ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Hongying Li,Jiale Zhang,Lingling Jiang,Ruo Yuan,Xia Yang
The identification of enantiomers is of great importance in chiral separations and medicinal chemistry . While Surface-enhanced Raman spectroscopy (SERS) is a technique that provides vibrational fingerprints of analytes . The enantiomers identification relies on the SERS difference between left and right-handed circularly polarized light or additional selectors for indirect distinction. In this work, Au–Ag core shell nanobipyramid (L/ [email protected] BPs) were synthesized guiding by chiral encoder of L/D-cysteine. L/ [email protected] BPs produced plasmon-induced circular dichroism signals in the plasmon resonance absorption band , which can be tuned by modulation the amount of cysteine. Moreover, the chiral anisotropy factor of L/ [email protected] BPs at 532 nm can reach 5.11 × 10 −3 . Due to the selective resonance coupling between L/ [email protected] BPs and different enantiomers, L/ [email protected] BPs were further used as SERS substrates for efficient discrimination of biologically relevant small molecules . Chiral [email protected] BPs display the potential for chiral drug identification.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 13
·期 1
·499-505
·
IF 4.036
Rong Wang,Jiamin Luo
Rapid and accurate identification of bacteria is essential to ensure food safety and prevent pathogenic bacterial infection. In this study, a highly efficient method was established for accurately identifying bacterial species by applying Ag NP-filter paper based Surface enhanced Raman spectroscopy (SERS) analysis and Partial Least Squares-Discriminant Analysis (PLS-DA) statistical methods. The flexible Ag NP filter paper substrate with high sensitivity and uniformity was prepared by a facile and low-cost silver mirror reaction at room temperature, which exhibited desirable SERS activity in bacteria detection. Furthermore, PLS-DA was successfully employed to distinguish SERS spectra from S. aureus CMCC 26003, E. faecalis ATCC29212 and L. monocytogenes ATCC 19115 with a sensitivity of 93.3–100%, specificity of 96.7–97%, and overall predicting accuracy of 95.8%. This exploratory study demonstrates that a Ag NP-filter paper based SERS sensor coupled with PLS-DA has great potential for rapid and effective detection and identification of bacteria.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Qiaojuan Wang,Jianyue Wang,Wenjuan Rui,Dan Yang,Xiaoyue Wan,Chunmei Zhou,Renhong Li,Wen Liu,Yihu Dai,Yanhui Yang
Aqueous-phase reforming of biomass-derived formaldehyde is one of efficient and sustainable routes to generate molecular hydrogen as clean energy resource. In this work, Ag/MgCO 3 catalyst is prepared with constructed stable carbonate-modified metal-support interfaces. Under mild and neutral reaction conditions, it exhibits a near an order of magnitude higher low-temperature activity in formaldehyde reforming reaction for producing hydrogen in comparison with Ag/MgO. The catalytic and spectral observations reveal that the Ag/MgCO 3 -catalyzed reaction follows an O 2 -involved HCHO/H 2 O reforming reaction pathway through O 2 − , OOH and H radicals as highly active intermediates. Ag/MgCO 3 catalyst shows high rates in isotopic H 2 -D 2 exchange and HCHO/D 2 O reforming reactions and displays an apparent activation energy (E a ) as low as 7.5 kJ mol −1 within 10–50 °C, indicating facile activation of HCHO C H and H 2 O O H bonds. Furthermore, Ag/MgCO 3 catalyst adsorbs HCHO molecule in a favorable configuration and strength, as evidenced by the HCHO desorption profile. Comprehensive positive factors benefit to the superior hydrogen production activity of carbonate-modified Ag/MgCO 3 than Ag/MgO.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yuanjie Xu,Shichao Yang,Meihui Ying,Xing Lin,Haibo Pan
Metal-organic frameworks (MOFs) are with extensive attention for environmental remediation due to their various modification and high density of active sites. Herein, a series of Ag/ZnO@ZIF-C with core-shell structure and graphene carbon (C) acts as a sandwich bridge were designed as a photocatalyst , accelerating the interfacial charge transfer rate between Ag and ZnO. Photocatalytic activities of Ag/ZnO@ZIF-C is remarkably improved toward rhodamine B (RhB) under UV irradiation , i.e., the degradation rate by Ag/ZnO@ZIF-C (20 wt%) is 2.27 times than that of P25. RhB molecules were simultaneously photodegraded at multiple sites, including N-site de-ethyl, conjugate structure and benzene ring . The photocatalytic upgrading performance was recognized to the synergetic interface between ZnO@ZIF-C and Ag nanoparticles (NPs) with effective separation and suppressed the recombination of electrons and holes. It is suggesting that the electrons in the valence band (VB) of ZnO are excited to the conduction band (CB) and transferred to Ag NPs through the ZIF-C layer, then react with adsorbed oxygen to create superoxide radicals and degrade RhB into small molecules. After a five-consecutive operation, its photocatalytic efficiency by Ag/ZnO@ZIF-C (20 wt%) still maintains at 95.11 %. This work provides a promising method for the rational design of high-performance carbon doped photocatalysts for environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Science
·
2023
·Vol. 11
·期 4
·1335-1349
·
IF 6.6
Hanchi Wang,Dongyang Wang,Huimin Huangfu,Siyu Chen,Qiuyue Qin,Sicong Ren,Yidi Zhang,Li Fu,Yanmin Zhou
Periodontitis is an inflammatory disease caused by bacterial infection. Excessive immune response and high levels of reactive oxygen species (ROS) further lead to the irreversible destruction of surrounding tissues. Developing new antimicrobial materials that regulate the immune system to resist inflammation can effectively treat periodontal inflammation. A nanoplatform integrating Ag+, photothermal therapy (PTT), and procyanidins (PC) for precision antibacterial and synergistic immunotherapy for periodontitis was proposed. This work loaded PC into AuAg nanoparticles, and the resulting nanocomposite was named AuAg-PC. PTT can effectively remove pathogenic bacteria, but high temperatures can cause tissue damage. Ag+ contributes to the preparation of a nanoparticle branched structure that improves the photothermal efficiency and helps PTT achieve an excellent antibacterial effect and avoid periodontal tissue damage. PC regulates host immunity by eliminating intracellular ROS, inhibiting inflammatory factors, and regulating macrophage polarisation in periodontal disease sites. It enhances the host's resistance to bacterial inflammation. AuAg-PC exerted an excellent anti-inflammatory effect and promoted tissue repair in animal periodontal inflammation models. Hence, AuAg-PC significantly combats periodontal pathogens and shows great application potential in the photothermal-assisted immunotherapy of periodontitis. This design provided a new controllable and efficient treatment platform for controlling persistent inflammation infection and regulating immunity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jialu Yang,Bochong Wang,Hanxin Liao,Jianyong Xiang,Congpu Mu,Anmin Nie,Kun Zhai,Tianyu Xue,Fusheng Wen
Flexible electromagnetic interference (EMI) shielding materials are in urgent need in the flexible and wearable electronics fields. In this study, multifunctional flexible silver-coated carbon nanofibers/bacterial cellulose (Ag/CNFs/BC) films were fabricated by vacuum filtration equipment using bacterial cellulose as a flexible substrate. Silver-coated carbon nanofibers were prepared by the chemical deposition method, and the silver was uniformly coated on the surface of carbon nanofibers with scanning electron microscopy (SEM) observation. Compared with the carbon nanofibers/bacterial cellulose (CNFs/BC) films, the EMI performance of Ag/CNFs/BC films was greatly enhanced because of the improvement of conductivity up to 4184 S/m. The EMI shielding effectiveness was highly enhanced over 55 dB in the X-band (8–12 GHz) under a relatively low thickness of 34 μm for the Ag/CNFs60/BC film. Moreover, the Ag/CNFs60/BC film also showed great multifunctional thermal applications. A Joule heating of over 110 °C at 3 V direct current and a photothermal conversion over 60 °C under an optical power density of 100 mW/cm2 were achieved. These results indicated that the Ag/CNFs/BC films with nanomaterials have huge application potential as flexible wearable self-heating products with excellent electromagnetic shielding performances.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 2
·1-12
·
IF 2.8
Li Fei,Zhao Qian,Jia Rong,Hu Te,Lu Yun,Hao Liang
ZnO films immobilized on SUS316L wire mesh are prepared by a conventional low-temperature hydrothermal method. To improve their photocatalytic activity, we decorate the films with Ag nanospheres using the impregnating photoreduction treatment. The prepared films are characterized using a series of advanced analytical methods. The SEM and EDS results show that continuous films consisting of ZnO nanorods shaped as six-prism cones are formed in the hydrothermal process. Ag 0 nanospheres with the dimension from a few to several hundred nanometers decorate the ZnO nanorods. Compared to the individual ZnO film, Ag–ZnO heterojunction improves the absorption of UV and visible light, decreases the bandgap value, and shifts the band position toward more positive potentials. It also inhibits the recombination of photo-inspired electrons and holes, thereby improving the photodegradation ability. The photocatalytic performance of Ag–ZnO composite films increases at most 5.6-fold compared to the bare ZnO film. Active holes (h + ), superoxide ( \(\bullet {\text{O}}_{2}^{ - }\) ), and hydroxyl ( \(\bullet {\text{OH}}\) ) species play significant roles in organic dye RhB photodegradation under simulated sunlight irradiation.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 26
·期 2
·968-978
·
IF 9.8
Xinwei Wen,Yue Zhao,Puyang Fan,Jiajie Wu,Kai Xiong,Chang Liu,Qing Qu,Lei Li
The production of ammonia under ambient conditions has been a long-standing challenge for the chemical industry. The electroreduction of nitrate presents a promising solution for nitrate wastewater treatment and decentralized ammonia production. However, traditional Ag-based catalysts suffer from nitrate-to-nitrite conversion, leading to toxicity concerns and hampering ammonia preparation. In this study, we synthesized an innovative Ag–Cu–P catalyst that effectively tunes the d-band centre and electronic structure. The catalyst exhibited a remarkable NH4+ yield rate of 566.30 μmol cm−2 h−1 at −0.3 V (vs. RHE), reducing nitrite content to below the drinking water standard. Characterization results revealed a distinctive fern leaf-like morphology, providing an expanded active surface area. The challenge of facile nitrate conversion to nitrite on Ag-based catalysts has been addressed through the implementation of electronic structure modulation in this work. Theoretical calculations confirmed the substantial reduction in the energy barrier by modulating the d-band centre and electronic structure, facilitating the conversion of nitrite to ammonia. The regulation and analysis of d-band centres yielded valuable insights for catalyst material design. Meanwhile, direct evidence for potential intermediates has also been presented through in situ spectroscopy. These findings hold significant potential for practical applications, such as enhanced wastewater treatment and decentralized ammonia production, and provide support in the pressing need for sustainable ammonia synthesis under ambient conditions.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaolong Su,Yaling Zhai,Chao Jia,Zhe Xu,Dianfeng Luo,Zhiyi Pan,Hengxue Xiang,Senlong Yu,Liping Zhu,Meifang Zhu
In the post-epidemic era, bio-based protective fiber materials with active protective functions are of utmost importance, not only to combat the spread of pathogens but also to reduce the environmental impact of petroleum-based protective materials. Here, efficient antibacterial polylactic acid-based (PLA-based) fibers are prepared by solution blow spinning and their pore structures are regulated by controlling the ratio of the solvent components in the spinning solutions. The porous PLA-based fibers exhibit antibacterial efficiencies of over 99% against Escherichia coli and over 98% against Bacillus subtilis, which are significantly higher than that of the nonporous PLA-based fibers. The excellent antibacterial property of the porous PLA-based fibers can be attributed to their high porosity, which allows antibacterial nanoparticles to be released more easily from the fibers, thus effectively killing pathogenic microorganisms. Moreover, pore structure regulation can also enhance the mechanical property of the PLA-based fiber materials. Our approach of regulating the microstructure and properties of the PLA-based fibers through pore engineering can be extended to other polymer fiber materials and is suitable for polymer-based composite systems that require optimal performance through sufficient exposure of doped materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Juan Wang,Feilong Yin,Wenjing Tang,Nini Zhang,Liang Li,Shengbiao Zheng,Jing Tang,Jiahao Guo
The combination of metal organic framework (MOFs) with metal nanoparticles has great prospects for improving the electrochemical property of sensors. In this paper, silver (Ag) nanoparticles doping Co-based zeolitic imidazolate framework ( ZIF-67) composites (Ag-ZIF-67) were prepared by ultrasonic treatment of ZIF-67 and reduction of metal precursor (AgNO 3 ) in ZIF-67 material. Ag-ZIF-67 nanosheet material was obtained and characterized by transmission electron microscopy and electrochemical impedance spectroscopy. Due to the synergistic effect of high porosity and large specific surface area of ZIF-67, as well as the high electrical conductivity and prominent catalytic activity of Ag nanoparticles, Ag-ZIF-67 modified glassy carbon electrode showed excellent electrocatalytic activity for the detection of acetaminophen (AP) and caffeine (CAFF), including wide linear range (0.1–70.0 μM) for AP and (0.5–300.0 μM) for CAFF, high anti-interference ability. Additionally, the prepared Ag-ZIF-67 sensor also exhibited excellent selectivity for two compounds detection and prospective results in pharmaceutical formulations samples.
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Guojun Weng,Jianming Yang,Jianjun Li,Jian Zhu,Junwu Zhao
Surface-enhanced Raman scattering (SERS) based on rigid substrates has been widely used in biomedical detection due to its high sensitivity and specificity. However, the tedious operation steps for preparing SERS rigid substrates limited their applications in real-world detection. Compared with general rigid substrate, the flexible substrate has the advantages of simple preparation and easy portability, which are suitable for rapid, wearable and personalized detection in the field of point-of-care test. Herein, the flexible SERS substrates employing copolymer were fabricated and used for detection of skin cortisol, a biomarker for evaluating psychological stress in sweat. Silver triangle nanoplates with sharp corner were used as enhanced particles, and transferred to polyvinyl chloride/styrene-ethylene-butene-styrene copolymer (PVC/SEBS) film through three-phase interface self-assembly. By adjusting the size of silver nanoparticles, the ratio of PVC to SEBS in the polymer film, and the number of transfers of self-assembled silver films, the enhancement effect of the flexible SERS substrate was maximized. In addition, functionalization of the flexible SERS substrate with cortisol antibodies is used to achieve specific detection of cortisol on the skin surface. Under the optimal conditions, the Raman peak intensities at 1268 and 1500 cm −1 of the cortisol had a good linear relationship with the logarithm of its concentration in the range of 10 −7 to 10 −3 M, and the detection limits were 5.47 × 10 −8 M and 5.51 × 10 −8 M, respectively. The flexible silver triangle nanoplates SERS substrate constructed by self-assembly in the three-phase interface has the characteristics of good specificity and high sensitivity, which has potential for transdermal cortisol wearable detection, providing a feasible method for the rapid evaluating psychological stress level.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yuyun Wang,Guoliang Zhang,Duo Yang,Yang Li,Wei Yin,Yibin Weng
The low conductivity and poor antifriction performance of lubricants are the main causes of wear failure in mechanical equipment under electronic-control friction. Metal–organic framework (MOF) nanocomposites can be used to fabricate a new kind of lubricant additive. Herein, porous Cu-BTC@Ag MOF nanocrystals were successfully synthesized via an in situ generation method. Transmission electron microscopy results showed that the nano-Ag element was evenly dispersed throughout the Cu-BTC matrix. Cu-BTC@Ag nanocrystals can significantly improve the electrical conductivity of the EMI-BF4 ionic liquid, which increased by 38.8%. The average coefficients of friction (COF) and wear volume of EMI-BF4 ionic liquid with 0.5 wt % Cu-BTC@Ag decreased by 8.3 and 16% without applied voltage, respectively. This finding was due to the continuous extrusion of the EMI-BF4 stored in the Cu-BTC@Ag pores under external load. It entered the contact zone, thereby maintaining the continuous supply of lubricant. At 20 V applied voltage in the friction process, the COF of the EMI-BF4/2.0wt %Cu-BTC@Ag lubricant decreased by 18.8%, and its wear volume decreased by 32.7%. The Cu-BTC@ Ag nanocrystals adsorbed onto the metal surface to form a friction reaction film by the action of electric fields, which can repair the wear defects on the friction interface. Therefore, Cu-BTC@Ag nanocrystals acting as an additive in lubricant have remarkable prospects in the area of electronic-control friction.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）