MICROCHEMICAL JOURNAL
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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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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2025
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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
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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
Li Tian,Yujia Song,Ruidan Li,Yanjia Guo,Pengfei Han,Guangping Ma,Hanyue Jiang,Wenzhuo Wang,Tengying Ma
A molecularly imprinted electrochemiluminescence (ECL) sensor was developed for ultrasensitive tartrazine (TZ) detection. The system employed Ru(bpy) 3 2+ encapsulated in UiO-66 as the luminophore, with tri-n-propylamine (TPrA) as co-reactant. Carbon nitride nanosheets (CNNS) functionalized with Ag nanoparticles (Ag NPs) enhanced the ECL signal through resonance energy transfer, while the UiO-66@Ru(bpy) 3 2+ /CNNS@Ag NPs/TPrA combination provided synergistic signal amplification. Selective recognition was achieved through a molecularly imprinted polymer (MIP) layer fabricated by electropolymerizing pyrrole with TZ as template. Target binding induced ECL quenching via electron transfer inhibition, enabling quantification. The sensor showed excellent performance with a wide linear range (1.0 × 10 −12 -1.0 × 10 −6 mol L −1 ) and low detection limit (3.3 × 10 −13 mol L −1 , S/N = 3). Practical utility was demonstrated through successful TZ determination in food samples, highlighting its potential for synthetic dye monitoring in complex matrices. The integration of advanced nanomaterials with MIP technology resulted in a sensitive, selective, and practical sensing platform.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Diancheng Zhu,Yiting Liu,Yangtao Qian,Miao Cheng,Tao Wei,Qianqian Liu,Ruirui Wang,Wanfei Li,Zhenxiao Fu,Haiyang Jiang,Zibo Li,Bo Liu,Jing Hu
Gallium nitride (GaN)-based gas sensors are widely recognized for their excellent carrier mobility, high-temperature resistance, and corrosion resistance, making them suitable for extreme working conditions. However, pure-phase GaN suffers from poor sensitivity and slow response/recovery rates due to its surface chemical stability. In this work, we proposed an Ag-modified GaN thin film, fabricated via magnetron sputtering, for direct integration into a sensor device for room-temperature NO 2 detection. The Ag modification is achieved through a dual approach: thermal diffusion combined with sputtering, followed by wet etching. The optimized Ag-GaN sensor demonstrates a maximum response of ∼4.3 toward 10 ppm NO 2 at room temperature (25 ± 3 °C), with excellent linearity across two concentrations range (1–10 ppm and 400–1000 ppb). The device exhibits a theoretical detection limit of ∼1.35 ppb and a response/recovery time of 150/400 s. Furthermore, the sensor shows highly reversible reaction-recovery behavior, with 2.05 % relative standard deviation (RSD), indicating outstanding repeatability. These findings advance the application of GaN-based materials in gas sensing, particularly for sensitive and reliable NO 2 detection at room temperature.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
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IF 7.7
Yi Yuan,Junlin Chen,Limin Cao,Jianxin Sui,Xiudan Wang,Hong Lin,Kaiqiang Wang
Surface-enhanced Raman scattering (SERS) substrates hold great potential for rapid food monitoring, but the inability to reconcile high enhancement, uniformity, and stability presents a critical trilemma for substrate design and practical applications. Here, inspired by the hierarchical structure of lychee, we developed an innovative "integrated balanced enhancement-protection" strategy, fabricating a lychee-like Au@Ag/Au nanoarray chip via a simple, uniform oil/water/oil (O/W/O) self-assembly technique. This design mimics the architecture of lychee: the outer Au layer, modeled after lychee’s peel, provides chemical protection; the inner Au@Ag layer, mirroring lychee’s seed and flesh, delivers strong plasmonic enhancement. The unique bilayer nanoarchitecture, featuring dense and vertically coupled plasmonic hotspots, ensures highly efficient electromagnetic (EM) field by Au-Ag synergistic effects. It demonstrates an analytical enhancement factor (AEF) of 2.30 × 10 6 , uniformity with a relative standard deviation (RSD) of 6.55 %, and stability with 93.26 % signal retention over 60 days. When coupled with a universal pretreatment protocol to minimize matrix interference, the platform enables sensitive and reliable quantitative detection of three representative food additives, including potassium sorbate (PS), sodium benzoate (SB), and sodium saccharin (SS) in complex fruit matrices. The limit of detection (LOD) for all analytes was below 75 mg/kg, substantially surpassing the national regulatory standards of China. Importantly, the chip demonstrated high recoveries (86.62–102.49 %) and low RSD (< 9 %) across multiple fruit types. Beyond food safety, this scalable, low-cost approach not only overcomes SERS substrate bottlenecks but also provides a viable field-deployable tool with broader implications for SERS-based analysis.
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Catalysts
·
2025
·Vol. 15
·期 7
·638
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IF 4
Elmuez Dawi,Mohsen Padervand
Ag/AgCl-decorated layered lanthanum oxide (La2O3) and niobium pentoxide (Nb2O5) plasmonic photocatalysts are fabricated through an ionic liquid-mediated co-precipitation method. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) techniques were used to illustrate the physicochemical properties of the materials. The photoactivity was evaluated for the degradation of Acid Blue 92 (AB92) azo dye, a typical organic contaminant from the textile industry, and U251 cancer cell inactivation. According to the results, Nb2O5–Ag/AgCl was able to remove >99% of AB92 solution in 35 min with the rate constant of 0.12 min−1, 2.4 times higher than that of La2O3–Ag/AgCl. A pH of 3 and a catalyst dosage of 0.02 g were determined as the optimized factors to reach the highest degradation efficiency under solar energy at noon, which was opted to have the highest sunlight intensity over the reactor. Also, 0.02 mg/mL of Nb2O5–Ag/AgCl was determined to be of great potential to reduce cancer cell viability by more than 50%, revealed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and mitochondrial membrane potential (MMP) examinations. The mechanism of degradation was also discussed, considering the key role of Ag0nanoparticles in inducing a plasmonic effect and improving the charge separation. This work provides helpful insights to opt for an efficient rare metal oxide with good biocompatibility as support for the plasmonic photocatalysts with the goal of environmental purification under sunlight.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Gang Cheng,Xinyu Tong,Wuxia Zhang,Wei Chen,Jinyan Xiong
Using amine-modified protonated titanate (NH2–H2Ti2O5·3H2O) as a template, surface reconstruction is carried out by hydrothermal treatment in the NaOH/ethylene glycol (EG)/H2O system, and finally, Ag nanoparticle-loaded 1D@2D TiO2@Na2Ti3O7 nanoarchitectures (TiO2@Na2Ti3O7–Ag) have been fabricated. The corresponding formation process is analyzed by using XRD, SEM, and EDX techniques. XPS and Fourier transform infrared (FT-IR) spectra confirm the presence of surface amino groups. Photo/electrochemical measurements indicate that the loading of Ag0 is beneficial for light absorption, charge separation, and transfer of 1D@2D TiO2@Na2Ti3O7 nanoarchitectures. The best CH4 and CO yields in the photocatalytic CO2 reduction test on the TiO2@Na2Ti3O7–Ag0.025 photocatalyst are 9.01 and 0.88 μmol/g/h, which are improved nearly 64 and 44 times, respectively. The generation of the *HCOO–, *CO, and *OCH3 intermediates corresponding to the reaction pathway is studied by in situ FT-IR. These findings could pave ways for the development of efficient photocatalytic CO2 conversion systems.
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Analytical Methods
·
2025
·
IF 2.6
Junaid Younus,Qi Wang,Weifan Pan,Jimin Shao,Xiaowei Guo,Xue Yang
Surface-enhanced Raman scattering (SERS) is a rapid, sensitive, and non-destructive technique for pesticide detection. However, most reported studies focus on single-analyte detection, and the simultaneous detection of multiple pesticide residues in complex matrices such as tobacco leaves remains challenging. In this study, we developed a portable SERS platform for the simultaneous detection of pendimethalin, propamocarb, and carbendazim using a polystyrene@silver (PS@Ag) core–shell substrate. The method enabled rapid detection (<15 min) with limits of detection (LODs) of 0.1 mg kg−1 for carbendazim, 5 mg kg−1 for pendimethalin, and 10 mg kg−1 for propamocarb in individual analyte detection, which meets the European Union's maximum residue limits (MRLs). In ternary mixtures, the LODs were 1 mg kg−1 for carbendazim, 5 mg kg−1 for pendimethalin and 10 mg kg−1 for propamocarb with strong linearity (R2 = 0.97–0.98). The substrate exhibited uniform enhancement with relative standard deviations (RSDs) of 3.53% for pendimethalin, 7.76% for propamocarb, and 4.70% for carbendazim, and high sensitivity, achieving enhancement factors for all target pesticides (3.4 × 101 for pendimethalin, 3.7 × 101 for propamocarb, and 6.0 × 103 for carbendazim). To the best of our knowledge, this is the first report to demonstrate that a PS@Ag SERS substrate combined with a portable Raman spectrometer serves as a highly reliable and promising tool for on-site monitoring of multiple pesticide residues in food safety and environmental applications.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 12
·1-9
·
IF 6.232
Zhao Yunfei,Chen Jun,Zhong Hangtian,Zhang Chengli,Zhou Yuan,Mao Weiran,Yu Chao
The development of a novel signal amplification system is described for sensitive determination of α2,6-sialylated glycans (α2,6-sial-Gs), an important prognostic tumor biomarker. First, Fe-based metal-organic frameworks (Fe-MOFs) with silver nanoparticles (AgNPs) decorated onto the outer surface were designed and synthesized with controlled octahedron structures. The new Ag/Fe-MOFs nanocomposite possessed strong conductivity and a large surface area to carry more nanoprobes. To connect the Ag/Fe-MOFs nanocomposite with more groups, the nanocomposite was functionalized by -COOH with SH-PEG-COOH to bind with an α2,6-sial-Gs catcher, M-APBA, via -CONH- bonds. More importantly, the Ag/Fe-MOFs also exhibited an excellent endogenous redox mediator property to produce electrons, which is the fundamental mechanism underlying amplification of an electronic signal. A gold electrode was used to accelerate electron transfer and immobilize the α2,6-sial-Gs lectin (SNA). After the sandwich-type catcher recognition (SNA/α2,6-sial-Gs/M-APBA), the current peak response was provoked in the process of oxidizing AgNPs to Ag + in the forward anodic potential sweep, while Cl − in a PBS solution was transferred into Ag + to maintain charge neutrality. Optimized particles were employed for direct fabrication of the sandwich-type affinity biosensor, which was found to show a linear detection range from 1 fg mL −1 to 1 ng mL −1 with a detection limit of 0.09 fg mL −1 . Furthermore, the biosensor exhibited excellent specificity and stability, indicating that such a novel nanobiotechnology platform can be used to initiate potential utility for monitoring biomarkers in serum. Graphical abstract
(A)Schematic presentation of synthesis and surface modification of Ag/Fe-MOFs. The new Ag/Fe-MOFs nanocomposite possessed commendable conductivity and large surface area to carry more nanoprobe; after functionalizing the Ag/MOFs with SH-PEG-COOH, the functionalized endogenous redox mediator (c-Ag/MOFs) realized the possibility that can connect with the biological catcher. (B) Schematic diagram of electrode construction for detecting α2,6-sialylated glycans (α2,6-sial-Gs). By using the c-Ag/Fe-MOFs functional endogenous redox mediator, we successfully implemented the electrochemical detection of α2,6-sial-Gs.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Dong Liang,Junjun Luo,Yaliang Huang,Xiang Liang,Zaichun Zhou,Jianxiu Wang,Xiaoqing Qiu
In this study, we report the development of indirect Z-scheme heterojunction to construct a cathodic photoelectrochemical (PEC) sensor for highly-selective detection of endogenous H 2 S using AgCl-Ag core–shell nanostructures coupled with porous carbon nitride (PCN) as cathode materials. As an electron mediator, Ag on the Z-scheme heterojunction transformed to Ag 2 S in the presence of H 2 S, resulting in the destruction of original charge-carrier migration pathway. Meanwhile, photo-induced charges on the then formed AgCl-Ag 2 S/PCN cannot be as effectively separated as they are on AgCl-Ag/PCN due to the straddling energy band alignments. A decrease in cathodic signal may be expected. Consequently, the H 2 S concentration could be quantitated by such corresponding decrease, which thus underlines a novel signal-off cathodic PEC bioanalysis strategy. More importantly, the ‘Z-scheme’ PEC sensor based on AgCl-Ag/PCN exhibits analytical performance with high sensitivity, showing its potential to be applied to the areas of biomedical and health care etc.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Jun-Tao Cao,Xiao-Long Fu,Li-Zhen Zhao,Shu-Hui Ma,Yan-Ming Liu
Nowadays, electrochemiluminescent resonance energy transfer (ECL-RET) as a promising signaling mechanism has been proved its promising perspective for bioassay, whereas the limitation of energy transfer efficiency remains a big challenge. Herein, we highlight a high-efficient ECL-RET mode between luminescent materials and noble metal nanoparticles, in which luminescent materials (g-C 3 N 4 nanosheets as the energy donor) and noble metal nanoparticles (Ag nanoparticles as the energy acceptor) were innovatively combined into one nanostructure, greatly reducing the energy loss and effectively promoting the RET efficiency. To prove the concept of the RET mode in ECL bioanalysis, a split-type ECL immunosensor was developed using interleukin-6 (IL-6) as a model. In the presence of IL-6, a sandwich immunoreaction occurred in anti-IL-6 antibody-coated 96-well plate by using glucose oxidase and anti-IL-6 antibody-conjugating silicon dioxide nanoparticles (anti-IL-6-SiO 2 -GOx) as signal label. The carried GOx oxidized glucose to generate H 2 O 2 , which etched Ag nanoparticles in g-C 3 N 4 -Ag nanostructure, thereby destroying the ECL-RET between g-C 3 N 4 and Ag and thus recovering the ECL intensity. The high-efficient ECL-RET in one nanostructure and GOx-induced H 2 O 2 etching modulation in this proposed system endowed the high sensitivity of the immunoassay toward IL-6 with the detection limit of 3.2 × 10 −14 g/mL and the dynamic working range of 1.0 × 10 −13 –1.0 × 10 −8 g/mL. It’s believed that this ingenious combination of g-C 3 N 4 and Ag into one nanostructure provides a new perspective to expand the application of ECL-RET of luminescent materials and noble metal nanoparticles.
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