MICROCHIMICA ACTA
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2024
·Vol. 191
·期 10
·1-10
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IF 5.3
Peng Sasa,Zhang Zhilong,Xin Mingwei,Liu Dongli
An innovative method is introduced based on the combination of label-free surface-enhanced Raman scattering with advanced multivariate analysis. This technique allows both quantitative and qualitative assessment of Salmonella typhimurium and Escherichia coli on eggshells. Using silver nanocubes embedded in polydimethylsiloxane, we consistently achieved Raman spectra of bacteria. The stability of the Ag NCs@PDMS substrate is confirmed using rhodamine 6G over 30 days under standard conditions. Principal component analysis (PCA) effectively distinguishes between S. typhimurium and E. coli spectra. Partial least squares regression (PLS) models were developed for quantitative determination of bacteria on egg surfaces, yielding accurate results with minimal error. The S. typhimurium model achieves R c 2 = 0.9563 and RMSEC = 0.601 in calibration, and R v 2 = 0.9113 and RMSEV = 0.907 in validation. Similarly, the E. coli model achieves R c 2 = 0.9877 and RMSEC = 0.322 in calibration, and R v 2 = 0.9606 and RMSEV = 0.579 in validation. Recoveries validate PLS predictions by inoculating egg surfaces with varying bacterial amounts. Our study demonstrates the feasibility of SERS-PLS for quantitative determination of S. typhimurium and E. coli on eggshells, promising enhanced food safety protocols. Graphical Abstract
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Zhilei Zhao,Mengyu Ren,Wenqi Zhang,Zikuo Chen,Lu Zhang,Xinquan Qu,Junling Shi,Weiwei Xia,Xiaoguang Xu,Ying Yang
In view of the serious harm and widespread pollution caused by deoxynivalenol (DON), it is crucial to quantify its presence in the food safety assessment process. Here, we designed a core-shell-satellite nano assembly structure as a probe, composed of an anisotropic AuNR@Ag core, an ultra-thin SiO 2 layer and a high surface coverage AuNPs satellites, which showed outstanding SERS activity and high stability. Anti-DON antibodies were modified on the surface of the prepared core-shell-satellite nano-assembly structure as SERS immunoprobe for DON specific detection using SERS-based lateral flow immunoassay (LFIA) with the advantages of simplicity, rapidity, and high sensitivity. Under optimal conditions, the detection limit for detecting DON using the SERS-LFIA method was 0.053 fg/mL, and the linear detection ranged from 0.1 fg/mL to 1 μg/mL. The SERS-LFIA strips based on AuNR@Ag@SiO 2 -AuNP nanostructures demonstrated the great potential for quick quantitative DON detection, providing a reference for trace detection of highly toxin mycotoxins.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Haiyin Zhan,Chenxu Li,Zixuan Cao,Ruiren Zhou,Simiao Zhang,Ziyu Guo,Qixing Zhou
Y 2 O 3 is a cost-effective and environmentally friendly wide-band gap photocatalyst with extensive application potential. However, its limited ability to be excited by visible light restricts its practical uses. In this study, we coupled the narrow bandgap semiconductor AgI with Y 2 O 3 to form a Z-scheme heterostructure , significantly promoting its photocatalytic degradation activity. Characterization and experimental results demonstrated the formation of Y-O-Ag bonds through coupling with AgI, leading to an increase in oxygen vacancies in Y 2 O 3 , which promotes the chemisorption of H 2 O and O 2 . The Y-O-Ag bond introduction promotes electron transfer , improves hole utilization, and boosts energy transfer efficiency, thus promoting the efficient generation of ·OH and 1 O 2 . The photocatalytic degradation rates of RhB and o-nitrophenol by 7.5% AgI/Y 2 O 3 were 26.5 and 4 times higher than those of pure Y 2 O 3 , respectively. This study provides theoretical support for the Z-scheme heterojunction to improve photocatalytic activity and offers efficient solutions and practical design ideas for sewage purification.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Jiwen Li,Yaqian Duan,Linlin Wang,Jingjun Ma
The poor light absorption and low carrier separation efficiency of Titanium dioxide (TiO 2 ) limit its further application. The introduction of plasma metal Ag have the potential to solve these drawbacks owing to its plasma resonance effect. Thus core-shell structure Ag@TiO 2 plasma photocatalysts was prepared by using facile reduction method in this work. More specifically, Ag@TiO 2 composite catalysts with different Ag loading amounts were prepared in the presence of surfactant PVP. Ag@TiO 2 demonstrates excellent light absorption performance and photoelectric separation efficiency compared with pure TiO 2 . As a result, it displays excellent performance of Cr(VI) reduction under visible light. The optimal composite catalysts Ag@TiO 2 –5P achieves exceptional visible-light-driven photocatalytic Cr(VI) reduction efficiency of 0.01416 min −1 that is 2.29 times greater than pure TiO 2 . To investigate the role of PVP, we also synthesized Ag@TiO 2 -5 without PVP. The experimental results show that although Ag@TiO 2 -5 Cr(VI) reduction performance is superior to pure TiO 2 , it significantly decreases compared with Ag@TiO 2 –5P. The results of TEM and optoelectronic testing show that agglomeration of Ag particles leads to a decrease in the photoelectric separation efficiency of Ag@TiO 2 -5. The smaller Ag particles provide more active sites and demonstrating a stronger overall local surface plasmon resonance (LSPR) effect. DMPO spin-trapping ESR spectra testing indicates that ∙O 2 − and ∙OH are the main reactive species. This research provides a potential strategy to prepare Ag-based plasma photocatalysts for environment protection.
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Carbon Energy
·
2024
·
IF 19.5
Zhi Cai,Mingyuan Xu,Yanhong Li,Xinyan Zhou,Kexin Yin,Lidong Li,Binbin Jia,Lin Guo,Hewei Zhao
The dynamic surface self-reconstruction behavior in local structure correlates with oxygen evolution reaction (OER) performance, which has become an effective strategy for constructing the catalytic active phase. However, it remains a challenge to understand the mechanisms of reconstruction and to accomplish it fast and deeply. Here, we reported a photo-promoted rapid reconstruction (PRR) process on Ag nanoparticle-loaded amorphous Ni-Fe hydroxide nanosheets on carbon cloth for enhanced OER. The photogenerated holes generated by Ag in conjunction with the anodic potential contributed to a thorough reconstruction of the amorphous substrate. The valence state of unsaturated coordinated Fe atoms, which serve as active sites, is significantly increased, while the corresponding crystalline substrate shows little change. The different structural evolutions of amorphous and crystalline substrates during reconstruction lead to diverse pathways of OER. This PRR utilizing loaded noble metal nanoparticles can accelerate the generation of active species in the substrate and increase the electrical conductivity, which provides a new inspiration to develop efficient catalysts via reconstruction strategies.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Huiling Li,Li Tian,Shuning Yang,Chao Li,Ruidan Li,Yujia Song,Yanjia Guo,Xuwen Li
To sensitively monitor trace-level of malathion (MAT) in vegetable samples, an ultrasensitive solid-state electrochemiluminescence (ECL) sensor was proposed based on TiO 2 @CdSe and Ru(bpy) 3 2+ @Ag NPs. In this system, the introduction of Ag NPs enhanced the initial ECL signal of Ru(bpy) 3 2+ - tripropylamine (TPrA). When TiO 2 @CdSe was introduced into the system, the ECL signal was further enhanced, which may be due to the synergistic effect of the two complexes. Based on the fact that the addition of MAT causes ECL strength to decrease, a ECL sensor for the ultrasensitive trace detection of MAT has been successfully established. Under the optimized conditions, a wide liner detection range of MAT concentrations from 4.0 × 10 −14 to 4.0 × 10 −9 mol L −1 and a low detection limit (S/N = 3) of 1.3 × 10 −14 mol L −1 were obtained. The ECL sensor has been applied to the detection of vegetable samples and satisfactory results were obtained.
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Chemosensors
·
2024
·Vol. 12
·期 9
·187
·
IF 3.7
Yuyu Peng,Chunyan Wang,Gen Li,Jianguo Cui,Yina Jiang,Xiwang Li,Zhengjie Wang,Xiaofeng Zhou
In this study, a MOF-199/Ag@Au SERS sensing structure was successfully synthesized by combining metal–organic frameworks (MOFs) with surface-enhanced Raman scattering (SERS) technology for the efficient detection of dopamine (DA), a biomarker for neurological diseases, in serum. Using electrochemical methods, a copper-based MOF (MOF-199) was synthesized in situ on copper substrates and further deposited with silver nanoparticles (AgNPs). Subsequently, gold nanoshells were encapsulated around these silver cores by in situ chemical deposition. This preparation process is simple, controllable, and inexpensive. Furthermore, a novel Azo reaction-based DA SERS method was proposed to detect 1 pM DA, which represents an improvement in sensitivity by two orders of magnitude compared to previous unlabeled SERS detection methods and by four orders of magnitude compared to another SERS approach proposed in this work. There was an excellent linear relationship (R2= 0.976) between the SERS signal at 1140 cm−1and the DA concentration (0.001 M~1 pM). The results indicate that the MOF-199/Ag@Au sensor structure can successfully achieve both the qualitative and quantitative detection of DA in serum, thus providing a robust technical basis for the application of SERS technology in the field of clinical neurological disease screening.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Tingting Hu,Xiaoyu Han,Haimei Zeng,Jihong Zhang,Jun Xie,Jianjun Han
Photocatalytic compound decomposition can be an effective protocol for the prominent and urgent solving of the environmental pollution and energy shortage problems. In-situ monitoring of the substance concentrations change during the process is of importance for understanding the decomposition process and final effects. In present research, a surface enhanced Raman spectroscopy (SERS) fiber probe based photocatalyst decomposition monitoring method is proposed. Ag nanoparticles and Ag 3 PO 4 microcube composites were synthesized by ion exchange and subsequent ion reduction method, and then they were coated on silica fiber end-tip for probe fabrication. The microstructures, elements distribution, and morphologies analysis confirm the formation of dense Ag nanoparticles with 30 nm diameter on 1 μm edge length Ag 3 PO 4 cubes. The localized surface plasmon resonance (LSPR) induced absorption peak of Ag nanoparticles is found at 318 nm, along with the band-gap absorption of Ag 3 PO 4 cubes. The Ag nanoparticles and Ag 3 PO 4 composites are homogeneously distributed on the fiber end-tip surface. The fiber probes show the lowest detection limit of 10 −14 M using crystal violet analyte, and as high as 5.3 × 10 11 calculated enhancement factor, due to the strong LSPR induced electrical field from the densely distributed Ag nanoparticles on Ag 3 PO 4 microcubes surface. Furthermore, the linear relationship between analyte concentrations and SERS intensities indicates a potential for quantitative analysis. The analytes crystal violet and 4-aminothiophenol can be photodegraded under UV and visible light irradiation by Ag 3 PO 4 . The Raman spectra of crystal violet and 4-aminothiophenol intensities decrease with longer irradiation durations, indicating the decomposition of organic compounds. The fiber probes also present repeatable using within several cycles. The research provides a potential method for photocatalyst decomposition monitoring.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Shenglong Chen,Qiang Zhou,Xiaojing Liu,Hongyan Guan,Peng Dong,Hongman Hou,Gongliang Zhang,Jingran Bi,Shuang Yan,Hongshun Hao
In this study, a novel Z-scheme ZnO-AgCl-Ag photocatalyst was prepared by converting the metal-organic framework ZIF-8 to ZnO via a simple pyrolysis method and using a physical wet mixing method. The crystal structure, microstructure, elemental distribution, and photoelectrochemical properties of the catalyst were systematically characterized using various analytical techniques. The characterization results showed that the introduction of AgCl/Ag into ZnO exhibited a higher light absorption capacity as well as a lower transmission resistance. Photocatalytic degradation experiments showed that the ZA-3 sample achieved a 99.97 % degradation rate of 10 mg/L RhB in 24 min, which was 2.3 higher than that of ZIF-8-derived ZnO. In addition, we systematically investigated the effects of initial RhB concentration, solution pH, anion interference, and catalyst recycling cycle on the photocatalytic activity, demonstrating the stability and applicability of the composites under different conditions. In addition, radical trapping experiments were conducted to probe the photocatalytic reaction mechanism, and a Z-scheme charge transfer pathway was confirmed, in which photogenerated electrons were effectively separated and transferred at the Z-scheme heterojunction interface through the conductive channel of Ag nanoparticles as carriers, which significantly improved the photocatalytic activity. In this study, the advantages of MOFS were rationally and effectively utilized to design and prepare Z-scheme photocatalysts with UV–visible response.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
·
IF 4.6
Wei Zhang,Kuang Luo,Wenjie Chen,Min Chen,Ning Cai,Jumei Li
In surface-enhanced Raman scattering (SERS) measurements, the creation of “hot spots” and the effective concentration of analytes in these areas are crucial for enhancing detection sensitivity. In this work, a novel composite with highly SERS activity, Ag nanospheres decorated Ag nanostar/ZIF-8 composite (Ag NS/ZIF-8/Ag) was achieved via first coating the Ag nanostars with the metal-organic framework ZIF-8, known for its strong molecular adsorption capabilities, followed by the electrostatic self-assembly of Ag nanospheres. The composites produce numerous hotspots due to the abundant plasmonic nanogaps, including the interstitial space between the Ag nanostar and Ag nanospheres, as well as internanogaps between neighboring Ag nanospheres, resulting in outstanding SERS performance. It was successfully applied for the quantitative and simultaneous detection of diquat and thiram in fruit juice, achieving detection limits of 5.0 × 10 −8 mol/L and 1 × 10 −8 mol/L, respectively, with recovery rates ranging from 86.6 % to 118.4 %. Notably, under UV light exposure, the composite was able to degrade pesticides efficiently within 80 min. Additionally, its reusability was demonstrated by sustaining strong SERS activity over five continuous detection cycles. These results emphasize the capability of Ag NS/ZIF-8/Ag composites for sensitive pesticide detection via SERS.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Tingting Hu,Haimei Zeng,Hao Peng,Guanchao Yin,Jihong Zhang,Jun Xie,Yang Jiang
With the increasing discharge of pollutants into air, water, and soil, the rapid and sensitive detection and treatment of chemical pollutants, including toxic organic dyes and heavy metal ions, have become critical for minimizing potential threats to the ecological cycle and human health. In the current research, an in-situ degradation approach for toxic substances is proposed, combined with surface-enhanced Raman scattering (SERS). Fiber probes based on a silver nanoparticles/ silver phosphate tetrapod (Ag/ Ag 3 PO 4 ) composite were fabricated using a sequence of ion exchange, chemical reduction, and subsequent coating processes. The fiber probes were deployed for ultra-sensitive SERS detection and in situ photocatalytic degradation of dyes (specifically crystal violet (CV)) and heavy metal ions (particularly Hg 2+ ). The probes were functionalized with 4-mercaptopyridine (4-MPY) to facilitate the detection of Hg 2+ . Notably, the probes demonstrated detection limits as low as 10 −14 M for crystal violet (CV) and 4-aminothiophenol (PATP), and 10 −12 M of Hg 2+ . Under light exposure, the substrate degraded 93.2 % of CV and 98.0 % of PATP within 60 min, and 82.3 % of Hg 2+ within 30 min, as monitored in situs. Finite element method analysis suggested that the high electromagnetic field intensity generated by Ag/ Ag 3 PO 4 resulted from the close packing of Ag nanoparticles. Furthermore, the SERS fiber probes exhibited outstanding stability, selectivity, and reusability. This research suggest that the recyclable Ag/ Ag 3 PO 4 fiber probes hold significant potential for the detection and in situ monitoring of the degradation of trace environmental contaminants.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Xiaojun Wen,Yiting Liu,Weilong Zhang,Lijun You,Ning Cai,Jumei Li
In this research, we fabricated an innovative NiO/CN/Ag composite through the straightforward electrostatic assembly of Ag nanoparticles and g-C 3 N 4 sheets onto NiO nanoflowers. This composite enables both surface enhanced Raman spectroscopy (SERS) detection and photo-degradation of pesticides. The results reveal NiO/CN/Ag can quantitatively detect thiram (TRM) and diquat dibromide (DQDB) in water, with a limit of detection (LOD) of 10 −9 M, and also exhibit outstanding photo-degradation efficiency, exceeding 95 % for TRM and DQDB within 90 min under simulated sunlight. Significantly, after the organic reagent (citric acid) on NiO/CN/Ag was completely removed through simulated solar irradiation, the signal-to-noise ratios of SERS spectra on NiO/CN/Ag were enhanced, achieving LODs of 10 −8 M for TRM and DQDB in different fruit juices and dried flower teas. Additionally, the composite demonstrate impressive recyclability, maintaining robust SERS signals and high degradation rates even after five cycles of “detection-degradation” processes.
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