Biosensors-Basel
·
2023
·Vol. 13
·期 8
·766
·
IF 5.4
Xiaoxiao Zhou,Shouhui Chen,Yi Pan,Yuanfeng Wang,Naifeng Xu,Yanwen Xue,Xinlin Wei,Ying Lu
In order to improve the detection performance of surface-enhanced Raman scattering (SERS), a low-cost Au@Ag nanorods (Au@Ag NRs) substrate with a good SERS enhancement effect was developed and applied to the detection of malachite green (MG) in aquaculture water and crayfish. By comparing the SERS signal enhancement effect of five kinds of Au@Ag NRs substrates with different silver layer thickness on 4-mercaptobenzoic acid (4-MBA) solution, it was found that the substrate prepared with 100 µL AgNO3had the smallest aspect ratio (3.27) and the thickest Ag layer (4.1 nm). However, it showed a good signal enhancement effect, and achieved a detection of 4-MBA as low as 1 × 10−11M, which was 8.7 times higher than that of the AuNRs substrate. In addition, the Au@Ag NRs substrate developed in this study was used for SRES detection of MG in crayfish; its detection limit was 1.58 × 10−9M. The developed Au@Ag NRs sensor had the advantages of stable SERS signal, uniform size and low cost, which provided a new tool for SERS signal enhancement and highly sensitive SERS detection method development.Keywords:Au@Ag nanorods substrate;surface-enhanced Raman scattering (SERS);malachite green
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Surfaces and Interfaces
·
2023
·
IF 6.2
Wen Zhang,Ziqian Shi,Niu Pan,Pengfei Wu,Xiaoyang Fan,Chao Qu,Hongyan Xi,Tingting You,Yukun Gao,Penggang Yin
Plasmon-mediated chemical reactions (PMCRs) are considered as promising methods for promoting photo-driven chemical reactions by using solar energy. In this work, metal–organic frameworks (MOFs; HKUST-1) /Ag NPs substrate was feasibly prepared by electrodeposition method and electrostatic adsorption, and it was applied for in-situ monitoring of PMCRs from 4-nitrobenzenethiol (4-NBT) to 4, 4′-dimercaptoazobenzene (DMAB). By conducting in-situ surface enhanced Raman spectroscopy (SERS), the HKUST-1/Ag NPs substrate was proved performing efficient localized surface plasmon resonance (LSPR) effect. Surprisingly, higher efficiency of plasmon catalytic reaction was observed comparing with traditional Ag substrate, which was benefited from the adsorption capacity and stabilization effect of HKUST-1. Thus, the reaction mechanism testified by using the high efficiency HKUST-1/Ag NPs substrate, and a novel route monitoring the plasmon catalytic reaction was further offered.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22877-22888
·
IF 3.925
Qiang Wang,Ying-Rong Wang,Wen-Jing Wei,Hai-Lan Lin,Ping-Jian Yang
Nano-silver (Ag-NPs) has been widely applied due to its antibacterial properties, but issues remain with its toxicity. Although most Ag-NPs in the environment come from artificial import, the natural generation of Ag-NPs has also been discovered. In the present study, the particle characteristics and stability of naturally generated Ag-NPs, which might be different in migration, transformation, and bioavailability of artificially introduced Ag-NPs, were investigated and discussed in detail. Cloud point extraction and single-particle inductively coupled plasma mass spectrometry were used in combination to quantitatively analyze the naturally generated Ag-NPs and further explore their particle characteristics and stability. The results showed that a conversion behavior of Ag+ to Ag-NPs existed in environmental soil, and the particle sizes of the Ag-NPs were mainly distributed in the 30–40 nm range. It was found that oxygen, illumination, and humic acid could promote the natural generation of Ag-NPs but had different effects on the stability of Ag-NPs. Ag-NPs could be generated and stabilized under the combined action of fulvic acid and humus. This could become a meaningful basis to deeply explore the toxicological effects of Ag-NPs and control Ag-NP pollution from different sources and provide a way to discuss the role and influence of trace metals in geochemical transformations.
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Food Science and Human Wellness
·
2022
·
IF 8.022
Jing Li,Jia Xu,Yi Pan,Yongzhi Zhu,Yuanfeng Wang,Shouhui Chen,Xinlin Wei
Casein and α -lactalbumin ( α -LA) are the main allergens in cow's milk, which can affect the skin, respiratory system, and gastrointestinal tract, even cause anaphylactic shock. Developing a rapid and sensitive detection method of casein and α -LA is still pursued. Herein, a surface-enhanced Raman scattering based lateral flow assay (SERS-LFA) method for rapid and highly sensitive detection of milk allergens in food was established for effectively preventing allergic symptoms. [email protected] nanoparticles ( [email protected] NPs) were synthesized as SERS active substrate to prepare the antibody-modified SERS Probe and SERS-LFA strips toward casein and α -LA were assembled according to the sandwich mode. The detection results were calculated according to colorimetric and Raman signal. The introduction of SRES signal significantly increased the sensitivity of detection with the limit of detection (LOD) of 0.19 ng/mL and 1.74 pg/mL, and exhibited an excellent linear relationship within the range of 0.55–791.50 ng/mL and 0.1 pg/mL–100.0 ng/mL for casein and α -LA, respectively. Furthermore, SERS-LFA strips was highly specific with the recovery rates for corresponding 80.36 %–105.12 % and 85.73 %–118.22 % for casein and α -LA, respectively. Therefore, the SERS-LFA could be in great potential to develop a unique allergen detection method.
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Materials Today Communications
·
2022
·
IF 3.662
Zicheng He,Yunjie Lin,Mingfu Ye,Wenqing Zhu,Guochang Chen
The bismuth-containing semiconductors have emerged as promising materials for the degradation of organic pollutants and reduction of CO 2 . However, their potential applications in photocatalytic H 2 generation have not been explored clearly. Herein, bismuth-containing multicomponent photocatalyst Ag-BWV-y (where y represents the moles of Ag + in the initial reaction system) has been synthesized by a simple one-pot chemical method for photocatalytic H 2 generation. The element Ag is homogeneously distributed in as-prepared nanocomposite, and the band structure of Ag-BWV-y can be tuned by the dosage of Ag + ions. The optimized photocatalyst Ag-BWV-y (y = 0.15) shows a maximum H 2 evolution rate of 652 μmol h −1 g −1 , which is about 5.6-fold that of undoped sample. The narrow band gap of Ag-BVW-0.15 favors the photocatalytic activity in promoting H 2 production.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 19
·11197
·
IF 6.208
Xiaoxiao He,Xiaohong Ma,Yujun Yang,Xi Hu,Teng Wang,Shiyue Chen,Xiang Mao
In this work, we firstly report the preparation of heterogeneously assembled structures Au-Ag nanoclusters (NCs) as good drug carriers with high loading performance and biocompatible capability. As glutathione-protected Au and Ag clusters self-assembled into porous Au-Ag NCs, the size value is about 1.358 (±0.05) nm. The morphology characterization revealed that the diameter of Au-Ag NCs is approximately 120 nm, as well as the corresponding potential ability in loading performance of the metal cluster triggered-assembling process. Compared with individual components, the stability and loading performance of heterogeneous Au-Ag NCs were improved and exhibit that the relative biocompatibility was enhanced. The exact information about this is that cell viability was approximately to 98% when cells were incubated with 100 µg mL−1particle solution for 3 days. The drug release of Adriamycin from Au-Ag NCs was carried out in PBS at pH = 7.4 and 5.8, respectively. By simulating in vivo and tumor microenvironment, the release efficiency could reach over 65% at pH = 5.8 but less than 30% at pH = 7.2. Using an ultrasound field as external environment can accelerate the assembling process while metal clusters triggered assembling Au-Ag NCs. The size and morphology of the assembled Au-Ag NCs can be controlled by using different power parameters (8 W, 13 W, 18 W) under ambient atmosphere. Overall, a novel approach is exhibited, which conveys assembling work for metal clusters triggers into heterogeneous structures with porous characteristic. Its existing properties such as water-solubility, stability, low toxicity and capsulation can be considered as dependable agents in various biomedical applications and drug carriers in immunotherapies.Keywords:Au-Ag NCs;heterogeneous structures;assembling;drug carriers;biocompatibility
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22778-22785
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IF 3.925
Xiaozhi Li,Jutao Qiao,Dan Luo,Siyi Xu,Yuefeng Liu,Hao Liu
In this study, Ni nanoparticles were grown on a silver-coated nylon yarn (SCNY) surface by electrochemical deposition to prepare SCNY@Ni. The hierarchical Ni–Ag nanostructure promoted their synergistic effect, which enhanced the electrocatalytic behavior of glucose oxidation. The test result of SCNY@Ni showed its high sensitivity (115.26 μA mM−1 cm−2 and 67.37 μA mM−1 cm−2) with a wide linear response (from 2 μM to 1 mM and from 1 mM to 22 mM) of glucose con-centration range, a low detection limit (LOD) of 2 μM, fast response time (3 s), and good selectivity for glucose determination in the presence of sucrose (SU), aceta-mino phenol (AP), D-fructose (D-Fru), ascorbic acid (AA), dopamine (DA), hydro-quinone (HQ) and uric acid (UA) as potential interference species. Also, SCNY@Ni exhibited excellent stability, repeatability, reproducibility and flexibility. It has good prospects for large-scale production.
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LANGMUIR
·
2022
·
IF 4.331
Rong Chang,Tao Wang,Qian Liu,Jun Tang,Dongling Wu
Flexible surface-enhanced Raman scattering (SERS) substrates have become one of the research hot spots due to the facile sampling by swabbing or wrapping on rough surfaces and the sensitive and nondestructive detection of contaminants. In this work, we proposed a simple and fast in situ reduction method to prepare Ag nanoparticles (Ag NPs) composited agar hydrogel (Ag NPs@Agar) flexible SERS substrate. Owing to the three-dimensional (3D) structure, good hydrophilicity and adsorption of the agar hydrogel, Ag NPs were grown uniformly in the 3D cross-linked structure. The distribution density of Ag NPs was further increased by the volume shrinkage when the hydrogel was dried in air. This high density and uniformly distribution of Ag NPs produced a large number of highly active SERS regions. In addition, the sensitivity of Ag NPs@Agar was further improved with the assistance of hydrophilic agar gel, which can trap the probe molecules into highly active SERS areas. The SERS results showed that the substrate can be used to detect dye molecules (rhodamine 6G), the minimum detectable concentration was 10–15 M, the relative standard deviation tested at 18 different positions was only 7.58%, and the intensity of the characteristic peak at 611 cm–1 decreased only about 10% after 49 days of storage, demonstrating the superior stability. Moreover, the Ag NPs@Agar substrate also could successfully achieve the micro-trace detection of melamine and sodium penicillin G in Xinjiang specialty camel milk powder. The above available results show that the prepared flexible Ag NPs@Agar SERS substrates possess potentials for the illegal additives and antibiotics in food safety analysis.
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RSC Advances
·
2022
·Vol. 12
·期 46
·30113-30119
·
IF 4.036
Ling Zhu,Lujia Shi,Yiping Tan,Huaiyin Zhang,Jiacheng Yin,Chang Xu,Danlian Wu,Yunsu Ma
In this study, a sensitive ratiometric fluorescent nanosensor was constructed using a facile one-pot method by encapsulating carbon dots (CDs) and cadmium telluride quantum dots (CdTe QDs) into the pore cavities of a metal–organic framework (ZIF-8). In this nanosensor (CD/CdTe QD@ZIF-8), the fluorescence attributed to CdTe QDs was quenched by silver ions (Ag+), and the fluorescence intensity of CDs did not change. The introduction of ZIF-8 into the system can not only adsorb Ag+ but also easily separate CDs and CdTe QDs from the matrix. The developed CD/CdTe QD@ZIF-8 composite used as a ratiometric fluorescent probe exhibited high sensitivity and selectivity towards Ag+. The working linear range was 0.1–20 μM with a limit of detection (LOD) of 1.49 nM. Finally, the proposed nanosensor was applied to determine Ag+ in lake water with satisfactory results.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Chaochao Gao,Wen Yu,Minghao Du,Bingxuan Zhu,Wanbao Wu,Yihong Liang,Dong Wu,Baoyu Wang,Mi Wang,Jiaheng Zhang
The development of graphene conductive inks with a high conductivity and dispersion stability in water poses considerable challenges. Herein, a highly conductive Ag/carbon quantum dots (CQDs)/graphene (G) composite with good dispersity and stability in water was prepared for the first time through the in situ photoreduction of AgNO3 and deposition of Ag onto graphene nanosheets obtained via CQD-assisted liquid-phase exfoliation. Ag nanoparticles with an average size of ∼1.88 nm were uniformly dispersed on graphene nanosheets. The Ag/CQDs/G composite exhibited good dispersity and stability in water for 30 days. The formation mechanism of the Ag/CQDs/G composites was also discussed. CQDs played a vital role in coordinating with Ag+ and reducing it under visible light conditions. The addition of only 1.58 wt % of Ag NPs to the CQDs/G film resulted in a significant decrease in the electrical resistivity by approximately 89.5%, reaching a value of 0.054 Ω cm for a 40 μm thick Ag/CQDs/G film. A low resistivity of 2.15 × 10–3 Ω cm for the Ag/CQDs/G film was achieved after rolling compression with a compression ratio of 78%. The Ag/CQDs/G film exhibited good conductivity and durability when bent, rolled, or twisted. Moreover, the resistivity of the film displayed a slight deviation after 5000 bending cycles, indicating its outstanding stability. This study provides an efficient strategy for preparing graphene-based conductive composites with good dispersibility and stability in water as well as novel high-performance conductive inks for application in flexible printed electronics.
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MOLECULES
·
2022
·Vol. 27
·期 12
·3939
·
IF 4.927
Yazhou Qin,Fan Mo,Sen Yao,Yuanzhao Wu,Yingsheng He,Weixuan Yao
Porous noble metal nanomaterials have attracted extensive attention due to their high specific surface area and surface plasmon resonance effect. However, it is difficult to form porous structures due to the high mobility and low reduction potential of noble metal precursors. In this article, we developed a facile method for preparing porous Ag with a controllable structure at room temperature. Two kinds of Ag crystals with different porous structures were successfully prepared by using AgCl cubes as sacrificial templates. Through the galvanic replacement reaction of Zn and AgCl, Ag crystals with a sponge-like porous structure were successfully prepared. Additionally, using NaBH4as the reducing agent, we prepared granular porous Ag cubes by optimizing the amount of reducing agent. Both the sponge-like and granular porous Ag cubes have clean and accessible surfaces. In addition, we used the prepared two porous Ag cubes as substrate materials for SERS detection of five kinds of methamphetamine analogs. The experimental results show that the enhancement effect of granular porous Ag is better than that of sponge-like porous Ag. Furthermore, we probed the hot spot distribution of granular porous Ag by Raman mapping. By using granular porous Ag as the substrate material, we have achieved trace detection of 5 kinds of methamphetamine analogs including Ephedrine, Amphetamine, N-Methyl-1-(benzofuran-5-yl)propan-2-amine (5-MAPB), N-Methyl-1-(4-methoxyphenyl)propan-2-amine (PMMA) and N-Methyl-1-(4-fluorophenyl)propan-2-amine (4-FMA). Furthermore, to achieve qualitative differentiation of analogs with similar structures we performed density functional theoretical (DFT) calculations on the Raman spectra of the above analogs. The DFT calculations provided the vibrational frequencies, Raman activities, and normal mode assignment for each analog, enabling the qualitative differentiation of the above analogs.Keywords:Ag crystal;methamphetamine;SERS;porous structure
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Hongji Li,Junfu Wang,Xiyue Wang,Haochen Yu,Linjing Ji,Tianyu Zhou,Chunbo Liu,Guangbo Che,Dandan Wang
In this test, the eggshell membrane (ESM) is selected as the support membrane for the biocompatibility and anchors CNTs on the surface to increase the mechanical properties. Then Ag NPs are decorated on CNTs-ESM substrate as SERS substrate by twice in-situ reduction. Finally, a layer of imprinted polymers is coated on the surface of the substrate to synthesize the imprinted membrane for selective detection of spiramycin. It is exhibited from the characteristic results that the CNTs significantly increase the mechanical properties and the detection sensitivity, simultaneously. When the concentration of SP changes between 10 -6 ∼ 10 -11 M, there is a linear relationship between SERS intensity and SP concentration. The detection limit is 10 -11 M, and the correlation coefficient R 2 is 0.9864. The SERS imprinted membrane can be applied into the detection of antibiotics in practical sample, which broadens the research field of antibiotics detection.
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