APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Wei Zhang,Zhengfang Liao,Xiaoqi Meng,A Erpuding Ai Niwaer,Hongyue Wang,Xinhua Li,Deming Liu,Fang Zuo
In this work, hydrophobic upconversion nanoparticles (UCNPs) were transformed into hydrophilic NPs via the rapid oxidative polymerization of dopamine (DA) induced by NaIO 4 in a water-in-oil microemulsion system. The polydopamine (PDA)-coated UCNPs synthesized using NaIO 4 as the oxidant exhibited a positive charge (+26.4 mV) at pH 7.0. Those prepared using ambient O 2 as the oxidant had a negative charge (–15.4 mV). The difference in the composition between PDA-coated UCNPs using NaIO 4 (UCNPs@PDA-NaIO 4 ) and those using ambient O 2 (UCNPs@PDA-O 2 ) as oxidants was supported by the XPS and FTIR results. The difference in the surface charges may be due to variation in the composition, which probably attributed to the different oxidants used. A series of controlled experiments were carried out to infer the origination of the positive charges of UCNPs@PDA-NaIO 4 . Furthermore, Au nanoparticles (Au NPs) were deposited on UCNPs@PDA-NaIO 4 where PDA served as both the reductant and the stabilizer so that additional reagents and thermal treatments were not necessary. The effect of pH on the deposition of Au NPs was also studied. In addition, the load density of Au NPs on the surface of the PDA-coated UCNPs could be adjusted by changing the dosage of HAuCl 4 , which could effectively enhance the upconversion luminescence (UCL) intensity. This work provides a method to regulate the surface charge of the PDA coating, and the nanocomposites with unique properties synthesized by this method may be employed in biological imaging, diagnostic analysis, and other biological fields.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 2
·027547
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IF 3.721
Shuan Zhang,Yueyun Li,Chunyan Zhang,Yilei Jia,Ping Wang,Yunhui Dong,Xinjin Li,Qing Liu,Zengdian Zhao
Herein, urchin-like gold@platinum dendritic nanoparticles supported on molybdenum selenide@molybdenum disulfide (Au@Pt DNPs/MoSe2@MoS2) nanocomposite with multiple signal amplification capabilities was successfully synthesized as the matrix platform of label-free amperometric immunosensor for the quantitative detection of squamous cell carcinoma antigen (SCCA). Au@Pt DNPs/MoSe2@MoS2 consists of Au@Pt DNPs with splendid biocompatibility as well as catalysis and MoSe2@MoS2 with reformative peroxidase activity, which owned enhanced electrocatalysis toward hydrogen peroxide reduction and steady bioconjugation for bioprotein immobilization. Additionally, Au@Pt DNPs/MoSe2@MoS2 possessed satisfactory conductivity to accelerate electron transfer at the electrode interface. With the help of Au@Pt DNPs/MoSe2@MoS2, the immunosensor procured a good linear extent of SCCA detection between 100 fg ml−1 and 100 ng ml−1, reached a lower detection limit than previous reports. Moreover, the immunosensor with good stability and reproducibility achieved the specific detection of SCCA in the mixture containing interferents as well as in the real human serum sample, which testified to the proposed amperometric immunosensor was reliable in clinical detection of tumor biomarkers.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-8
·
IF 6.232
Li Shuhuai,Pang Chaohai,Ma Xionghui,Zhao Min,Li Haibo,Wang Mingyue,Li Jianping,Luo Jinhui
A luminescent double recognition nanoprobe is described as a new strategy for the selective determination of chiral molecules. C-dots/Ir/Au fluorescent nanoparticles, synthesised under hydrothermal conditions, are used as a high-performance probe in combination with a molecularly imprinted polymer (MIP) and calix[6]arene as a double recognition element. Thiolated calix[6]arene is grafted on C-dots/Ir/Au as the first recognition element, which then forms a host–guest complex with the target molecule levodopa (L-DOPA). Subsequently, an MIP is prepared on the C-dots/Ir/Au (MIP/C-dots/Ir/Au) by chemical polymerisation. After the removal of L-DOPA, double recognition imprinting cavities are formed. The fluorescence intensity at 478 nm of the nanoprobe is effectively quenched by adsorption of L-DOPA on MIP/C-dots/Ir/Au, which provides a method for L-DOPA determination. Owing to the double recognition strategy, this method has excellent selectivity which can effectively avoid interference from enantiomer D-DOPA, and a imprinting factor of 7.1 is obtained for L-DOPA. This accurate and reliable method, with a wide linear range (5 × 10 −10 to 1.2 × 10 −7 mol L −1 ) and a low limit of detection (1.45 × 10 −10 mol L −1 ), was successfully applied to the determination of L-DOPA in real samples, giving standard recoveries of 89.7–110.0%. Thus, the proposed sensing method provides a viable approach for the determination of a single enantiomer.
Schematic presentation of the MIP/C-dots/Ir/Au for L-DOPA detection. A fluorescence double chiral recognition nanoprobe is prepared of C-dots/Ir/Au nanoparticles as signal probe, and a molecularly imprinted polymer (MIP) and calix[6]arene as a double recognition element. Owing to the double recognition strategy, this method has strong specificity and can effectively avoid interference from enantiomers and racemates.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yi Xu,Md Mehedi Hassan,Afang Zhu,Huanhuan Li,Quansheng Chen
A new dual-mode optical-nano-sensor was designed to effectively isolate, discriminate and inactivate multiple foodborne pathogens through the combined effort of magnetic SERS tags and functionalized upconversion nanoparticles. The positively charged quaternary ammonium salt (QAS) functionalized upconversion nanoparticles (UCNPs@QAS) were used as a fluorescent probe for the analysis of total bacteria count and inactivation of bacteria, and 4-mercaptophenylboronic acid (4-MPBA) modified magnetic Au@Ag NPs (MAu@Ag@MPBA) were applied as a SERS tag for isolation and classification of bacteria. Various types of bacteria can be captured by UCNPs@QAS through electrostatic interactions and by MAu@Ag@MPBA via the reversible recognition interaction of a boronic acid group of 4-MPBA and peptidoglycan from bacteria simultaneously. And then the formed complex structural assemblies were isolated rapidly from the sample matrix by employing the magnetic force for fast and simple dual-model optical detection. In addition, the novel biosensor was successfully applied to discriminate and detect Escherichia coli , Salmonella , Staphylococcus aureus, and their mixture in contaminated milk with the classification rate of 97.2–100 %. The proposed multi-functional nano-platform was able to sensitively capture, detect, and kill foodborne pathogens in a complex system, which could be deployed successfully towards the monitoring of food safety.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 39
·13876-13885
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IF 7.393
Nurbiye Sawut,Ruxangul Jamal,Tursun Abdiryim,Aygul kadir,Ruanye Zhang,Zulpikar Helil,Mariyam Niyaz
As the void space can increase the effective surface area and the mesoporous shell ensures the fast transmission of electrons and ions, the yolk–shell-structured carbon spheres (YRFC) have been explored as electrode modification materials. Various hybrid nanocomposites of YRFC were studied for expanding their applications. In this work, a thiol-grafted poly(3,4-ethylenedioxythiophene)/resorcinol-formaldehyde yolk–shell carbon nanosphere/Au composite (PEDOTMeSH/YRFC/Au) was fabricated and used as the electrode material for the simultaneous electrochemical detection of caffeic acid (CA) and levofloxacin (LVF). The structure and morphology of the composite were investigated by UV-Vis and FTIR spectroscopy, XRD, XPS, SEM, TEM, EDS, and elemental mapping. The electrochemical performance of PEDOTMeSH/YRFC/Au was evaluated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV), and the results were compared with those of YRFC/Au and PEDOT/YRFC/Au composites. The structural analysis revealed that PEDOTMeSH/YRFC/Au had a higher conjugation degree than the other composites. The morphological analysis indicated that the surface of YRFC was uniformly coated by PEDOTMeSH with well-dispersed Au NPs. The results of electrochemical studies showed that the limits of detection of the PEDOTMeSH/YRFC/Au composite electrodes were 0.014 μM and 0.018 μM, respectively, and the linear detection range was 0.02–320 μM for both CA and LVF.
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TALANTA
·
2019
·
IF 4.916
Yuanjie Teng,Zeyu Ren,Yuchao Zhang,Zhenni Wang,Zaifa Pan,Kang Shao,Yuanbin She
As the concentration of Zn 2+ in patients with prostate cancer is much less than that in healthy persons, Zn 2+ concentration can be used as a marker to expediently screen prostate cancer. In this study, a sensitive and highly selective surface-enhanced Raman scattering (SERS) method to detect Zn 2+ concentration in human prostatic fluids by utilizing water-insoluble 2-carboxyl-2′-hydroxyl-5′-sulfoformazylbenze (Zincon) as a SERS probe based on self-assembled Au nanoarrays at a liquid–liquid interface between n-hexane and Au colloids was proposed. Zincon showed remarkably different SERS bands before and after coordinating Zn 2+ in the controlled conditions (70 μL of ethanol, 500 μL of n-hexane, pH value of 7.1 and 10 s of vortex mixing time), which can be used in quantifying Zn 2+ with characteristic peaks. The proposed SERS method presented a good linear relationship ranging from 0.5 to 10 μmol/L and a satisfactory detection limit of 0.1 μmol/L as well as low interference with other metal ions . Moreover, the detection results are close to those of the conventional standard atomic absorption spectroscopy (AAS) method.
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TALANTA
·
2019
·
IF 4.916
Shengrui Xu,Qingqing Liu,Cuicui Wang,Li Xiao,Suling Feng,Ning Li,Chang-Po Chen
In this study, facile fabrication of three-dimensional (3D) pompon-like gold/zinc oxide (Au/ZnO) porous microspheres by hydrothermal procedure was investigated. These microspheres were utilized as solid phase microextraction (SPME) coating for determination of volatile fatty acids (VFAs) from foot odor coupling with gas chromatography-mass spectrometry (GC-MS). SEM and TEM characterizations showed that as-prepared material was composed of 1D porous nanowires and presented a uniform coating on stainless-steel wire. The extraction of VFAs including propanoic acid, butyric acid , isobutanoic acid, isovaleric acid , hexanoic acid , and heptylic acid was carried out by headspace model after sampling from human foot using cotton wool strips. Following optimization of extraction parameters including extraction temperature and time and desorption temperature and time, the as-prepared SPME coating presented better extraction efficiency than commercial DVB/CAR/PDMS fiber towards all the VFAs due to its excellent properties. Under the optimized conditions, the method exhibited good linearity (0.5–200 ng) with regression coefficients (R 2 ) ranging from 0.9836 to 0.9981 for all the analytes. The limits of detection ranged from 0.017 to 0.098 ng. Single fiber repeatability varied from 6.5% to 11.2% and the fiber-to-fiber reproducibility ranged from 8.6% to 12.3%. The proposed method was successfully applied for extraction and determination of VFAs from foot odor after sampling using cotton wool strips.
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Analytical Methods
·
2019
·Vol. 12
·期 1
·104-111
·
IF 2.378
Jianmin Wang,Wei Yang,Qiling Peng,Daobin Han,Liangsheng Kong,Lu Fan,Min Zhao,Shijia Ding
Rapid and simple detection of carbapenem-resistant Enterobacteriaceae (CRE) is important to manage infection and prevent the spread of these bacteria. In this work, we utilize pH response to detect CRE in urine rapidly. By using vancomycin-modified Fe3O4@Au nanoparticles (Fe3O4@Au@VanNPs), CRE in urine were enriched and separated efficiently via vancomycin–cell wall interaction. More importantly, carbapenemases released via CRE lysis were detected using a pH metre which responded to hydrogen ions generated from imipenem hydrolysis. Thus, the concentration of CRE in urine was detected via the carbapenemase hydrolysis reaction. The proposed method demonstrated a good linear relationship in the range of 104–108 cfu mL−1 for CRE with the limit of detection estimated to be 1.0 × 103 cfu mL−1. More importantly, this method successfully detected clinically isolated CRE strains in urine samples within 3.5 h. Thus, this biosensing strategy might have the potential for practical application in the rapid detection of various resistant bacteria.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hui Li,Shushu Chu,Qian Ma,Yuan Fang,Junpeng Wang,Quande Che,Gang Wang,Ping Yang
Morphology-tunable C–N/SnO2-based hierarchical microspheres with good gas sensitivity for triethylamine (TEA) have been fabricated via facile electrospinning and a subsequent calcination process. The reaction temperature and modifying calcining technology played a dominant role for the morphological evolution from precursor fibers to microspherical shapes and the formation of C–N-decorated SnO2 phase composition. C–N/SnO2/ZnO composites with tunable crystallinity, microstructure, and gas-sensing performance were strictly dependent on the added amount of Zn element. Fascinatingly, the constructed C–N/SnO2/ZnO/Au composites can not only precisely regulate the crystal size, dispersion status, loading position, and content of Au nanoparticles but also display excellent gas-sensing properties with ultrasensitivity and high selectivity under various temperature detections. The response of C–N/SnO2/ZnO/Au composites can reach up to approximately 1970, calculated to be 121.6 and 23.6 times for 50 ppm TEA molecules at optimal conditions compared with C–N/SnO2 and C–N/SnO2/ZnO microspheres, respectively, actually representing the highest response value at high temperatures reported to date. The superior long-aging stability of sensing behaviors and phase structures can be also observed after 1 month. More importantly, novel C–N/SnO2/ZnO/Au sensors were employed for availably detecting low-concentration volatiles released from the storage procedure of fishes at 80 °C, indicating the practical application in chemical detectors and biosensors at low temperature. The novel gas-sensing mechanisms derived primarily from the combination of phase compositions, morphologies, and unique surface/interface transfer processes of C–N/SnO2/ZnO/Au composites are presented and investigated in detail, which will contribute to the design and development of other semiconductor-based composite sensors.
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Environmental Science-Nano
·
2019
·Vol. 6
·期 3
·948-958
·
IF 7.704
Weiping Zhang,Guiying Li,Hongli Liu,Jiangyao Chen,Shengtao Ma,Taicheng An
A facile micro/nano-bubble method was firstly applied to synthesize an Au/TiO2@CNT composite photocatalyst for photocatalytic degradation of gaseous styrene. The morphologies, structures and compositions of the photocatalysts were investigated by using a series of analytical techniques (scanning and transmission electron microscopy, FT-IR spectroscopy, Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy). The micro/nano-bubbles can effectively facilitate the reaction of Au and TiO2 NPs decorated onto CNTs, forming a stable ternary composite structure. The photocatalytic performance of Au/TiO2@CNTs was investigated by the methodology of central composite design (CCD) in response surface methodology (RSM). The photocatalytic degradation and mineralization of styrene over Au/TiO2@CNTs drastically increased with the rise of reaction temperature due to the formation of a compact structure. The analysis of EPR, UV-vis DRS, electrochemical properties and TPD-O2 further revealed the enhanced photocatalytic mechanism of Au/TiO2@CNTs. The further identification of free radicals showed that the photocatalytic degradation and mineralization of styrene were closely related to oxidative radicals such as hydroxyl radicals and superoxide radicals, which were mainly attributed to the synergistic effects of Au NPs and CNTs to enhance the photocatalytic activity. This work will provide a new insight into designing photocatalysts with high photocatalytic performance and stability for the degradation of hazardous VOCs.
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PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2019
·
IF 3.176
Wen Cui,Xiaoli Kang,Xiaoying Zhang,Zhou Zheng,Xudong Cui
Recently, Metal-organic framework (MOF) has attracted general attention as self-sacrificial template to produce metal oxide semiconductor (MOS) for gas sensing. In this work, we fabricated a porous cubic microstructure of Co 3 O 4 through the facile pyrolysis of ZIF-67. The obtained Co 3 O 4 sustained a similar cubic morphology with ZIF-67 template, but much improved pore structure was achieved. Moreover, we attempted to modify the Co 3 O 4 with Au nanoparticles . Through a facile post-synthesis adsorption & pyrolysis, the Au nanoparticles with an average size of 15–20 nm were evenly dispersed on the surface of Co 3 O 4 . Then the obtained samples were investigated for acetone gas-sensing. Results showed that both Co 3 O 4 and its Au doped structure could be used for acetone detection, while due to the existence of metal-semiconductor heterojunction and the catalysis and spillover functions of Au nanoparticles, the prepared Au/Co 3 O 4 composite showed much improved acetone response and much shortened response-recovery time than that of the bare Co 3 O 4 structure.
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Nano Research
·
2019
·Vol. 12
·期 6
·1375-1379
·
IF 8.515
Xu Meng,Tu Guopeng,Ji Muwei,Wan Xiaodong,Liu Jiajia,Liu Jia,Rong Hongpan,Yang Yanlian,Wang Chen,Zhang Jiatao
Utilizing vacuum-tuned-atmosphere induced dip coating method, we achieve the cross-dimensional macroscopic diverse self-assemblies by using one building block with one chemical functionality. Coordinated modulating the vacuum degree, colloid concentration and evaporation atmosphere, Au@Ag core/shell NCs can controllably assemble into diverse multi-dimensional superstructures. Under 0.08 MPa, we obtained the two-dimensional (2D) stepped superstructures with continuously tunable step width. In addition, we generated a series of tailorable nanoscale-roughened 2D Au@Ag NCs superstructures at 0.04 MPa, which exhibited the label-free ultrasensitive SERS detection for the different mutants of IAPP8-37 proteins. Under 0.01 MPa, we obtained the cross-dimensional tailorable Au@Ag NCs assemblies from random to macroscale 2D and three-dimensional (3D) densest superstructures by adjusting the capping ligand-environmental molecule interactions. This is a flexible method to generate as-prepared Au@Ag core/shell NCs into well-defined macroscopic diverse superstructures and to promote the exploitation into biological applications.
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