Analytical Methods
·
2021
·Vol. 13
·期 29
·3274-3281
·
IF 2.896
Chengshan Fan,Xin Zhang,Jia Meng Lv,Jiahao Bai,Zenghui Qiu,Yong Mei Zhao,Zheng Long Wu,Hai Jun Xu
Accurate detection of mercury ions (Hg2+) in water is of great importance for environmental protection. Here, a surface-enhanced Raman scattering (SERS) sensor using bovine-serum-albumin-modified gold-silicon nanowire arrays (Au@SiNWAs) is used to detect the ions. The SiNWAs were grown via chemical etching; the addition of modified gold particles on the surface formed Au@SiNWAs to increase the surface activity. The Raman enhancement factor was as large as ∼2.52 × 105, which was also confirmed with finite-difference time-domain simulations. The detection limit for Hg2+ ions in water was as low as ∼10−12 M, which is much lower than that stipulated by the United States Environmental Protection Agency's maximum residue requirements for drinking water. Furthermore, the SERS intensity was linear with the log of the Hg2+ concentration between 1 pM and 100 nM, with a correlation coefficient of 0.992. There was no significant interference when other metal ions were present, which shows the excellent selectivity of the SERS sensor. Unknown Hg2+ concentrations in water can be readily determined in an accurate and reliable manner, with a relative standard deviation of ∼9.21%.
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Environmental Science-Nano
·
2021
·Vol. 8
·期 7
·1978-1991
·
IF 8.131
Ming Yan,Yilin Wu,Rongxin Lin,Faguang Ma,Zhongyi Jiang
Although many researchers have done several studies on improving the selective separation performance of membrane materials, the conceptions and applications of membrane-based molecular imprinting separation and recognition with both high permselectivity and rebinding capacity have still faced challenges. Herein, for the first time, the bioinspired polydopamine (PDA)-modified porous regenerated cellulose membrane (pRCMs) with Au-based imprinting structure was constructed for the synthesis of molecularly imprinted nanocomposite membranes (MINMs); propranolol was used as template molecule. Importantly, based on the as-constructed PDA-modified layers, abundant Au-modified particles have been uniformly distributed onto the surfaces of membranes, and Au/PDA-based structures can be used as the imprinted-initiated factors for the preparation of sandwich-like-imprinted sites by developing a two-step temperature propranolol-imprinting method. Moreover, superior rebinding capacity (76.87 mg g−1) and selectivity (4.27–4.56) of MINMs has been successfully achieved; the as-prepared MINMs also showed excellent regeneration and permselectivity of propranolol (16.01–18.34) by constructing large amounts of propranolol-imprinted sites on the Au/PDA-based surface. Therefore, under optimized conditions, MINMs would finally obtain reproducible, accessible, and stable membrane-based separation system of the propranolol molecule.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Congming Sun,Weiru Dong,Junxiang Peng,Xiaoliang Wan,Zhenli Sun,Dehao Li,Suhua Wang
Increasingly serious uranium pollution necessitates a new method for rapid qualitative and quantitative uranium detection. Some methods based on fluorescence spectroscopy and surface-enhanced Raman scattering (SERS) have been reported to detect uranyl ions (UO 2 2+ ), the main species of uranium. However, various factors affect the fluorescence selectivity and SERS quantitative analysis. Herein we report on a composite material for a dual-mode fluorescence–SERS detection protocol for simultaneous quantitative and qualitative analysis of UO 2 2+ , based on a layer-by-layer assembly strategy, combining the advantages of the two complementary techniques. The composite material consists of a Fe 3 O 4 @SiO 2 core coated by gold nanoparticles (FA) via electrostatic adsorption. The CdTe quantum dots (CdTe QDs) outside the FA are linked with amide bonds to form a satellite Fe 3 O 4 -Au@CdTe nanostructure (FA-CdTe). The fluorescence signal of FA-CdTe was selectively quenched by UO 2 2+ , with a detection limit as low as 1.2 nM; the material was also used as a SERS substrate to detect the Raman mode of uranyl at 828 cm −1 . Furthermore, this method has been applied for UO 2 2+ detection in seawater, river water, and tap water, demonstrating the broad application prospects and providing novel development concepts.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-10
·
IF 6.232
Cao Liangli,Xiao Haolin,Fang Cheng,Zhao Feijun,Chen Zhencheng
Using gold and magnetic nanoparticles co-decorated reduced graphene oxide-tetraethylenepentamine (rGO-TEPA/Au-MNPs) as the magnetic platform for capturing the primary antibody (Ab 1 ), separation and preconcentration of immunocomplex, a novel homogeneous electrochemical immunosensor was successfully developed. The newly prepared magnetic rGO-TEPA/Au-MNPs, compared with MNPs, exhibited better stability and enhanced electrical conductivity attributed to rGO-TEPA, and showed higher biorecognition efficiency due to AuNPs. In addition, Au@PtNPs were prepared and modified with secondary antibody (Ab 2 ) as an efficient signal probe for signal readout. Using carcinoembryonic antigen (CEA) as a model analyte, the prepared immunosensor demonstrated satisfactory properties like high stability, good repeatability and selectivity, wide linear range (5.0 pg mL −1 ~200.0 ng mL −1 ) as well as low detection limit (1.42 pg mL −1 ). The homogenous electrochemical immunosensor was applied to the detection of CEA in human serum and was found to exhibit good correlation with the reference method. Thus, the proposed rGO-TEPA/Au-MNPs-based homogenous immunoassay platform might open up a new way for biomarker diagnosis.
Graphical Abstract
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Lihong Su,Lulu Wang,Jingke Xu,Zonghan Wang,Xiaolin Yao,Jing Sun,Jianlong Wang,Daohong Zhang
Gold nanoparticles (AuNPs) are the most commonly used signal materials in lateral flow immunoassay (LFIA). However, the assay sensitivity of traditional AuNP-based LFIA is usually limited by the incomplete competition between free target analytes and immobilized antigens for the binding of AuNP-labeled antibodies. To unfreeze this limitation, here, asymmetric Au–SiO2 Janus NPs (about 66 nm) were designed and synthesized. Au–SiO2 Janus NPs can assemble into snowman-like anisotropic structures and combine two different physicochemical properties at their opposite sides, where the AuNP side mainly possesses the antibody conjugating and signal providing functions and the SiO2 side primarily offers the stable function. In virtue of the unique asymmetric nanostructure, only the AuNP side can interact with target analytes by specific antigen–antibody interactions, which could significantly improve the efficiency of competition. Selecting furazolidone as a model analyte, the immunoassay biosensor showed a limit of detection as low as 0.08 ng/mL, 10-fold decreased than that of the AuNPs-LFIA. Moreover, the Au–SiO2 Janus NP lateral flow immunoassay was well applied in chicken, pork, honey, and beef food samples with visual detection limits of 0.8 ng/g, 0.16 ng/g, 0.4 ng/mL, and 0.16 ng/g, respectively. The Au–SiO2 Janus NPs possess the advantages of both materials, which will broaden their applications as a potential alternative in the rapid and sensitive detection of antibiotic residues.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-11
·
IF 6.232
Li Fang,Hu Yuting,Zhao Anqi,Xi Yachao,Li Zimu,He Jianbao
β -cyclodextrin-functionalized porous
Pd@Au nanostructures ( β -CD-Pd@Au) with intrinsic
and enhanced peroxidase-like activity were successfully synthesized by a two-step
method. The synthesized β -CD-Pd@Au can
efficiently catalyze the oxidation of various substrates, such as
3,3′,5,5′-tetramethylbenzidine (TMB), mixture of 4-amino antipyrine (4-AAP) and
3,5-dichloro-2-hydroxy acid sodium (DHBS) (4-AAP/DHBS), and mixture of 4-AAP and
N-Ethyl-N-(3-sulfopropyl)-3-methyl-aniline sodium salt (TOPS) (4-AAP/TOPS), by
H 2 O 2 to generate visual blue,
purple, and pink color, respectively. The UV-vis absorbance peak of the three β -CD-Pd@Au catalyzed the chromogenic reaction
system located at 650 nm, 510 nm, and 550 nm, respectively. The β -CD-Pd@Au-catalyzed
TMB-H 2 O 2 chromogenic reaction
exhibited higher absorbance intensity, catalytic efficiency, and color stability in
comparison to 4-AAP/DHBS-H 2 O 2 and
4-AAP/TOPS-H 2 O 2 chromogenic
reactions. The catalytic activity of β -CD-Pd@Au
was enhanced about 4-fold compared to that of Pd@Au in terms of
K cat for
H 2 O 2 . Using TMB as chromogenic
substrate, a colorimetric assay was fabricated for the determination of
H 2 O 2 with a detection limit of
2.78 μM (absorbance at 650 nm). The colorimetric determination of glucose with a
detection limit of 9.28 μM was further achieved by coupling with glucose oxidase
enzymatic reaction, indicating the versatility of the β -CD-Pd@Au-based detection strategy. A paper-based detection method
coupled with smartphone for fast visual and instrument-free detection of glucose was
further developed. Finally, the developed colorimetric assay and paper-based
detection method were successfully applied to the determination of glucose in human
serum sample.
Graphical abstract
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 27
·11808-11816
·
IF 3.288
Shi-Yuan Zhang,Jing-Jing Ma,Hong-Lin Zhu,Yue-Qing Zheng
Syngas, as a necessary feedstock dependent on non-renewable fossil fuels, is a mixture of CO and H2, which could be prepared by a renewable strategy via electrochemical CO2 reduction in water electrolyte solutions. Herein, beaded Au@Co3O4 nanowire arrays (denoted as Au@Co3O4 NAs) were obtained by immersion in HAuCl4 solution with Co3O4 nanowire arrays. The Au@Co3O4 NAs exhibited outstanding electrochemical performance of producing syngas via tuning from 1 : 1 to 4 : 1 with controlling voltage. In addition, the Au@Co3O4 NAs showed better catalytic performance for the oxygen evolution reaction with an overpotential of 320 mV at a current density of 50 mA cm−2, along with a small Tafel slope of 75 mV dec−1 in 1 M KOH solution. The electrochemical performance of Au@Co3O4 NAs is obviously superior to Co3O4 NAs, which will open up a viable strategy for the design and fabrication of a bi-functional electrocatalyst for the overall reaction (CO2 + H2O → CO + H2 + O2).
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Qing Huang,Wenjie Zhu,Yong Wang,Zhao Deng,Zhi Li,Jiankun Peng,Dajuan Lyu,Elfed Lewis,Minghong Yang
This article presents for the first time an ultrasensitive localized surface plasmon resonance (LSPR) sensor system based on multimode-singlemode-multimode fiber (MMF-SMF-MMF) structure for the accurate measurement of copper (II) Ion (Cu 2+ ). Citrate-stabilized Au@AgPt core-shell nanospheres (NSs) with a rough AgPt alloy outer shell were synthesized in house, and then adhered onto the sensing section of MMF-SMF-MMF structure through silane coupling agent. Finally, the Au@AgPt NSs-coated optical fiber probe surface was covered with a layer of PEI as the chelating agent for specific Cu 2+ trapping. The detection process of Cu 2+ is conducted by monitoring the resonance intensity variation of the transmission spectrum, which is due to the local refractive index changes result- ing from the specific interactions between Cu 2+ in solution and PEI immobilized on the sensor surface. The proposed PEI-Au@AgPt NSs modified fiber sensor achieved an ultralow Cu 2+ detection level down to 10 −16 mol/L. The facile fabrication, pollution-free, high sensitivity and cost-effectiveness of the optical fiber sensor system make it rather promising for the precise Cu 2+ monitoring in a wide range of biological application scenarios.
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MATERIALS LETTERS
·
2020
·
IF 3.204
Jun Zhu,Gongguo Zhang,Weiwei Chang,Xiaoqian Luan,Fengli Qu,Yiqun Zheng
We report a facile synthesis of silver nanorods/nanowires with the diameter in the range of sub-20 nm via seeded growth. The key to the success of this work relies on the use of tiny Au seeds and manipulation over reaction kinetics. In particular, their diameter could be controlled to as small as 12 nm using 5-nm spherical Au seeds. They can be further converted to trimetallic (Au@Ag-Pd) hollow derivatives with tunable hollow degree and elemental compositions by galvanic replacement reaction.
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Materials Today Communications
·
2020
·
IF 2.678
Jian-Jun Li,Xiao-Hong Chen,Guo-Jun Weng,Jian Zhu,Jun-Wu Zhao
The fluorescence quenching properties of Ag-coated Au tetrapod nanostars have been studied via fluorescence spectroscopic techniques. Because of the intense plasmonic light absorption and the corresponding fluorescence resonance energy transfer (FRET), the fluorescence quenching effect of Au tetrapod nanostars could be greatly enhanced by Ag coating. What’s more, the fluorescence quenching ability of Ag-coated Au tetrapod nanostars could be further increased by tuning the size of inner Au tetrapod nanostars or the thickness of the outer Ag coating. In the study of carcinoembryonic antigen (CEA) detection based on the fluorescence probe of Ag-coated Au tetrapod nanostars, surface modification of antibody conjugation has been carried out to guarantee the specificity. Under the optimized conditions, the fluorescence efficiency of the Ag-coated Au tetrapod nanostars probe exhibits a linear response to CEA concentration ranging from 10−280 pg/mL, and the corresponding theoretical detection limit (LOD) is as low as 8.2 pg/mL. Interference experiment results shows that the influence from the interfering proteins could be neglected in the detection, and it has been successfully applied to detect CEA in real samples. Compared with other optical detection techniques of CEA, this method based on fluorescence quenching of Ag-coated Au tetrapod nanostars has better performance because of the special geometry features including regular tips and Ag coating.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Qixia Guan,Hao Guo,Ning Wu,Yujuan Cao,Mingyue Wang,Longwen Zhang,Wu Yang
As a new kind of porous organic material, covalent organic framework materials (COFs) have many advantages and have been widely used in catalysis, sensing, drug delivery, gas separation and other fields. In this paper, A COF was successfully prepared based on Schiff base reaction of 1, 3, 6, 8-tetrakis(4-formyl phenyl) pyrene (TFPPy) and 1, 3, 6, 8-tetrakis(4-amino phenyl) pyrene (PyTTA) named as TF-Py COF, and its structure was characterized in detail. By physically combining a pre-prepared three-dimensional carbon material containing nitrogen (3D NCNF-T) and TF-Py COF, followed by deposition of AuNPs, relatively poor conductivity of TF-Py COF was efficiently overcome and a novel electrochemical sensing platform with high sensitivity and high selectivity for simultaneous detection of acetaminophen (ACOP) and 4-aminophenol (4-AP) was successfully constructed. The synergistic effect between TF-Py COF, 3D NCNF-T and AuNPs effectively improves the analytical sensitivity of target analytes. Under optimized experimental conditions, the electrochemical sensing platform has a sensitive volt-ampere response and a wide linear range to both ACOP and 4-AP, and the detection limits are 0.13 μM and 0.05 μM (S/N = 3), respectively. The sensor has been successfully applied to the determination of ACOP and 4-AP in acetaminophen tablets and Yellow River water samples, with high recovery rate, good selectivity and reproducibility, and strong anti-interference ability. It is expected to be widely used in the actual sample detection.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xiaoqu Wang,Jiuhui Qi,Xinji Luo,Zhongyun Yang,Youjun Fan,Zhe Jiang,Chengzhou Liu,Jun Yang,Wei Chen
Nanocatalysts with combination of unique morphologies and synergistic interactions have a potential to enhance electrocatalytic ability related to the reactions in fuel cells. Here, we show a wet-chemistry-based synthesis of dendritic Au@PtIr nanowires (NWs) with core-shell constructions regarding Te NWs as sacrificial templates for methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER). Regarding the synthesis of Au@PtIr NWs, Au NWs are firstly obtained through galvanic replacement with Te templates, followed by growth of alloy PtIr shells in subsequent seed-mediated growth. The as-synthesized core-shell Au@PtIr nanowires combine the advantage of one-dimensional (1D) dendritic feature that facilitate fast electron transport and provide more interfaces and interstices between catalytic active sites and electrolyte, with the synergistic interactions in alloy shells. Consequently, the as-prepared Au@PtIr NWs show good catalytic properties in MOR and HER in terms of higher activity, larger electrochemically active surface areas (ECSAs) and better anti-toxicity than commercial Pt/C.
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