CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2014
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IF 0.7
Wei-Wei WANG,Yu QIU,Shao-Peng ZHANG,Jia-Wei LI,Xiao-Quan LU,Xiu-Hui LIU
A novel hydrogen peroxide sensor was fabricated by the seed-mediated growth method. Firstly, polyethyleneimine (PEI) functionalized multiwalled carbon nanotubes (MWNTs) were used as growth scaffold on a glass carbon electrode (GCE). Then, Au nanoparticles were uniformly electrodeposited as seeds. Finally, Pt nanoparticles (PtNPs) grew on Au PtNPs to form Pt@Au core-shell structure nanocomposite. A new type of electrochemical sensor based on Pt@Au/PEI-MWNTs nanocomposites for detection of hydrogen peroxide was then developed, and the designed Pt@Au/PEI-MWNTs/GCE was characterized by electrochemical methods and field emission scanning electron microscopy (FESEM). The differential pulse experiment results showed that the modified electrode exhibited excellent electrocatalytic activity towards the reduction of H 2 O 2 with the wide linear range from 9.2×10 −8 to 1.3×10 −3 M. The correlation coefficient was 0.9994 and the detection limit was down to 3.1×10 −8 M at the signal-to-noise ratio of 3.
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高影响因子
ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Lu-Lu Qu,Da-Wei Li,Li-Xia Qin,Jin Mu,John S. Fossey,Yi-Tao Long
A novel surface-enhanced Raman scattering (SERS) nanosensor was developed by modifying oxidized cytochrome c (Cyt c) on gold nanoparticles (Au NPs) for the sensitive and selective determination of intracellular superoxide anion radical (O2•–). On the basis of the differences in the SERS spectra between the oxidized and reduced form of Cyt c, this nanosensor could be employed to investigate O2•– concentration by measuring the SERS spectra of the reduced Cyt c. Using this SERS nanosensor, a detection limit of 1.0 × 10–8 M for O2•– could be attained. Additionally, the selectivity of the SERS nanosensor for O2•– was examined, showing that other reactive oxygen species (ROS) and biologically relevant species did not influence the detection of O2•–. More importantly, the nanosensor could be delivered to the living HeLa and normal human liver cells and permitted the concentration of O2•– to be monitored in real time and in a noninvasive manner, which indicates that this nanosensor will be suitable for the qualitative and quantitative analysis of O2•– in biosystems, thus leading to a greater understanding of oxidative-stress-related diseases at a cellular level.
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PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
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IF 2.288
Yu-zhi Su,Qi-zhi Xu,Qi-sui Zhong,Chan-juan Zhang,Shu-ting Shi,Chang-wei Xu
Glycerol has a very high value of onset potential on the Au/C electrode, so it is difficult to be electrochemically oxidized on the pure Au electrocatalyst. When Co 3 O 4 , NiO, Mn 3 O 4 and MgO are added to the Au/C, the values of onset potential of glycerol oxidation shift negatively 171, 191, 156 and 215 mV than that on the Au/C. Au–Co 3 O 4 (wt 4:1)/C, Au–NiO(wt 5:1)/C, Au–Mn 3 O 4 (wt 5:1)/C and Au–MgO(wt 2:1)/C show the highest activity for glycerol electrooxidation for respective oxide promoted Au/C. The addition of oxides to the Au/C obviously promotes the catalytic activity and stability for glycerol electrooxidation.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 12
·7186-7198
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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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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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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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Journal of Physical Chemistry C
·
2015
·
IF 4.772
Yan Song,Guixia Liu,Xiangting Dong,Jinxian Wang,Wensheng Yu,Jingmei Li
Multifunctional nanomaterials possessing upconversion luminescence, magnetic, and photothermal properties show promising applications in biology and medicine. In this study, a new kind of luminescent-magnetic-thermal core–shell hybrid nanocomposite was fabricated combining rare earth Yb3+ and Er3+ ions doped NaGdF4 nanocrystals as shell layer materials and gold nanorods (AuNRs) as cores. The structure, morphology, composition, and properties of the multifunctional hybrid nanocomposites were characterized by X-ray powder diffraction, transmission electron microscopy, energy dispersive spectroscopy, upconversion photoluminescence spectra, vibrating sample magnetometer, sensitive thermometer, and cytotoxicity assessment, respectively. The multifunctional hybrid nanocomposites have rodlike morphology and core–shell structure. The uniform NaGdF4/Yb3+,Er3+ shell with a thickness of around 4.5 nm was coated on the surface of AuNRs with a length of 40 nm and a diameter of 12 nm. The AuNRs@NaGdF4/Yb3+,Er3+ multifunctional nanocomposites provide an excellent upconversion emission under excitation at 980 nm and a superparamagnetic behavior with magnetic susceptibility of 8.0 × 10–5 emu·g–1·Oe–1 at 300 K and saturation magnetization value of 102 emu·g–1 at 2 K. More significantly, when AuNRs@NaGdF4/Yb3+,Er3+ aqueous suspensions of 100 μg·mL–1 were irradiated by a 980 nm NIR laser for 10 min, the temperature was significantly elevated to 48 °C. At the same time, the temperature of photothermal transduction can be easily controlled by adjusting the concentration of nanocomposites. Preliminary investigation of incubating with HeLa cells displays that the multifunctional nanocomposites exhibit a good biocompatibility. Moreover, the nanocomposites may be effectively utilized for bioimaging and photothermal therapy in living cells.
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CURRENT APPLIED PHYSICS
·
2015
·
IF 2.212
Hongyan Zhang,Zhenhong Jia,Xiaoyi Lv
A technique is demonstrated to detect DNA hybridization based on surface layer of Au/porous silicon microcavity (Au/PSM) substrate for very small amount of biomolecules. Simulations show that the increase of effective refractive index for the first layer of PSM will cause a blue shift for its reflectance spectrum, and the blue shift becomes less with the increase of refractive index for one more layers. In experiments, such a blue shift of reflectance spectrum of PSM comes from the increase of refractive index by DNA hybridization on the surface. The detection limit of Au/PSM biosensor is 15.15 nM for 19-base pair DNA, which is comparable to that of reported biosensors based on porous silicon (PS). Therefore such an Au/PSM could be very useful to develop simple, rapid and sensitive optical biosensors when the amount of target is very small.
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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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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Shuo Zhang,Jun Liu,Chao Shang,Mingzhen Hu,Hexin Zhou,Xuemin Hu,Wenxiu Yang,Erhong Duan,Zhuozhi Wang,Jie Xu,Shuo Wang
Transfer hydrogenation of unsaturated nitro compounds by NH 3 BH 3 is an important hydrogenation reaction. Among them, Au/TiO 2 catalysts could achieve good activity for this reaction, but often have problem such as the selectivity decline. In this study, we prepare PVA-wrapped Au nanoparticles, and then load them onto TiO 2 support to obtain Au/TiO 2 catalyst. We demonstrate that the prepared catalyst after calcination has achieved high activity (>99 %) and high selectivity (99 %) in the transfer hydrogenation of 4-nitrostyrene (4-NS) within 30 min by NH 3 BH 3 under ambient temperature and pressure. In addition, the catalyst can still maintain high selectivity (>97 %) after being recycled for 5 times, showing its remarkable stability and reusability. Characterization results and density functional theory (DFT) calculations showed that the presence of Au-OH species accelerates the dehydrogenation of NH 3 BH 3 and thus enhances the catalytic activity. Meanwhile, Au-OH species and low-coordinated Au are beneficial to enhance nitro adsorption and improve the selectivity of transfer hydrogenation reaction. This study provides new ideas for the rational design of high-performance green gold catalytic transfer hydrogenation reactions.
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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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Nanoscale
·
2024
·Vol. 16
·期 29
·13938-13944
·
IF 5.8
Dan Xie,Youyou Deng,Xunlong Ji,Yiyan Zhang,Wentao Zhang,Zijin Hong,Wenjing Liu,Jingjing Du,Zhenli Sun
A novel breakthrough has been achieved in gas detection through the innovative application of surface-enhanced Raman scattering (SERS) to hydrogen (H2) detection for the first time. This study capitalizes on the unique SERS effects of gold nanoparticles coupled with the redox interaction between hydrogen and crystal violet, allowing for the development of a magnetic SERS probe that demonstrated enhanced sensitivity and specificity. This new probe can detect hydrogen concentrations as low as 1% by volume in gaseous environments, offering a substantial improvement over the detection limits of traditional hydrogen alarms. Further, this report comprehensively detailed the synthesis of the FA-CV materials, instrumental analysis, and an in-depth evaluation of the SERS performance of the FA-CV substrate, underlining the outstanding sensitivity, stability, and recyclability of the probe. The introduction of SERS in this novel capacity not only contributes a valuable approach to gas sensing technologies, but also suggests promising avenues for the application of SERS in environmental monitoring and energy security. This illustrates the adaptability and potential impact of this powerful technique.
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-10
·
IF 5.3
Liao Song,Gui Liuyang,Yang Yufan,Liu Yiwei,Hu Xiaopeng
A dual-mode fluorescence/visual aptasensor was developed for straightforward and accurate determination of aflatoxin B1 (AFB1) based on an Au/metal–organic framework (Au/MOF) composite. Aptamer-modified Au/Fe 3 O 4 (Apt/Au/Fe 3 O 4 ) served as the recognition element, and Au/MOF modified with complementary chains and 3,3′,5,5′-tetramethylbenzidine (cDNA/TMB/Au/MOF) acted as the fluorescence and visual probes. These components are integrated to form conjugates (Apt/Au/Fe 3 O 4 -cDNA/TMB/Au/MOF). Upon the introduction of AFB1, some cDNA/TMB/Au/MOF dissociated from Apt/Au/Fe 3 O 4 , enabling the use of detached probes for visual detection. The undecomposed conjugates were isolated magnetically for use in fluorescence detection. As the AFB1 concentration increases, the visual signal intensifies and fluorescence intensity diminishes. Thus, the proposed aptasensor achieves the simultaneous fluorescence and visual determination of AFB1, obviating the need for material and reagent substitutions. The detection limits were established at 0.07 ng mL −1 for the fluorescence mode and 0.08 ng mL −1 for the visual mode. The effectiveness of the aptasensor was further validated by quantifying AFB1 in real samples. Graphical Abstract
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