scholarly journals Self-sustainable and recyclable ternary Au@Cu2O–Ag nanocomposites: application in ultrasensitive SERS detection and highly efficient photocatalysis of organic dyes under visible light

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Tong Wu ◽  
Hui Zheng ◽  
Yichuan Kou ◽  
Xinyue Su ◽  
Naveen Reddy Kadasala ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Dyes ◽  
Galvanic Replacement ◽  
Sers Substrates ◽  
Replacement Method ◽  
Wide Range ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Semiconductor Nanocomposites ◽  
Ag Ncs

AbstractTernary 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.

scholarly journals Enhanced Photocatalytic Activity of Semiconductor Nanocomposites Doped with Ag Nanoclusters Under UV and Visible Light

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 31 ◽  
Author(s):  
Jorge González-Rodríguez ◽  
Lucía Fernández ◽  
Yanina B. Bava ◽  
David Buceta ◽  
Carlos Vázquez-Vázquez ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Inductively Coupled Plasma ◽  
Emerging Contaminants ◽  
Low Cost ◽  
Optical Emission ◽  
Silver Nanoclusters ◽  
Emission Spectrometry ◽  
Wide Range ◽  
Semiconductor Nanocomposites

Emerging contaminants (ECs) represent a wide range of compounds, whose complete elimination from wastewaters by conventional methods is not always guaranteed, posing human and environmental risks. Advanced oxidation processes (AOPs), based on the generation of highly oxidizing species, lead to the degradation of these ECs. In this context, TiO2 and ZnO are the most widely used inorganic photocatalysts, mainly due to their low cost and wide availability. The addition of small amounts of nanoclusters may imply enhanced light absorption and an attenuation effect on the recombination rate of electron/hole pairs, resulting in improved photocatalytic activity. In this work, we propose the use of silver nanoclusters deposited on ZnO nanoparticles (ZnO–Ag), with a view to evaluating their catalytic activity under both ultraviolet A (UVA) and visible light, in order to reduce energetic requirements in prospective applications on a larger scale. The catalysts were produced and then characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and inductively coupled plasma-optical emission spectrometry (ICP-OES). As proof of concept of the capacity of photocatalysts doped with nanoclusters, experiments were carried out to remove the azo dye Orange II (OII). The results demonstrated the high photocatalytic efficiency achieved thanks to the incorporation of nanoclusters, especially evident in the experiments performed under white light.

scholarly journals Preparation of Graphene Oxide Decorated Fe3O4@SiO2Nanocomposites with Superior Adsorption Capacity and SERS Detection for Organic Dyes

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Song Yang ◽  
Tian Zeng ◽  
Yaling Li ◽  
Jun Liu ◽  
Qian Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Organic Dyes ◽  
Infrared Spectrometry ◽  
X Ray Diffraction ◽  
Fast Detection ◽  
Adsorption Behaviors ◽  
Transmission Electron ◽  
Surface Enhanced Raman ◽  
Detectable Concentration ◽  
Sers Detection

The fast detection and removal of organic dyes from contaminated water has become an urgent environmental issue due to their high toxicity, chemical stability, and low biodegradability. In this paper, we have developed graphene oxide decorated Fe3O4@SiO2(Fe3O4@SiO2-GO) as a novel adsorbent aiming at the rapid adsorption and trace analysis of organic dyes followed by surface enhanced Raman scattering (SERS). The structure and morphology of the nanocomposites were characterized by transmission electron microscopy (TEM), Fourier infrared spectrometry (FT-IR), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). The obtained nanocomposites were used to adsorb methylene blue (MB) in aqueous solution based onπ-πstacking interaction and electrostatic attraction between MB and GO, and the adsorption behaviors of MB were investigated. Moreover, the obtained nanocomposites with adsorbed dyes were separated from the solution and loaded with silver nanoparticles for SERS detection. These nanocomposites showed superior SERS sensitivity and the lowest detectable concentration was 1.0 × 10−7 M.

scholarly journals Shaped femtosecond laser induced photoreduction for highly controllable Au nanoparticles based on localized field enhancement and their SERS applications

Nanophotonics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 691-702 ◽  
Author(s):  
Chen Li ◽  
Jie Hu ◽  
Lan Jiang ◽  
Chenyang Xu ◽  
Xiaowei Li ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Field Enhancement ◽  
Localized Surface Plasmon ◽  
Silicon Substrates ◽  
Au Nps ◽  
Sers Substrates ◽  
Wide Range ◽  
Resonance Properties ◽  
Surface Enhanced Raman ◽  
Potential Applications

AbstractGold nanoparticles (Au NPs) have a wide range of applications because of their localized surface plasmon resonance properties. Femtosecond laser is considered to be an effective method for preparing Au NPs because of its characteristics of ultrashort irradiation periods and ultrahigh intensities. In this study, a novel method is proposed to produce an Au NP-attached substrate using the spatially and temporally shaped femtosecond laser. Laser-induced periodic surface structures (LIPSS) are designed to obtain the localized optical field enhancement, which leads to the femtosecond laser spatially reshaping, enabling the deposition of Au NPs by photoreduction on silicon substrates. The Au NPs prepared by this method exhibit morphological controllability and chemical stability, especially excellent spatial selectivity and uniformity, resulting in the tunable and stable surface-enhanced Raman scattering (SERS) applications. Also, the temporally shaped femtosecond pulses are introduced to further increase the enhancement factors of the SERS. This method successfully achieves the controllable morphology synthesis and selective deposition of Au NPs on the substrate simultaneously, which provides a promising candidate for SERS substrates fabrication, and holds potential applications in optoelectronics, such as molecular detection and biosensors.

Gold microsheets having nano/microporous structures fabricated by ultrasonic-assisted cyclic galvanic replacement

RSC Advances ◽  
2015 ◽  
Vol 5 (95) ◽  
pp. 78315-78323 ◽  
Author(s):  
P. Pienpinijtham ◽  
P. Sornprasit ◽  
K. Wongravee ◽  
C. Thammacharoen ◽  
S. Ekgasit
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Galvanic Replacement ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Ultrasonic Assisted ◽  
Enhanced Raman Scattering

Ultrasonic-assisted cyclic galvanic replacement is proposed to produce nano/microporous gold microsheets that can potentially be used as surface-enhanced Raman scattering (SERS) substrates.

Stable and Recyclable SERS Substrates Based on Au-Loaded PET Nanocomposite Superhydrophobic Surfaces

NANO ◽  
2018 ◽  
Vol 13 (05) ◽  
pp. 1850053 ◽  
Author(s):  
Hua-Xiang Chen ◽  
Yu-Ting Wang ◽  
Ting-Ting You ◽  
Jin Zhai ◽  
Peng-Gang Yin
Keyword(s):  
Hot Spots ◽  
Physical Vapor Deposition ◽  
Deposition Process ◽  
Superhydrophobic Surfaces ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering ◽  
Target Molecules

Novel surface-enhanced Raman scattering (SERS) substrates with stable and recyclable properties have been prepared by assembling gold nanoparticles-loaded PET (AuNPs/PET) nanocomposite superhydrophobic surfaces. After a physical vapor deposition process, the AuNPs/PET surfaces with vast plasmonic “hot spots” showed superhydrophobic properties, and it can hold target molecules droplets for rapid SERS detection. From blown off droplets and rinsed substrates with water after detection, we found that no probe molecules remained on the surfaces from Raman spectra. The prepared substrates were not contaminated in the detection process. Furthermore, the new SERS substrates were used for rapidly detecting droplets of crystal violet (CV) and the lowest detection concentration was about [Formula: see text] M. The as-prepared AuNPs/PET substrates also have good performance in terms of reproducibility and recyclability.

scholarly journals Distinctly Different Morphologies of Bimetallic Au-Ag Nanostructures and Their Application in Submicromolar SERS-Detection of Free Base Porphyrin

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2185
Author(s):  
Iveta Vilímová ◽  
Karolína Šišková
Keyword(s):  
Electronic Absorption Spectra ◽  
Free Base ◽  
Au Nps ◽  
Sers Substrates ◽  
Transmission Electron ◽  
Key Factor ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Application Potential ◽  
Enhanced Raman Scattering

Core-shell Au-Ag nanostructures (Au-AgNSs) are prepared by a seed-meditated growth, i.e., by a two-step process. The synthetic parameters greatly influence the morphologies of the final bimetallic Au-AgNSs, their stability and application potential as surface-enhanced Raman scattering (SERS) substrates. Direct comparison of several types of Au NPs possessing different surface species and serving as seeds in Au-AgNSs synthesis is the main objective of this paper. Borohydride-reduced (with varying stages of borohydride hydrolysis) and citrate-reduced Au NPs were prepared and used as seeds in Au-AgNSs generation. The order of reactants in seed-mediated growth procedure represents another key factor influencing the final Au-AgNSs characteristics. Electronic absorption spectra, dynamic light scattering, zeta potential measurements, energy dispersive spectroscopy and transmission electron microscopy were employed for Au-AgNSs characterization. Subsequently, possibilities and limitations of SERS-detection of unperturbed cationic porphyrin, 5,10,15,20-tetrakis(1-methyl-4-pyridyl)21H,23H-porphine (TMPyP), were investigated by using these Au-AgNSs. Only the free base (unperturbed) SERS spectral form of TMPyP is detected in all types of Au-AgNSs. It reports about a well-developed envelope of organic molecules around each Au-AgNSs which prevents metalation from occuring. TMPyP, attached via ionic interaction, was successfully detected in 10 nM concentration due to Au-AgNSs.

scholarly journals Silver Cluster Interactions with Tyrosine: Towards Amino Acid Detection

2022 ◽  
Vol 23 (2) ◽  
pp. 634
Author(s):  
Andrey A. Buglak ◽  
Alexei I. Kononov
Keyword(s):  
Density Functional ◽  
Silver Cluster ◽  
Surface Enhanced Raman Spectroscopy ◽  
Silver Nanoclusters ◽  
Functional Theory ◽  
The Density Functional Theory ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Ag Ncs

Tyrosine (Tyr) is involved in the synthesis of neurotransmitters, catecholamines, thyroid hormones, etc. Multiple pathologies are associated with impaired Tyr metabolism. Silver nanoclusters (Ag NCs) can be applied for colorimetric, fluorescent, and surface-enhanced Raman spectroscopy (SERS) detection of Tyr. However, one should understand the theoretical basics of interactions between Tyr and Ag NCs. Thereby, we calculated the binding energy (Eb) between Tyr and Agnq (n = 1–8; q = 0–2) NCs using the density functional theory (DFT) to find the most stable complexes. Since Ag NCs are synthesized on Tyr in an aqueous solution at pH 12.5, we studied Tyr−1, semiquinone (SemiQ−1), and Tyr−2. Ag32+ and Ag5+ had the highest Eb. The absorption spectrum of Tyr−2 significantly red-shifts with the attachment of Ag32+, which is prospective for colorimetric Tyr detection. Ag32+ interacts with all functional groups of SemiQ−1 (phenolate, amino group, and carboxylate), which makes detection of Tyr possible due to band emergence at 1324 cm−1 in the vibrational spectrum. The ground state charge transfer between Ag and carboxylate determines the band emergence at 1661 cm−1 in the Raman spectrum of the SemiQ−1–Ag32+ complex. Thus, the prospects of Tyr detection using silver nanoclusters were demonstrated.

The development of “fab-chips” as low-cost, sensitive surface-enhanced Raman spectroscopy (SERS) substrates for analytical applications

The Analyst ◽  
2015 ◽  
Vol 140 (3) ◽  
pp. 779-785 ◽  
Author(s):  
Ashley M. Robinson ◽  
Lili Zhao ◽  
Marwa Y. Shah Alam ◽  
Paridhi Bhandari ◽  
Scott G. Harroun ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Chemical Sensing ◽  
Low Cost ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Substrates ◽  
Sensing Applications ◽  
Wide Range ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Modification of metal-coated zari fabric chips with silver nanoparticles results in sensitive, affordable SERS substrates which are useful for a wide range of chemical sensing applications.

Gold-nanoparticle, functionalized-porous-polymer monolith enclosed in capillary for on-column SERS detection

2015 ◽  
Vol 7 (4) ◽  
pp. 1349-1357 ◽  
Author(s):  
Yingcheng Pan ◽  
Xuan Wang ◽  
Han Zhang ◽  
Yan Kang ◽  
Ting Wu ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Porous Polymer ◽  
Polymer Monoliths ◽  
Sers Substrates ◽  
Polymer Monolith ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering ◽  
Silica Capillary

Gold nanoparticles functionalized porous polymer monoliths were developed via on-site synthesis method and enclosed in silica capillary as sensitive, uniform, and stable surface-enhanced Raman scattering (SERS) substrates.

scholarly journals Ag–ZnO Nanocomposites Are Used for SERS Substrates and Promote the Coupling Reaction of PATP

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 922
Author(s):  
Liping Ma ◽  
Qijia Zhang ◽  
Jia Li ◽  
Xuemei Lu ◽  
Ce Gao ◽  
...  
Keyword(s):  
Chemical Reduction ◽  
Coupling Reaction ◽  
Semiconductor Materials ◽  
Sers Substrates ◽  
Electromagnetic Enhancement ◽  
Chemical Enhancement ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Semiconductor Nanocomposites ◽  
The Individual

Noble metal-semiconductor nanocomposites have received extensive attention in Surface Enhanced Raman Scattering (SERS) due to their unique properties. In this paper, the Ag–ZnO nanocomposites are prepared by hydrothermal growth and simple chemical reduction immersion. The synthesized nanocomposite material simultaneously integrates the individual enhancement effects of the two materials in the SERS, such as the electromagnetic enhancement of silver nanoparticles and the chemical enhancement of ZnO semiconductor materials. Using this substrate, Rhodamine 6G molecules with a concentration as low as 10−8 M can be detected, and the coupling reaction of PATP can be effectively promoted. The nanocomposite materials prepared by selecting appropriate semiconductor materials and metal materials combined, could be potentially applied, as SERS substrates, in certain catalytic reactions.

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