JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 24
·期 3
·583-590
·
IF 2.646
Yu Zhipeng,Kong Chuncai,Lv Jian,Ma Bo,Zhang Xiaojing,Yang Zhimao
Designing highly active material to fabricate high-performance glucose sensor was great importance for diabetes treatment. In this work, we develop a novel nanocomposite composed of multilevel nanostructure with ultrathin Cu x O nanoflakes anchored on Cu 2 O nanowires, directly on Cu foil and its application as non-enzymatic glucose sensor. Due to more active sites endowed by the ultrathin Cu x O nanoflakes, the as-prepared Cu x O nanoflakes/Cu 2 O nanowires@Cu nanoarray exhibit high sensitivity (3.59 mA mM −1 cm −2 ), low detection limit (0.69 μM), high selectivity, fast amperometric response (~ 2 s) and excellent reliability in human serum. And the sensitivity of ultrathin Cu x O nanoflakes/Cu 2 O nanowires@Cu nanoarray was 1.9-fold than that of Cu 2 O nanowires@Cu nanoarray. Such novel multilevel nanoarray synthesized by convenient method provides a facile way to design metal oxide nanomaterial for promising non-enzymatic glucose sensor.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Zhuoli Xu,Kang Zhao,Fuping Li,Yashan Huo,Yufei Tang
In this paper, ZrB 2 –ZrC composite nanofibers were prepared by electrospinning method followed by carbothermal reduction process. Nanofibers with ZrC content of 15, 35 and 50 wt%, respectively, were obtained by varying the n(B)/n(Zr) molar ratio. The oxidation resistance of fabricated nanofibers was investigated by the non-isothermal thermogravimetric method. The effect of ZrC content on the oxidation resistance of ZrB 2 –ZrC composite nanofibers was analyzed systematically. The Kissinger method was used to calculate the oxidative activation energy (E) of the fibers with different ZrC content. The results show that the E values of fiber with n(B)/n(Zr) equal to 2.5, 3.5 and 4 are 219, 362 and 275 kJ/mol. Among the prepared fibers, the fiber with n(B)/n(Zr) of 3.5 has the highest oxidative activation energy and the best oxidation resistance.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Na Wu,Yi-Ting Wang,Xiao-Yan Wang,Feng-Na Guo,Hui Wen,Ting Yang,Jian-Hua Wang
Nanozymes have emerged as promising alternatives to overcome the high cost and low stability issues of natural enzymes . Particularly, those with peroxidase-like activities have been extensively studied to construct versatile biosensors . In this article, we demonstrate that the modification of the graphitic carbon nitride nanosheets (g-C 3 N 4 nanosheets) by plasmonic gold nanoparticles (AuNPs) greatly enhances its catalytic performance as peroxidase mimetic. In the presence of H 2 O 2 , the [email protected] 3 N 4 nanosheets can catalyze the redox reaction of 3,3′,5,5′- tetramethylbenzidine (TMB) to produce a blue color. Based on the observation, a colorimetric sensing method for glucose is further developed with the assistance of glucose oxidase (GOx). The linear range for glucose is from 5 to 100 μmol L −1 (R 2 = 0.9967) and the limit of detection (LOD) is 1.2 μmol L −1 . The LOD can be further lowered down to 0.75 μmol L −1 by using H 2 SO 4 as termination agent and measuring the absorbance of the yellow product at λ = 451 nm. Moreover, the practical usefulness of [email protected] 3 N 4 nanosheets as a peroxidase nanozyme for glucose determination in human serum and urine is also demonstrated.
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Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 44
·7006-7013
·
IF 5.047
Li Zhang,Xiaoni Ma,Hongbo Liang,Huihui Lin,Guangyu Zhao
Non-enzymatic glucose sensors are attracting significant attention owing to their low cost, storage convenience and reusability; however, their poor anti-interference caused by their weak selectivity towards glucose limits their practicability. In the present study, a MIL-53(NiFe) metal–organic framework (MOF) was prepared on Ni foam to serve as a self-supported electrode for non-enzymatic glucose detection. Due to the abundant active sites in the MIL-53(NiFe) MOF and its good stability in an alkaline solution, the sensors exhibited a high sensitivity (41.95 mA mM−1 cm−2) and a low detection limit (0.67 μM). Moreover, the molecular sieve effect of the MIL-53(NiFe) MOF led to a remarkable anti-interference ability, even at the interference concentrations of up to 20% glucose, a higher value than that in human serum. In addition, a heat treatment was carried out to remove the residual terephthalic acid in the MOF tunnels, and this promoted the detection linear range to 2–1600 μM. The reusability, reproducibility and long-term stability of the sensors were also studied, and the results implied good practicability of the MIL-53(NiFe) MOF-based sensors. Furthermore, the good practicability of the sensors was verified by testing human serum samples. The results showed the relative standard deviation of 2.73% from the hospital results, and the standard recovery was nearly 100%.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 16
·B1681
·
IF 3.12
Dandan Song,Lili Wang,Yuning Qu,Bing Wang,Yanting Li,Xueli Miao,Yuying Yang,Cunpeng Duan
Constructing a reasonable electrode material structure is significant for the sensitivity and selectivity of glucose detection. Herein, in this paper, the three-dimensional (3D) hierarchically layered double hydroxides (CC@CCH MOF LDH) is prepared by using carbon cloth (CC) as the conductive base, cobalt carbonate nanorod (CCH) as the guiding template and metal organic framework (MOF) as the sacrifice template. This unique 3D hierarchical structure facilitates the rapid transfer of ions and the reversible redox reaction. Moreover, the electrochemical tests confirm that the material has excellent electrocatalytic oxidation activity in alkaline solution. The amperometric detection results reveal that CC@CCH MOF LDH electrode material possesses better selectivity, higher sensitivity (4310 μA·mM−1·cm−2), fast amperometric response (<6 s), wide linear range (0.001-2 mM) and low detection limit (110 nM) under the optimal conditions, which is expected to be a high performance enzyme-free glucose sensor.
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Nanomaterials
·
2019
·Vol. 9
·期 2
·132
·
IF 4.034
Libo Yu,Zhen Li
ZnxCd1-xSe@ZnO hollow spheres (HS) were successfully fabricated for application in quantum dot sensitized solar cells (QDSSCs) based on ZnO HS through the ion-exchange process. The sizes of the ZnxCd1-xSe@ZnO HS could be tuned from ~300 nm to ~800 nm using ZnO HS pre-synthesized by different sizes of carbonaceous spheres as templates. The photovoltaic performance of QDSSCs, especially the short-circuit current density (Jsc), experienced an obvious change when different sizes of ZnxCd1-xSe@ZnO HS are employed. The ZnxCd1-xSe@ZnO HS with an average size distribution of ~500 nm presented a better performance than the QDSSCs based on other sizes of ZnxCd1-xSe@ZnO HS. When using the mixture of ZnxCd1-xSe@ZnO HS with different sizes, the power conversion efficiency can be further improved. The size effect of the hollow spheres, light scattering, and composition gradient structure ZnxCd1-xSe@ZnO HS are responsible for the enhancement of the photovoltaic performance.Keywords:alloyed quantum dots;hollow spheres;sensitized solar cells;zinc oxide
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Pei Yang,Ziqi Zhu,Minzhi Chen,Xiaoyan Zhou,Weimin Chen
A facile and straightforward microwave-assisted method was used to prepare polyamine-functionalized carbon dots (CDs) from a precursor comprising renewable xylan and branched polyethyleneimine (BPEI). The as-prepared BPEI-CDs were monodispersed sphere particles with an average diameter of about 8.62 nm, and exhibited excellent fluorescent property and high stability, as well as excitation-independent emission behavior. Furthermore, it is attractive that the BPEI-CDs can be used as novel fluorescent probes for detecting tannic acid (TA) sensitively and selectively. At the optimum condition, the TA detection system was established in water solution and ethanol solution with a dynamic range from 0.1 to 5 μM, and their detection limit of 36.8 nM and 44.9 nM were also determined, respectively. Most importantly, the BPEI-CDs-based sensors can be successfully applied to detect TA in real lake water and white wine samples, suggesting the low-cost and excellent BPEI-CDs are potential suitable for TA detection in practical application.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-8
·
IF 5.479
Yang Hongmei,Su Rui,Wishnok John S.,Liu Ning,Chen Changbao,Liu Shuying,Tannenbaum Steven R.
Magnetic silica nanoparticles (MSNPs) were prepared and applied for the first time as a matrix in MALDI MS for analysis of small thermally labile biomolecules including oligosaccharides, amino acids, peptides, nucleosides, and ginsenosides. The matrix was characterized by scanning electron microscopy and UV-vis spectroscopy. It displays good performance in analyses of such biomolecules in the positive ion mode. In addition, the method generates significantly less energetic ions compared to the use of carbon nanotubes or graphene-assisted LDI MS and thus produces intact molecular ions with little or no fragmentation. In addition, the MSNPs have better surface homogeneity and better salt tolerance and cause lower noise. It is assumed that the soft ionization observed when using MSNPs as a matrix is due to the specific surface area and the homogenous surface without large clusters. The matrices were applied to the unambiguous identification and relative quantitation of the water extract of Panax ginseng roots. Any false-positive results as obtained when using graphene and carbon nanotubes as a matrix were not observed.
Schematic presentation of the application of magnetic silica nanoparticles in laser desorption ionization mass spectrometry. Their use results in little or no fragmentation during analysis of small labile biomolecules with some advantages such as better surface homogeneity, high salt tolerance, and lower noise.
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Applied Materials Today
·
2019
·
IF 8.013
Jiachen Ge,Xuanyu Yang,Jiahang Luo,Junhao Ma,Yidong Zou,Jichun Li,Wei Luo,Xiaowei Cheng,Yonghui Deng
With increasing requirements of replacing the high-cost and unstable natural enzymes, the rational design of highly efficient inorganic mimetic enzymes (nanozymes), as one of the most important bioactive materials, has attracted more and more attention in recent years. In our work, using the solvent evaporation induced co-assembly strategy with high-molecular weight poly(ethylene oxide)-block-polystyrene (PEO- b -PS) diblock copolymer as the template and two metal salts as the co-precursors in one-pot system, we synthesized ordered mesoporous heteroatom-doped CeO 2 with high surface area, bimodal pore sizes and highly crystallized walls. The composite materials were then constructed as the mimetic enzymes to investigate their peroxidase-like catalytic performance and detect H 2 O 2 and glucose as bioactive materials in diverse systems including complex biological samples. It was demonstrated that mesoporous 5%CoO/CeO 2 catalyst was the best peroxidase mimic, following the typical Michaelis–Menten kinetics and exhibiting the excellent peroxidase-like catalytic performance toward 3,3′,5,5′-tetramethylbenzidine (TMB) with comparable K m and V m values to horseradish peroxidase (HRP) enzyme. A highly sensitive and selective colorimetric assay was developed to detect H 2 O 2 and glucose with detection limits of 0.88 and 19.6 μM, respectively. The promising catalytic behavior of mesoporous 5%CoO/CeO 2 as the peroxidase-like bioactive catalyst could be ascribed to its interconnected large mesopores, rich exposed surface defects and oxygen vacancies introduced by the heterojunction interface of ultrasmall CeO 2 and CoO nanocrystals within pore walls.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Sushuang Li,Jianquan Luo,Xiaofeng Hang,Shiguang Zhao,Yinhua Wan
Polycyclic aromatic hydrocarbons (PAHs), as a group of micropollutants with high toxicity, are commonly detected in the environment and difficult to remove. In this work, five commercial polyamide (PA) nanofiltration (NF) membranes were used to treat three PAHs in the synthetic solution or coking wastewater and their removal mechanisms were discussed. By comparing water permeability and PAHs rejections of the NF membranes before and after PAHs adsorption, we found that the PAHs adsorption into the membrane was the dominant rejection mechanism at the initial filtration stage. Due to the limited adsorption capacity and increasing diffusion of PAHs in the membrane, the PAHs rejections would drop rapidly and then reach steady. Size exclusion mechanism was also important to PAHs removal by NF, especially for PAHs with weaker polarity and higher molecular weight. Although the polysulfone intermediate layer could adsorb substantial PAHs resulting in an increase of filtration resistance, the pore blocking and narrowing effects on the PA separation layer were still the main reasons for the permeability loss of NF membranes. However, the glucose rejection did not change obviously after the PAHs adsorption in the membrane. Through analyzing porosity and pore size distribution of the NF membranes before and after PAHs adsorption, we found that for the NF membrane with small pore size and narrow pore size distribution (e.g. NF270), PAHs adsorption produced indiscriminate pore blocking effect, and thus the average pore size and its distribution as well as glucose rejection did not change obviously after fouling formation; while for the NF membrane with large pore size and wide pore size distribution (e.g. NF10), PAHs adsorption occurred more seriously in the larger pores leading to a pore narrowing effect, but the reduced pore size was still too large to affect glucose rejections. The outcomes of this work suggested that the PAHs adsorption in both separation and intermediate layers of NF membranes should be avoided, and the NF membrane with narrow pore size distribution was preferred for PAHs removal.
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SOLAR ENERGY
·
2019
·
IF 4.674
Zhen Li,Libo Yu
Mn-Cd x Zn 1-x Se@ZnO multi-shelled (including single-shelled, double-shelled, and triple-shelled) hollow microspheres (HMS) were successfully synthesized for application in quantum dots sensitized solar cell (QDSSC). The influence of shell numbers on photovoltaic performance of QDSSC were investigated. The results showed that larger surface area, repeated light reflection and reinforced light scattering can be achieved with triple-shelled HMS, which can improve light harvesting efficiency. Furthermore, midgap state created by Mn-doping in Cd x Zn 1-x Se will facilitate electrons injection and collection from excited Cd x Zn 1-x Se quantum dots (QDs) to ZnO. The multi-shelled effects and Mn-doping finally improve the short-circuit current (J sc ) of Mn-Cd x Zn 1-x Se@ZnO tripled-shelled HMS solar cell to 20.21 mA cm −2 , leading to the power conversion efficiency significantly enhanced to 3.39%.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Weidong Zhao,Yun Zhu,Litong Zhang,Yunlong Xie,Xiangrong Ye
Porous activated carbon (PAC) with three-dimensionally (3D) interconnected structure has been successfully synthesized using sucrose and potassium hydroxide as carbon source and pore-forming agent, respectively. On account of its hierarchically porous structure and high specific surface area (1615 m 2 g −1 ), the synthesized porous carbon displays a maximal specific capacitance of 119 F g −1 at 1 A g −1 and a capacitance retention rate of 81.2% after 5000 cycles at 20 A g −1 in 1 M TEABF 4 /AN electrolyte. It also exhibits a maximal specific capacitance of 178 F g −1 at 0.5 A g −1 and a capacitance retention rate of 88.9% after 10000 cycles at 16 A g −1 in 1 M Na 2 SO 4 electrolyte. Moreover, the fabricated symmetric supercapacitor reveals a high energy density , 16.52 W h Kg −1 in 1 M TEABF 4 /AN and 15.78 W h Kg −1 in 1 M Na 2 SO 4 . Such an excellent supercapacitive performance implies that the prepared activated carbon with 3D interconnected porous structure could be potentially used for high performance energy storage device.
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