Controlled preparation of Ag nanoparticle films by a modified photocatalytic method on TiO2 films with Ag seeds for surface-enhanced Raman scattering

Fu, Xin; Pan, Lujun; Li, Shuai; Wang, Qiao; Qin, Jun; Huang, Yingying

doi:10.1016/j.apsusc.2015.12.046

Cited by 15 publications

(6 citation statements)

References 36 publications

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“…The XRD patterns of the PTR, RTP, and PRT samples shown in Figure a exhibit diffraction peaks at 2θ values of 25.3, 37.8, 48.1, 54.0, 55.0, 62.9, 68.9, 70.4, and 75.2°, which are attributed to anatase TiO 2 and correspond to the (101), (004), (200), (105), (211), (204), (116), (220), and (215) planes, respectively (PDF card 21-1272, JCPDS). , The high dispersion and low concentration of Pt and RuO 2 in the sample could be the reason for the absence of their characteristic peaks in the patterns. , The characteristic diffraction peaks remained unchanged in all samples, indicating that NaBH 4 treatment did not alter the crystal form of TiO 2 . The Raman spectra of all samples (Figure b) show four peaks at approximately 144, 399, 516, and 639 cm –1 , which match the standard Raman bands corresponding to the E g (1), B 1g (1), A 1g + B 1g (2), and E g (2) modes, respectively, of anatase TiO 2 . , Based on these results, the samples prepared via the method used in this study are composed of anatase TiO 2 .…”

Section: Resultssupporting

confidence: 60%

“…The Raman spectra of all samples (Figure 2b) show four peaks at approximately 144, 399, 516, and 639 cm −1 , which match the standard Raman bands corresponding to the E g (1), B 1g (1), A 1g + B 1g (2), and E g (2) modes, respectively, of anatase TiO 2 . 31,32 Based on these results, the samples prepared via the method used in this study are composed of anatase TiO 2 .…”

Section: Structure and Morphologymentioning

confidence: 99%

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Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Li,

Zhu,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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The reaction efficiency of TiO 2 -based photocatalysts can be improved through the effective utilization of light and separation of carriers, which can be achieved via material structure designing. Herein, the synthesis of a novel hollow flowerlike TiO 2 -based nanomaterial by regulating the positions of dual cocatalysts on a Janus surface is reported. The dual cocatalysts (RuO 2 and Pt NPs) with redox capability were selectively deposited on different surfaces (constructed Janus surface) of TiO 2 materials to achieve directional transfer and spatial separation of photogenerated charges. Furthermore, the presence of dual cocatalysts may reduce the activation energy necessary for the reaction, enable the catalytic reaction to progress in a favorable direction, and increase the catalyst capability. Additionally, hollow nanostructures significantly shorten the migration distance of photogenerated carriers, owing to their thin-shell structure, further improving the separation of electron−hole pairs and migration efficiency. The results indicate that the deposition positions of the dual cocatalysts significantly affect the H 2 -evolution rate. Further studies reveal that macromolecule OH − exhibits a lower probability of entering the inner surface of the catalyst to participate in the reaction, whereas micromolecule H + demonstrates a higher probability of entering the inner surface of the catalyst, leading to differences in catalyst activity. Among the analyzed samples, PTR demonstrates the most notable H 2 -evolution rate, reaching 4,024 μmol g −1 h −1 , which is higher than those of pure TiO 2 and RTP by 60.96-and 1.22-fold, respectively. Furthermore, the mechanism of the charge migration pathway was analyzed via ultraviolet photoelectron spectroscopy, Mott−Schottky plots, and ultraviolet− visible diffusive reflectance spectroscopy. Catalyst activity increased substantially under illumination owing to the synergy between the special hollow Janus structure and the spatially separated dual cocatalysts.

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Section: Resultssupporting

confidence: 60%

Section: Structure and Morphologymentioning

confidence: 99%

Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Li,

Zhu,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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“…Compared to previous works mentioned in Introduction, the EF seems not to be excellent. However, for an easy-fabricated HTS–SERS substrate, − which further realizes the automatic droplet separation function, the EF is reasonable and fully promising.…”

Section: Resultsmentioning

confidence: 99%

Single-Step Fabrication of High-Throughput Surface-Enhanced Raman Scattering Substrates

Zeng

Gao

et al. 2018

ACS Appl. Mater. Interfaces

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The combination of surface-enhanced Raman scattering (SERS) with high-throughput screening (HTS) has significant importance for highly sensitive and massive workload assays. Although fabrication of HTS-SERS substrates can be achieved by several methods, the high cost as well as large-equipment dependence limit their applications. Here, we report a simple method to fabricate HTS-SERS substrates within one-step process. The HTS-SERS substrate is fabricated by simply UV-irradiating a fluoroalkylsilane (FAS)-modified liquid-repellent TiO surface in AgNO solution through a photomask. Owing to the photocatalytic nature of TiO, the UV irradiation simultaneously triggers the degradation of the attached FAS and the generation of liquid-adhesive Ag nanoparticles (NPs) on exposed area. A HTS-SERS substrate could be directly obtained after UV irradiation. The deposited Ag NPs evidently enhance Raman signals, and the significant difference between the wettability of exposed area and masked area enables fast formation of high-throughput liquid droplet arrays through a simple dragging solution process. The fabrication method is applicable to various substrate materials, to introduce additional functionalities. The photocatalytic activity of TiO also allows us to photobleach the residual analyte and Ag NPs after detection to recycle substrate. This single-step method is a highly promising candidate for the fabrication of HTS-SERS substrates.

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“…Fu at el. synthesized Ag NPs on the surface of TiO 2 film by a photocatalytic method for SERS detection [29]. Jing et al synthesized Ag NPs on a TiO 2 nanotube array for the detection of antibiotic residue in milk [30].…”

Section: Introductionmentioning

confidence: 99%

Ag Nanoparticles Synthesized on Black-Titanium Dioxide by Photocatalytic Method as Reusable Substrates of Surface-Enhanced Raman Spectroscopy

et al. 2022

Self Cite

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The construction of excellent surface-enhanced Raman spectroscopy (SERS) substrates needs rationally designed architectures of noble metals or semiconductors. In this study, Ag nanoparticles (NPs) are densely and uniformly synthesized on the surfaces of black-titanium dioxide (b-TiO2) NPs through a facile two-step photocatalysis method. The b-TiO2 improved the utilization efficiency of natural sunlight by the extension of light absorption from the ultraviolet (UV) to the visible (Vis) region. First, Ag seeds were densely grown in a short time on the surfaces of b-TiO2 NPs under the irradiation of UV light. Then, Ag NPs were grown slowly and uniformly from the Ag seeds under the irradiation of Vis light. The as-prepared Ag/b-TiO2 with high sensitivity achieved a limit of detection as low as 10−12 M for rhodamine 6G. Meanwhile, the substrate showed reusability due to the high photocatalytic ability of b-TiO2. The Ag/b-TiO2 SERS substrate achieves SERS detections of organic pollutants, such as hydroquinone, p-phenylenediamine, and terephthalic acid, indicating that this substrate possesses potential applications in food safety and environmental monitoring.

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Controlled preparation of Ag nanoparticle films by a modified photocatalytic method on TiO2 films with Ag seeds for surface-enhanced Raman scattering

Cited by 15 publications

References 36 publications

Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Single-Step Fabrication of High-Throughput Surface-Enhanced Raman Scattering Substrates

Ag Nanoparticles Synthesized on Black-Titanium Dioxide by Photocatalytic Method as Reusable Substrates of Surface-Enhanced Raman Spectroscopy

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Controlled preparation of Ag nanoparticle films by a modified photocatalytic method on TiO2 films with Ag seeds for surface-enhanced Raman scattering

Cited by 15 publications

References 36 publications

Janus Flower-Like Hollow TiO2 Photocatalysts Bearing RuO2 and Pt Nanoparticles for Solar-Light-Driven Catalytic H2 Evolution

Janus Flower-Like Hollow TiO2 Photocatalysts Bearing RuO2 and Pt Nanoparticles for Solar-Light-Driven Catalytic H2 Evolution

Single-Step Fabrication of High-Throughput Surface-Enhanced Raman Scattering Substrates

Ag Nanoparticles Synthesized on Black-Titanium Dioxide by Photocatalytic Method as Reusable Substrates of Surface-Enhanced Raman Spectroscopy

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Product

Resources

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Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution