ACS Applied Nano Materials
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2020
·
IF 0
Junping Li,Na Chen,Shupeng Liu,Zhenyi Chen,Yana Shang,Fufei Pang,Tingyun Wang
Direct detection of drugs in the blood contributes to the study of pharmacokinetics, whereas the low-concentration blood drug makes this goal challenging. Here, silver nanoparticles (AgNPs) are used for direct detection in the blood environment. The finite element method is used to study the electric field enhancement of AgNPs in the blood environment. We study the Raman enhancement factors associated with AgNPs and study the effects of parameters such as the wavelength, medium environment, and nanoparticle distribution on near-field enhancement. The method for directly detecting oxaprozin (OXA) drug in the blood of mice is reported, which is based on surface-enhanced Raman scattering (SERS) detection. We prepare AgNPs with a diameter of 15 nm and further concentrated them as a SERS substrate to achieve low-concentration OXA solution detection in blood and aqueous environments. The minimum detection limit in the aqueous environment is 10–6 M, and the detection limit in the blood is 10–4 M (29.32 μg/mL), which is less than the peak blood drug concentration in clinical applications. Further analysis shows that OXA in the blood can be directly detected by SERS because of the characteristic peak of 1025 cm–1, and the corresponding attribution is the C–C–C plane vibration. The numerical simulation of AgNPs and the detection of OXA solution in the blood environment indicate that SERS has a good application prospect in low-concentration blood drug detection.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yangmei Qin,Shizhao Jian,Ke Bai,Yuyang Wang,Zenghui Mai,Senqing Fan,Boya Qiu,Yu Chen,Yinan Wang,Zeyi Xiao
With the PTFE membrane as the substrate, a novel Ag-based catalytic membrane reactor (CMR) was fabricated by deep-permeation synthesis fabrication (DPSF). In DPSF, ZIF-8 was first assembled inside the membrane pores by permeation flow and the depositing reaction of Zn2+, and 2-methylimidazole solutions flow through the membrane synergistically. Then, Ag was reduced inside the pores impregnating ZIF-8 nanoclusters by Ag+ and reductant solutions flowing through the membrane similarly. The TEM images of the cross-sectional membrane exhibited the composite nanoparticles of Ag+ZIF-8 with good dispersion and size distribution (10–50 nm). The as-synthesized (Ag+ZIF-8)@PTFE was applied to the catalytic reduction of p-nitroaniline to p-phenylenediamine in a continuous flow-through reactor and presented remarkable catalyzing performance. The maximal apparent reaction rate constant is 3–4 orders of magnitude higher than that reported with good stability.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Saijiao Yang,Meiying Liu,Fengjie Deng,Liucheng Mao,Yiyang Yuan,Hongye Huang,Junyu Chen,Liangji Liu,Xiaoyong Zhang,Yen Wei
Highly sensitive and selective detection of specific DNA or metal ions based on sensor platform of dye-labeled single-stranded DNA (named as ssDNA) and functional materials has attracted great research interest over the past few decades. Herein, we reported for the first time that polydopamine (PDA) modified SiO 2 nanoparticles (PDA- co -SiO 2 NPs) could be severed as effective fluorescent quenchers for fabrication of fluorescent DNA sensor systems for detection of functional nuclear acids and Ag + . To prepare PDA- co -SiO 2 NPs, we just need mix SiO 2 nanoparticles with dopamine in aqueous solution under rather mild experimental conditions. These PDA- co -SiO 2 NPs-based sensor systems possess excellent sensitivity and selectivity, fast response for detection of target ssDNA and Ag + based on different fluorescence quenching effect of PDA- co -SiO 2 NPs towards ssDNA and dsDNA. Furthermore, the high fluorescence quenching ability of PDA- co -SiO 2 NPs allows quantitative detection of target ssDNA with a low detection limit of 1 nM. More importantly, this method would also be easily extended for preparation of many other PDA-based materials for fabrication of fluorescent DNA sensors owing to the universal attachment of PDA with various materials and surfaces. Therefore, this work will open up a new direction for analytical detection of PDA-based functional materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Wentao Ye,Yu Jiang,Qi Liu,Doudou Xu,En Zhang,XinWei Cheng,Zhou Wan,Chen Liu
Photocatalytic technology has been attracting considerable attention due to its low cost and environmental friendly properties. In this work, a novel ZnO/Ag 2 MoO 4 /Ag (ZAA) nanocomposite was prepared by an ultrasonic-irradiation method as an efficient visible-light-driven photocatalyst. The structure and photocatalytic property of the photocatalyst were studied by XRD , SEM, FTIR, XPS , TEM , UV–vis DRS and PL Spectroscopy, respectively. The results indicated that the Ag 2 MoO 4 nanocomposites were successfully decorated on the ZnO sheets which grabbed Ag NPs. Benefiting from local surface plasmon resonance effect of metallic silver and the formation of heterojunctions between the counterparts of ZnO and Ag 2 MoO 4 , it effectively suppresses recombination of photogenerated charge carriers, which can enhance good photocatalytic properties and antibacterial activities. An optimal photocatalysis of ZAA with molar ratio of ZnO to Ag 2 MoO 4 at 40:1 performed the highest degradation rate for rhodamine B under visible light irradiation. In addition, over 99.999% of Gram-negative E. coli and 99.846% of Gram-positive S. aureus were reduced by ZAA-40 nanocomposites within 60 min in comparison to pure ZnO sheet. These results demonstrate that ZAA is a promising photocatalyst, making it a prospective strategy to overcome current challengers in the use of organic pollutant degradation and the photocatalytic antibacterial area.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Siqi Tang,Hongmei Liu,Yiran Tian,Dong Chen,Chenjie Gu,Guodong Wei,Tao Jiang,Jun Zhou
Recently, it is urgent to ameliorate the accumulation and quantification performances of surface-enhanced Raman scattering-based lateral flow immunoassay (SERS-based LFIA) to promote its reliable clinical application. Herein, a smart hydrophilic-hydrophobic SERS-based LFIA strip was demonstrated by decorating Ag nanoplates with hydrophilic surface onto the specific regions of hydrophobic polymethylmethacrylate (PMMA) film with Raman internal standard (IS), which can unexpectedly inhibit the “coffee-ring phenomenon”. The target analytes were consequently enriched in the SERS-active Ag regions by the hydrophobic PMMA, considerably endowing the strip with amended quantitative monitoring ability. Aided by immunoprobes of flower-shaped Ag nanoplates, a limit of detection as 10 pg/mL and an outstanding correlation coefficient value (R 2 ) of 0.992 for carcinoembryonic antigen (CEA) were obtained by utilizing this SERS-based LFIA strip, which can be conducive to clinical monitoring and will broaden the field of vision for the point-of-care diagnostic technique.
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PubMed
高影响因子
Journal of Cleaner Production
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2021
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IF 9.297
Fengjiao Lai,Feng Yan,Pengju Wang,Chunyan Li,Xuehua Shen,Zuotai Zhang
The development of heterogeneously functional catalysts is of great significance in selective catalysis for biomass valorization. Herein, we report for the first time the applicability of chitin/Ag co-modified H 3 PW 12 O 40 composites (Chx-AgPW) as catalysts for producing valuable furans from carbohydrates and biomass. The as-prepared Ch15-AgPW catalyst exhibited the best catalytic performance, due to the dual Brǿnsted-Lewis acidity and appropriate chitin content. When the amount of Ch15-AgPW catalyst was 0.25 mmol, an excellent 5-hydroxymethylfurfural (HMF) yield of 78.3% could be achieved at 150 °C for 3 h with nearly 100% glucose conversion in the H 2 O/MIBK (V H2O:MIBK = 4:6) solvent system. Furthermore, high-yield HMF could also be obtained from other carbohydrates such as fructose (85.3%), sucrose (72.3%), cellobiose (65.6%), starch (52.7%) and inulin (43.5%). Additionally, corn stover , rice straw and sugarcane bagasse under typical reaction conditions simultaneously produced furfural and HMF in yields of 64.6%–72.2% and 18.5%–25.6%, respectively. Combined with the characterization, mechanism study demonstrated that the surface functional groups in chitin were conductive to rapid absorption of the substrates; the Brǿnsted acid sites from heteropoly anion (H 2 [PW 12 O 40 ] - ) promoted the initial depolymerization of biomass and the final dehydration to furans; the introduction of Ag + favored the isomerization of intermediates. After reaction finished, the Ch15-AgPW catalyst could be easily recovered by filtration and effectively reused at least eight cycles without substantial loss in catalytic activity . This work provides a novel strategy to synthesize stable heterogeneous catalysts with tunable acidity for producing bio-based fuels and chemicals from renewable resources .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yinchun Hu,Hui Yang,Renhu Wang,Menglan Duan
MOF-5 was prepared by hydrothermal method and Ag@MOF-5 nanoplates were obtained to improve the antibacterial activity and dispersion of Ag nanoparticles . MOF-5 and Ag@MOF-5 were characterized by scanning electron microscope (SEM), high-resolution transmission electron microscope and energy spectrum (HR-TEM&EDS), X-ray diffraction (XRD), infrared spectrum (FTIR) and thermal gravimetric analysis (TGA). MOF-5 was flaky crystals accumulated and complexed to form cube-like crystalline particles with the size of 20–50 micrometers, and it was destroyed in the process of loading nano-silver particles. Ag@MOF-5 nanoplates were nanoscale sheets, and 3–5 nm Ag nanoparticles were uniformly dispersed and loaded on nanoplates of MOF-5. The content of silver nanoparticles reached 13 wt% of Ag@MOF-5 total weight. The results of antibacterial experiment indicated that antibacterial ability of MOF-5 was limited, while Ag@MOF-5 showed good antibacterial ability to Escherichia coli and Staphylococcus aureus.
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高影响因子
Crystals
·
2021
·Vol. 11
·期 7
·769
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IF 2.589
Yazhou Qin,Binjie Wang,Yuanzhao Wu,Jiye Wang,Xingsen Zong,Weixuan Yao
Bimetallic nanoparticles have received extensive attention due to their unique physical and chemical properties, including enhanced optical properties, chemical stability, and better catalytic activity. In this article, we have successfully achieved the controllable preparation of Ag@Au nanoparticles via a seed-mediated growth method. By regulating the amount of seeds—silver nanospheres—we realized that Ag@Au nanoparticles gradually changed from spherical to a sea-urchin-like structure. The structure and composition of the prepared nanoparticles were characterized via scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and high-angle circular dark field scanning transmission electron microscopy (HAADF-STEM). In addition, we use the prepared Ag@Au nanoparticles as a substrate material for highly sensitive surface-enhanced Raman spectroscopy (SERS). Using 4-aminothiophenol (4-ATP) as the test molecule, we explored the SERS enhancement effects of Ag@Au nanoparticles with different structures. Furthermore, we used Ag@Au nanoparticles for SERS to detect the drug fentanyl, and realized the label-free detection of fentanyl, with the lowest detection concentration reaching 10−7M. This research not only provides a method for preparing bimetallic Ag@Au nanoparticles with different structures, but also provides a reference for the application of Ag@Au nanoparticles in the field of detection technology.Keywords:Ag@Au nanoparticle;core–shell structure;sea-urchin-like structure;SERS;fentanyl
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Yazhou Qin,Yuanzhao Wu,Binjie Wang,Jiye Wang,Weixun Yao
Compared with silver nanoparticles, gold nanoparticles have excellent chemical resistance and biocompatibility, while silver nanoparticles have more excellent local surface plasmon resonance characteristics than gold. In this article, we developed a simple method for growing island-shaped gold nanoparticles on the surface of silver nanowires (NWs), so that the prepared Ag@Au NWs have both the advantages of Au and Ag without their disadvantages. Furthermore, by changing the reaction parameters, we achieved the regulation of the density of island-shaped gold nanoparticles on the Ag NWs surface, thereby optimizing its LSPR performance. We use the prepared Ag@Au NWs as the base material for highly sensitive Surface enhanced Raman scattering (SERS) detection. By using 4-aminothiophenol (4-ATP) as the test molecule to explore the uniformity of the prepared SERS substrate, the detection limit of 4-ATP reached 10 -9 M. And 10 points were randomly selected for testing and the RSD was 7.4%, indicating the Ag@Au NWs SERS substrates had excellent uniformity. Furthermore, we have achieved highly sensitive SERS detection of 5 tropane alkaloids including L -Hyoscyamine, Anisodamine, Scopolamine Hydrobromide, scopolamine methyl bromide and scopolamine butyrate bromide. The limit of detection is 10 -9 M, 10 -10 M, 10 -9 M, 10 -9 M and 10 -10 M. Furthermore, by analyzing the obtained SERS spectra, we realized the differentiation of 5 kinds of tropane alkaloids by their characteristic peaks.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 55
·34516-34524
·
IF 3.361
Qi Zhang,Tian-Song Deng,Ming-Zhang Wei,Xi Chen,Zhiqun Cheng,Shiqi Li,Yi-Jie Gu
The plasmonic properties of noble metallic nanoparticles could be tuned by morphology and composition, enabling opportunities for applications in sensors, photocatalysis, biomedicine, and energy conversion. Here, we report a method of the symmetric and asymmetric overgrowth of a Ag shell onto gold nanorods assisted by Pt pre-deposition via a 2-step approach. Firstly, gold nanorods (AuNRs), synthesized via a seed-mediated method, were used as seeds to form a AuNR–Pt structure, by using K2PtCl4 as the precursor. In this step, most of the Pt material was selectively deposited on the tips of the AuNR. Secondly, by using AgNO3 as the precursor, a Ag shell was overgrown on the surface of the AuNRs–Pt nanoparticles, resulting in a (AuNR–Pt)–Ag core–shell tri-metallic nanostructure. Due to the surface energy and lattice matching between Au and Ag, the Ag shell preferred to be epitaxially overgrown on the side of AuNR. The Ag shell thickness and symmetry of the (AuNR–Pt)–Ag could be tuned by changing the amounts of AgNO3 precursor. With the increase of the Ag shell thickness, the (AuNR–Pt)–Ag nanostructures changed from symmetric to asymmetric. The obtained (AuNR–Pt)–Ag nanostructures were studied using UV-vis-NIR spectroscopy, transmission electron microscopy, EDS mapping, DLS, and ICP-MS. The growth mechanism was discussed.
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高影响因子
PROCESS BIOCHEMISTRY
·
2019
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IF 2.883
Bing Zhang,Yejing Jia,Jing Wang,Honghong Chang,Zhihuan Zhao,Yan Cheng
Under the limitations of advanced instruments and professional operations, straightforward readouts play an increasingly vital role in immunoassays. Herein, a Ag 2 CO 3 @Ag nanocomposite-mediated colorimetric and photothermal immunoassay was developed to detect carcinoembryonic antigen (CEA). The Ag 2 CO 3 @Ag nanocomposites could oxidize 3,3’,5,5’-tetramethylbenzidine to form blue oxidation products (TMB ox ) due to the acidic dissolution of Ag 2 CO 3 under acidic conditions. TMB ox presented a strong photothermal effect driven by a near-infrared (NIR) laser. Therefore, TMB ox could act as a photothermal probe to convert immunoassay signals into thermal signals. The Ag 2 CO 3 @Ag nanocomposite was characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRD). Then, a sandwich-type immunoassay was built on the surface of a magnetic bead, and CEA was quantified using a common thermometer based on the photothermal effect. Under optimal conditions, the temperature increased with increase of CEA concentrations in the range of 0.1 ng/mL–5 ng/mL. More importantly, this system exhibited high selectivity, good repeatability and outstanding stability.
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 12
·125405
·
IF 3.551
Yuzhu Guan,Peiyuan Ji,Jing Wan,Dazhi Zhang,Zhao Wang,Hao Tian,Chenguo Hu,Baoshan Hu,Qing Tang,Yi Xi
By exploiting the storage performance of supercapacitors, iron has the potential to be used as a new anode material. However, this potential is limited by unsatisfactory electrical conductivity and poor cycling stability which impact the energy and power density. Consequently a foundation for improving the electrical conductivity and cycling stability of iron materials to obtain good storage performance is needed. In this work, Ag-modified Fe2O3 nanoparticles on carbon cloth were synthesized as an anode material for supercapacitors. The specific capacitance of the composite material reaches 10.39 F cm−2 (2734.2 F g−1) at a current density of 1 mA cm−2 and remains at 83% of this value after 12 000 cycles. The energy density is 379.8 Wh kg−1 at a power density of 131.6 W kg−1 and remains at 123.9 Wh kg−1 at a power density of 2631.6 W kg−1. The electrical conductivity and interfacial effect created between Ag@Fe2O3 is confirmed with density functional theory calculations. The packaged asymmetric supercapacitor devices have flexibility and can light ten LEDs for 2 min 30 s, with an energy density of 60.3 Wh kg−1 that can be reached at a power density of 1063.8 W kg−1 and remain at 16 Wh kg−1 even at a power density of 4255.3 W kg−1.
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高影响因子
危险品化学品经营许可证（带存储）