Self-sustainable and recyclable ternary Au@Cu2O-Ag nanocomposites: application in ultrasensitive SERS detection and highly efficient photocatalysis of organic dyes under visible light.
16 Mar 2021-Microsystems & Nanoengineering (Springer Science and Business Media LLC)-Vol. 7, Iss: 1, pp 23
TL;DR: In this paper, the effect of different amounts of Ag nanocrystals adsorbed on the surfaces of Au@Cu2O on the surface-enhanced Raman scattering (SERS) activity was investigated based on the SERS detection of 4-mercaptobenzoic acid (4-MBA) reporter molecules.
Abstract: Ternary noble metal-semiconductor nanocomposites (NCs) with core-shell-satellite nanostructures have received widespread attention due to their outstanding performance in detecting pollutants through surface-enhanced Raman scattering (SERS) and photodegradation of organic pollutants. In this work, ternary Au@Cu2O-Ag NCs were designed and prepared by a galvanic replacement method. The effect of different amounts of Ag nanocrystals adsorbed on the surfaces of Au@Cu2O on the SERS activity was investigated based on the SERS detection of 4-mercaptobenzoic acid (4-MBA) reporter molecules. Based on electromagnetic field simulations and photoluminescence (PL) results, a possible SERS enhancement mechanism was proposed and discussed. Moreover, Au@Cu2O-Ag NCs served as SERS substrates, and highly sensitive SERS detection of malachite green (MG) with a detection limit as low as 10-9 M was achieved. In addition, Au@Cu2O-Ag NCs were recycled due to their superior self-cleaning ability and could catalyze the degradation of MG driven by visible light. This work demonstrates a wide range of possibilities for the integration of recyclable SERS detection and photodegradation of organic dyes and promotes the development of green testing techniques.
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TL;DR: In this paper , the mass-produced and dense silver nanoparticles (AgNPs) were deposited on NiFe film to further optimize the SERS substrate by improving the method of oil-water interface self-assembly.
Abstract: Bimetallic nanostructures have attracted much attention to prepare surface-enhanced Raman spectrometry (SERS) substrate. In this study, the problem that magnetic target material was difficult to glow in magnetron sputtering was overcome and the ferro-nickel (NiFe) alloy was uniformly sputtered onto the cicada wing (CW) to make the substrate magnetic. Then, the mass-produced and dense silver nanoparticles (AgNPs) were deposited on NiFe film to further optimize the SERS substrate by improving the method of oil–water interface self-assembly. It was worth mentioning that with the deposition of AgNPs, the SERS intensity was significantly enhanced, and the substrate remained magnetic property, polarization-independence, excellent sensitivity and reproducibility. We also calculated the Raman spectra of probe molecule bound to Ag10 clusters to theoretically verify the performance changes of the substrate observed from experiment. The fabricated SERS substrate not only showed excellent Raman performance, but also had grand application potential in food safety detection.
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TL;DR: In this article, an aptamer (Apt) biosensor based on Fe3O4@Au nanocomposites (NCs) has been proposed for capture, surfaceenhanced Raman scattering (SERS) detection, and photothermal therapy (PTT) of S. aureus.
Abstract: Early and accurate diagnosis of pathogenic bacteria is essential to prevent further infection from spreading and multiplying. Herein, an aptamer (Apt) biosensor based on Fe3O4@Au nanocomposites (NCs) has been proposed for capture, surface-enhanced Raman scattering (SERS) detection, and photothermal therapy (PTT) of S. aureus. Fe3O4@Au NCs become SERS substrate and photothermal agent due to superior surface plasmon properties and photothermal ability, while the aptamer immobilized on surface of Fe3O4@Au NCs acts as a capture agent. The detection limit of optimized Fe3O4@Au-Apt aptasensor for S. aureus is 25 cfu/mL, and cell capture efficiency (CCE) is as high as 68%. Moreover, our Fe3O4@Au-Apt NCs have high photothermal conversion efficiency of 39.28%, which have been proven as an excellent photothermal agent. As verified by experiments, Fe3O4@Au-Apt aptasensor is not only a promising tool to detect and photothermally inactivated S. aureus in milk samples, but also exhibits negligible cytotoxicity and good biocompatibility. This work shows a promising multifunctional nano-platform, which has great potential in specific recognition, sensitive SERS detection and PTT of S. aureus.
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References
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TL;DR: This review examines the very recent advances in understanding the energy transfer process in plasmonic photocatalytic composites, describing both the theoretical basis of this process and experimental demonstrations.
Abstract: Among the many novel photocatalytic systems developed in very recent years, plasmonic photocatalytic composites possess great potential for use in applications and are one of the most intensively investigated photocatalytic systems owing to their high solar energy utilization efficiency. In these composites, the plasmonic nanoparticles (PNPs) efficiently absorb solar light through localized surface plasmon resonance and convert it into energetic electrons and holes in the nearby semiconductor. This energy transfer from PNPs to semiconductors plays a decisive role in the overall photocatalytic performance. Thus, the underlying physical mechanism is of great scientific and technological importance and is one of the hottest topics in the area of plasmonic photocatalysts. In this review, we examine the very recent advances in understanding the energy transfer process in plasmonic photocatalytic composites, describing both the theoretical basis of this process and experimental demonstrations. The factors that affect the energy transfer efficiencies and how to improve the efficiencies to yield better photocatalytic performance are also discussed. Furthermore, comparisons are made between the various energy transfer processes, emphasizing their limitations/benefits for efficient operation of plasmonic photocatalysts.
453 citations
TL;DR: The NIST X-ray photoelectron spectroscopy database has been updated to make the information more up-to-date and to make data searching and display more convenient and efficient for the user as mentioned in this paper.
Abstract: The National Institute of Standards and Technology (NIST) has made available the second version of the NIST X-ray photoelectron Spectroscopy Database. This paper reports on recent upgrades to the database to make the information more up-to-date and to make data searching and display more convenient and efficient for the user. Additional data are included in the database together with the capability to search using large chemical synonym lists, chemical formulae and other chemical classification schemes
390 citations
TL;DR: It is demonstrated that both oxygen incorporation and extraction processes can result in SERS enhancement, probably due to the enhanced charge-transfer resonance as well as exciton resonance arising from the judicious control of oxygen admission in semiconductor substrate.
Abstract: Semiconductor-based surface-enhanced Raman spectroscopy (SERS) substrates represent a new frontier in the field of SERS. However, the application of semiconductor materials as SERS substrates is still seriously impeded by their low SERS enhancement and inferior detection sensitivity, especially for non-metal-oxide semiconductor materials. Herein, we demonstrate a general oxygen incorporation-assisted strategy to magnify the semiconductor substrate–analyte molecule interaction, leading to significant increase in SERS enhancement for non-metal-oxide semiconductor materials. Oxygen incorporation in MoS2 even with trace concentrations can not only increase enhancement factors by up to 100,000-fold compared with oxygen-unincorporated samples but also endow MoS2 with low limit of detection below 10−7 M. Intriguingly, combined with the findings in previous studies, our present results indicate that both oxygen incorporation and extraction processes can result in SERS enhancement, probably due to the enhanced charge-transfer resonance as well as exciton resonance arising from the judicious control of oxygen admission in semiconductor substrate. The application of non-metal-oxide semiconductor materials as surface-enhanced Raman spectroscopy (SERS) substrates is impeded by their low SERS enhancement and detection sensitivity. Here, the authors develop a general oxygen incorporation strategy to magnify these parameters.
277 citations
TL;DR: A Cu2 O superstructure is constructed through a recrystallization-induced self-assembly strategy that exhibits an outstanding surface-enhanced Raman spectroscopy performance with the limit of detection as low as 10-9 mol L-1 and metal comparable enhancement factor (8 × 105 ) due to the synergetic effect of vacancies defect-facilitated charge-transfer process.
Abstract: A Cu2 O superstructure is constructed through a recrystallization-induced self-assembly strategy. Single Cu2 O superstructure particle exhibits an outstanding surface-enhanced Raman spectroscopy performance with the limit of detection as low as 10-9 mol L-1 and metal comparable enhancement factor (8 × 105 ) due to the synergetic effect of vacancies defect-facilitated charge-transfer process and copper vacancies defect-induced electrostatic adsorption.
265 citations
TL;DR: In this paper, the plasmonic properties of gold nanoparticles were exploited for the photocatalytic degradation of methylene blue under visible (700 nm) and ultraviolet (250-380 nm) light.
Abstract: Researchers in Japan have developed a visible-light-driven photocatalyst by exploiting the plasmonic properties of gold nanoparticles. Francesca Pincella and co-workers fabricated the photocatalyst by depositing a two-dimensional array of gold nanoparticles on top of a transparent conductive substrate of indium-tin-oxide-coated quartz. They then covered the gold nanoparticles with a monolayer of trimethoxyoctylsilane, which acts as an anchoring agent for the final layer of titania nanocrystals. Experiments involving the photocatalytic breakdown of methylene blue under visible (700 nm) and ultraviolet (250–380 nm) light suggest that operation is considerably superior to that of conventional titania photocatalysts. The performance in the visible region is attributed to two-photon absorption, which is boosted by the plasmon resonance and near-field enhancement of the gold nanoparticles.
202 citations