SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2026
·
IF 4.6
Yuxuan He,Jiayi Wei,Ming Cai,Junpeng Xia,Boheng Song,Jinxin Cheng,Xuanyu Sha
The performance of surface-enhanced Raman scattering (SERS) hinges on plasmonic hot spots that are both abundant and spatially uniform. Here, we propose a ligand-regulated, interface-confined growth strategy: on a bowl-like mesoporous polydopamine (PDA) scaffold, the ammoniacal silver precursor [Ag(NH 3 ) 2 ] + first forms a surface coordination layer with catechol and amine sites on PDA, lowering the activity of free Ag + and enriching Ag(I) at the interface, thereby shifting nucleation from homogeneous in the bulk to interface-confined. The ensuing constrained growth suppresses coalescence/bridging and excessive coarsening, yielding Ag nanoparticle arrays with controlled size, tunable interparticle gaps, and high spatial uniformity, and producing dense yet discrete coverage across both the inner and outer interfaces of the bowl. The concave curvature and dual-interface connectivity provide continuous coupling pathways and abundant adsorption sites, establishing a three-dimensional continuous hot-spot network. Correlative multi-technique characterization and spectroscopic analyses (SEM, EDS mapping, UV–Vis, XPS) elucidate the structure-optical-performance relationship, revealing a sparse-to-dense optimal regime and a coalescence-induced degradation regime, and identifying a precursor concentration of 50 mM as the optimal window. The resulting substrate exhibits good reproducibility for R6G (RSD ≈ 10.99 %) and affords clear molecular fingerprinting and linear quantification for pesticide analysis, with limits of detection of 55 ng mL −1 for methyl parathion and 0.209 ng mL −1 for thiram. This template-free, mild, and generalizable strategy provides a scalable route to three-dimensional plasmonic SERS substrates, leveraging PDA surface chemistry to prevent Ag aggregation at the source while constructing continuous hot spots networks.
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高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Xinyu Lan,Tingting Liu,Jianjun Li,Jian Zhu,Junwu Zhao,Guojun Weng
Silver coated gold nanobipyramids (Au NBPs@Ag) have opened up a wide range of applications in sensing based on the etching, due to the fact that a tiny change in shape or composition could directly lead to optical changes. Here, we developed an ultrasensitive surface-enhanced Raman scattering (SERS) method for S 2− sensing by using Au NBPs@Ag as nanoprobes. This strategy was revealed to be related to the redox reaction between S 2− and the silver nanoshell of the Au NBPs@Ag. The silver nanoshell was gradually etched as the S 2− concentration was gradually increased. Meanwhile, the generated Ag 2 S was secondary deposited on the surface of etched Au NBPs@Ag. Thus, the etching of silver shell and secondary deposition of Ag 2 S induced SERS decrease of the nanoprobes, which was not only highly selective toward S 2− but also showed a linear logarithmic dependence on S 2− concentrations from 10 −5 to 10 −8 M, with a limit of detection (LOD) of 4.7 × 10 −8 mol/L. Spike recovery tests in tap water demonstrated recoveries of 104.00%, 98.86%, and 105.32% with relative standard deviations (RSD) between 2.52% and 3.98%, validating high accuracy for S 2− detection. This approach provided a novel SERS strategy for trace sulfide monitoring in drinking water systems.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zhaohui Wang,Chunyu Duan,Yunqi Zhou,Fangping Wen,Qiuhong Lu,Dong Liu,Fei Wang,Xiuxia Meng
MXenes, a distinct class of two-dimensional metal carbides, are pursued to be promising potential for driving applications of lithium-ion storage with remarkable flexibility and conductivity. However, the electrochemical behavior of MXene-based anodes is far from reaching a satisfactory level due to severe interlayer stacking in MXenes, which immensely deteriorates the intrinsic conductivity in bulk and hampers the kinetic transport of Li + resulting in significant capacity fading as well as inferior rate capability. Hence, we proposed an effective tactic to significantly boost the electrochemical ability by constructing a hollow MXene/Ag composite comprised of 3D honeycomb-like MXene with Ag nanoparticles . Melamine formaldehyde (MF), the sacrificial template followed by thermal decomposition, can effectively transform 2D MXene nanosheets into a 3D hollow structure. Accordingly, rational 3D honeycomb-like MXene/Ag composite exhibits impressive rate performance and enhanced cycling stability of 310 mAh/g after 2000 cycles at 3 A/g with availably suppressing anode swelling, compared to pristine 2D MXene nanosheets, evincing the potentiality as a desirable anode for excellent electrochemical behavior lithium-ion batteries (LIBs).
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Gao-feng Wu,Jian Zhu,Guo-jun Weng,Hao-yu Cai,Jian-jun Li,Jun-wu Zhao
In this work, Au@Ag core-shell nanoparticles with different size Au TNPs as the core were synthesized through seed-mediated growth method. Various types of Au TNP@Ag core-shell nanoparticles were easily prepared by varying the amounts of AgNO 3 using the CTAC as surfactant . We have further investigated their plasmonic properties of various types of Au TNP@Ag core-shell nanoparticles. Au TNP@Ag core-shell nanoparticles have tunable localized surface plasmon resonance properties which can be controlled by volumes of AgNO 3 . The absorption peak of Au TNP@Ag core-shell nanoparticles increased from one to five and the intensity gradually increased with the increase of the volume of AgNO 3 . Moreover, by changing the core size from 62 nm to 110 nm, the characteristic absorption of Au TNP@Ag core-shell nanoparticles could be shifted from visible to infrared range. Then we analyze the influence of halide ions on the shape formation of Au TNP@Ag core-shell nanoparticles. Au TNP@Ag triangular nanoprism, Au TNP@Ag nanocube and Au TNP@Ag right bipyramid only can be obtained in the in the presence of Cl - while not other halide ions (Br - , I - ). The adsorption of Cl - and oxidative etching of Cl - /O 2 lead to the formation of single crystal Au TNP@Ag nanocube and Au TNP@Ag right bipyramid with well-defined shaped Au TNP. The present work expanded the field of gold and silver core-shell nanoparticles. More importantly, a large number of new nanomaterials have been obtained and shows promising applications in optics and sensing.
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Chemosensors
·
2022
·Vol. 10
·期 10
·423
·
IF 4.229
Chao Liu,Shenhao Wang,Xuan Dong,Qing Huang
Due to the increasing importance of food quality/safety control, there is an imminent need to develop efficient methods for the rapid detection of pesticide residues in agricultural products. Herein, we proposed a simple and rapid detection approach to the in situ detection of residual pesticides on fruit/vegetable using surface-enhanced Raman spectroscopy (SERS). Flexible and transparent SERS substrates were fabricated by transferring Au@Ag core-shell nanorods (Au@Ag NRs) arrays to silicone membranes, with the single-layer Au@Ag NRs arrays prepared by the liquid–liquid interface self-assembly method. The as-prepared SERS sensor showed excellent SERS activity and repeatability, and it could be readily pasted onto the surface of fruit and vegetables for residual pesticide detection. For the inspection of thiram in contaminated strawberries, apples, and mushrooms, the limit of detection (LOD) could reach 2 ng/cm2with high measurement recovery and reproducibility. In general, this work provides an effective way for the preparation and application of flexible and transparent SERS substrates in food-safety control.Keywords:surface-enhanced Raman spectroscopy (SERS);Au@Ag nanorods;flexible substrates;rapid detection;pesticide detection
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ANALYST
·
2022
·Vol. 147
·期 24
·5670-5679
·
IF 5.227
Ziyan Song,Siyu Chen,Qiushi He,Hu Liang,Guangyao Huang,Pan Li,Zongyao Hao,Liangbao Yang
The rapid and sensitive detection of ultra-trace marker molecules from biological samples is of great significance for the wide application of surface-enhanced Raman spectroscopy (SERS) methods in clinical diagnosis and disease monitoring. However, the cumbersome biological sample processing procedures and the poor enrichment of target analytes in hot spots hinder the practical applications of SERS methods. In this paper, we synthesized a novel floating SERS substrate by a simple one-step oxidation process, annealing and in situ chemical etching to form Ag-NPs@Cu-NW bundles on copper mesh (CM). In particular, under spontaneous bottom-up capillary action, the pressure difference at different nanogaps drives uric acid molecules to actively enter hot spots, so that the Ag-NPs@Cu-NW bundle nanostructure with the advantages of a light weight CM is capable of preventing the common coffee-ring effect and enhancing the spatial enrichment of analytes. Therefore, this SERS substrate realizes highly sensitive detection of uric acid at a level of 50 nM in pretreatment-free urine. Currently, this portable, flexible, simple, fast and cost-effective SERS substrate has great potential for early screening and clinical diagnosis of diseases in different biofluids.
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ACS ES&T Water
·
2022
·
IF 0
Xiaofeng Fang,Ruo Li,Ziyi Zhang,Xingran Zhang,Fang Li,Yanbiao Liu
Excellent perm-selectivity and fouling resistance are highly desirable for membrane separation in water treatment. Electrically conductive membranes have been recognized as an effective means for overcoming the permeability–selectivity trade off and enhancing the antifouling capability. However, the facile and controllable fabrication of conductive membranes with good flexibility, high conductivity, and stable separation performance remains a challenge. Herein, a novel conductive poly(vinylidene fluoride) (PVDF) ultrafiltration (UF) membrane with a thin silver nanoparticle (Ag NP) coating layer was developed via nonsolvent phase separation and green in situ reduction methods. Especially, the tannic acid/Fe3+ (TA/Fe) complex and carbon nanotube (CNT) were first blended into a PVDF UF membrane. The thin Ag NP coating layer was then in situ formed and firmly fixed on the membrane with TA to produce a conductive PVDF/TA-Ag composite membrane. The introduced Ag NP coating layer not only narrowed the pore size but also increased the electrical conductivity of the PVDF/TA membrane, which resulted in an enhanced electrostatic repulsion and remarkable humic acid (HA) rejection. The optimal membrane (i.e., PVDF/TA-Ag12) achieved an improved HA solution flux of 265 LMH/bar and an HA rejection of 97% under −2 V applied voltage, which are 2 times and 1.7 times higher than those of the uncharged membrane, respectively. Moreover, the PVDF/TA-Ag12 membrane exhibited a superior antifouling performance under an external electrical field. Meanwhile, the electrochemical reduction of Ag+ to Ag0 on the membrane matrix can effectually avoid the Ag NP leaching, keeping the stability of the separation performance. These findings provide an alternative and cost-effective method for the development of polymer conductive membranes to enhance pollutant rejection and mitigate membrane fouling.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Boqiang Gao,Yu Pan,Qianqian Chang,Zhonghua Xi,Hu Yang
In this work, the sheet-like BiVO 4 with a higher exposure ratio of {0 1 0} facets was synthesized by the addition of TiCl 3 , and the ratio of (0 4 0)/(0 1 1) on {0 1 0}BiVO 4 was 2.85 times higher than that of normal decahedral BiVO 4 . Accordingly, the {0 1 0}BiVO 4 /Ag/CdS all-solid-state Z-scheme heterojunction was further constructed by photoreduction of Ag and chemical deposition of CdS on the well prepared {0 1 0}BiVO 4 successively. The performance and mechanism of {0 1 0}BiVO 4 /Ag/CdS in synergistic adsorption-photodegradation of fluoroquinolones (FQs) from water were investigated in detail. The adsorption-photodegradation could be divided into three processes: adsorption, surface degradation, and solution degradation, with the rate constants of 0.118, 0.029, and 0.012 min −1 , respectively. Accordingly, the adsorption was a rapid process due to the combined CdS in this composited photocatalyst had a high affinity to FQs to achieve an adsorption equilibrium on the surfaces<30.0 min. Besides, {0 1 0}BiVO 4 /Ag/CdS had a better separation efficiency of photogenerated electron-hole pairs than BiVO 4 /Ag/CdS, because the enriched {0 1 0} facets of {0 1 0}BiVO 4 caused more BiVO 4 /Ag/CdS ternary structure formed, and>90% photodegradation efficiency for five FQs ( C 0 = 0.062 mmol/L) was thus obtained within 60.0 min. The radical trapping and EPR results showed that holes and superoxide radicals were the main active species for FQs photodegradation. In summary, {0 1 0}BiVO4/Ag/CdS achieved an enhanced performance in synergistic adsorption and photodegradation of organic contaminants from water, and a talented photocatalyst was thus provided in water and wastewater treatment.
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高影响因子
PACKAGING TECHNOLOGY AND SCIENCE
·
2022
·Vol. 35
·期 7
·557-567
·
IF 2.545
Rongkun Liu,Meijie Qu,Xuewen Qiu,Hai Wang,Mingshuai Fan,Ali Zhang,Qiushan Chen,Yuezhen Bin
Aiming at development of novel medical packings, poly (ethylene terephthalate) (PET)-based membranes with hydrophobic and antibacterial properties were prepared by electrostatic spinning of a blend of thermoplastic polyurethane (TPU), nano SiO 2 and Ag particles on PET nonwoven. In cooperation with electro-spun TPU/SiO 2 layer, the water contact angle (WCA) of PET nonwoven fabric was improved from 60° to 115–130°, and the water vapour transmission rate was 2200–2500 g/m 2 /24 h. It indicates that the modified PET nonwoven membrane exhibits a much better water resistance, highly increased hydrophobicity and moderate water permeability. Nano-silver provided excellent antibacterial properties for this non-cytotoxic PET/TPU/SiO 2 /Ag composite membranes. The PET/TPU/SiO 2 /Ag composite membranes had high mechanical properties, which exhibited a tensile strength of 56 MPa in the longitudinal direction and 35 MPa in the transversal direction, and tear strength of 30 kN/m in the longitudinal direction and 48 kN/m in the transversal direction. This new PET/TPU/SiO 2 /Ag composite membranes showed broad application prospects in the medical packaging industry.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yuenan Pan,Qi Chu,Shuang Guo,Sila Jin,Eungyeong Park,Yeonju Park,Yantao Sun,Lei Chen,Young Mee Jung
The purpose of this paper is to study the charge transfer (CT) process of a Ag/MBA/PAN system with different thicknesses of PAN and explore its SERS enhancement mechanism. It is found that as the PAN thickness is increased, the frequency and intensity of the characteristic MBA band gradually increases. The intensity of the b 2 mode increases significantly, which is attributed to the CT mechanism. As the PAN thickness is increased, the degree of CT (ρ CT ) gradually increases, which is due to the excited SPR from Ag. The electromagnetic enhancement mechanism, which occurs at the interface between PAN and Ag, generates hot electrons and rearranges the interface between PAN and Ag, thereby promoting electron transfer for the whole CT in Ag/MBA/PAN. These results show that CT occurs from the Fermi level of Ag to the LUMO level of MBA and then to the LUMO level of PAN. Additionally, the direction of CT is verified by 2D-COS. Therefore, this study not only reveals the ultrahigh SERS activity of the substrate but also explains the detailed process of regulating the substrate through the PAN thickness, which affects the SERS mechanism. This conductive polymer will open up a new horizon of SERS research and applications.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 5
·1-9
·
IF 6.408
Zhu Anni,Wang Tiansheng,Jiang Yuning,Hu Sen,Tang Wanxin,Liu Xinling,Guo Xiaoyu,Ying Ye,Wu Yiping,Wen Ying,Yang Haifeng
A specific surface-enhanced Raman scattering (SERS) assay for dopamine (DA) based on an azo derivatization reaction is proposed for the first time by preparation of p-aminothiophenol (PATP)-modified composite SERS substrate, composed of metal–organic framework (MIL-101) decorated with Au and Ag nanoparticles. As the result, the SERS method for detection of the azo reaction between PATP and DA exhibits superior sensitivity, selectivity, and stability. A reasonable linearity in the range 10 −6 to 10 −10 mol∙L −1 is achieved, and the limit of detection is 1.2 × 10 −12 mol∙L −1 . The reactive SERS assay is free from interference in complex physiological fluid. The feasibility of the proposed SERS method for the detection of DA levels in fetal bovine serum (FBS) samples and human serum samples is validated by HPLC–MS methods, displaying promising application potential in early disease diagnosis. Graphical abstract
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MATERIALS CHARACTERIZATION
·
2022
·
IF 4.537
Shuang Liu,Limin Ma,Cheng Zhen,Yishu Wang,Dan Li,Fu Guo
In advanced microelectronic packaging technology, the interfacial brittleness of Cu/Sn solder joints puts forward higher requirements for high-performance diffusion barriers. Cobalt–Phosphorus (Co-P) alloy coating becomes ideal candidates for its good wettability and diffusion resistance. In this work, for Co-P with different crystallinity , the barrier properties of electrodeposited Co-P coatings as well as the mechanical properties of Co-Sn intermetallic compounds (IMCs) at the Co-P/Sn-Ag interface were investigated. According to the XRD results, the crystallinity of the Co-P coating was directly related to the phosphorus (P) content, and Co-P were classified into three types: crystalline state, mixed state and amorphous state. The morphology, composition, phase characterization, and mechanical properties of the Co-Sn IMCs at the interface were investigated by SEM , EPMA , TEM , and nanoindentation methods, respectively. After 180 °C aging test for 120 h, the thickness of CoSn 3 generated at the interface of crystalline Co-4.2 at.% P/Sn-Ag was the smallest among a total of 18 Co-P coatings, where P content ranged from 0.9 at.% to 20.8 at.%, showing the best barrier properties. The hardness of (Co,Cu)Sn 3 at the amorphous Co-P/Sn-Ag interface was the lowest (3.2 GPa), which was only 47% of that of Ni 3 Sn 4 , exhibiting the lowest brittleness tendency. The mixed crystalline-amorphous Co-P could greatly improve the diffusion barrier properties while sacrificing a small degree of brittleness comparing to the amorphous coatings, and had the potential to become a general-purpose alloy coating. This work could provide a scientific basis for the selection of Co-P barrier layers with excellent barrier properties and mechanical properties leading to different application scenario in electronic packaging.
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