ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Jing Wen,Lijun Zhou,Ding Jiang,Xueling Shan,Wenchang Wang,Hiroshi Shiigi,Zhidong Chen
Herein, a sensitive and selective electrochemiluminescence (ECL) aptasensor was designed using [email protected] as accelerator towards the perylene derivative (PTC-Cys)/peroxydisulfate (S 2 O 8 2− ) system for kanamycin (KAN) assay. Firstly, the PTC-Cys was prepared by covalently binding l -cysteine to 3,4,9,10-perylenete-tracarboxylic acid, which was acted as the luminophore. Then [email protected] play the part of effective catalyst to accelerate the electrochemical reduction process of S 2 O 8 2− to produce more sulfate radical anions (SO 4 •- ), thus the ECL signal of the compound was noticeably raised by 2.4 times in comparison with that in which only luminophore and S 2 O 8 2− are present, achieving signal amplification of the ECL system. In the presence of KAN, aptamer was pulled down from the sensing interface, achieving a considerable enhancement of ECL intensity in S 2 O 8 2− solution. Upon the optimal condition, our proposed strategy can quantify the concentration of KAN from 1.0 × 10 −13 to 1.0 × 10 −8 M with low limit of detection of 4.2 × 10 −14 M (S/N = 3).Besides, our proposed ECL aptasensor exhibited excellent sensitivity, stability and specificity, and could be successfully applied to detect KAN in practical samples, which proved its potential to detect other antibiotics in food security.
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 40
·14235-14243
·
IF 4.39
Qingshan Xiong,Qunling Fang,Kezhu Xu,Guanghui Liu,Min Sang,Yunqi Xu,Lingyun Hao,Shouhu Xuan
Antimicrobial materials are expected to be alternatives for antibiotics against multidrug-resistant bacteria. In this paper, non-spherical α-Fe2O3@Au/PDA core/shell nanoparticles with tunable shapes are synthesized by a one-step in situ oxidation-redox polymerization method toward near infrared light-responsive antibacterial therapy. The thickness and composition of the Au/PDA hybrid shell can be controlled by varying the concentration of HAuCl4 and the dopamine precursor. Owing to the wonderful photothermal characteristics originating from the Au/PDA shell, the spindle α-Fe2O3@Au/PDA core shell nanoparticles exhibit excellent photothermal sterilization effects against both Escherichia coli and Staphylococcus aureus at low concentrations. Meanwhile, the NIR photothermal induced bactericidal performance indicates that α-Fe2O3@Au/PDA hybrid particles with tunable non-spherical shapes possess unique controllable antibacterial effects. As a result, this finding provides a simple strategy for fabricating high performance photothermal antibacterial agents and the final products possess high potential in synergistic antimicrobial therapy.
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RENEWABLE ENERGY
·
2021
·
IF 8.001
Yanan Wei,Xin Li,Yunlei Zhang,Yongsheng Yan,Pengwei Huo,Huiqin Wang
Wide-light absorption performance and efficient carrier separation ability are the necessary conditions for excellent photocatalytic materials. In this research, g-C 3 N 4 QDs (CN QDs) and Au nano-particles (NPs) co-modified CeO 2 /Fe 3 O 4 micro-flowers (MFs) photocatalyst (CACeF) has been prepared. CO 2 photoreduction experiments showed that the composite had obviously enhanced photoreduction activity and photocatalytic stability. The yields of CO and CH 4 over it as catalyst in 4 h is about 5 and 8 times greater than that of pure CeO 2 . Photoelectrochemical tests showed that the heterojunction between CN QDs and Au NPs can greatly improve the carrier separation ability and the light-utilization efficiency of photocatalysts. Besides, the excellent electronic transmission performance of Au NPs provided a specific channel for the electron transmission, and the strong local surface plasmon resonance (LSPR) of Au NPs resulted in a lot of hot-electrons can directly take part in the CO 2 photoreduction. The synergistic effect between CN QDs and Au NPs can further enhance the photocatalytic activity of the photocatalyst. Fe 3 O 4 QDs can ensure the effective recovery and reuse of the composite without affecting the photocatalytic performance of composite. Finally, a potential photoreduction mechanism of CN QDs and Au NPs co-modified CeO 2 /Fe 3 O 4 MFs photocatalyst were discussed in total.
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RSC Advances
·
2021
·Vol. 11
·期 53
·33425-33430
·
IF 3.361
Ahmat Ali,Ruxangul Jamal,Tursun Abdiryim
In this work, we developed a thiol-functionalized poly(3,4-ethylenedioxythiophene) hollow sphere (poly(EDOT-MeSH)/Au) polymer through a simple one-pot self-assembly method using polyvinylpyrrolidone (PVP) as a soft template. The monomer was used as both a reductant and a stabilizer to decorate gold nanoparticles (Au NPs). FTIR, XRD, EDX, SEM and TEM analyses were used to characterize the composite hollow spheres. The chemical bond between S and Au was confirmed by XPS. The electrochemical performance of the composite hollow spheres was determined by cyclic voltammetry (CV) and an ampere response timing current test. The results revealed that the poly(EDOT-MeSH)/Au hollow-sphere-based electrochemical sensor possesses excellent conductivity and high redox reversibility with detection limits (S/N = 3) of 0.2, 0.02, 0.08 and 0.05 μM in the linear ranges of 0.1–650 μM, 0.05–100 μM and 0.1–600 μM for the determination of ascorbic acid (AA), dopamine (DA), uric acid (UA) and nitrate ions (NO2−), respectively. The preparation method for these composites will further the development of this type of conducting polymer/gold nano-composite material modified electrochemical sensor for biological species.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Meiting Song,Yuhang Wu,Guopeng Zheng,Chunfang Du,Yiguo Su
Z -scheme g-C 3 N 4 /Au/BiVO 4 photocatalyst has been prepared successfully by assembling gold nanoparticles on the interface of super-thin porous g-C 3 N 4 and BiVO 4 , which exhibits outstanding photocatalytic performance toward hydrogen evolution and durable stability in the absence of cocatalyst. The highest photocatalytic hydrogen production rate of g-C 3 N 4 /Au/BiVO 4 was about 410.0 μmol g −1 h −1 , which largely beyond that obtained of g-C 3 N 4 /BiVO 4 (23.3 μmol g −1 h −1 ), Au/g-C 3 N 4 (244.6 μmol g −1 h −1 ) and pristine g-C 3 N 4 (2.2 μmol g −1 h −1 ). The optimal apparent quantum efficiency was counted to be 6.8% at λ = 420 nm and 1.1% at λ = 600 nm. Moreover, the photocatalytic property of g-C 3 N 4 /Au/BiVO 4 could remain unchanged almost with 50 h in 5 cycles. The improvement of photocatalytic H 2 yield is attributed to the result of rapid separation of photogenic carriers in space and surface plasmon resonance effect of Au nanoparticles. In combination of photoelectrochemical measurement, active species capture experiment and electron paramagnetic resonance spectra, the underlying mechanism was illuminated. The pathway of charge carrier migration between semiconductor photocatalysts could be changed to Z-system through Au as an electron intermediate, which could not only benefit to maintain outstanding redox capability but also help to accelerate photo-generated carrier separation, and thus improve the photocatalytic activity .
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ACS Sensors
·
2019
·
IF 6.944
Liping Zhu,Jing Ye,Mengxia Yan,Qiuju Zhu,Shuang Wang,Jianshe Huang,Xiurong Yang
Measurement of cardiac troponin I in the blood is crucial for the early diagnosis of acute myocardial infarction. Herein, a novel and ultrasensitive electrochemiluminescence (ECL) immunosensor has been developed for determination of cardiac troponin I (cTnI) by using Au nanoclusters and hybridization chain reaction (HCR) signal amplification. In this ECL immunosensor, Au nanoclusters were dual-labeled at each end of hairpin DNA (H1 and H2) and acted as the luminophore. DNA initiator strands (T1) and secondary antibody (Ab2) were conjugated on Au nanoparticles (AuNPs) to obtain a smart probe (Ab2-AuNP-T1). In the presence of target cTnI, the sandwiched immunocomplex composed of cTnI, Ab1, and Ab2-AuNP-T1 was formed. Then the initiator strands T1 of Ab2-AuNP-T1 opened the hairpin DNA structures and triggered a cascade of hybridization events. Consequently, a large number of Au NCs were indirectly modified on the surface of the electrode, which could react with the coreactant (K2S2O8) and emit a strong ECL signal. Under the optimal conditions, the immunosensor exhibited a wide detection range for cTnI from 5 fg/mL to 50 ng/mL and a low detection limit of 1.01 fg/mL (S/N = 3). Because of the excellent specificity, stability, and reproducibility of the proposed ECL-HCR sensor, it has a great application prospect for cTnI detection in clinical diagnosis.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2019
·Vol. 50
·期 6
·809-817
·
IF 2.809
Miao Qin,Pan Li,Xia Zhou,Jun Zhu,Hongyan Wang,Liangbao Yang
Although surface-enhanced Raman spectroscopy (SERS) has recently emerged as a powerful analytical tool, its widespread use is hindered by several inherent problems (e.g., low reproducibility) that need to be solved before further progress is possible. Herein, we used dodecyltrimethylammonium bromide (DTAB), N -dodecyl- N -2-hydroxyethyl- N , N -dimethylammonium bromide (C 12 HDAB), and N -dodecyl- N , N -2-dihydroxyethyl- N -methylammonium bromide (C 12 DHAB) as templates for the seed-mediated growth of Au nanorods with different aspect ratios and probed the growth mechanism by a range of instrumental techniques. The prepared nanorods were used as substrates for SERS-based detection of three negatively charged colorants (lemon yellow, orange II, and amaranth) and exhibited extraordinary SERS sensitivity for all of these targets. The highest sensitivity was observed in the case of C 12 DHAB-capped nanorods, which was attributed to abundant hydrogen bonds between surfactants and targets and strong electrostatic adsorption of negatively charged colorants. Therefore, the above substrate was concluded to be well suited for real-life applications.
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FOOD CONTROL
·
2019
·
IF 4.248
Baoshan He,Dandan Yan
In this work, an electrode which comprises Au nanoparticles (AuNPs) and electrochemically reduced graphene oxide (ERGO) recombined Cu based metal-organic framework (Cu-TDPAT) was prepared for nitrite detection. The structure and constituent of the modified material were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and FT-IR. The electrochemical behavior of nitrite at the modified electrode was performed by cyclic voltammetry and electrochemical impedance spectroscopy. The results indicated that the oxidation process of nitrite happened at recommended electrode had a superior response. The proposed electrode showed high electrocatalytic capacity toward nitrite oxidation with a wide linear working range (0.001–1000 μmol·L −1 ) and a detection limit of 0.006 μmol·L −1 . Finally, the sensor was successfully applied to detect nitrite in real sample and achieved desirable recovery rate, showing its potential application in real-time detection of food .
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Sui Mao,Jiliang Liu,Yuyong Pan,Jihoon Lee,Zhao Yao,Puran Pandey,Sundar Kunwar,Zhijun Zhu,Wenfei Shen,Laurence A. Belfiore,Jianguo Tang
Hybrid metal-oxide (MO)/metal nanostructures (MNSs) have been appealing in widespread optoelectronic devices due to their strong and tunable plasmonic activity encompassing selective scattering and absorption of wavelength depending upon the surface morphology and surrounding dielectric environment. In this paper, the various MO/Au NSs hybrid thin-films are fabricated via the solid-state-dewetting growth of Au NSs and sol-gel deposition of MO top-layers including ZrO x , CeO x , YO x and AlO x . Over 450% enhancements in maximum absorption are observed along with the peak redshift of 168 nm for the series of MO/Au NS films. The overall plasmonic properties undergo three regimes by the systematical control of film morphology: (I) Rapid enhancement, (II) Slow enhancement and (III) Decay. The optical evolution is correspondingly investigated with the assistant of finite-different time-domain (FDTD) calculation. This work may give an aid to the photo-electronic applications, such as photovoltaics , sensing and surface enhanced Raman scattering , based on hybrid MNSs especially on control of their plasmonic properties.
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BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Hui-Fang Cui,Ting-Ting Zhang,Qi-Yan Lv,Xiaojie Song,Xiao-Jing Zhai,Gai-Gai Wang
A stable and sensitive electrochemical acetylcholinesterase (AChE) biosensor for detection of organophosphorus pesticides (OPs) was developed by doping Au nanorods (AuNRs)@mesoporous SiO 2 (MS) core-shell nanoparticles into CS/TiO 2 -CS (CS denotes for chitosan) immobilization matrix. AuNRs@MS core-shell nanoparticles were synthesized and characterized. The doping and the biosensor fabrication process were probed and confirmed by scanning electron microscopy and electrochemistry techniques. The doping conditions were optimized. The matrix both before and after AChE immobilization had a mesoporous nanostructure . The nanoparticles dispersed homogeneously within the matrix. The doping significantly enhanced the electro-conductivity of the TiO 2 -CS hydrogel, and dramatically improved the bioelectrocatalytic activity and OPs detection sensitivity of the AChE immobilized matrix. The detection linear ranges for both dichlovos (DDVP) and fenthion were from 0.018 μM (4.0 ppb) to 13.6 μM, and the limit of detection (LOD) was 5.3 nM (1.2 ppb) and 1.3 nM (0.36 ppb), respectively. The biosensor exhibited high reproducibility and accuracy in detecting OPs spiked vegetable juice samples. In addition, it exhibited very high detection stability and storage stability. The developed AChE biosensor was provided to be a promisingly applicable tool for OPs detection with high reliability, simplicity, and rapidness.
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Analytical Methods
·
2019
·Vol. 11
·期 30
·3837-3843
·
IF 2.378
Lili Xu,Hongbo Suo,Jianling Wang,Feixiang Cheng,Houmei Liu,Hongdeng Qiu
A novel magnetic graphene oxide modified with Au nanoparticles (Fe3O4@CS/GO/Au) as an efficient adsorbent was prepared for the detection of rhodamine B (RB) coupled with fluorescence spectrophotometry. The as-prepared Fe3O4@CS/GO/Au was characterized by using a field emission scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS), and vibrating sample magnetometer (VSM). The main parameters, which affect extraction and desorption efficiencies, were systematically investigated and optimized. Under the optimal conditions, good linearities (0.1–6.0 μg L−1) with R2 = 0.9990, LODs (0.03 μg L−1) and LOQs (0.1 μg L−1) were achieved. Compared with chitosan-coated magnetic nanoparticles (Fe3O4@CS) and graphene oxide-modified Fe3O4@CS (Fe3O4@CS/GO), Fe3O4@CS/GO/Au exhibited optimal extraction efficiency. To demonstrate the application potency of Fe3O4@CS/GO/Au, it was successfully applied to isolate and extract RB from tap water, waste water, soft drink and eye shadow and the spiked recoveries were between 94.51% and 101.24% with RSD values from 1.95% to 6.15%. It was confirmed this novel method was an efficient pretreatment and enrichment procedure and could be successfully applied for the extraction and determination of trace RB in complex matrices.
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TALANTA
·
2019
·
IF 4.916
Linlin Xu,Hua Zhang,Yue Tian,Anxin Jiao,Shuang Li,Yang Tan,Ming Chen,Feng Chen
The integration of highly-purity, dense and monodisperse plasmonic nanoparticles (NPs) on two-dimensional (2D) graphene-like support possesses great potential for optimizing surface-enhanced Raman spectroscopy (SERS). Based on ultraviolet (UV) laser-induced modified photochemical reaction , we report an ingenious and green strategy to support highly dispersed Au NPs with controllable distribution on graphene oxide (GO). Without using any stabilizing agents or other complex chemical additives , the GO with abundant oxygen-containing functional groups can be effectively excited by 375 nm laser irradiation in HAuCl 4 solution, resulting in controlled reduction of Au ions and then overgrowth of highly-purity Au NPs. Highly dense and monodisperse Au NPs with uniform diameter of ~20 nm formed on GO supports can be achieved by 30 min irradiation, which can offer maximized SERS activity in comparison with GO/Au NPs obtained by other irradiation times. The optimized GO/Au NPs give rise to ultralow SERS analyses of (10 −14 M) methylene blue (MB), (10 −13 M) rhodamine 6G (R6G) and (10 −13 M) malachite green (MG), respectively. More importantly, it can also simultaneously analyze these three aromatic dyes in a mixture condition at detection limits as low as nano-mole level (10 −9 –10 −11 M), achieving the urgent requirement of mutually independent SERS trace detection. Therefore, the obtained GO/Au NPs with extremely high SERS activity and superior spectroscopic identification will be a prominent candidate for widespread SERS applications in real-word scenarios.
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