Plasmonics
·
2016
·Vol. 12
·期 3
·663-673
·
IF 2.146
Lu Mengdi,Liang Yuzhang,Qian Siyu,Li Lixia,Jing Zhenguo,Masson Jean-Francois,Peng Wei
In this paper, we report a novel wavelength interrogation-based surface plasmon resonance (SPR) system, in which a film of three Ag layers and three Au layers are alternately deposited on a Kretschmann configuration as sensing element. This multilayer film shows higher sensitivity for refractive index (RI) measurement by comparing with single Au layer structure, which is consistent with its theoretical calculation. A sensitivity range of 2056–5893 nm/RIU can be achieved, which is comparable to RI sensitivities of other wavelength-modulated SPR sensors. Compared with Ag film, this Ag/Au multilayer arrangement offers anti-oxidant protection. This SPR biosensor based on a cost-effective Ag/Au multilayer structure is applicable to the real-time detection of specific interactions and dissociation of low protein concentrations. To extend the application of this highly-sensitive metal film device, we integrated this concept on an optical fiber. The range of RI sensitivities with Ag/Au multilayer was 1847–3309 nm/RIU. This miniaturized Ag/Au multilayer-based fiber optic sensor has a broad application in chemical and biological sensing.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shan Tang,Qun Zhao,Yifeng Tu
This paper describes a novel approach to promote the analytical performance of electrochemiluminescent (ECL) biosensor of cholesterol by a nanocomposite (Au nanoparticles/ion liquid/hollowed TiO 2 nano-shell) pre-functionalized indium tin oxide glass to load the cholesterol oxidase. Here the enzymatically produced hydrogen peroxide greatly intensified the ECL of luminol under the catalysis of the nanocomposite. The quantification of cholesterol was directly accomplished by calibrating the ECL sensing output. The formation and properties of the nanocomposite and the functionalized electrode have been confirmed by electrochemistry , spectroscopy and electron-microscopy. The prepared biosensor exhibits a linear regression ranged from 8.33 × 10 −9 M to 4.17 × 10 −7 M with an ultralow detection limit (LOD) of 6.30 × 10 −9 M. It also possesses the excellent specificity for cholesterol from potential interferents , the favorable repeatability/stability for use or storage, the good reproducibility and adequate recovery for real sample test. In addition, for the detection of clinical serum sample, it is well consistent with the datum from medical cholesterol kit, indicating its reliability. It is in promising of the application for the cholesterol detection in those clinical specimens of teeny amount of sample and limited concentration.
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TALANTA
·
2016
·
IF 4.035
Tianbao Li,Juan Xu,Lei Zhao,Shaofei Shen,Maosen Yuan,Wenming Liu,Qin Tu,Ruijin Yu,Jinyi Wang
An Au nanoparticles/poly(caffeic acid) (AuNPs/PCA) composite modified glassy carbon (GC) electrode was prepared by successively potentiostatic technique in pH 7.4 phosphate buffer solution containing 0.02 mM caffeic acid and 1.0 mM HAuCl 4 . Electrochemical characterization of the AuNPs/PCA-GC electrode was investigated by electrochemical impedance spectroscopy and cyclic voltammetry . The electrochemical behavior of acetaminophen (AP) at the AuNPs/PCA-GC electrode was also studied by cyclic voltammetry. Compared with bare GC and poly(caffeic acid) modified GC electrode, the AuNPs/PCA-GC electrode was exhibited excellent electrocatalytic activity toward the oxidation of AP. The plot of catalytic current versus AP concentration showed two linear segments in the concentration ranges 0.2–20 µM and 50–1000 µM. The detection limit of 14 nM was obtained by using the first range of the calibration plot. The AuNPs/PCA-GC electrode has been successfully applied and validated by analyzing AP in blood, urine and pharmaceutical samples.
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PubMed
高影响因子
LANGMUIR
·
2016
·
IF 3.993
Yingzhou Tao,Anirban Dandapat,Liming Chen,Youju Huang,Yoel Sasson,Zhenyu Lin,Jiawei Zhang,Longhua Guo,Tao Chen
We report a very easy and effective approach for synthesizing unique palladium-on-gold supra-nanostructure (Au@Pd-SprNS)-decorated graphene oxide (GO) nanosheets. The SprNSs comprising Au nanorods as core and a unique close-packed assembly of tiny anisotropic Pd nanoparticles (NPs) as shell were homogeneously distributed on the GO surface via electrostatic self-assembly. Compared with the traditional one-pot method for synthesis of metal NPs on GO sheets, the size and shape of core–shell Au@Pd SprNSs can be finely controlled and uniformly distributed on the GO carrier. Interestingly, this Au@Pd-SprNSs/GO nanocomposite displayed high electrocatalytic activities toward the oxidation of methanol, ethanol, and formic acid, which can be attributed to the abundance of intrinsic active sites including high density of atomic steps, ledges and kinks, Au–Pd heterojunctions and cooperative action of the two metals of the SprNSs. Additionally, uniform dispersion of the SprNSs over the GO nanosheets prevent agglomeration between the SprNSs, which is of great significance to enhance the long-term stability of catalyst. This work will introduce a highly efficient Pd-based nanoelectrocatalyst to be used in fuel cell application.
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Journal of the American Chemical Society
·
2017
·
IF 13.858
Xingzhong Zhu,Hang Kuen Yip,Xiaolu Zhuo,Ruibin Jiang,Jianli Chen,Xiao-Ming Zhu,Zhi Yang,Jianfang Wang
The synthesis of metal nanostructures with plasmon wavelengths beyond ∼1000 nm is strongly desired, especially for those with small sizes. Herein we report on a AgPd-tipping process on Au nanobipyramids with the resultant red plasmon shifts reaching up to ∼900 nm. The large red plasmon shifts are ascribed to the deposition of the metal at the tips of Au nanobipyramids, which is verified by electrodynamic simulations. The method has been successfully applied to Au nanobipyramids and nanorods with different longitudinal dipolar plasmon wavelengths, demonstrating that the plasmon wavelengths of these Au nanocrystals can be extended to the entire near-infrared region. Pt can also induce the tipping on Au nanobipyramids and nanorods to realize red plasmon shifts, suggesting the generality of our approach. We have further shown that the metal-tipped Au nanobipyramids possess a high photothermal conversion efficiency and good photothermal therapy performance. This study opens up a route to the construction of Au nanostructures with plasmon resonance in a broad spectral region for plasmon-enabled technological applications.
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RSC Advances
·
2016
·Vol. 6
·期 102
·100427-100436
·
IF 3.289
Binbin Ding,Yuming Zhou,Man He,Tingyuan Huang,Shiwei Li,Shuang Huang,Wenlu Pan
We report uniform hollow CeO2/Au/C nanocatalysts with hierarchical structures fabricated successfully via an etching process. The whole preparation method involves the synthesis of SiO2 spheres, a sequential deposition of CeO2, Au NPs of 2–5 nm and then C layers through hydrothermal processes, crystallization of C by calcination and finally etching of the inner silica spheres to construct the hollow structures. The as-obtained nanostructures are characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), UV-Vis spectroscopy and energy dispersion X-ray spectroscopy (EDX). The CeO2/Au/C composite shows a multilayer structure including the hollow ceria spheres and the C layers, where Au NPs are located between the two layers. In this work, the reduction of 4-NP is employed as a model reaction to test the catalytic performance. The results indicate that the hollow CeO2/Au/C nanospheres exhibit a higher catalytic performance, comparing with the hollow CeO2/Au and Au/C nanospheres. The presences of the C shells and CeO2 layers can improve the catalytic activity. In addition, the hollow CeO2/Au/C structures can be easily recycled without an obvious decrease of the catalytic activities in the reaction.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 12
·7186-7198
·
IF 2.599
Chen Lifang,Zhou Yuanyuan,Gui Zhenyou,Cheng Hongye,Qi Zhiwen
Gold nanoparticles (NPs) confined in hybrid shells of organic linker-assisted silica nanospheres (GOS) have been prepared through a facile approach using organic amino functional groups covalently bound to shells of silica nanospheres for anchoring AuCl 4
− . Due to the hydrolysis of urea, the gold precursor was in situ reduced in the hybrid shells of silica nanospheres under desired alkaline and temperature conditions. Organic functional groups (–SiCH 2 CH 2 CH 2 NHCH 2 CH 2 NH 2 ) were introduced into shells of silica nanospheres via a co-condensation of tetraethyl orthosilicate and 3-(2-aminoethylamino)propyl dimethoxymethylsilane. The results indicate that Au NPs with <2 nm diameters were highly dispersed and well confined in the hybrid shells of silica nanospheres through the anchorage of organic functional groups under condensation process. The obtained GOS catalyst exhibited efficient catalytic activity for solvent-free catalytic oxidation of cyclohexane with 94.8% selectivity to cyclohexanone and cyclohexanol (KA oil) and adipic acid under 150 °C, 1.5 MPa O 2 for 3 h.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Tianrong Zhan,Zhengwei Tan,Xia Tian,Wanguo Hou
Self-assembly of graphene oxide (GO) and Au nanoparticles (AuNPs) was covalently modified by ionic liquid (IL) containing amino groups to prepare the ternary nanocomposite of IL-GO-AuNPs. UV, IR spectra, X-ray power diffraction and scanning electron microscope confirmed the successful hybridization of these three components, leading to the larger surface area and better dispersity. Then a sensitive 2,4-Dichlorophenol (2,4-DCP) sensor was established based on IL-GO-AuNPs modified glassy carbon electrode. The IL-GO-AuNPs composite gave rise to a desirable access to the electron transfer and electrocatalytic capacity toward the oxidation of 2,4-DCP. Differential pulse voltammetry was employed for the quantitative analysis of 2,4-DCP. The proposed sensor showed a wide linear range from 0.01 to 5 μM with a low detection limit of 3 nM (S/N = 3). The developed sensor was successfully used for the determination of 2,4-DCP in water samples with satisfactory recoveries and stability. The excellent electrocatalytic performance could be attributed to the high conductivity and more active sites of IL-GO-AuNPs.
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CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Xiang Xie,Xinzhen Wang,Jian Tian,Jiurong Liu,Huili Cao,Xiaojie Song,Na Wei,Hongzhi Cui
Au decorated ZnO flower-like architectures assembled from single crystal nanowires have been successfully synthesized. A facile thermal treatment route was employed, utilizing the composite gel of zinc acetate and polyvinyl pyrrolidone (PVP) as raw materials and was followed by a subsequent Au reduction process. PVP served as a surfactant and played a critical role in the generation of crystalline nanowires as well as for the formation of ZnO flower-like structure. Based on control experiments, the growth mechanism of ZnO flower-like structures was proposed. The diameter of ZnO crystalline nanowires was approximately 50–80 nm and the size of Au particles deposited on the surface of ZnO nanowires was approximately 5 nm. When tested as gas sensing material, the as-prepared Au decorated ZnO flower-like architecture exhibited superior gas sensing performance compared to ethyl acetate in terms of high response (approximately 102 at 100 ppm), short response and recovery times (10 s and 13 s, respectively), and low operating temperature (240 °C). The superior gas sensing performances are mainly attributed to the synergistic effects of ZnO crystalline nanowires and Au nanoparticles , as well as to the flower-like structure.
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CRYSTENGCOMM
·
2017
·Vol. 19
·期 44
·6588-6593
·
IF 3.474
Yu Han,Wenxing Wang,Penglin Jiang,Yucong Yan,Hui Zhang,Deren Yang
Au nanorings are of particular interest in catalysis owing to their fascinating properties, however, it still remains a tremendous challenge to generate such hollow nanostructures with small size. Here, we report the synthesis of Au nanorings with an outer diameter of less than 20 nm by a seed-mediated approach with Pd nanoplates as seeds in the presence of Ag+ ions. The incorporation of Ag+ ions substantially slows down the reduction rate of the Au precursor through an underpotential deposition (UPD) process, leading to the formation of small Au nanoparticles. These small Au nanoparticles then coalesced into nanorings on small Pd nanoplates. The outer diameter of the Au nanorings is tuned by varying the size of the Pd nanoplates. The smallest Au nanorings are evaluated as catalysts towards the hydrogenation of 4-nitrophenol, showing substantially enhanced catalytic activity relative to the Au nanoparticles with the same size. This enhancement in the catalytic activity can be attributed to the unique structural features including the large specific surface areas, convenient accessibility of both interior and exterior surfaces for the reactants, and existence of highly active sites in the interior part.
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RSC Advances
·
2016
·Vol. 6
·期 114
·113115-113122
·
IF 3.289
Chunyan Wang,Yi Xu,Conghui Deng,Zhixu Liu,Rong Wang,Huazhou Zhao
In the present paper, we report on the design and fabrication of a recyclable microfluidic SERS chip with an integrated Au@Ag/TiO2 NTs (gold core silver shell nanoparticles (NPs) with decorated TiO2 nanotube arrays (NTs)) composite SERS substrate. The stripped TiO2 NTs with regularly arranged pore structures were prepared on a Ti foil by easy tape lithography followed by anodic oxidation. The Au@Ag NPs were fabricated on the mouth surface and the inner walls of the TiO2 NTs within a microchannel without clogging via a facile self-assembly chemical plating composite method. Under optimized conditions, the microfluidic SERS chip provided excellent sensitivity to R6G molecules with a detection limit of 10−10 M and a SERS enhancement factor (EF) of 1.15 × 108. Versus single Au NPs, Au@Ag NPs and the Au@Ag/TiO2 plate, the optimized Au@Ag/TiO2 NTs showed improved SERS peak intensities for the C–C–C bending (613 cm−1) of 20, 2.3 and 1.6 times enhancement, respectively. The enhancement effect was attributed to both electromagnetic and chemical enhancement. The photocatalytic performance of the Au@Ag/TiO2 NTs was exploited to recycle the microfluidic SERS chip through UV light photocatalytic purification. The experimental result shows that the microfluidic SERS chip featured high reproducibility and could be used as an efficient SERS detector for many biochemical molecules.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 4
·869-876
·
IF 1.3
Zhang Yanwei,Wang Yanze,Li Junguo,Xie Jingjing,Wang Wenxuan,Fu Zhengyi
We synthesized BiVO 4 mesocrystals with ordered assembly structure, and studied the structural order and the relationship between the photodegradation of Rhodamine B. Au nanoparticles (NPs) were successfully loaded onto Meso-BiVO 4 by light-assisted induction, and Cd nanoparticles were further selected to be deposited on Au nanoparticles to form Z-scheme photocatalyst Meso-BiVO 4 -Au-CdS heterostructures. We try and propose to analyze its ordered assembly structure by XRD for the first time. The results show that Meso-BiVO 4 is a mesocrystal with highly exposed (001) plane and directional assembly structure. The charge separation efficiency of all samples was studied by PL spectroscopy. The results show that the Z-scheme Meso-BiVO 4 -Au-CdS can promote the charge separation and obtain the best carrier separation efficiency. Thus, it has the best photocatalytic activity in the experiment of photocatalytic degradation of rhodamine B. The main active species in the degradation process were confirmed by free radical trapping experiment, and the degradation mechanism was put forward.
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