SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Jinyu Huang,Hao Liang,Jiexiong Ye,Dongting Jiang,Yiling Sun,Xuejin Li,Youfu Geng,Jiaqi Wang,Zhengfang Qian,Yu Du
Au-loaded ZnO were successfully prepared by means of seed-assisted solvothermal methods. The vertically ordered nanorod arrays are uniformly grown on the Al 2 O 3 substrate. The sensing properties of ZnO and Au-loaded ZnO sensors toward HCHO were investigated. Remarkably, the sensor based on 4 wt%Au-loaded ZnO nanorod arrays exhibits high response, short response and recover times, excellent selectivity, as well as low HCHO detection limit at 70 °C. After the incorporation of Au nanoparticle, the detection limit decreases from 10 ppm to 0.25 ppm, and the response increases more than 20 times under 100 ppm HCHO at 70 °C. Moreover, the mechanism of HCHO sensing with Au-loaded ZnO was explored by the calculations obtained from the first-principle studies.
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ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Muhammad Usman Amin,Ruiyuan Zhang,Lingwei Li,Hongjun You,Jixiang Fang
To achieve ultrasensitive detection of trace targets through solution-based surface-enhanced Raman spectroscopy (SERS), direct adsorption of the target molecules on a SERS-active surface is vital. In this work, cetyltrimethylammonium bromide (CTAB)-capped gold nano-bipyramids (Au BPs) with different aspect ratios (ARs) are prepared and the surface is successfully modified by a simple ligand exchange method. Cysteamine-capped gold nano-bipyramids (cyst-Au BPs) are obtained by means of replacement of CTAB by cysteamine using Au–S covalent bonding and applied in the solution-based SERS detection of different pigment molecules, which always have weak affinity to the gold surface. The hydrogen bonding between the pigment molecule and cysteamine causes the aggregation of Au BPs to generate local electromagnetic field enhancement. The influence of the AR and concentration of Au BPs on SERS properties is investigated. The SERS detection of weak-affinity molecules to an extremely low limit shows that the cyst-Au BPs are highly sensitive compared to CTAB-capped Au BPs. The limit of detection (LOD) of allura red as low as 0.1 ppb and that of sunset yellow as low as 1 ppb show that the proposed strategy has many advantages due to its simplicity and fast and rapid detection for the sensitivity analysis of weak-affinity molecules.
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高影响因子
ELECTROANALYSIS
·
2021
·Vol. 33
·期 7
·1736-1745
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IF 3.223
Huanan Guan,Bo Peng,Dezhuang Gong,Bolin Han,Na Zhang
Fe 3 O 4 @Au nanomaterials were prepared by the self-assembly method. An enzyme-free, ultrasensitive electrochemical detection of uric acid was achieved based on the peroxidase-like activity of Fe 3 O 4 @Au. The proposed procedure has exhibited excellent catalytic activities and achieved significant enhancements of the current responses to uric acid. The detection range was from 0.1 to 10 mmol/L, and the limit of detection was 0.087 μmol/L. Under the action of external magnetic field, the magnetic particles can be easily separated from the bottom liquid, which has the advantages of simple operation and high separation efficiency. Moreover, this detection method combining a simulated enzyme and electrochemical can enhance the effective output of the overall electrochemical signal without modifying the electrode, and excellent reproducibility can be achieved. Compared to colorimetric assay, the electrochemical one has higher sensitivity and selectivity, and was further applied in ultrasensitive detection of uric acid in food samples. In short, the proposed electrochemical assay has great potential in the fields of food quality control and biomedical analysis.
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CARBON
·
2021
·
IF 9.594
Junwei Liang,Yuxiang Liu,Zhichun Si,Guodan Wei,Duan Weng,Feiyu Kang
Utilizing photocatalysts to split water into H 2 and H 2 O 2 simultaneously is an ideal but challenging process to obtain clean H 2 energy and high valuable H 2 O 2 . Most of the photocatalysts currently studied for the overall water splitting are converting water into H 2 and O 2 , resulting in further need of gas separation. Here, we reported a photocatalyst which can utilize the nano-Au based localized surface plasmonic resonance (LSPR) effect to produce H 2 and H 2 O 2 simultaneously. Nitrogen doped graphene quantum dots (N-GQDs) pieced together into large graphene through a catalytic process by chloroauric acid, in which dodecahedron nano-Au particles can also be obtained concurrently. Then Au wrapped up by graphene can be in situ formed with good interfaces. Photocatalytic activity tests revealed that the as prepared graphene@Au catalysts show efficient photocatalytic overall water splitting activity with a H 2 evolution rate of 65.6 μmol g −1 h −1 and H 2 O 2 generation rate of 49.7 μmol g −1 h −1 . This work provides a feasible route for the facile fabrication of graphene through the bottom-up polycondensation of N-GQDs by amide bonds and new insights into the synthesis of photocatalysts for overall water splitting into H 2 and H 2 O 2 .
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 27
·2101255
·
IF 18.808
Henglei Jia,Yuanyuan Yang,Tsz Him Chow,Han Zhang,Xiyue Liu,Jianfang Wang,Chun-yang Zhang
Symmetry-breaking synthesis of colloidal nanocrystals with desired structures and properties has aroused widespread interest in various fields, but the lack of robust synthetic protocols and the complex growth kinetics limit their practical applications. Herein, a general strategy is developed to synthesize the Au–Cu Janus nanocrystals (JNCs) through the site-selective growth of Cu nanodomains on Au nanocrystals, which is directed by the substantial lattice mismatch between them, with the assistance of judicious manipulation of the growth kinetics. This strategy can work on Au nanocrystals with different architectures for the achievement of diverse asymmetric Au–Cu hybrid nanostructures. Of particular note, the obtained Au nanobipyramids (Au NBPs)-based JNCs facilitate the conversion of CO 2 to C 2 hydrocarbon production during electrocatalysis, with the Faradaic efficiency and maximum partial current density being 4.1-fold and 6.4-fold higher than those of their monometallic Cu counterparts, respectively. The excellent electrocatalytic performances benefit from the special design of the Au–Cu Janus architectures and their tandem catalysis mechanism as well as the high-index facets on Au nanocrystals. This research provides a new approach to synthesize various hybrid Janus nanostructures, facilitating the study of structure-function relationship in the catalytic process and the rational design of efficient heterogeneous electrocatalysts.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 10
·1-12
·
IF 2.132
Niu Zhiqiang,Liu Hongmei,Chen Ying,Gu Chenjie,Zhao Ziqi,Jiang Tao
Surface-enhanced Raman scattering (SERS) has been considered a high sensitivity, specificity, and ultra-fast analytical technique in molecular fingerprint recognition. Herein, a kind of sandwich Au/“star-like” mesoporous SiO 2 /Ag (Au/MSiO 2 /Ag) hybrid nanostructure was developed by implementing the electrostatic adsorption and magnetron sputtering technology for SERS application. In the experiment, the decoration density of the MSiO 2 /Ag nanostructure was conveniently adjusted through tuning the washing times of the silicon wafer in ethanol. The prepared substrate with the optimal geometry structure exhibited an enhancement factor (EF) of 9.2 × 10 5 , a limit of detection (LOD) of 5 × 10 −5 M, and a low relative standard deviation value of 5.02%. In the end, the obtained hybrid SERS substrate was used to detect nitrofurazone and an excellent LOD of 1 ppm was achieved. Overall, our novel sandwich Au/MSiO 2 /Ag hybrid SERS substrate provides a rapid and accurate way of monitoring ultra-low trace antibiotics, which can significantly promote food safety.
Graphical abstract
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-8
·
IF 5.833
Zhang Bing,Hu Xing,Jia Yejing,Li Jing,Zhao Zhihuan
A photothermal immunoassay using a thermometer as readout based on polyaniline@Au organic-inorganic nanohybrids was built. Temperature output is acquired due to the photothermal effect of the photothermal nanomaterial. Polyaniline@Au organic-inorganic nanohybrids were synthesized by interfacial reactions with high photothermal conversion efficiency. A sandwich structure of the immunocomplex was prepared on a microplate for determination of carcinoembryonic antigen (CEA) by polyaniline@Au organic-inorganic nanohybrids as nanolabel. The released heat based on light-to-heat conversion from the photothermal nanolabel under NIR irradiation is detectable using the thermometer. The increased temperature is directly proportional to CEA concentration. The linear range of the photothermal immunoassay is 0.20 to 25 ng mL −1 with determination limit of 0.17 ng mL −1 . Graphical abstract
Polyaniline@Au organic-inorganic nanohybrids with high photothermal conversion efficiency was synthesized as labels to construct photothermal immunosensor. The sandwich-type immunoassay was built on 96 hole plate based on specific binding of antigen and antibody. Carcinoembryonic antigen in sample was detected quantitatively by thermometer readout.
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PubMed
高影响因子
TALANTA
·
2021
·
IF 6.057
Jing Li,Dali Liu,Donglei Zhou,Long Shao,Xu Chen,Hongwei Song
In this work, a novel label-free photoelectrochemical (PEC) biosensor based on Au/Cs x WO 3 heterogeneous films with low background noise and excellent sensitive detection of alpha-fetoprotein (AFP) was proposed. We prepared Au/Cs x WO 3 heterogeneous films by different methods including template removal and spin coating . The surface plasmon resonances (SPR) of Au film and Cs x WO 3 semiconductor nanocrystals largely improved the photoelectrochemical properties of the electrodes and enhanced the photocurrent . Under the optimal conditions, the prepared PEC biosensor showed a linear response between photocurrent variation and the logarithm of AFP concentration in the range from 0.01 ng/mL to 500 ng/mL with a low detection limit of 7 pg/mL. In addition, the proposed PEC biosensor had excellent specificity, repeatability, long-term stability and showed satisfactory results in the analysis of human serum samples, which would have great prospect in clinical application and biological analysis in the future.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yechen Wang,Yaru Wang,Jianjun Zhao,Min Chen,Xubo Huang,Yiming Xu
Production of H 2 O 2 via a more economic, green and safe way is challenging. In this work, we report an efficient production of H 2 O 2 from oxygen reduction reaction (ORR) in aqueous solution over a modified WO 3 with Au nanoparticles . Under visible light at wavelengths longer than 420 nm for 5 h, H 2 O 2 measured from WO 3 and Au/WO 3 were 1.07, and 177 μM, respectively. On addition of methanol, H 2 O 2 obtained from WO 3 , Au/WO 3 , and Au/SiO 2 were 8.55, 544, and 0.36 μM, respectively. Photoluminescence and electrochemical measurement revealed that there was an interfacial electron transfer from the excited WO 3 to Au, followed by two-electron reduction of O 2 on Au sites. Under visible light at wavelengths longer than 535 nm, interestingly, H 2 O 2 was also produced from Au/WO 3 (39 μM at 5 h), while the photocurrent of water oxidation on Au/WO 3 was much larger than those on Au/SiO 2 and WO 3 . Clearly, there is also an interfacial electron transfer from the plasmonic Au to WO 3 , followed by ORR to H 2 O 2 , but such a process fails when WO 3 is excited. However, the production of H 2 O 2 on Au/WO 3 was determined by several factors, including Au content, light absorption, and particle size. A maximum H 2 O 2 was observed at an initial pH 3.0 from 0.35 wt% Au/WO 3 , prepared at 400 °C. Moreover, at the same loading on WO 3 , Au was more efficient than Pd, Ag, Pt, Ni, Cu, and Co, while at the same Au loading, WO 3 was more efficient than BiVO 4 and Bi 2 WO 6 . The superior performance of Au/WO 3 is mainly due to its ability to undergo selective ORR to H 2 O 2 , and to release protons into aqueous solution protecting H 2 O 2 from decomposition.
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Nature Catalysis
·
2020
·Vol. 3
·期 4
·411-417
·
IF 30.471
Zhang Xiaoben,Han Shaobo,Zhu Beien,Zhang Guanghui,Li Xiaoyan,Gao Yi,Wu Zhaoxuan,Yang Bing,Liu Yuefeng,Baaziz Walid,Ersen Ovidiu,Gu Meng,Miller Jeffrey T.,Liu Wei
The high catalytic performance of core–shell nanoparticles is usually attributed to their distinct geometric and electronic structures. Here we reveal a dynamic mechanism that overturns this conventional understanding by a direct environmental transmission electron microscopy visualization coupled with multiple state-of-the-art in situ techniques, which include synchrotron X-ray absorption spectroscopy, infrared spectroscopy and theoretical simulations. A Ni–Au catalytic system, which exhibits a highly selective CO production in CO 2 hydrogenation, features an intact ultrathin Au shell over the Ni core before and after the reaction. However, the catalytic performance could not be attributed to the Au shell surface, but rather to the formation of a transient reconstructed alloy surface, promoted by CO adsorption during the reaction. The discovery of such a reversible transformation urges us to reconsider the reaction mechanism beyond the stationary model, and may have important implications not only for core–shell nanoparticles, but also for other well-defined nanocatalysts.
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ACS Catalysis
·
2020
·
IF 12.35
Ji-Xiao Zhao,Chao-Qiu Chen,Cai-Hong Xing,Zhi-Feng Jiao,Meng-Ting Yu,Bing-Bao Mei,Jie Yang,Bai-Yan Zhang,Zheng Jiang,Yong Qin
Precise control of selectivity in hydrogenation reactions is a long-standing challenge. Surface decoration of nanocatalysts with transition-metal oxide nanoparticles (NPs) is an effective strategy to tailor the catalytic selectivity but generally at the expense of activity due to the blocking of active sites. Here, we report that constructing single-site metal oxide modifiers (NiO, CoOx, or FeOx) on supported Au NPs by atomic layer deposition (ALD) can regulate their catalytic selectivity for nitroaromatic hydrogenation. The coverage of single-site metal oxide can be precisely tuned by altering the number of ALD cycles. The Au/TiO2 decorated with five cycles of NiO (Ni: 0.32 wt %) in the style of a single site can efficiently change the product selectivity from azo to azoxy compounds without significantly blocking the surface active sites. The density functional theory calculations indicate that the azoxybenzene bonded to the single-site NiO-decorated Au(111) with a larger adsorption energy, which inhibits the overhydrogenation of azoxybenzene and results in high azoxybenzene selectivity. Our work has demonstrated a general and efficient way to regulate the reaction selectivity of metal nanocatalysts by anchoring single-site metal oxide promoters.
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CATALYSIS TODAY
·
2020
·
IF 5.825
Lijie Zhang,Mei Li,Shengbo Zhang,Xuerui Cao,Jinxiao Bo,Xinli Zhu,Jinyu Han,Qingfeng Ge,Hua Wang
Electrochemical CO 2 reduction (CO 2 RR) to ethanol is a way to advance CO 2 utilization toward a renewable chemical feedstock and fuel. In present study, an approach to promote ethanol production is employed through adding Au, which is favorable toward CO formation, onto Cu 2 O catalysts. Namely, the Cu 2 O hollow nanospheres with a size of 150−180 nm were synthesized by a soft template method, and then Au nanoparticles of ∼7 nm were loaded to obtain Au x /Cu 2 O composites. The Au x /Cu 2 O catalysts have an earlier onset for ethanol production than Cu 2 O. Besides, Au x /Cu 2 O catalysts display the significantly enhanced Faraday efficiencies (FEs) of CO and ethanol, the suppressed hydrogen evolution reaction and the slightly weakened HCOOH formation. Among them, Au 0.17 /Cu 2 O stands out with the highest FEs of ethanol from 10.8%–16.2% throughout the measuring potentials, suggesting an optimal amount of Au. Furthermore, it is found that the FEs of ethanol increase as the atomic ratio of Au/Cu increases at the medium reduction potentials (-1.1 V to -1.3 V). Besides, it is demonstrated that ethanol formation is more favorable over ethylene formation, evidenced by the ratio of FE ethanol /FE ethylene reaching 2.0, 3.3, 4.1 on three Au x /Cu 2 O catalysts, respectively. This correlation between the ethanol production and the Au amount reflects that Au plays a crucial role in promoting ethanol formation. The enhanced ethanol formation is ascribed to more CO formation on Au sites to promote C–C coupling. Our study demonstrates an effective approach to develop Cu-based electrocatalysts for ethanol formation from CO 2 .
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