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学者姓名：许凯旋
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Abstract ：
The assemblies of plasmonic nanoparticles (NPs) are the universal methods for enhancing their surface-enhanced Raman scattering (SERS) activities. However, the present methods suffer from the problems of poor reproducibility, complicated fabrication, or the adsorption of ligands on the surface, which limit their practical applications. In this work, by using a facile freeze-thaw method, we are able to fabricate the assemblies of Ag NPs with highly reproducible SERS activity without the use of ligands. Moreover, the Ag NPs can be well kept in a frozen state for a long time with few influences on the reproducibility (relative standard deviation, RSD ca. 7%), while those kept in colloid (4 degrees C) suffer from gradual surface oxidation and aggregation. Such a simple freeze-thaw method does not require the introduction of any ligands (or linkers) with long-term stability and reproducibility, implying its wide applications in practical SERS sensing.
Keyword ：
Ag nanoparticles Ag nanoparticles freeze-thaw freeze-thaw high reproducibility high reproducibility nanoassembly nanoassembly surface-enhanced Raman scattering surface-enhanced Raman scattering
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| GB/T 7714 | Xu, Kai-Xuan , Chen, Xing , Huang, Zongxiong et al. Ligand-Free Fabrication of Ag Nanoassemblies for Highly Sensitive and Reproducible Surface-Enhanced Raman Scattering Sensing of Antibiotics [J]. | ACS APPLIED MATERIALS & INTERFACES , 2021 , 13 (1) : 1766-1772 . |
| MLA | Xu, Kai-Xuan et al. "Ligand-Free Fabrication of Ag Nanoassemblies for Highly Sensitive and Reproducible Surface-Enhanced Raman Scattering Sensing of Antibiotics" . | ACS APPLIED MATERIALS & INTERFACES 13 . 1 (2021) : 1766-1772 . |
| APA | Xu, Kai-Xuan , Chen, Xing , Huang, Zongxiong , Chen, Zhen-Ni , Chen, Junyan , Sun, Jian-Jun et al. Ligand-Free Fabrication of Ag Nanoassemblies for Highly Sensitive and Reproducible Surface-Enhanced Raman Scattering Sensing of Antibiotics . | ACS APPLIED MATERIALS & INTERFACES , 2021 , 13 (1) , 1766-1772 . |
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A highly sensitive and rapid method of in-situ surface-enhanced Raman spectroscopy (SERS) combining with electrochemical preconcentration (EP) in detecting malachite green (MG) in aquaculture water was established. Ag nanoparticles (AgNPs) were synthesized and spread onto the surface of gold electrodes after centrifuging to produce SERS-active substrates. After optimizing the pH values, preconcentration potentials and times, in-situ EP-SERS detection was carried out. A sensitive and rapid analysis of the low-concentration MG was accomplished within 200 s and the limit of detection was 2.4 x 10(-16) M.
Keyword ：
Aquaculture water Aquaculture water Electrochemical preconcentration (EP) Electrochemical preconcentration (EP) Malachite green Malachite green Surface-enhanced Raman spectroscopy (SERS) Surface-enhanced Raman spectroscopy (SERS)
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| GB/T 7714 | Xu, Kai-Xuan , Guo, Mei-Hong , Huang, Yu-Ping et al. Rapid and sensitive detection of malachite 'green in aquaculture water by electrochemical preconcentration and surface-enhanced Raman scattering [J]. | TALANTA , 2018 , 180 : 383-388 . |
| MLA | Xu, Kai-Xuan et al. "Rapid and sensitive detection of malachite 'green in aquaculture water by electrochemical preconcentration and surface-enhanced Raman scattering" . | TALANTA 180 (2018) : 383-388 . |
| APA | Xu, Kai-Xuan , Guo, Mei-Hong , Huang, Yu-Ping , Li, Xiao-Dong , Sun, Jian-Jun . Rapid and sensitive detection of malachite 'green in aquaculture water by electrochemical preconcentration and surface-enhanced Raman scattering . | TALANTA , 2018 , 180 , 383-388 . |
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Dicyandiamide (DICY) is a common ligand that exhibits low toxicity but can irritate the skin and eyes and cause methemoglobinemia on long-term exposure. Crystalline Cu-dicyandiamide (Cu-DICY) was obtained via facile synthesis and its molecular structure and theoretical Raman spectra were simulated by using density functional theory (DFT). The results suggested that the Cu2+ coordinates with two H2O molecules and two different DICY molecules (an imino DICY and an amino DICY). The stability constants of Cu-DICY were calculated, and the electrochemical properties were studied. Two electro-chemical redox processes occur in Cu-DICY in an aqueous solution: a reversible reaction with a formal potential of 0.2 V vs. MSE and an irreversible reaction between -0.4 and -1.2 V vs. MSE. The standard rate constant k (0) for the reversible reaction was estimated to be 7.6x10(-3) cm/s. In addition, based on the reversible reaction of Cu-DICY, square wave voltammetry was used to rapidly determine the concentration of Cu(II) and the detection limit was 66.7 mu g/L, which satisfies the detection limit requirements for copper in tap water (2 mg/L) as provided by the World Health Organization.
Keyword ：
Cu-dicyandiamide Cu-dicyandiamide density functional theory density functional theory Raman spectra Raman spectra square wave voltammetry square wave voltammetry
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| GB/T 7714 | Xu, Kai-Xuan , Guo, Mei-Hong , Ren, Ling-Qing et al. Spectroscopic and electrochemical properties of Cu-dicyandiamide complex [J]. | SCIENCE CHINA-CHEMISTRY , 2018 , 61 (3) : 360-367 . |
| MLA | Xu, Kai-Xuan et al. "Spectroscopic and electrochemical properties of Cu-dicyandiamide complex" . | SCIENCE CHINA-CHEMISTRY 61 . 3 (2018) : 360-367 . |
| APA | Xu, Kai-Xuan , Guo, Mei-Hong , Ren, Ling-Qing , Huang, Wei , Sun, Jian-Jun . Spectroscopic and electrochemical properties of Cu-dicyandiamide complex . | SCIENCE CHINA-CHEMISTRY , 2018 , 61 (3) , 360-367 . |
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In this work, CE-LIF was employed to investigate the amino acid metabolites produced by Escherichia coli (E. coli) in microbial fuel cell (MFC). Two peptides, L-carnosine and L-alanyl-glycine, together with six amino acids, cystine, alanine, lysine, methionine, tyrosine, arginine were separated and detected in advance by a CE-LIF system coupled with a homemade spontaneous injection device. The injection device was devised to alleviate the effect of electrical discrimination for analytes during sample injection. All analytes could be completely separated within 8 min with detection limits of 20-300 nmol/L. Then this method was applied to analyze the substrate solution containing amino acid metabolites produced by E. coli. L-carnosine, L-alanyl-glycine, and cystine were used as the carbon, nitrogen, and sulfur source for the E. coli culture in the MFC to investigate the amino acid metabolites during metabolism. Two MFCs were used to compare the activity of metabolism of the bacteria. In the sample collected at the running time 200 h of MFC, the amino acid methionine was discovered as the metabolite with the concentrations 23.3 mu g/L.
Keyword ：
Capillary electrophoresis Capillary electrophoresis Escherichia coli Escherichia coli Laser-induced fluorescence Laser-induced fluorescence Metabolites Metabolites
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| GB/T 7714 | Wang, Wei , Ma, Lihong , Lin, Ping et al. Separation and detection of amino acid metabolites of Escherichia coli in microbial fuel cell with CE [J]. | ELECTROPHORESIS , 2016 , 37 (14) : 2106-2111 . |
| MLA | Wang, Wei et al. "Separation and detection of amino acid metabolites of Escherichia coli in microbial fuel cell with CE" . | ELECTROPHORESIS 37 . 14 (2016) : 2106-2111 . |
| APA | Wang, Wei , Ma, Lihong , Lin, Ping , Xu, Kaixuan . Separation and detection of amino acid metabolites of Escherichia coli in microbial fuel cell with CE . | ELECTROPHORESIS , 2016 , 37 (14) , 2106-2111 . |
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Abstract ：
Flavonoids are important active ingredients in many traditional Chinese medicines. In this paper, capillary electrophoresis with amperometric detection was employed to separate and detect eight flavonoids, rutin, quercetrin, quercetin, kaempferol, kaempferide, catechin, apigenin, and luteolin, in a home-made capillary electrophoresis device. Under the separation voltage of 2000 V, the eight flavonoids could be completely separated within 33 min in 18 mM borax running buffer at pH 10.2. Good linear relationships were obtained for all analytes and the detection limits for flavonoids ranged from 0.46 to 0.85 mu M. Then, the method was applied to separate and determine the flavonoids in three traditional Chinese medicines, hippophae rhamnoides, hypericum perforatum, and cacumen platycladi. Finally, rutin, kaempferol, quercetin, and quercetrin were discovered in these medicines and the concentrations ranged from 0.28 to 9.94 mg/g. The recoveries of flavonoids ranged from 84.7 to 113%, which showed the high reliability of this method.
Keyword ：
Amperometric detection Amperometric detection Capillary electrophoresis Capillary electrophoresis Flavonoids Flavonoids Traditional Chinese medicine Traditional Chinese medicine
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| GB/T 7714 | Wang, Wei , Lin, Ping , Ma, Lihong et al. Separation and determination of flavonoids in three traditional chinese medicines by capillary electrophoresis with amperometric detection [J]. | JOURNAL OF SEPARATION SCIENCE , 2016 , 39 (7) : 1357-1362 . |
| MLA | Wang, Wei et al. "Separation and determination of flavonoids in three traditional chinese medicines by capillary electrophoresis with amperometric detection" . | JOURNAL OF SEPARATION SCIENCE 39 . 7 (2016) : 1357-1362 . |
| APA | Wang, Wei , Lin, Ping , Ma, Lihong , Xu, Kaixuan , Lin, Xiuli . Separation and determination of flavonoids in three traditional chinese medicines by capillary electrophoresis with amperometric detection . | JOURNAL OF SEPARATION SCIENCE , 2016 , 39 (7) , 1357-1362 . |
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Alternate hot and cold electrodes, actively heated and chilled, were facilely fabricated for the first time. It consists of two symmetrically placed semiconductor thermoelectric coolers and an embedded interlayer with a Pt-PtRh thermocouple. The tip of Pt-PtRh thermocouple can be used as both an electrochemical electrode and a temperature-sensing device simultaneously. Theoretical simulation shows that a local steady-state supercooled water within a radius of ca. 12.6 mm around the electrode can be obtained. In this paper, the activity of horseradish peroxidase is evidenced at supercooled temperature (-9 degrees C) in 0.1 M PBS. (C) 2015 Elsevier B.V. All rights reserved.
Keyword ：
Alternate hot and cold electrode Alternate hot and cold electrode Bioactivity Bioactivity Horseradish peroxidase Horseradish peroxidase Supercooled electrode Supercooled electrode Supercooled environment Supercooled environment
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| GB/T 7714 | Huang, Zong-Xiong , Yang, Sen , Yao, Fen-Zeng et al. Alternate hot and cold electrodes [J]. | ELECTROCHEMISTRY COMMUNICATIONS , 2015 , 61 : 129-133 . |
| MLA | Huang, Zong-Xiong et al. "Alternate hot and cold electrodes" . | ELECTROCHEMISTRY COMMUNICATIONS 61 (2015) : 129-133 . |
| APA | Huang, Zong-Xiong , Yang, Sen , Yao, Fen-Zeng , Xu, Kai-Xuan , Zhang, Ji-Fang , Wu, Shao-Hua et al. Alternate hot and cold electrodes . | ELECTROCHEMISTRY COMMUNICATIONS , 2015 , 61 , 129-133 . |
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A high-speed separation method of capillary MEKC with LIF detection had been developed for separation and determination of amino acids in laver. The CE system comprised a manual slotted-vial array (SVA) for sample introduction that could improve the separation efficiency by reducing injection volume. Using a capillary with 80 mm effective separation length, the separation conditions for amino acids were optimized. Applied with the separation electric field strength of 300 V/cm, the ten amino acids could be completely separated within 2.5 min with 10 mol/L Na2HPO4-NaOH buffer (pH = 11.5) including 30 mmol/L SDS. Theoretical plates for amino acids ranged from 72 000 to 40 000 (corresponding to 1.1-2.0 mu m plate heights) and the detection limits were between 25 and 80 nmol/L. Finally, this method was applied to analyze the composition of amino acids in laver and eight known amino acids could be found in the sample. The contents of five amino acids, tyrosine, glutamic acid, glycine, lysine, and aspartic acid that could be completely separated in real sample were determined. The recoveries ranged from 82.3% to 123% that indicated the good reliability for this method in laver sample analysis.
Keyword ：
Amino acid Amino acid High speed capillary electrophoresis High speed capillary electrophoresis Laser-induced fluorescence Laser-induced fluorescence Laver Laver
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| GB/T 7714 | Wang, Wei , Ma, Lihong , Yao, Fenzeng et al. High-speed separation and detection of amino acids in laver using a short capillary electrophoresis system [J]. | ELECTROPHORESIS , 2015 , 36 (2) : 335-340 . |
| MLA | Wang, Wei et al. "High-speed separation and detection of amino acids in laver using a short capillary electrophoresis system" . | ELECTROPHORESIS 36 . 2 (2015) : 335-340 . |
| APA | Wang, Wei , Ma, Lihong , Yao, Fenzeng , Lin, Xiuli , Xu, Kaixuan . High-speed separation and detection of amino acids in laver using a short capillary electrophoresis system . | ELECTROPHORESIS , 2015 , 36 (2) , 335-340 . |
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We previously introduced a novel Au-Fe/Ni alloy nanomotor that could move with a speed of up to 850 mu ms(-1) in a mixed fuel (H2O2 and N2H4) environment. However, the propulsion mechanism and the role of hydrazine were not fully elucidated. To this end, Tafel plots, linear sweep voltammetry (LSV) and oxygen sensing were employed and integrated to explore hydrazine's function and explain the locomotive behaviour of Au-Fe/Ni nanomotors. It was found that the speed of Au-Fe/Ni nanomotors was not positively correlated with the mixed potential difference between the composite metal pair, which had not been found in similar self-electrophoresis propelled nanomotors. Moreover, the results showed that the oxidation of H2O2 can also be facilitated by hydrazine in mixed fuels, resulting in oxygen bubbles propelling Au-Fe/Ni nanomotors forward.
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| GB/T 7714 | Xiao, Qing , Li, Ju , Han, Jing et al. The role of hydrazine in mixed fuels (H2O2/N2H4) for Au-Fe/Ni nanomotors [J]. | RSC ADVANCES , 2015 , 5 (87) : 71139-71143 . |
| MLA | Xiao, Qing et al. "The role of hydrazine in mixed fuels (H2O2/N2H4) for Au-Fe/Ni nanomotors" . | RSC ADVANCES 5 . 87 (2015) : 71139-71143 . |
| APA | Xiao, Qing , Li, Ju , Han, Jing , Xu, Kai-Xuan , Huang, Zong-Xiong , Hu, Juan et al. The role of hydrazine in mixed fuels (H2O2/N2H4) for Au-Fe/Ni nanomotors . | RSC ADVANCES , 2015 , 5 (87) , 71139-71143 . |
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Keyword ：
溶液电化学 溶液电化学 超冷水 超冷水
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| GB/T 7714 | 孙建军 , 黄宗雄 , 杨森 et al. 超冷水溶液电化学研究进展 [C] //中国化学会第十二届全国分析化学年会论文集 . 2015 : 286-286 . |
| MLA | 孙建军 et al. "超冷水溶液电化学研究进展" 中国化学会第十二届全国分析化学年会论文集 . (2015) : 286-286 . |
| APA | 孙建军 , 黄宗雄 , 杨森 , 吴韶华 , 许凯旋 . 超冷水溶液电化学研究进展 中国化学会第十二届全国分析化学年会论文集 . (2015) : 286-286 . |
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冷环境 冷环境 辣根 辣根
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| GB/T 7714 | 黄宗雄 , 杨森 , 汤忧 et al. 超冷环境下辣根过氧化物酶活性 [C] //中国化学会第十二届全国分析化学年会论文集 . 2015 : 1655-1655 . |
| MLA | 黄宗雄 et al. "超冷环境下辣根过氧化物酶活性" 中国化学会第十二届全国分析化学年会论文集 . (2015) : 1655-1655 . |
| APA | 黄宗雄 , 杨森 , 汤忧 , 许凯旋 , 吴韶华 , 孙建军 . 超冷环境下辣根过氧化物酶活性 中国化学会第十二届全国分析化学年会论文集 . (2015) : 1655-1655 . |
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