CHINESE JOURNAL OF CATALYSIS
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2020
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IF 6.146
Fan Wu,Lei He,Wen-Cui Li,Rao Lu,Yang Wang,An-Hui Lu
Supported-Au catalysts show excellent activity in CO oxidation , where the nature of the support has a significant impact on catalytic activity. In this work, a hexagonal boron nitride (BN) support with a high surface area and adequately exposed edges was obtained by the ball-milling technique. Thereafter, impregnation of the BN support with Cu(NO 3 ) 2 followed by calcination under air at 400 °C yielded a CuO-modified support. After Au loading, the obtained Au-CuO x /BN catalyst exhibited high CO oxidation activity at low temperatures with a 50% CO conversion temperature ( T 50% ) of 25 °C and a complete CO conversion temperature ( T 100% ) of 80 °C, well within the operational temperature range of proton exchange membrane fuel cells. However, the CO oxidation activity of Au/BN, prepared without CuO x for comparison, was found to be relatively low. Our study reveals that BN alone disperses both Cu and Au nanoparticles well. However, Au nanoparticles on the surface of BN in the absence of CuO species tend to aggregate upon CO oxidation reactions. Conversely, Au nanoparticles supported on the surface of CuO-modified BN remain small with an average size of ∼2.0 nm before and after CO oxidation. Moreover, electron transfer between Au and Cu species possibly favors the stabilization of highly dispersed Au nanoparticles on the BN surface and also enhances CO adsorption. Thus, our results demonstrate that thermally stable and conductive CuO-modified BN is an excellent support for the preparation of highly dispersed and stable Au catalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
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2015
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IF 4.097
Shicai Xu,Shouzhen Jiang,Jihua Wang,Jie Wei,Weiwei Yue,Yong Ma
An efficient surface enhanced Raman scattering (SERS) substrate has been developed based on highly ordered arrays of graphene–isolated Au nanoparticle (G/AuNP). By combining the electromagnetic enhancement activity of AuNP arrays and unique physical/chemical properties of graphene, the G/AuNP arrays shows high performance in terms of sensitivity, signal-to-noise ratio and reproducibility. The average enhancement factor obtained from the G/AuNP arrays for rhodamine 6G probe molecules is over 10 7 . The maximum deviations of SERS intensities from 20 positions of a same SERS substrate are in the range of 4.74% to 6.89% and from 20 different substrates in various batches are in the range of 5.67% to 8.37%, depending on different vibration modes . As a practical application of this SERS system, we detect the adenosine concentration in human serum. The detection results show a good linear correlation between SERS intensity and adenosine concentration within the range of 2 to 250 nM. This work may open up new opportunities in developing the applications of SERS in biomedical diagnostics, biological sensing and other biotechnology.
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CHEMICAL PHYSICS LETTERS
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2013
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IF 2.145
Yanling Liu,Feng Song,Jiadong Liu,Jun Zhang,Yin Yu,Hongyan Zhao
The enhanced luminescences of Er 3+ /Yb 3+ co-doped Y 2 Ti 2 O 7 films were demonstrated when silver/gold (Ag/Au) nanoparticles (NPs) were doped in the films. With the precipitation of the Ag nanoprisms, more intense green (525 nm, 546 nm), red (659 nm) upconversion (UC) emission bands and strong enhanced near infrared (NIR) emission were observed and the enhanced factors were up to 16.7, 15.6, 17.7 and 5.6 folds, respectively. The accordance between the local surface plasmon resonance of NPs and the UC emission band significantly increased the luminescence intensity. The efficiencies of the radiative emissions were enhanced also due to the hydroxyl groups primarily absorbed around the NPs.
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Advanced Materials Interfaces
·
2023
·Vol. 10
·期 23
·2300187
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IF 5.4
Juan Wang,Weijie Zhou,Qianwen Wei,Guangsheng Liu,Xibin Yuan,Hua Pen,Guijun Zhang,Rongfei Wang,Chong Wang,Yu Yang
Solar cells formed by spin-coating organic absorber layers on silicon have attracted widespread attention due to their simple processes and high photovoltaic conversion efficiency (PCE). In typical organic/Si solar cells, however, surface defects or unsatisfactory carrier separation are inadequate to yield excellent device performance. Here, the Au@MoS 2 nanocomposites are well synthesized and doped into the organic layer of poly (3,4-ethylenedioxythiophene)/polystyrene sulfonate (PEDOT:PSS) to improve its work function and the performance of PEDOT:PSS/Si HSCs consequently. By optimizing the doping level of Au@MoS 2 , the PCE significantly improved from 11.48% to 14.0% by tuning the work function of the PEDOT:PSS layer to more appropriate values. The calculated results based on the Mott–Schottky model indicate that the built-in field in the PEDOT:PSS/Si interface of HSCs is significantly enhanced due to the increase of work function by the PEDOT:PSS thin films. The enhancement of the built-in field results in the reduction of the electron–hole recombination loss effectively. The work provides a feasible method for preparing high-performance PEDOT:PSS/Si HSCs.
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Materials Science & Engineering C-Materials for Biological Applications
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2014
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IF 2.736
Fugui Xu,Fan Wang,Duanguang Yang,Yong Gao,Huaming Li
In this study, Au nanoparticles decorated graphene nanosheets were prepared using poly(vinylpyrrolidone) (PVP) covalently functionalized graphene oxide and chloroauric acid as template and Au precursor, respectively. Both the density and the size of Au nanoparticles deposited on the surface of graphene could be adjusted by the PVP grafting density. The graphene–Au hybrid nanosheets were then applied to fabricate a highly sensitive l -cysteine (L-CySH) electrochemical sensing platform. The cyclic voltammetry results showed that the modified glassy carbon electrode with graphene–Au hybrid nanosheets exhibited strong catalytic activity toward the electrooxidation of L-CySH. The current exhibited a widely linear response ranging from 0.1 to 24 μM with a low detection limit under the optimized conditions. The detection limit of L-CySH could reach as low as 20.5 nM (S/N = 3). The enhanced electrochemical performance of the fabricated sensor was attributed to the combination of the excellent conductivity of graphene and strong catalytic property of uniform Au nanoparticles.
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TALANTA
·
2016
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IF 4.035
Zhuang Li,Zhenzhen An,Yongyang Guo,Kangning Zhang,Xiaoling Chen,Dongxia Zhang,Zhonghua Xue,Xibin Zhou,Xiaoquan Lu
In this work, we report a novel Au-Pt bimetallic nanoparticles (Au-PtNPs) decorated on the surface of nitrogen-doped graphene (NG) functionalized with 1, 3, 6, 8-pyrene tetra sulfonic acid sodium salt (PyTS) by direct electrodeposition method. The results of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and electrochemical impendence spectrum (EIS) reveal that the Au-PtNPs were successfully anchored on the surface of NG sheets with a diameter of 20–40 nm. Further, the prepared Au-PtNPs/PyTS-NG nanocomposite exhibits superior catalytic activity for the oxidation of nitrite. Under optimal experimental conditions, an amperometric sensor with a linear range of 0.5–1621 μM and a detection limit of 0.19 μM (S/N=3) for the detection of nitrite was set up and applied to real samples.
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MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Ya Zhang,Yanying Zheng,Nansheng Li,Xiaolin Yang,Mingyuan Gao,Yun Zhang,Yali Yuan
The development of plasmonic nanozymes with light-controlled catalytic activity is crucial for advancing antibacterial therapy and microbial identification. Herein, we synthesized core–shell Au@Pd nanoparticles (Au@Pd NPs) with plasmon-enhanced activity for bacterial elimination and detection. The thin and porous Pd shell of Au@Pd NPs provided active sites and allow sufficient light to reach Au core. Under visible light, the peroxidase (POD)-like activity of Au@Pd NPs was significantly enhanced, with K m values decreased by 10 % (for TMB) and 15 % (for H 2 O 2 ), while V max increased by 2.1- and 2.8-fold, respectively, compared to dark conditions. The enhanced POD-like activity of Au@Pd NPs, mainly attributed to the hot charge carriers that enable efficient reactive oxygen species (ROS) generation, achieved 100 % killing efficiency against both Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). By contrast, killing rates reached only 90 % for E. coli and 80.1 % for S. aureus under dark conditions, indicating excellent light-responsive antibacterial activity. Moreover, the successful discrimination of six microorganisms was also obtained using the Au@Pd-TMB-H 2 O 2 system. Based on their different inhibitory effects on TMB oxidation, absorbance values at 652 nm and 452 nm were used as the sensing channels to capture the fingerprint spectra of each microorganism. Results of principal component analysis (PCA) and hierarchical cluster analysis (HCA) confirmed enhanced microbial identification under light. These findings highlight the promise of light-activated nanozymes for integrated antibacterial treatment and precise microbial sensing.
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DOI
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FUEL
·
2025
·
IF 7.5
Xiaoli Zhang,Yimin Wang,Li Cui,Yuewen Chen,Xiya Zhang,Yihu Ke,Zhen Yuan,Hai Liu,Zhile Xiong
The selective oxidation of glycerol to dihydroxyacetone (DHA) is an essential route to effectively utilize the by-product glycerol of biodiesel, but the difficulty in balancing the activity and recycling stability of the catalyst severely limits the practical application of this process. Herein, we utilize the morphology engineering strategy of Au-loaded Cu-Zn composite oxide catalyst to optimize the catalytic performance. By regulating the calcination temperature, the Cu 0.1 Zn 0.9 O-T supports with morphologies such as microrod clusters, microrods, microspheres and yolk shells are obtained, and a series of Au/Cu 0.1 Zn 0.9 O-T catalysts are synthesized by loading Au NPs prepared through the plant-mediated method. The glycerol oxidation experiments reveal that catalyst morphology exerts a significant influence on efficacy. Among the tested catalysts, the microrod-structured Au/Cu 0.1 Zn 0.9 O MR exhibited the best performance, achieving complete glycerol conversion (100 %) and a DHA selectivity of 82.3 %. Particularly, Au/Cu 0.1 Zn 0.9 O MR exhibits excellent cycling stability that outshines most current catalysts, while maintaining 68.8% glycerol conversion and 78.2 % DHA selectivity after five runs. The underlying mechanism of the influence of catalyst morphology on the glycerol conversion performance is further revealed by a series of characterizations and density functional theory calculations.
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NANO
·
2024
·
IF 1
Jianchao Wang,Ziqi Wu,Huayong Peng
Ordered Ag@Au hybrid nanotube arrays were prepared by a galvanic replacement reaction and subsequently evaluated for their effectiveness as substrates for enhancing the fluorescence of poly(3-hexylthiophene) (P3HT). Ordered AgNWs arrays were assembled using a three-phase interface method, and ordered Ag@Au hybrid nanotube arrays were successfully prepared by a galvanic replacement reaction between a HAuCl 4 solution and ordered AgNWs arrays. The morphology of the ordered silver nanowires (AgNWs) arrays and Ag@Au nanotube arrays, as well as the influence of reaction time on the galvanic replacement reaction, were investigated. The fluorescence and laser-Raman properties of the conjugated polymer P3HT on various ordered Ag@Au nanotubes were analyzed. Gold (Au) particles grow on the surface of AgNWs, the diameter of the nanotubes gradually increases, and the ordered Ag@Au hybrid nanotubes form gradually. The surface plasmon resonance (SPR) peaks of Ag@Au hybrid nanotube arrays redshift and become wider as the reaction proceeds compared to AgNW arrays. The fluorescence properties of P3HT films on various ordered Ag@Au hybrid nanotubes were much higher than those on bare silicon substrates, but compared to the gold nanowire array, there is a decrease. As the galvanic displacement reaction progresses, the degree of reduction in fluorescence intensity increases. The unique aspect of this work was that the plasmon resonance wavelength of the ordered Ag@Au hybrid nanotube arrays showed a substantial redshift and broadening, which is much closer to biological samples. The ordered Ag@Au hybrid nanotube arrays can be used as ultra-sensitive fluorescence sensing platforms.
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Small
·
2026
·
IF 11.8
Yanan Tang,Kaijian Luo,Peidong Li,Guohua Fan,Yao Liu
The dilemma of biological contamination and radiation pollution deriving from the widely used implantable monitor equipment and wearable electronics promotes the growing demand for integrated biological and electromagnetic protection materials. This work proposes Oxalis -mimicking nanosheet arrays of MoS 2 /Au on carbon cloth (CC@MoS 2 /Au) to exert a “kill three birds with one stone” effect. First, the biomimetic architecture imparts the planar substrate with mechano-bactericidal property, which is dependent on attractive interactions between sharp edges and adhered bacteria. Second, the integration of MoS 2 /Au nanohybrids triggers a photo-bactericidal mode, and the coupling of Au nanoparticles guarantees smooth fulfillment for higher photocatalytic efficacy. Such a synergistic action allows for a nearly 100% inactivation efficiency toward E. coli and S. aureus . Third, the engineered CC@MoS 2 /Au exhibits electromagnetic interference shielding effectiveness exceeding 40 dB in X band, equivalent to 99.99% impeding of incident waves. This work reported here to design of multifunctional platforms with antibacterial and electromagnetic interference shielding performance, which may create a powerful support to mitigate the issues of biological contamination and electromagnetic pollution in the field of modern healthcare.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 40
·期 1
·488-500
·
IF 2.93
Donghong Duan,Jianwei Liang,Huihong Liu,Xiu You,Huikai Wei,Guoqiang Wei,Shibin Liu
Carbon-supported Ni–Au nanoparticles with a core–shell structure (Ni@Au/C) are prepared by a combination of reverse microemulsion and two-step reduction. The prepared Ni@Au/C nanoparticles are used as anode electrocatalysts in direct borohydride-hydrogen peroxide fuel cells (DBHFCs). The physical and electrochemical properties of the as-prepared catalysts are investigated using transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical quartz crystal microbalance (EQCM), chronoamperometry (CA), chronopotentiometry (CP) and fuel cell test. The average size of the particles are approximately 10 nm. Among the resultant catalysts obtained in this study, the Ni 1 @Au 1 /C catalyst exhibits the highest catalytic activity for the direct electro-oxidation of borohydride . DBHFCs fabricated using Ni 1 @Au 1 /C as an anode catalyst and Pt mesh (1 cm × 1 cm) as a cathode electrode achieves a maximum power density of 74 mW cm −2 with a discharge current density of 130 mA cm −2 at 20 °C.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Biao Feng,Chengzhang Yao,Siyu Chen,Rui Luo,Shuhui Liu,Shanshan Tong
The design and synthesis of efficient adsorbing materials for recovery of precious metal are of paramount importance for fulfilling high-tech industry’s need. Herein, a one-step hydrothermal synthesis method was employed to construct the sulfur-rich MoS 2 nanoflakes under a mild condition. The first experiment evidence proved that MoS 2 nanoflakes were capable of capturing gold, with an extremely high uptake capacity (1133 mg g −1 ) and excellent selectivity. More importantly, MoS 2 nanoflakes showed preferential Au 3+ uptake behaviour compared with other precious metal ions such as Pd 2+ (47.6 mg g −1 ) and Pt 4+ (38.5 mg g −1 ). Different factors affecting the sorption process such as pH, adsorbent amount, contact time, ion strength , and reusability were systematically studied. The adsorption mechanism may be attributed to their intrinsically sulfur-rich characteristic for the strong soft–soft interactions between S atoms and Au atoms. These findings open up the possibility to expand the applications of sulfur-rich nanomaterials in the recovery of precious metal.
研究领域:
材料科学
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环境化学
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纳米技术
·
资源回收
·
配位化学
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危险品化学品经营许可证（带存储）