CRYSTENGCOMM
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2013
·Vol. 15
·期 32
·6368-6373
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IF 3.879
Shuling Xu,Lei Wang,Haibo Li,Qiaoli Yue,Rui Li,Jifeng Liu,Xiaohong Gu,Shuqiu Zhang
Novel three-dimensional Ag nanoflowers (3DAN) were successfully synthesized through a facile Cu2+ mediated solution method using N,N-dimethylformamide (DMF), which serves as both a reducing agent and a solvent at room temperature. It was found that the introduction of a trace amount of Cu2+ could greatly slow the rate of the Ag+ reaction and thus this process effectively reduced the growth speed of Ag nanoparticles allowing 3DAN to be formed. The mechanism underlying the self-assembly process and shape evolution of 3DAN were systematically investigated by varying reaction time. X-Ray powder diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) were used to characterize the structure and morphology of the obtained products. X-Ray photoelectron spectroscopy (XPS) was used to assess the chemical state and surface composition of the 3DAN. UV-vis absorption spectra of the products collected from the reaction solution at various stages were taken to study their optical properties. In the measurement of surface-enhanced Raman scattering using rhodamine 6G (R6G) as the probe, the 3DAN exhibited a significant enhancement factor, indicating their potential applications in biosensing and nanodevices.
研究领域:
纳米医学
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生物传感
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材料科学
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胶体化学
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分子影像学
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2015
·Vol. 41
·期 2
·944-950
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IF 3.313
Ning-Zhao Shang,Cheng Feng,Shu-Tao Gao,Chun Wang
In this study, a bi-metal based nanocatalyst (AgPd@UIO-66-NH 2 ) was synthesized by immobilizing AgPd nanoparticles onto the amino-functionalized metal-organic framework material (UIO-66-NH 2 ). The catalytic activity of AgPd@UIO-66-NH 2 for the hydrolysis of ammonia borane was evaluated. Among all the prepared AgPd@UIO-66-NH 2 catalysts, the Ag 1 Pd 4 @UIO-66-NH 2 exhibited the highest catalytic activity for the hydrolysis of ammonia borane with a turnover frequency value of 90 mol H 2 mol catalyst −1 min −1 , which is among the higher value of the previous reports.
研究领域:
材料科学
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催化化学
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纳米技术
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氢能
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ACS Applied Nano Materials
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2023
·
IF 5.9
Li Sun,Chunlai Cao,Yuan Zhi,Yuejin Shan,Hua Zhang,Binlin Dou,Lixin Zhang,Weijia Huang
Surface-enhanced Raman scattering (SERS) technique has been limitedly applied to the detection of trace thiram due to the weak activity of employed substrates. In this work, Au–Ag nanoparticles (NPs) with controllable morphologies are synthesized and used as SERS-active substrates for the detection of trace thiram. Porous–spiny Au–Ag NPs are synthesized with spherical Ag NPs as intermediates through in situ redox. Annular Au–Ag NPs can be further obtained by heating porous–spiny Au–Ag NPs. Here, the morphology transformation of Au–Ag NPs is first completed by means of the element diffusion theory, providing a strategy for the morphology control of complex Au–Ag NPs. Additionally, these Au–Ag NPs with optimized morphologies were chosen as substrates for the successful SERS detection of trace thiram. Especially, porous–spiny Au–Ag NPs show superior sensitivity and reproducibility. Meanwhile, using porous–spiny Au–Ag NPs as SERS-active substrates, thiram can be quantitatively detected in the range from 10–3 to 10–11 M. Thus, it is inferred that Au–Ag NPs with optimized morphologies will have great potential in the field of trace analyte detection related to food safety and environmental protection.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Di Liu,Huimin Gao,Wenji Jiang,Su Yan,Hao Liu,Junjie Chen,Sisi Wen,Wei Zhang,Xu Wang,Bing Zhao,Wei Song
In this work, three-dimensional (3D) Ag aerogel-supported Hg single-atom catalysts (SACs) were explored as an efficient surface-enhanced Raman scattering (SERS) substrate to monitor the enhanced oxidase-like reaction. The influence of the concentrations of Hg2+ to prepare 3D Hg/Ag aerogel networks on their SERS properties to monitor the oxidase-like reaction has been investigated, and a specific enhancement with an optimized addition of Hg2+ has been achieved. The formation of Ag-supported Hg SACs with the optimized Hg2+ addition was identified from a high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) image and X-ray photoelectron spectroscopy (XPS) measurement at an atomic level. This is the first discovery of Hg SACs for enzyme-like reaction applications inferred by SERS techniques. And density functional theory (DFT) was used to further reveal the oxidase-like catalytic mechanism of Hg/Ag SACs. This study provides a mild synthetic strategy to fabricate Ag aerogel-supported Hg single atoms to display promising prospects in various catalytic fields.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Wenxiu Wu,Naiyuan Guo,Yixuan Zhang,Guoxu Liu,Leiting Yu,Xiaowei Ma,Wei Li,Minfang Chen
A suitable conductive ink for office inkjet printers is important for the convenient design of flexible electrodes for triboelectric nanogenerators (TENG). Ag nanowires (Ag NWs) easily printed with an average short length of 1.65 μm were synthesized by using soluble NaCl as a growth regulator and adjusting the amount of chloride ion. The water-based Ag NWs ink with a low solid content of 1% but with low resistivity was produced. The printed flexible Ag NWs-based electrodes/circuits showed excellent conductivity with RS/R0 values kept at 1.03 after bending 50,000 times on PI substrate and an excellent anticlimate property in acidic conditions for 180 h on polyester woven fabric. The sheet resistance was reduced to 4.98 Ω/sqr heated at 30–50 °C for 3 min by a blower due to the formed excellent conductive network when compared to Ag NPs-based electrodes. Finally, the integration of printed Ag NWs electrode and circuits was applied to the TENG, which can be used to predict a robot’s out-of-balance direction by the change of the TENG signal. In all, a suitable conductive ink with a short length of Ag NWs was fabricated, and flexible electrodes/circuits can be conveniently and easily printed by office inkjet printers.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Jing Sun,Zhichang Ma,Hemeiling Cai,Junwei Di
A photoelectrochemical dopamine sensor based on BiOI and AuAgNPs nanoparticles modified indium tin oxide (ITO) electrode was prepared successfully. The noble metal material AuAg significantly improved the shortcomings of poor surface conductivity and easy recombination of photogenerated electron holes in BiOI. The prepared electrode generated a significantly enhanced and stable photocurrent signal under Xe lamp irradiation. In addition, in weak acidic electrolyte solution , dopamine molecules were protonated and preferent existed in the form of cations, which were easily attracted by electrostatic and adsorbed on the surface of negatively charged AuAgNPs. As an electron donor , DA is vulnerable to oxidation to DA + by BiOI holes, resulting in an increased anodic photocurrent. The detection limit was 0.3 pM (S/N = 3) and the dopamine concentration exhibited a nice linear relationship between 1 pM and 0.1 μM under ideal circumstances. The dopamine photoelectrochemical sensor shown strong sensitivity, a broad linearity range, and good selectivity against potential uric acid and ascorbic acid interference. This work provides a promising PEC detection platform for the detection of small and medium-sized molecules in biological analysis.
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ACS Applied Materials & Interfaces
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2023
·
IF 9.5
Chunxue Zheng,Jie Yu,Liguang Dou,Zhen Wang,Zhulin Huang,Xinyang Li,Xiaoye Hu,Yue Li
Surface-enhanced Raman scattering (SERS), an ultra-sensitive and non-destructive analytic technique, has attracted wide attention from the scientific community. Despite its rapid development, limited hotspots on the SERS substrates have restricted their potential in practical applications. Herein, we developed a facile method to fabricate a flexible three-dimensional (3D) SERS substrate composed of silver nanoparticles (Ag NPs)-loaded carbon aerogels (CAs). Such a flexible Ag NPs/CAs substrate exhibited numerous hotspots, which can facilely be adjusted not only by tuning the density of Ag NPs but also by controlling the bending degree of the flexible substrate. In addition, the influence of hotspots on the local electric field enhancement was investigated by theoretical calculations. Moreover, the 3D network structure of the CAs with a large specific surface area and strong adsorption ability can improve the capture of target molecules. Consequently, the optimal Ag NPs/CAs substrate has a low detection limit of 10–12 M for rhodamine 6G molecules as well as good repeatability. Furthermore, based on the good performance of SERS detection of the Ag NPs/CAs substrate, it can also be practically used for the detection of thiram molecules on the surface of cherry tomatoes. Such a flexible 3D Ag NPs/CAs substrate has great potential for practical environmental monitoring applications.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Dingming Yu,Lifang Liu,Bin Ding,Jianyong Yu,Yang Si
Water-borne pathogenic diseases significantly threaten human health and the global economy, and traditional water disinfection strategies such as chlorination or membrane filtration to remove pathogens still suffer from harmful byproducts, biofouling, and limited handling capacity. Here, a bottom-up strategy is reported to develop biomimetic nanofibrous aerogels with superelastic and conductive networks by assembling Ag nanowires in a 3D SiO 2 nanofibrous skeleton via freeze-drying method for safe and efficient water disinfection. Inspired by the prey capture behavior of spiders using their webs, the core of this design is constructing spanning and interconnected networks with millions of conductive nanotips, which could inactivate microbes instantaneously based on the synergistic effect of interception and electroporation. Benefitting from the high porosity (99.81 %), superelasticity, and robust structural stability of the resultant aerogels, an electroporation-disinfection device (EDD) equipped with aerogels exhibits superior bactericidal (>99.9999 %) and virucidal (>99.9 %) performances at low derive voltage (1 V) and high flux (9900 L m −2 h −1 ) with energy consumption of 0.83 Wh m −3 . This novel disinfection method provides new insights into practical water treatment in an efficient, environmental, and sustainable way.
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Biosensors-Basel
·
2022
·Vol. 12
·期 12
·1108
·
IF 5.743
Ding Wang,Yiru Zhao,Shen Zhang,Liping Bao,Huijun Li,Jingcheng Xu,Bin He,Xumin Hou
Rapid and accurate detection of acute myocardial infarction can improve patients’ chances of survival. Cardiac troponin I (cTn I) is an important diagnostic biomarker for acute myocardial infarction. However, current immunoassays are insufficient to accurately measure cTn I, as they have limited detection sensitivity and are time-consuming. Surface-enhanced Raman scattering (SERS) is a brilliant fingerprints diagnostic technique characterised by ultrasensitivity, fast response, and qualitative and quantitative analysis capabilities. In this study, reporter molecules (4-Mercaptobenzoic acid, 4-MBA) embedded[email protected]core-shell nanospheres as SERS nanotags were prepared for the detection of cTn I. As the Raman reporters were embedded between the core and the shell, they could be protected from the external environment and nanoparticle aggregation. Excellent SERS performances were obtained due to the enhanced local electromagnetic field in the gap of core and shell metals. In a standard phosphate buffered saline (PBS) environment, the limit of detection for cTn I was 0.0086 ng mL−1(8.6 ppt) with a good linear relationship. The excellent Raman detection performance was attributed to the localized surface plasmon resonance effect and strong electromagnetic field enhancement effect produced by the gap between the Au core and the Ag shell. The SERS nanotags we prepared were facile to synthesize, and the analysis procedure could be completed quickly (15 min), which made the detection of cTn I faster. Therefore, the proposed SERS nanotags have significant potential to be a faster and more accurate tool for acute myocardial infarction diagnostics.Keywords:[email protected]nanospheres;GERTs;SERS;cTn I detection;AMI
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Surfaces and Interfaces
·
2023
·
IF 6.2
Zhihong Wang,Minghao Shang,Honglei Chen,Tiexin Sun,Bohao Zhang,Yaohui Zhang,Kongfa Chen,Zhe Lv
Nanoporous metals with high specific surface area, excellent conductivity, and unique surface structure have attracted attention in a variety of applications such as catalysis, energy storage, and sensing. However, there is a significant challenge for the fabrication of uniform nanoporous architectures in metals through a simple and cost-effective process. In this study, we report a facile approach to create monolithic nanoporous Ag (MNPA) from the direct reduction of insoluble Ag 2 O precursor in an aqueous solution, fundamentally avoiding the introduction of secondary components and complex preparation of precursors. The formation of porous structures is attributed not only to the volume shrinkage but also to the spontaneous reconstruction of reserved Ag atoms during the reduction process. Furthermore, for a typical application, the optimized MNPA with a small grain size (∼113 nm) is used as a surface-enhanced Raman scattering (SERS) substrate, which exhibits ultrahigh SERS sensitivity with an enhancement factor of ∼10 9 .
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Analytical Methods
·
2023
·Vol. 15
·期 6
·771-777
·
IF 3.1
Ying-Hua Zhou,Chen-Chen Jiang,Zhou Yu,Ya-Hao Wang,Ju-Fang Zheng,Xiao-Shun Zhou
Electroreductive dehalogenation as an efficient and green approach has attracted much attention in pollution remediation. Herein, we have employed a shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) technique to in situ probe the electroreductive dehalogenation process of aryl halides with thiol groups at Ag/aqueous solution interfaces. It is found that 4-bromothiophenol (BTP) and 4-chlorothiophenol (CTP) can turn into mixed products of 4,4′-biphenyldithiol (BPDT) and thiophenol (TP) as the electrode potential decreases. The conversion ratios estimated from the Raman intensity variations of C–Cl and C–Br vibrations are 44% and 58% for CTP and BTP in neutral solution, respectively. Furthermore, the quantitative analysis of benzene ring vibrations reveals a C–C cross coupling between the benzene free radical intermediate and adjacent TP product, which results in increased selectivity for biphenyl products at negative potentials.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2023
·
IF 5.8
Xinyu Cui,Minghui Li,Lei Tong,Miaojing Li,Xuefeng Tang,Xiaojun Han
Chemodynamic therapy (CDT) is based on the endogenous generation of cytotoxic hydroxyl free radicals (·OH) with high specificity and selectivity between cancer and normal cells. However, its efficacy is often limited by the relatively deficient catalytic activity of nanozymes in the tumor microenvironment (TME). Therefore, the combination of CDT with other strategy to realize synergistic therapy is necessary. Herein, a versatile plasmonic Au/Ag nanorods (abbreviated as Au/Ag NRs) via anisotropic Ag overgrowth on Au nanobipyramids was rationally devised to achieve synergistic nanozyme catalytic therapy and near infrared II (NIR-II) light induced photothermal therapy (PTT) with the guidance of computed tomography (CT) imaging. As TME contains high concentrations of H + and H 2 O 2 , Au/Ag NRs exhibited peroxidase (POD) activity to catalyze H 2 O 2 to produce ·OH, inducing cancer cell death. Meanwhile, Au/Ag NRs showed a preeminent NIR-II photothermal effect. More importantly, the enhanced ·OH generation by in-situ heating up resulting from PTT could conversely inhibit the expression of heat shock proteins (HSPs) to abate their resistance to PTT, realizing self-augmented synergistic effect. The NIR-II photothermally enhanced nanozyme catalytic cancer therapy validly inhibited the cancer proliferation, as demonstrated via both cell and animal assays. Moreover, ideal high-contrast CT imaging was realized, owing to the X-ray attenuation capability of elemental Au. The multifunctional Au/Ag NRs hold potential in oncotherapy with imaging capability, high efficiency and low side effects.
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