JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
·
IF 3.012
Yangping Wen,Juan Chang,Lanjiao Xu,Xiaoning Liao,Ling Bai,Yingdong Lan,Mingfang Li
Abnormal level of purines , especially uric acid (UA), xanthine (XA) and hypoxanthine (HX) in organisms is an important marker for early diagnosis of animal (human) disease. In this paper, an simultaneous analysis of UA, XA and HX in biological samples was successfully realized using the fabricated voltammetric sensor based on the nanocomposite of both nano-rod clay mineral palygorskite (Pal) and two-dimensional nano-layered nitrogen doped graphene (NG). A water-soluble carboxymethyl cellulose (CMC) salt was simultaneously decorated both Pal and NG to improve the water dispersibility, and their nanocomposite was characterized. Under optimized conditions, The as-prepared nanocomposite electrode (CMC-Pal-NG/GCE) could realize their simultaneous voltammetric analysis in linear ranges from 0.5 to 60 μM for UA, 0.2 to 20 μM for XA, and 0.6 to 55 μM for HX. The limit of detection of three purines (UA,XA and HX) is calculated to be 0.1 for UA, 0.05 for XA and 0.4 μM for HX, and their possible detailed mechanisms for electro-catalytic oxidation and chemical reaction was discussed, which was successfully empolyed for simultaneous voltammetric analysis of three purines in real samples with good reproducibility, repeatability and stability. Satisfactory results indicated that the obtained nanocomposite will provide a promising candidate for the simultaneous electrochemical determination of UA, XA and HX in analysis of practical samples.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Fengyu Xie,Tingting Liu,Lisi Xie,Xuping Sun,Yonglan Luo
It is significantly important to design enzyme-free electrocatalyst for sensitive and selective detection of glucose (Glu). In this paper, we report that metallic nickel nitride nanosheet on Ti mesh (Ni 3 N NS/Ti) behaves as an efficient three-dimensional catalyst electrode for Glu electro-oxidation under alkaline conditions. We further demonstrate the use of such Ni 3 N NS/Ti as a non-enzymatic electrochemical Glu sensor superior in analytical performances. The introduction of the Ni 3 N NS/Ti can provide a high surface area and lead to high sensitivity to Glu. This sensor shows a fast amperometric response toward Glu and can achieve steady state current density within 5 s, a detection range of 0.2 μM–1.5 mM, a detection limit of 0.06 μM (S/N = 3), a response sensitivity of 7688 μA mM −1 cm −2 , and satisfactory selectivity and reproducibility. In addition, it also works effectively for Glu detection in human blood serum, promising its application toward determination of Glu in real samples.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Hao Lin Zou,Bang Lin Li,Hong Qun Luo,Nian Bing Li
Recently, hybrids of layered MoS 2 are highly encouraged to handle the puzzles, taken by the weakness of two-dimensional (2D) transition metal dichalcogenides (TMDC), including low conductivity and lack of active edge sites. Considering the merits of zero-dimensional (0D) nanomaterials, the emerging heterostructures based on 0D Au nanoparticles and 2D MoS 2 nanosheets (MoS 2 -NSs) are successfully obtained via a spontaneously reduced process with the addition of HAuCl 4 in exfoliated MoS 2 -NSs aqueous dispersions. Significantly, with the combination of high conductivity rate and large active surface, the synthetic effect results in a diversity of improved properties of 0D-2D heterostructures, not only exhibiting improved stability, but also remarkably enhancing the selectivity and sensitivity for electrochemically simultaneous detections of dopamine, ascorbic acid, uric acid, and nitrite. Our current achievements of 0D-2D heterostructures contribute fresh ideas to the overall development of more advanced future TMDC based sensors.
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高影响因子
MICROCHIMICA ACTA
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2017
·Vol. 184
·期 7
·2411-2418
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IF 4.58
Wang Jiasheng,Hui Ni
A glassy carbon electrode (GCE) was modified with graphene oxide-doped polypyrrole (PPy), and flower-like cobalt nanostructures were then deposited on GCE by electrochemical reduction. The modified electrode shows improved catalytic behavior towards nitrite oxidation as the result of the nanoporous structure and the synergistic effect between cobalt nanostructures and GO/PPy. It is found that the amperometric oxidation current at 0.80 V (vs SCE) is about 2.5 times larger than that of a GCE modified with carbon nanotubes. Under optimum conditions, the modified electrode displays a linear range that extends over the 1.0 μM to 3.2 mM and 6.8 – 12 mM concentration ranges, a lower detection limit of 15 nM (at an S/N ratio of 3), and a response time of 1 s. The modified electrode is adequately selective, highly stable and highly reproducible. The method was successfully applied to the determination of nitrite in pickled radish.
A flower-like cobalt nanostructure was deposited, by electrochemical reduction, on a graphene oxide doped polypyrrole. The modified sensor showed notably improved catalytic behavior towards the nitrite oxidation as the result of the nanoporous structure and the synergistic effect.
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高影响因子
Nano Research
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2017
·Vol. 10
·期 7
·2482-2494
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IF 7.354
Cui Shiqiang,Li Li,Ding Yaping,Zhang Jiangjiang,Wu Qingsheng,Hu Zongqian
Uniform, ordered mesoporous ZnCo 2 O 4 (meso-ZnCo 2 O 4 ) nanospheres were successfully synthesized using a sacrificing template method. The meso-ZnCo 2 O 4 nanospheres were used for the first time for H 2 O 2 biosensing and in glucose biofuel cells (GBFCs) as an enzyme mimic. The meso-ZnCo 2 O 4 nanospheres not only exhibited excellent catalytic performance in the H 2 O 2 sensor, achieving a high sensitivity (658.92 μA·mM –1 ·cm –2 ) and low detection limit (0.3 nM at signal-to-noise ratio (S/N) = 3), but also performed as an excellent cathode material in GBFCs, resulting in an open circuit voltage of 0.83 V, maximum power density of 0.32 mW·cm –2 , and limiting current density of 1.32 mA·cm –2 . The preeminent catalytic abilities to H 2 O 2 and glucose may be associated with the large specific surface area of the mesoporous structure in addition to the intrinsic catalytic activity of ZnCo 2 O 4 . These significant findings provide a successful basis for developing methods for the supersensitive detection of H 2 O 2 and enriching catalytic materials for biofuel cells.
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高影响因子
TALANTA
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2016
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IF 4.035
Shiqiang Cui,Li Li,Yaping Ding,Jiangjiang Zhang,Hua Yang,Yingzi Wang
The glassy carbon electrode (GCE) modified with mesoporous NiCo 2 O 4 -decorated reduced graphene oxide (NiCo 2 O 4 /rGO) was first applied for the electrochemical determination of rutin . The synthesized NiCo 2 O 4 and NiCo 2 O 4 /rGO were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) method. The sensor not only showed a satisfactory linear range (0.1–150 μM) and detection limit (0.01 μM) but also exhibited the good anti-interference abilities, low price, high stability, as well as favorable precision and accuracy. The present work is meaningful to expand functionalized graphene composites to sensor fields and promote the development of rutin sensors.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 5
·2081-2089
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IF 3.269
Haifeng Zhou,Jie Chen,Tingting Huang,Dejian Chen,Yijin Wu,Fengying Zheng,Huiwu Yu,Shunxing Li
As a biomass-derived precursor, pork liver, with rich nitrogen, iron, and carbon, was calcined, metal organic ligands were carbonized, and a uniformly distributed and in situ iron–nitrogen co-doped porous carbon material (N/Fe–C) could be prepared by a facile, low-cost synthetic method. Using N/Fe–C as an electrochemical selective sensor, a biochemical analysis platform was proposed. The neurotransmitter dopamine (DA), the purine metabolite uric acid (UA), and the most extensively employed drug paracetamol (PA) could coexist in real biological samples and used as models of bioelectroactive molecules. Compared with glassy carbon electrode (GCE), GCE modified with nitrogen-doped carbon (C/N/GCE) and N–C/GCE (i.e., the iron in N/Fe–C/GCE removed with nitric acid), the redox performance of N/Fe–C/GCE was improved approximately 18-fold, 6-fold, and 2-fold, respectively. Furthermore, the peak overlap among DA, UA, and PA and the interference of ascorbic acid, H2O2 and glucose could be avoided. These improvements were attributed to the uniform distribution of N, C and Fe, electrocatalytic activity of iron, excellent electrical conductivity of graphite-like carbon, large surface area (665.1 m2 g−1), and outstanding, but different, redox ability for DA, UA, and PA. N/Fe–C/GCE was utilized for rapid (in 30 s) and simultaneous determination of DA, UA, and PA. The linear range and detection limit (3 S/N) were in the range of 0.5–320 μmol L−1 and 10.6–79.0 nmol L−1, respectively. This method was used for the analysis of human blood serum with satisfactory results. The electrode of N/Fe–C/GCE remained effective for at least two weeks.
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高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
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2017
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IF 4.396
Fengjin Qu,Xiaoyan Ma,Lin Zhu,Fang Chen
A new photoswitchable electrode triggered by a brief light signal was fabricated by depositing an azobenzene-containing copolymer on an indium tin oxide substrate decorated with gold nanoparticles . The polymer formed a compact, complete thin film on the electrode surface using the Langmuir–Schaefer technique and offered reversible and stable switching performance. The conductivity and hydrophilicity of the electrode changed under UV/visible light due to the photoisomerization of the azobenzene moieties in the polymer film, influencing electron transfer and mass transport at the electrode. The electrochemical characterization demonstrated that the electrode exhibited reversibly switchable electrochemical behavior. In its active state, the as-prepared electrode possessed efficient electrocatalytic capability towards uric acid oxidation with a maximum anodic current density of 0.97 mA·cm − 2 . The uric acid/air fuel cell assembled from the photo-triggered anode and a Pt/C-modified cathode operated with an open circuit voltage of 0.12 V and a maximum power density of 41.33 μW·cm − 2 . The cell exhibited reversible switching performance (four cycles) and high stability: after one month the power output was 94.2% of the original maximum value.
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高影响因子
RSC Advances
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2017
·Vol. 7
·期 4
·2315-2322
·
IF 3.108
Jianbo Li,Yanhui Wang,Yuanling Sun,Chaofan Ding,Yanna Lin,Weiyan Sun,Chuannan Luo
A simple and sensitive electrochemical sensor for detection of dopamine has been developed based on ionic liquid functionalized graphene oxide supported gold nanoparticles (GO-IL-AuNPs) coated onto a glassy carbon electrode. The prepared graphene oxide, ionic liquid functionalized graphene oxide and GO-IL-AuNPs were characterized in detail by scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The electrochemical properties of the hybrid nanomaterials were evaluated through cyclic voltammetry and electrochemical impedance spectroscopy. Meanwhile, the activities of hybrid nanomaterials toward the oxidation of dopamine were analyzed via cyclic voltammetry and differential pulse voltammetry. The resulting sensor showed excellent electrocatalytic activity towards dopamine. Under the optimum conditions, differential pulse voltammetry was employed to detect ultra-trace amounts of dopamine, for which a wide linear range of 7 nM to 5 μM and a limit of detection 2.3 nM (S/N = 3) were obtained. The proposed sensor exhibited excellent accuracy and precision and the relative standard deviation (RSD) was less than 5%. The highly sensitive sensor was successfully used for accurate determination of the content of dopamine in practical samples.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Jiayi Jin,He Mei,Huimin Wu,Shengfu Wang,Qinghua Xia,Yu Ding
The Cu 2 O@Pt nanoparticles were prepared by a two-step method, using Vulcan XC-72 carbon as support (donated as Cu 2 O@Pt/C). Transmission electron microscopy , X-ray diffraction and X-ray photoelectron spectroscopy were used to characterize the resulting Cu 2 O@Pt core-shell nanoparticles. The chemically modified electrode based on Cu 2 O@Pt/C nanocomposites was employed to eliminate the interference from ascorbic acid and uric acid for the sensitive and selective determination of dopamine. The electrochemical results indicate that the Cu 2 O@Pt/C nanocomposites show better electrocatalytic activity for the oxidation of dopamine than Pt/C nanocomposites with a linear range from 10 nM to 1027.16 μM, a detection limit of 3 nM (S/N = 3) and sensitivity of 638.0 μA mM −1 cm −2 . Moreover, the sensor exhibits excellent long-time stability, good reproducibility and can be applied for practical application.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
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IF 4.758
Bin Wang,Yuanya Wu,Yanfen Chen,Bo Weng,Changming Li
A flexible free-standing paper sensor was fabricated for the first time via in situ growth of Cu nanoflower on reduced graphene oxide (RGO) sheets towards amperometrically non-enzymatic detection of glucose. The low cost of copper (Cu) and graphene made the prepared sensor inexpensive in comparison with sensors made from noble metal catalysts . This Cu-RGO paper sensor exhibited high sensitivity and good selectivity when utilised in glucose sensing attributed to the synergistic effects of graphene paper and Cu nanoflowers. The combination of excellent catalytic activity , largely reactive surface area of Cu nanoflower and good conductivity of graphene paper enabled the sensor to perform well in glucose detection. The prepared glucose sensor holds a great promise for inexpensive flexible electrochemical non-enzymatic glucose sensors.
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 7
·2073-2079
·
IF 4.58
Chen Lihua,Liu Xiang,Wang Cunguo,Lv Shuli,Chen Chuangfu
The paper describes an electrochemical nitrite sensor based on the use of a nanocomposite consisting of poly(3,4-ethylenedioxythiophene) (PEDOT) doped with polyacenic semiconductor (PAS), a quasi-graphene carbon material. The composite possesses a large specific surface area and a large number of active sites. It shows high catalytic activity towards the oxidation of nitrite. Such activity is not observed in the individual components. Nitrite provides a well-defined oxidation peak at 0.80 V (vs. Ag/AgCl) at a pH value of 7.4. The influence of many possible ionic interferents was found to be negligible. In addition, the oxidation peaks of dopamine hydrochloride, ascorbic acid, uric acid and nitrite are well separated from each other. Under optimized experimental conditions, anodic peak currents are linearly related to nitrite concentrations in the range from 0.3 μM to 6.6 mM, and the detection limit is 98 nM (at an S/N ratio of 3). The sensor was used to quantify nitrite in (spiked) tap water and sausage samples, where it gave acceptable recoveries.
Schematic presentation of a nanocomposite consisting of poly(3,4-ethylenedioxythiophene) (PEDOT) doped with polyacenic semiconductor (PAS). The composite possesses a large specific surface area and a large number of active sites. It shows high catalytic activity towards the oxidation of nitrite.
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高影响因子
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