COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mei Hong,Xiaoling Xu,Bingyu Wang,Zhangbin Guan,Zhaoquan Zheng,Qiang Zhang
In this work, magnetic nanoparticles (Fe 3 O 4 ) immobilized with poly(4-vinylpyridine) (P4VP) brushes were prepared by Cu(0)-reversible deactivation radical polymerization (Cu(0)-RDRP) for the coordination of Au 3+ , which subsequently yielded Au nanoparticles by Fe 3 O 4 and ethanol reduction system to realize a green synthesis without using toxic chemicals. Morphology observation shows that Fe 3 O 4 @P4VP-Au nanocatalyst is distributed uniformly without significant agglomeration. Au nanoparticles with an average diameter of 2.71 nm are firmly anchored on the surface of Fe 3 O 4 @P4VP-Au by using P4VP brushes as a skeleton to support. The hybrid Fe 3 O 4 @P4VP-Au nanocatalyst demonstrates superior properties such as high structure stability, small size and uniform Au nanoparticles distribution, convenient reuse recovery, and good biocompatibility. It also has remarkable catalytic activity for nitrophenols and methylene blue . The catalytic activity can still keep above 98.5% even after ten cycles. This study presents a green and simple route for Au-nanocatalyst synthesis, which provides fresh insights and useful implications for designing efficient and sustainable Au nanocatalysts.
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高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Yuanyuan Qian,Furui Tan,Jun Liu,Qicong Li,Kuankuan Ren,Yanbin Huang,Xiaobao Li,Dawei Cao,Kong Liu,Chao Zhao,Yongxin Li,Zhijie Wang,Shengchun Qu
Plasmon-induced photocatalytic reactions are important in the process of conversion of solar energy into fuels. To efficiently harvest energetic charge carriers from light-excited plasmonic materials, contact of the metallic nanostructures with semiconductors is necessary. Herein, we report that, even on single Au nanowires that are not in contact with any semiconductors, prominent photocatalytic water oxidation reactions could be still observed. The involved Au nanowires have dimensions of 300 nm in diameter, and the fabricated nanoelectrode presents an obvious photocurrent of 0.4 mA/cm2 at the potential of 1.2 V vs Ag/AgCl. The corresponding incident photon-to-electron conversion efficiency is realized as 0.24% at the wavelength of 520 nm. Detailed investigations reveal that the hot holes around the d-band of the plasmonic nanomaterials are responsible for such photocatalytic behaviors. Our results provide a special perspective to the plasmon-related reactions.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hongjing Wang,Shiqian Jiao,Songliang Liu,Shengqi Wang,Tongqing Zhou,You Xu,Xiaonian Li,Ziqiang Wang,Liang Wang
Electrochemical water splitting is one hopeful strategy for hydrogen production, and designing efficient hydrogen evolution electrocatalysts under universal pH is one of the most critical topics. Here, we have successfully prepared mesoporous bimetallic core–shell nanostructures with Au nanowires (Au NWs) as cores and mesoporous Rh as shells (Au@mRh NWs). Due to the one-dimensional structure and mesoporous core–shell structure, Au@mRh NWs possess more active sites and provide the synergistic effect, leading to the great improvement of the electrochemical activity toward the hydrogen evolution reaction under a wide range of pH. The present work proposes a versatile strategy for preparing a bimetallic core–shell structure with a mesoporous shell, which is highly promising for more electrocatalytic applications.
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DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-6
·
IF 4.011
Khan M. Z. H.,Daizy M.,Tarafder C.,Liu X.
In this work, we have successfully synthesized core-shell structured Au-PDA@SiO 2 nanospheres and decorated on reduced graphene oxide (rGO) modified glassy carbon electrode for the electrochemical detection of cefotaxime. The one-pot hydrothermal method was used to synthesis core-shell nanostructures by loading Au nanoparticles on polydopamine (PDA) coated SiO 2 nanospheres. The as-prepared Au-PDA@SiO 2 nanospheres were used to fabricate electrochemically reduced graphene oxide (rGO) modified glassy carbon electrode (Au-PDA@SiO 2 /rGO/GCE) for electrochemical determination of cefotaxime. Scanning electron microscopy, powder x-ray diffraction, transmission electron microscopy, and Fourier-transform infrared spectroscopy were used to confirm the structure and morphology of the as-prepared nanospheres. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed for electrochemical characterizations different modified electrodes. It was revealed that the nanocomposite modified electrodes exhibited excellent electrochemical performances for electrooxidation of target analytes and could achieve ultra-sensitive detections. A linear relationship was observed between peak currents and concentrations in the ranges of 1.0 × 10 −9 to 5.0 × 10 −8 M ( R 2 = 0.9877), and 1.0 × 10 −7 to 5.0 × 10 −6 M ( R 2 = 0.9821) for cefotaxime with a detection limit (S/N = 3) of 1.0 × 10 −10 M. It can be deduced that the proposed sensor is suitable for the sensitive detection of cefotaxime in pharmaceutical samples.
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Na Li,Changhong Wang,Tingzhen Li,Brendan Latimer,Zhen Liu,Zhenghua Tang
Bimetallic nanoparticles with core-shell structure usually demonstrate enhanced catalytic performance due to the lattice strain created between the core and the shell region. The Au@Ag core-shell nanoparticles with different Au-to-Ag molar ratios were firstly fabricated by a facile method under mild conditions, and the n(Au): n(Ag) = 1: 2 sample showed the best electrocatalytic activity toward oxygen reduction reaction (ORR), a key reaction which plays an important role in fuel cells and metal-air batteries. Subsequently, the Au@Ag nanoparticles of n(Au): n(Ag) = 1: 2 were loaded on carbon nanotubes to prepare nanocomposite catalysts with different metal mass ratios of 20% Au@Ag/CNTs, 30% Au@Ag/CNTs, 40% Au@Ag/CNTs, and 50% Au@Ag/CNTs. The characteristics of the as-synthesized nanocomposites were examined by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) as well. The nanocomposites demonstrated effective electrocatalytic performance toward ORR. Electrochemical tests showed that the 30% Au@Ag/CNTs sample exhibited the highest activity among the series, in aspects of onset potential and kinetic current density. Furthermore, the sample of 30% Au@Ag/CNTs exhibited markedly higher long-term stability than Pt/C. The results clearly illustrate that the Au@Ag core-shell nanoparticles-based nanocomposites hold great potentials as efficient ORR catalysts for fuel cell applications.
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 60
·54964-54975
·
IF 3.289
Jian Zeng,Ting Song,Meixiang Lv,Tingting Wang,Jiayi Qin,Heping Zeng
A Au/g-C3N4/NiFe2O4 nanocomposite was successfully prepared and characterized, and it exhibited a significant visible-light-driven photoactivity for hydrogen production. The results suggested that NiFe2O4 was closely coupled with flake-like g-C3N4 and Au nanoparticles were successfully loaded onto the surface of an optimal g-C3N4/NiFe2O4 nanocomposite. Subsequently, the photocatalytic hydrogen evolution of the as-prepared sample was investigated and optimized, indicating that the optimal Au/g-C3N4/NiFe2O4 ternary nanocomposite with AuNP loading of 1.0 wt% showed the highest hydrogen generation rate of 1.607 mmol g−1 h−1, which was 30.9 times and 28.7 times higher than the values of pure NiFe2O4 and pure g-C3N4, respectively, whereas the optimized g-C3N4/NiFe2O4 binary nanocomposite with NiFe2O4 coupled at 49.4% exhibited a hydrogen generation rate of 0.351 mmol g−1 h−1. Interestingly, the photocatalytic hydrogen production mechanism was also tentatively proposed as promoted charge carrier transfer and the strong surface plasmon resonance (SPR) effect of AuNPs via PL, EIS and photocurrent measurements was verified.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·Vol. 28
·期 8
·2669-2677
·
IF 2.6
Xia Xiaohong,Duolihong Bawurejiang,Ma Xiangdong,Yue Shan,Liu Rui
Electrochemical biosensor based on horseradish peroxidase (HRP) modified gold nanoparticle/sulfur-doped graphene (AuNP/SG) has been developed for the quantification of trans -resveratrol (Res). Gold nanoparticle (AuNP) was selected as the carrier for HRP due to its excellent electrochemical catalytic activity, biocompatibility, and conductivity, while sulfur-doped graphene (SG) was selected as the support for AuNP due to the defects introduced in the carbon network by sulfur doping can facilitate the high dispersion state of AuNP and HRP. The results show that the excellent sensing performance of the HRP/AuNP/SG is attributed to the high charge polarization of material after sulfur dropping and the co-catalysis of HRP and AuNP. For the detection of Res, linear response can be observed with high sensitivity and low detection limit (4 × 10 −8 M). Further, this electrochemical biosensor presents strong reproducibility, stability, and anti-interference capability in detecting Res. These unique properties make it an excellent choice for Res reliable detection.
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 1
·7-16
·
IF 1.3
Xiong Wenhao,Wang Wenbo,Long Yuting,Li Hong
The surface-enhanced Raman scattering (SERS) optical fiber probes were successfully prepared by self-assembling on polyelectrolyte multilayers. Gold nanorods (Au NRs) were used as SERS enhancement material to give excellent biological affinity and stability to the SERS optical fiber probes. Au NRs were synthesized by seed growth method. The synergistic effect between AgNO 3 and surfactant was investigated, and the highest yield was found when AgNO 3 was 500 uL. Meanwhile, different SERS optical fiber probes were obtained by selecting silane coupling agent, polyelectrolyte multilayer and graphene oxide (GO) to treat quartz fiber. It was found that the SERS optical fiber probes obtained by the self-assembled on polyelectrolyte multilayers method performed better than those by other methods. In addition, Mapping was combined with finite element simulation to analyze the electromagnetic field distribution at the fiber end face. The electromagnetic field distribution of Au NRs was investigated, the difference of electromagnetic field intensity around the Au NRs with different arrangements was compared, the strongest signal was obtained when the Au NRs were head-to-head. Finally, sensitivity of the optimized SERS optical fiber probes could reach 10 −9 mol/L, with excellent stability and repeatability.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Xulin Wang,Xiuzhen Zheng,Huijuan Han,You Fan,Sujuan Zhang,Sugang Meng,Shifu Chen
Glucose, as one of the most familiar biomass, can be utilized to produce hydrogen and fine chemicals. This work reports the renewable hydrogen production from glucose over Au/CdS-nanorods (Au/CdS-NRs) photocatalyst . For Au/CdS-NRs catalyst, it shows a superior H 2 evolution rate of 90.0 μmol g −1 h −1 under visible light irradiation. Moreover, the H 2 generation from the glucose solution on Au/CdS-NRs prepared by twice solvothermal method is much higher than Au colloid and photoreduction methods. Prepared with twice solvothermal method, Au nanoparticles are obtained from Au 3+ ions on the CdS surface, as Au 3+ can be reduced by photogenerated electrons. The separated hole can oxidize glucose to produce protons, and protons can be reduced by photogenerated electrons into H 2 . Meanwhile, the Au/CdS-NRs can also be used to produce H 2 from other biomasses, for instance sucrose, soluble starch, celluflor, pectin and waste paper scraps. The probable mechanism is proposed and discussed in the photocatalytic process from glucose reforming. This work indicates that the process of self-reducing Au 3+ to Au can drastically increase the photocatalytic efficiency of H 2 evolution from biomass, by promoting the separation and transportation of photogenerated charge carriers.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Xiaomu Shan,Jie Pan,Xuejian Du,Jian Shi,Zhuofan Wei,Yuanze Xu,Shouzhen Jiang
The excellent performance of surface-enhanced Raman spectroscopy (SERS) is closely related to the intensity, density and uniformity of hotspots. In this study, we introduce a PET/Au NPs@COF Raman substrate featuring three-dimensional hotspots. The spacing between each layer of gold nanoparticles (NPs) is precisely controlled by adjusting the thickness of the COF via the interfacial synthesis technique, causing the strong coupling between gold particles across the layers. The porosity of the COF enables the substrate to adsorb numerous analyte molecules into the large-area uniform hotspots. Through simulations and adsorption detection on the substrate, Raman testing further demonstrated that the substrate with double-layer Au NPs@COF exhibited the most favorable SERS performance. Additionally, the substrate allows for selective detection based on the particle size of the target molecule. The flexibility of the substrate enables it to conform to irregular surfaces, effectively capturing analytes from a variety of real samples.
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产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2025
·
IF 10.7
Zhenghuan Yin,Yajun He,Peiyu Huang,Wenjie Ma,Jian Liang,Tianyi Wang,Yuhao Peng,Wei Xiao,Dong Gu
Formaldehyde (HCHO) is a major indoor air pollutant that poses serious risks to human health, making its efficient removal a critical environmental concern. Catalytic oxidation at room and sub-ambient temperatures has attracted significant attention due to its potential to completely decompose HCHO into harmless CO2 and H2O. However, practical implementation remains challenging because of low reaction activation energy and limited catalyst performance at reduced temperatures. In this study, Au-loaded manganese oxide nanowire catalysts (x% Au/MnO2-NWs) were synthesized using a colloidal deposition strategy to achieve efficient HCHO removal under ambient and sub-ambient conditions. The optimized 1% Au/MnO2-NWs catalyst achieved complete conversion of 280 ppm HCHO at 30 °C and, remarkably, fully oxidized 20 ppm HCHO even at 0 °C, demonstrating outstanding low-temperature activity and practical potential. Comprehensive characterization studies including H2-TPR, EPR, Raman spectroscopy, and in situ DRIFTS revealed that Au nanoparticles induced abundant oxygen vacancies, which acted as active sites for HCHO adsorption and promoted O2 activation. The synergistic interaction between Au and MnO2 significantly enhanced low-temperature catalytic performance, providing mechanistic insights and a solid foundation for the rational design of highly efficient catalysts for indoor formaldehyde removal.
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yahui Ji,Nana You,Xiaoping Hu,Fei Wang,Gen Liu
The environmental hazards posed by bisphenol A (BPA) have become a critical global concern. Consequently, the development of rapid, user-friendly, and highly sensitive methods for BPA detection is essential for pollution control and health risk assessment. In this study, a novel electrochemiluminescent (ECL) sensor was designed using Ru(bpy) 3 2+ -encapsulated Zn-based metal–organic frameworks (Ru-ZnMOF) integrated with gold nanoparticles (Au@Ru-ZnMOF) as efficient ECL probes. Notably, BPA caused a significant quenching effect on the ECL signal of Au@Ru-ZnMOF in the presence of tripropylamine (TPA) as a coreactant. Under optimized experimental conditions, a glassy carbon electrode modified with Au@Ru-ZnMOF (glassy carbon electrode (GCE/Au@Ru-ZnMOF) demonstrated exceptional ECL performance for BPA detection, with a broad linear detection range (1.0 × 10 −9 to 5.0 × 10 −4 mol·L −1 ) and an ultra-low detection limit of 2.5 × 10 −11 mol·L −1 . The proposed sensor was successfully applied for the quantification of BPA in thermal paper samples, achieving recovery rates between 95.8 % and 98.5 %, confirming its high accuracy and reliability.
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高影响因子
危险品化学品经营许可证（带存储）