APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Gaojian Lv,Lifang Sun,Hui Gao,Chengcheng Ma,Wen Li,Shougang Chen
The construction of heterojunction has been considered as an effective strategy to achieve charge separation and improve photocatalytic activity. In this work, stable reduced Cu 2 O/Ag/Bi 2 MoO 6 (Cu 2 O/Ag/BMO) nanocomposites with high-efficiency antibacterial activities were synthesized via a simple wet chemical method. After illumination of 30 days, Cu 2 O/Ag/BMO still showed excellent antimicrobial capability against P. aeruginosa and S. aureus . The photoluminescence spectroscopy was used to analyze the electrons and holes recombination efficiency of samples, which suggested Cu 2 O/Ag/BMO could promote electron-hole separation and extend the lifetime of photogenerated carriers. The results of photocurrent responses test suggested that the photocurrent density of Cu 2 O/Ag/BMO was four times stronger than the Cu 2 O, which indicated the higher separation efficiency of electrons and holes pairs for the formed Cu 2 O/Ag/BMO. Besides, density functional theory proved that Ag nanoparticles could promote the electrons transfer from the Bi 2 MoO 6 layer to the Cu 2 O layer which facilitated the separation of photogenerated electron-hole pairs. Therefore, electrons and holes could better participate in the redox reactions and then generate more active substances (•OH and •O 2 – ), improving the antimicrobial ability. Therefore, the prepared Cu 2 O/Ag/BMO composites has a great application prospect in the antifouling field.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Xuechen Li,Chaojie Shi,Zixuan Feng,Jie He,Rui Zhang,Zhengchun Yang,Peng Pan,Huayi Li,Deqiang Feng,Lingcheng Zheng
The Si nanowires/ZnFe 2 O 4 /Ag composite photocatalyst is prepared by metal-assisted chemical etching and hydrothermal methods . Photoelectric conversion and photodegradation experiments show that the composite structure offers high photocatalytic performance under visible light. The photocurrent density of Si nanowires/ZnFe 2 O 4 /Ag is 1.76 mA/cm 2 , and the Methyl orange photodegradation rate is 19 % within 90 min. Furthermore, the photocatalytic activity of composite photocatalysts was studied under the magnetic field, which further improves the photocatalytic efficiency significantly. Energy band structure studies revealed that the interfacial contact in the Si nanowires/ZnFe 2 O 4 /Ag increases carrier transfer and charge separation, thereby improving photocatalytic performance. It can be seen from the I-V results that the Si nanowires/ZnFe 2 O 4 /Ag has a negative magnetoresistance . Therefore, in the presence of a magnetic field, photogenerated carriers can be more effectively transferred to the electrode surface to participate in the photocatalytic reaction with improved photocatalytic performance.
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Scientific Reports
·
2023
·Vol. 13
·期 1
·1-12
·
IF 4.6
Song Jie,Wan Yating,Yang Chen,Deng Qiuju,Cui Yingde,Yan Zhihong,Liu Yi
In this paper, a novel composite is constructed as a non-enzymatic hydrogen peroxide (H 2 O 2 ) sensor by liquid-phase exfoliation method, which is composed of copper oxide, cuprous oxide and silver nanoparticles doped few-layer-graphene (Cu x O/Ag@FLG). Its surface morphology and composition were characterized by scanning electron microscopy (SEM) and X-ray photo spectroscopy (XPS), and its H 2 O 2 sensing performances include catalytic reduction and quantitative detection were studied with electrochemical methods. Our sensor had a high sensitivity of 174.5 μA mM −1 cm −2 (R 2 = 0.9978) in an extremely wide range of concentrations from 10 μM to 100 mM, a fast response (about 5 s) and a low limit of detection (S/N = 3) of 2.13 μM. The sensor exhibits outstanding selectivity in the presence of various biological interference, such as dopamine, ascorbic acid, uric acid, citric acid, etc. In addition, the constructed sensor continued 95% current responsiveness after 1 month of storage further points to its long-term stability. Last but not least, it has a good recovery rate (90.12–102.00%) in milk sold on the open market, indicating that it has broad application possibilities in the food industry and biological medicine.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 3
·505-513
·
IF 1.6
Wang Wenbo,Xiong Wenhao,Long Yuting,Li Hong
We demonstrated a chemical process in the fabrication of a SERS fiber probe with an ultrahigh sensitivity. The synthesis was carried out by preparing Au@Ag core-shell nanorods (Au@Ag-NRs) self-assembled on polyelectrolyte (PE) multilayers, for which Au@Ag-NRs were controlled by adjusting the silver layer thickness. The effect of silver layer thickness of Au@Ag-NRs on the SERS performance of the fiber probe was investigated. The SERS fiber probe shows the best performance when the silver layer thickness is controlled at 8.57 nm. Under the condition of optimizing silver layer thickness, the fiber probe exhibits ultra-high sensitivity ( i e , 10 −10 M crystalline violet, CV), good reproducibility ( i e , RSD of 3.5%) and stability. Besides, electromagnetic field distribution of the SERS fiber probe was also investigated. The strongest enhancement is found within the core of fiber, whereas a weakened electromagnetic field exists in the fiber cladding layer. The SERS fiber probe can be a good candidate in ultra-trace detection for biomedical and environmental areas.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Xiaojian Li,Lijun Li,Yangzhi Wang,Xuehui Hao,Changzheng Wang,Zhenshan Yang,Hefu Li
The large-area fabrication of flexible and transparent surface-enhanced Raman scattering (SERS) substrates with high performance by a facile and efficient method is still challenging. Here, we demonstrated a large-scale, flexible and transparent SERS substrate composed of PDMS nanoripple array film decorated with silver nanoparticles (Ag NPs@PDMS-NR array film) prepared by a combination of plasma treatment and magnetron sputtering. The performances of SERS substrates were characterized by rhodamine 6G (R6G) using a handheld Raman spectrometer. The optimal Ag NPs@PDMS-NR array film exhibited high SERS sensitivity, with a detection limitation of R6G reaching 8.20 × 10 −8 M as well as excellent uniformity (RSD = 6.8%) and batch-to-batch reproducibility (RSD = 2.3%). In addition, the substrate showed outstanding mechanical stability and good SERS enhancement by backside illumination, thus it was suitable for in situ SERS detection on curved surfaces. The detection limit of malachite green on apple and tomato peels was 1.19 × 10 −7 and 1.16 × 10 −7 M, respectively, and quantitative analysis of pesticide residues could be realized. These results demonstrate that the Ag NPs@PDMS-NR array film has great practical potential in rapid in situ detection of pollutants.
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CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Wenli Wei,Wenhe Wang,Fengxia Wu,Yu Tian,Guobao Xu,Wenxin Niu
Plasmonic-coupled circular dichroism (PCCD) represents a versatile method to synthesize chiroplasmonic nanoparticles (NPs), which play irreplaceable roles in various fields such as enantioselective sensing, spectroscopies, and chiral catalysis. Nonetheless, two critical challenges are faced in the development of PCCD-based chiroplasmonic NPs: low chiral amplification and poor stability. To circumvent these restrictions, we herein performed a quantitative study of the enhancement and stability of PCCD by the embedment of chiral molecules in discrete Ag NPs. Our study reveals that the high chiral amplification is attributed to the chiral molecules embedded in NPs, rather than those adsorbed on the surface. The embedment of chiral molecules significantly increases the coupling between chiral molecules and Ag NPs, and thus, a record-high chiral amplification of over 4800 times is achieved. Moreover, the CD signals of the Cys-embedded Ag NPs are almost unchanged after 3 months of storage, also benefiting from the embedment strategy. These results will open up new possibilities for designing new PCCD systems with high chiral amplification and superior stability and lay the groundwork for the applications of PCCD-based chiral NPs.
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ACS Omega
·
2023
·
IF 4.1
Housen Jiang,Qin Xu,Xiaolin Wang,Lin Shi,Xuedong Yang,Jianmin Sun,Xifan Mei
Diabetic foot ulcers with complex healing wounds accompanied by bacterial infection are considered a significant clinical problem which are made worse by the lack of effective treatments. Traditional antibiotics and dressings have failed to address wound infection and healing, and multifunctional combination therapies are attractive for treating chronic wounds. In this study, arginine (Arg) was loaded onto the surface of silver nanoclusters and encapsulated in a hydrogel to achieve antibacterial, anti-inflammatory, angiogenic, and collagen deposition functions through the slow release of Arg combined with silver nanoclusters. In vitro studies indicated that Arg-Ag@H composites inhibited methicillin-resistant Staphylococcus aureus and Escherichia coli by 94 and 97%, respectively. The inhibition of bacterial biofilms reached 85%, and the migration ability of human venous endothelial cells (HUVECs) increased by 50%. In vitro studies showed that Arg-Ag@H composites increased the healing area of wounds by 26% and resulted in a 98% skin wound-healing rate. Safety studies confirmed the excellent biocompatibility of Arg-Ag@H. The results suggest that Arg-Ag@H offers new possibilities for treating chronic diabetic wounds.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yunling Dai,Kun Qi,Kangkang Ou,Yutang Song,Yuman Zhou,Meiling Zhou,Hongjing Song,Jianxin He,Hongbo Wang,Rongwu Wang
The emerging intelligent piezoresistive yarn/textile-based sensors are of paramount importance for skin-interface electronics, owing to their unparalleled features including softness, breathability, and easy integration with functional devices. However, employing a facile way to fabricate 1D sensing yarns with mechanical robustness, multi-functional integration, and comfortability is still demanded for satisfying the practical applications. Herein, a facile one-step synchronous conjugated electrospinning and electrospraying technique is innovatively employed to continuously construct an Ag NW-embedded polyurethane (PU) nanofiber sensing yarn (AENSY) with hierarchical architecture. This 1D AENSY with weavability and stretchability can be woven into AENSY textile-based sensors integrated with functions of strain and pressure sensing. In this embedded multi-scale architecture, Ag NWs are evenly embedded and locked in the oriented and twisted PU nanofiber (PUNF) scaffold, forming the hierarchical mechanical sensing layer on the surface of the AENSY with favorable stability. Meanwhile, the presence of the elastic PUNFs enhances porosity, elasticity, and considerable deformation space, which in turn endow the AENSY textile-based sensor with a gauge factor (GF) up to 1010, a pressure sensitivity up to 16.7 N–1, high stretchability up to 160%, and high stability under long-term cycles. In addition, the AENSY textile-based sensor exhibits light weight and the unique advantage of skin-friendliness with the human body, which can be directly and conformally attached to the curved human skin to monitor the various human movements. Furthermore, the weavable AENSYs can be integrated into smart textiles with sensing arrays, which are capable for spatial pressure and strain mapping. Thus, the continuous one-step developing process and the stable embedded-twisted fiber structure provide a promising strategy to develop innovative smart yarns and textiles for personalized healthcare and human–machine interfaces.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ruikai Wang,Haiyan Li,Zhichao Hao,Ting Feng,Yanxin Li,Bohua Dong,Lixin Cao
The recombination of photogenerated carriers and sluggish surface oxidation kinetics severely inhibited the development of copper tungstate (CuWO 4 ) photoanode photoelectrochemical (PEC) water oxidation. Herein, the Zn 1-x Mg x O-modified CuWO 4 photoanode ameliorated the vital matter of easy recombination of electron-hole pairs, where the transformation of the heterojunction type (type I to type II) between Zn 1-x Mg x O and CuWO 4 played a crucial role in the extraction of carriers. Further, the effective charge separation was obtained utilizing the local surface plasmon resonance (LSPR) of plasma metal (Ag), which facilitated the PEC water oxidation reaction. Besides, the surface states trapped/stored holes and reduced charge transfer resistance, thus facilitating charge transfer. The overlap of the fillable surface states with filled redox coupled states ensured the enhancement of the water oxidation kinetics, which further promoted the charge transfer. As a result, the optimized CuWO 4 /Zn 0.7 Mg 0.3 O/Ag photoanode showed significant advancement in photocurrent density (1.71 mA/cm 2 at 1.23 V vs. RHE), electrochemical impedance and stability. This work emphasized the interfacial structure modulation of two strategies that potentially provide more ideas and options for the design of other efficient photoanodes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yalan He,Dongling Wu,Qian Liu,Jun Tang,Rong Chang,Tao Wang
Ag nanosheets (AgNS) exhibit enormous potential because of their unique structure and properties. However, the commonly used methods to synthesize AgNS have some disadvantages, such as long reaction time or high reaction temperature, or they involve toxicity and irritating corrosion solvents, which greatly limit their development and application. In this study, AgNS with edge lengths of 500–600 nm, and thicknesses of 25–30 nm are rapidly synthesized by ethylene glycol/deionized water (EG/DI water, solvent), poly(vinylpyrrolidone) (PVP, capping agent), ascorbic acid ( L -AA, reducing agent) at 0 °C in only 30 min. This study provides a fast and facile approach for the stable and large-scale production of AgNS. Benefiting from the unique structure of the prepared AgNS, as the SERS substrate it can be used to detect dye molecules (R6G), and achieves a superb enhancement factor of 8.7 × 10 7 . What’s more, it is also successfully realized practical detection of antibiotic benzylpenicillin sodium (NaBP) in milk. The results indicate that the AgNS produced by a simple and efficient method may serve as a high-efficiency SERS substrate for speedy chemical contamination detection.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Xiyue Wang,Shang Gao,Junfu Wang,Xinying Fan,Chi Song,Chuanwei Zhou,Shuyun Shi,Dandan Wang,Hongji Li
In this work, a novel sensor for selective detection of 2,6-dichlorophenol (2,6-DCP) is developed by combining the selectivity of molecular imprinting technology (MIPs) with the sensitivity of SERS technology. In order to enhance SERS activity of the substrate, Ag nanoparticles are loaded on Ta 2 O 5 particles by means of photodeposition. The synthesized Ta 2 O 5 @Ag is combined with MIL-101 (Fe) to enrich more target molecules and reduce the limit of detection. Finally, Ta 2 O 5 /Ag/MIL-101(Fe)@MIPs (TAM@MIPs) is synthesized by precipitation polymerization for selective detection of 2,6-DCP. When the concentration of 2,6-DCP changes between the range of 10 −2 ∼ 10 −9 M, the Raman intensity and concentration present a good linear relationship. The correlation coefficient (R 2 ) is 0.9969 and the limit of detection (LOD) of 2,6-DCP is 10 −9 M. Furthermore, Under UV-irradiation, the TAM@MIPs also presents photocatalytic performance, which can effectively degrade the organic interfering molecule adsorbed on its surface and present high-efficiency reproducibility. This method broadens the application field of SERS detection and provides a new procedure for the phenolic pollutant detection.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 3
·1-10
·
IF 5.7
Fan Xiaoyu,Zhang Shuai,Li Rui,Chen Yafei,Jiang Shuhan,Liu Tao,Shao Xiaodong,Wang Shuhao,Yue Qiaoli
Novel and portable cotton swab–based fluorometry was constructed for the first time for 3-aminosalicylic acid (3-ASA) and 5-aminosalicylic acid (5-ASA) detection. It was carried out by fluorescence enhancement on silver (Ag)–doped black phosphorus quantum dots (Ag@BPQD). Ag@BPQD were prepared from AgNO 3 and bulk black phosphorus in N, N-dimethylformamide (DMF) solution by solvothermal decomposition after mechanical exfoliation. Ag@BPQD show blue fluorescence with a quantum yield (QY) of 2.43%. In the presence of Ag@BPQD, 3-ASA exhibited bright blue fluorescence (λ ex = 328 nm, λ em = 448 nm). The fluorescence of 5-ASA was also enhanced significantly and exhibited bright green emission (λ ex = 328 nm, λ em = 484 nm). The linear range of 3-ASA is 0–90 μM with a detection limit (LOD) of 0.10 μM, relative standard deviation (RSD) ≤ 2.04%, and a recovery range of 98.0–104.3%. The linear range of 5-ASA is 0–120 μM with a LOD of 0.12 μM, RSD ≤ 1.34%, and a recovery range of 98.0–101.3%. When 3-ASA and 5-ASA were mixed in different ratios, the fluorescence showed different colors. The possible mechanism of the interaction between 3-ASA (or 5-ASA) and Ag@BPQD may be ascribed to the generation of excited-state intramolecular proton transfer. To realize convenient detection of 3-ASA and 5-ASA, a Ag@BPQD portable sensing method using cotton swabs were built. The proposed approach provides the detection of 3-ASA and 5-ASA in environmental and biological samples with high efficiency, accuracy and portability. Graphical Abstract
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危险品化学品经营许可证（带存储）