SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Kaiqiang Wang,Jinjie Li
The fabrication of sensitive and reliable interfacial plasmonic platform for measuring chemical contaminants in various phases is an exciting topic in the food industry and for environment monitoring. In this study, a high-performance surface-enhanced Raman spectroscopy (SERS) analytic platform was developed through self-assembly of the gold@4-mercaptobenzoic acid@silver nanoparticles (Au@4-MBA@Ag NPs) at the cyclohexane/water interface. By addition of the inducer ethanol, the Au@4-MBA@Ag NPs in aqueous phase was effectively migrated to the biphasic interface, forming a large-scale close-packed nanoparticle array. The average gap between adjacent nanoparticles was smaller than 3 nm, where intensive SERS “hot spots” were created for high-sensitive detection. Furthermore, using the sandwiched 4-MBA molecule as the internal standard to correct the Raman signal fluctuations, the point-to-point and batch-to-batch reproducibility of Au@4-MBA@Ag array were improved with lower relative standard deviation (RSD) values of 8.84% and 14.97%, respectively, and pesticides (thiram and thiabendazole) analysis in both aqueous and organic phases were achieved with higher accuracy (R 2 of 0.986 and 0.990) as compared with those without 4-MBA correction (R 2 of 0.867 and 0.974). The high-throughput fabrication of the self-assembled nanoparticle array is a promising approach for development of a sensitive and reliable SERS platform for chemical contaminants monitoring in multiphase.
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Journal of Physical Chemistry C
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2021
·
IF 4.126
Chen Ding,Zijie Mao,Jia-Shun Liang,Xianxian Qin,Qing Zhang,Fan Yang,Qing Li,Wen-Bin Cai
The commercialization of proton exchange membrane fuel cells (PEMFCs) calls for the development of active and durable Pt-based catalysts for oxygen reduction reaction (ORR) by means of a cost-effective and environmentally benign protocol. We report herein an all aqueous phase preparation of carbon supported Au-modified Pt–Co alloy catalyst (Au/Pt–Co/C), which involves the dimethylamine borane co-reduction of aqueous Pt(II) and Co(II) precursors to form a Pt–Co/C catalyst and the ethanol reduction of an aqueous Au(III) precursor to form Au/Pt–Co/C. This Au/Pt–Co/C catalyst not only shows a greatly enhanced ORR activity like the homemade Pt–Co/C and state-of-art Pt–Co/C(com) catalysts as compared to the Pt/C catalyst but also exhibits a much higher durability over the Pt/C(com), homemade Pt–Co/C, and state-of-art Pt–Co/C(com) catalysts in accelerated degradation tests (ADTs) with both half-cell and single-cell configurations. Specifically, the maximum power density of a PEMFC involving the Au/Pt–Co/C cathode suffers only a 6% loss after 30 000 cycles of a standard ADT while that involving the state-of-art Pt–Co/C(com) suffers a 37% loss. This research provides an alternative route to prepare efficient and durable Pt-based ORR catalysts toward a widespread application of PEMFCs.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Ning Sui,Tao Wang,Qiang Bai,Ruiping Yue,Haoran Jiang,Hailian Xiao,Manhong Liu,Lina Wang,Zhiling Zhu,William W. Yu
We report a facile synthesis of ternary Au@PdNi core-shell nanoparticles (C-SNPs). Au NPs with 15 nm in diameter served as seeds, Pd 2+ and Ni 2+ were co-reduced on the surface of Au NPs to obtain C-SNPs. These C-SNPs exhibited outstanding catalytic performance (5891 mA mg Pd −1 ) and stability for ethanol oxidation reaction (EOR). The activity was 9.48 times higher than the commercial Pd/C (20% wt). The catalytic mechanism was investigated, and the enhanced catalytic performance of Au@PdNi C-SNPs was mainly attributed to electronic effects between Pd and Au/Ni, and the unique core-shell nanostructure . The present work provides a strategy for rational design of ternary metallic core-shell nanocatalysts, which can achieve high catalytic activity and durability.
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ChemistrySelect
·
2019
·Vol. 4
·期 43
·12479-12490
·
IF 1.716
Guoming Zhao,Enyuan Gao,Qiaoqiao Wan,Qing Liu,Junjie Liang,Yingyun Qiao,Guangzhen Zhao,Yuanyu Tian
Graphical The efficient aerobic oxidative esterification reaction of 1,3-propanediol and methanol to form methyl 3-hydroxypropionate in the presence of 1.5 wt. % Au/Al 2 O 3 catalysts prepared using the deposition-precipitation or colloid-deposition method were investigated. Preparation methods and calcination temperature of catalyst played important role in improving the catalytic activity in this work. 1.5 wt. % Au/Al 2 O 3 catalysts were prepared using the deposition-precipitation or colloid-deposition method and calcined at different temperatures for the selective oxidative esterification reaction of 1,3-propanediol and methanol to form methyl 3-hydroxypropionate (3-HPM). The catalysts were characterized by nitrogen adsorption, transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy, X-ray photoelectron spectra (XPS), CO 2 temperature-programmed desorption (CO 2 -TPD) and NH 3 temperature-programmed desorption (NH 3 -TPD). The effect of the calcination temperature of the catalyst prepared by the deposition-precipitation method on the catalytic performance for the selective oxidative esterification of 1,3-propanediol was studied. The results showed that the conversion of 1,3-propanediol and the selectivity of 3-HPM increased at first and then decreased with the increase of the calcination temperature of catalyst. The highest conversion of 1,3-propanediol and selectivity of 3-HPM at the optimal calcination temperature of 350 °C were 92.0% and 88.5%, respectively. Considering the effects of preparation method and calcination temperature, it could be concluded that the metallic Au nanoparticles with appropriate particle size in coordination with the suitable amount of weak and middle acid and base sites, were favorable to the oxidative esterification of 1,3-propanediol and methanol to 3-HPM. Moreover, we found that the 1.5 wt. % Au/Al 2 O 3 catalyst could be effectively recovered without obvious decline of the catalytic properties.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Fenglei Liu,Guilong Peng,Tong Li,Gang Yu,Shubo Deng
A novel bio-adsorbent (DACS-TA) was synthesized via a facile crosslinking reaction between tannin acid (TA) and dialdehyde corn starch (DACS), and the adsorption behavior of Au(III) from aqueous solution onto the DACS-TA was evaluated in batch adsorption experiments. Fourier Transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies were used to verify the successful crosslinking reaction, and the surface functional groups and the thermal stability of the prepared DACS-TA were also characterized. Adsorption results showed that the DACS-TA exhibited high adsorption capacity and selectivity towards Au(III), and the maximum adsorption capacity could reach up to 298.5 mg/g at pH 2.0 according to the Langmuir fitting. The adsorption isotherms of Au(III) on the DACS-TA were described well by the Langmuir model, indicating that the monolayer adsorption of Au(III) possibly occurred on the adsorbent surfaces. The kinetic data were fitted better by the Pseudo-second-order kinetic equation in comparison with the Pseudo-first-order and Intraparticle diffusion equations. Based on the SEM, XRD and XPS analysis, the adsorption-reduction mechanism of Au(III) on the DACS-TA was proposed. Namely, Au(III) was first adsorbed on the adsorbent and then was reduced to Au(0) while the phenolic group of TA was oxidized to carbonyl groups.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yunyang Wang,Changzhu Yang,Ayan Chen,Wenhong Pu,Jianyu Gong
Core-shell and yolk-shell Au@TiO 2 NPs were successfully synthesized, and the morphology differences were observed. Its photocatalytic activity was evaluated by photocatalytic oxidation of gaseous toluene under visible light illumination. The results indicated that yolk-shell Au@TiO 2 exhibited superior photocatalytic properties and demonstrated a good stability. Almost 57.3% of gaseous toluene was removed over 0.14 at% yolk-shell Au@TiO 2 in 3 h. It could also be reused for several times without corrosion. Furthermore, the comprehensive effect of LSPR response of Au, high cavity volume of yolk-shell structure, larger specific surface area, more mesoporous and the existence of Ti 3+ were all benefit for the photocatalytic process. ESR tests also confirmed that h + , OH, O 2 − and Ti 3+ generated from yolk-shell Au@TiO 2 were the main active species in the photocatalytic degradation progress of gaseous toluene under visible light irradiation.
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NANOTECHNOLOGY
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2019
·Vol. 30
·期 28
·285502
·
IF 3.399
Fen-Ying Kong,Rong-Fang Li,Lei Yao,Zhong-Xia Wang,Heng-Ye Li,Wen-Juan Wang,Wei Wang
In this paper, a novel electrochemical sensor based on Au nanoparticles/8-aminoquinoline functionalized graphene oxide (AuNPs/GAQ) nanocomposite was developed and tested for the first time for detection of paraquat (PQ). The morphology and composition of AuNPs/GAQ nanocomposite were characterized by various techniques, including transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy. Cyclic voltammetry and differential pulse voltammetry were utilized to investigate the electrochemical performances of AuNPs/GAQ nanocomposite modified glassy carbon electrode. The obtained modified electrode exhibited excellent electrocatalytic activity towards detection of PQ. Under the optimized conditions, the proposed sensor showed low detection limit (6 nM, S/N = 3), wide linear range (0.02–24 μM), high selectivity and good stability. In addition, it was successfully applied for detection of PQ in natural water samples with satisfactory results.
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BIOSENSORS & BIOELECTRONICS
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2019
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IF 9.518
Di Huang,Lu Wang,Yi Zhan,Lina Zou,Baoxian Ye
A novel signal on-off type photoelectrochemical (PEC) biosensing system was designed for sensitive detection of carcinoembryonic antigen (CEA) based on tin disulfide nanosheets loaded on reduced graphene cxide (SnS 2 -GR) as the photoactive material and gold nanoparticles coated on reduced graphene oxide-functionalized copper sulfide ( [email protected] ) for signal amplification . It's the first time for SnS 2 -GR was exploited as a sensing matrix. Here, the photocurrent signals of SnS 2 were amplified attributed to the sensitization effect of graphene. As signal amplifier, [email protected] could quench the photocurrents of SnS 2 -GR not only through the p-n type semiconductor quenching effect as well as the steric hindrance effect, but also as peroxidase mimetics to catalyze the oxidation of 4-Chloro-1-naphthol (4-CN) to produce insoluble product on the electrode surface . Based on the multiple signal amplification ability of [email protected] , CEA was detected sensitively with a linear range from 0.1 pg mL −1 to 10 ng mL −1 and limit of detection down to 59.9 fg mL −1 (S/N = 3). Meanwhile, the PEC biosensor displayed excellent performance in the assay of human serum sample, showing good application prospects for various target analysis.
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Materials Express
·
2019
·Vol. 9
·期 4
·319-327
·
IF 1.465
Zhen Deshuai,Zhong Fenfen,Yang De,Cai Qingyun,Liu Yu
A novel photoelectrode of ternary CdS/Au/TiO2 nanotube array, fabricated by electrodeposition technique and successive ionic layer adsorption and reaction (SILAR) method, shows strong photon absorption capacity and active charge transfer efficiency. A photoelectrochemical
aptasensor was developed to detect cytochrome c (cyt c) by decorating a HS-aptamer on the CdS/Au/TiO2 photoelectrode. Due to the specific binding between the cyt c and aptamer, the cyt c-aptamer complex formed and enhanced the steric hindrances and reduced the e/h
+
lifetimes, which result in a decrease in the photoelectrical current intensity. Cyt c is, therefore, also quantified based on the decrease in photoelectrical current. The developed aptasensor shows a high specificity and a high sensitivity towards to the cyt c, giving a linear range from 5
pM to 100 nM, and a limit of detection of 3.45 pM.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
·
IF 2.88
Jian Zhu,Zai-jie Xu,Guo-jun Weng,Jing Zhao,Jian-jun Li,Jun-wu Zhao
In this report, Ag-dielectric-Au three-layered nanoshells with controlled inner core size were synthesized. The fluorescence emission of the rhodamine 6G (R6G) could be quenched by the three-layered nanoshells distinctly. What's more, the fluorescence quenching efficiency could be further improved by tuning the etching of inner Ag nanosphere . The maximum fluorescence quenching efficiency is obtained when the separate layer just appears between the inner Ag core and the outer Au shell. Whereas the fluorescence quenching efficiency is weakened when no gaps take place around the inner Ag core or the separate layer is too thick and greater than 13 nm. The fluorescence quenching properties of the Ag-dielectric-Au three-layered nanoshells with different initial sizes of the Ag nanoparticles are also studied. The maximum fluorescence quenching efficiency is obtained when the three-layered nanoshells are synthesized based on the Ag nanoparticles with 60 nm, which is better than others two sizes (42 and 79 nm). Thus we believe that the size of initial Ag nanospheres also greatly affects the optimized fluorescence quenching efficiency. These results about fluorescence quenching properties of Ag-dielectric-Au three-layered nanoshells present a potential for design and fabrication of fluorescence nanosensors based on tuning the geometry of the inner core and the separate layer.
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ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Xueyuan Li,Yang Xu,Yuxia Chen,Chen Wang,Jingjing Jiang,Jiangtao Dong,Hua Yan,Xuezhong Du
This paper reports dual enhanced electrochemiluminescence (ECL) of CdS quantum dot (QD)-decorated aminated Au@SiO2 core/shell (Au@SiO2-NH2/CdS) superstructures. A maximum ECL emission of the Au@SiO2-NH2/CdS superstructures (Au core, ca. 55 nm) with a silica shell of 38 nm was 35-fold stronger than that of the counterparts (containing neither Au cores nor amino groups) with H2O2 as a coreactant. The fold of ECL enhancement is the largest, and the optical path of maximum ECL enhancement is the longest reported so far. The larger the Au cores in the superstructures, the stronger the ECL emission of CdS QDs was. Two types of ECL enhancement mechanisms were clearly proposed for the dual enhanced ECL of the Au@SiO2-NH2/CdS superstructures. One was the electromagnetic field enhancement induced by localized surface plasmon resonance of Au cores, and the other was the chemical enhancement from amino groups modified on the silica surface involved in the ECL process in the assistance of H2O2. It is the first time to put forward the new concept of chemical enhanced ECL that was directly related to the participation of other chemicals, which caused a decrease in the difference in the redox potential between emitters and coreactants for the increase of their redox currents. The constructed ECL platform was demonstrated to have promising applications in highly sensitive detection of glutathione (GSH), and the response mechanism of GSH was also explored.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Xiong Lu,Lu Tao,Yanshan Li,Haiming Huang,Faming Gao
Various of nanomaterials have been applied for the construction of acetylcholinesterase biosensors to detect pesticides. In this work, a kind of network structure composed of bimetallic Pd@Au nanowires with high aspect ratio has been developed. The nanowires network structure not only provided multiple electron pathways, thus a better electrical conductivity, but also possessed enlarged electroactive surface area for the immobilization of enzyme which were due to the self-interconnecting nanowires. Moreover, the stability of the enzyme electrode was also improved. Combined with the intrinsic good electrical conductivity and electrocatalytic activity of the Pd@Au nanomaterials, the Pd@Au nanowires network electrode could be a promising platform for the electrochemical biosensing application. As a result, the developed biosensor based on Pd@Au nanowires network could detect malathion in the range of 0.1 pM to 100 nM with a detection limit of 0.037 pM, meanwhile, excellent reproducibility, high selectivity as well as good stability were also obtained. Besides, the biosensor could achieve a high accuracy in real samples analysis.
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