JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 22
·9425-9435
·
IF 3.553
Guo Yufei,Wang Li,Xu Lijuan,Peng Canwei,Song Yonghai
A flexible ascorbic acid (AA)-imprinted poly(o-phenylenediamine) (ploy(o-PD))/zeolite imidazole frameworks-67 (ZIF-67)/carbon cloth (CC) electrode was prepared for electrochemical sensing AA. The flexible AA-imprinted poly(o-PD)/ZIF-67/CC electrode was prepared by growing ZIF-67 on flexible CC, electropolymerization of o-PD with AA on ZIF-67/CC and eluting template molecules AA. The results showed that the spherical ZIF-67 crystals were arranged evenly and firmly on the fibers of CC surface. The diameter of spherical ZIF-67 crystals was approximately 500–600 nm, and the spherical ZIF-67 crystals catalyzed the oxidation of AA well. A layer of poly(o-PD) with AA-imprinted pores was covered on the ZIF-67/CC electrode, so the AA-imprinted poly(o-PD)/ZIF-67/CC electrode exhibited better selectivity toward AA detection and good stability. The molecularly imprinted sensor exhibits high sensitivity, and the sensitivity could reach 959.9 μA/mM −1 cm −2 , the detection limit was 0.019 μM, and the concentration range of AA was 0.057 μM–11.4 0 mM. The AA-imprinted poly(o-PD)/ZIF-67/CC electrode also showed higher stability and repeatability. The results proved that the spherical ZIF-67 crystals were good electrode materials for electrochemical AA biosensors.
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NANOTECHNOLOGY
·
2019
·Vol. 31
·期 4
·045501
·
IF 3.399
Jinlei Huang,Siyuan Lu,Xufei Fang,Zixuan Yang,Xue Liu,Shuxin Li,Xue Feng
Prussian blue (PB) modified nanoporous gold (NPG) electrodes exhibit great potential for improving the detection sensitivity and stability for hydrogen peroxide monitoring. The NPG provides large surface-to-volume ratio as well as diffusion 'highways' to assist the transfer of the ions. In the present work, we optimized the deposition time for NPG fabrication and examine the electrochemical performance of the electrodes. A critical deposition time on the electrochemical performances including linear range, operational stability and sensitivity was experimentally determined. Below and above such a deposition time, two different growth patterns of the microstructures were observed. This transition of deposited structures corresponding to the critical time results in different pathways for electron transfer and ion diffusivity through PB lattice.
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RSC Advances
·
2019
·Vol. 9
·期 56
·32848-32853
·
IF 3.049
Yan Huang,Pilan Zhang,Hualei Hu,Danxin Hu,Jie Yang,Yexin Zhang,Chunlin Chen,Yong Yang,Jian Zhang,Lei Wang
A group of CuAPO-5 molecular sieves with trace Cu were successfully synthesized via an ionothermal method and used for fructose dehydration to 5-hydroxymethylfurfural (HMF) in [BMIM]Br ionic liquid. The 0.06-CuAPO-5 sample displayed excellent performance and a HMF yield of 93.8% was obtained, which could be ascribed to the balance between acid strength and mass transfer efficiency. This work demonstrates that the ionothermal synthesized CuAPO-5 molecular sieve was also a good candidate for the efficient production of HMF.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-10
·
IF 5.479
Gan Xiaorong,Zhao Huimin,Schirhagl Romana,Quan Xie
A non-enzymatic fluorometric assay is described for the determination of glucose. The method is based on the use of g-C 3 N 4 quantum dots (QDs) that have good water solubility. The QDs were synthesized by a one-step solvothermal process using formamide as precursor. The QDs possess an average size of ~5 nm, a band gap of 3.0~3.5 eV, and strong blue fluorescence (with excitation/emission maxima at 400/447 nm). Fluorescence is quenched by glucose (which acts as the electron acceptor) via an electron transfer mechanism. Comprehensive spectroscopy and density functional theory calculations show that the selectivity of the fluorescent probe can be attributed to the presence of N-H bonds that are formed between the QDs (mainly at plane edges) and glucose. The interaction forces lead to the formation of localized states for capturing hot electrons. This results in a decrease in the band gap and a reduction in fluorescence intensity. The probe is selective over some typical interfering species (such as cysteine and albumin) which often are present in the urine of diabetics. The method has a linear response in the 0.2 to 5.0 mM glucose concentration range and a 0.2 mM detection limit.
Schematic representation of the synthesis of g-C 3 N 4 quantum dots (QDs) as a fluorescent nanoprobe for selective detection of glucose.
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CELLULOSE
·
2019
·Vol. 27
·期 3
·1451-1463
·
IF 3.917
Zhou Lipeng,Gao Dongting,Yang Jingru,Yang Xiaomei,Su Yunlai,Lu Tianliang
Abstract Conversion of cellulose to chemicals is an economic and environmental route for biomass utilization. In this work, efficient conversion of cellulose to alkyl levulinates and levulinic acid was realized by oxidation pretreatment combined with alcoholysis over Al 2 (SO 4 ) 3 catalyst. Proper pre-oxidation conditions including oxidation temperature and time are important. By pre-oxidation, part of hydroxymethyl groups on cellulose was converted to carboxyl groups which provide the Brønsted acid sites near the glycosidic bonds to improve the depolymerization of cellulose to monosaccharide. Al 2 (SO 4 ) 3 ·18H 2 O can play both Brønsted and Lewis acid roles in methanol and catalyze the conversion of monosaccharide to alkyl levulinates and levulinic acid. After pre-oxidation at optimized conditions, cellulose can be converted into methyl levulinate and levulinic acid over Al 2 (SO 4 ) 3 in methanol efficiently, and total yield of methyl levulinate and levulinic acid can reach 66.8% at 180 °C for 3 h. Furthermore, the simple and cheap Al 2 (SO 4 ) 3 catalyst is recyclable which is important for the practical application. Graphic abstract
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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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SENSORS
·
2019
·Vol. 19
·期 22
·5055
·
IF 3.031
Min Jiang,Peng Sun,Jie Zhao,Lihua Huo,Guofeng Cui
Flexible physiological medical devices have gradually spread to the lives of people, especially the elderly. Here, a flexible integrated sensor based on Au nanoparticle modified copper hydroxide nanograss arrays on flexible carbon fiber cloth ([email protected](OH)2/CFC) is fabricated by a facile electrochemical method. The sensor possesses ultrahigh sensitivity of 7.35 mA mM−1cm−2in the linear concentration range of 0.10 to 3.30 mM and an ultralow detection limit down to 26.97 nM. The fantastic sensing properties can be ascribed to the collective effect of the superior electrochemical catalytic activity of nanograss arrays with dramatically enhanced electrochemically active surface area as well as mass transfer ability when modified with Au and intimate contact between the active material ([email protected](OH)2) and current collector (CFC), concurrently supplying good conductivity for electron/ion transport during glucose biosensing. Furthermore, the device also exhibits excellent anti-interference and stability for glucose detection. Owing to the distinguished performances, the novel sensor shows extreme reliability for practical glucose testing in human serum and juice samples. Significantly, these unique properties and the soft structure of silk fabric can provide a promising structure design for a flexible micro-device and a great potential material candidate of electrochemical glucose sensor.Keywords:Cu(OH)2nanograss;Au nanoparticles;glucose detection;flexible electrochemical biosensor
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yi Zhang,Yiyue Ma,Yinge Li,Wenxin Zhu,Ziyi Wei,Jing Sun,Tao Li,Jianlong Wang
Transition-metal sulphides have drawn intense attention in the fabrication of electrochemical glucose sensors. Nevertheless, in their typical synthetic process, the nocuous organic reagents and high-temperature treatment are always required. In this work, we synthesized a nickel-cobalt carbonate hydroxysulfide multistage nanowire array (NiCo-CHS NW) on carbon cloth (CC) through room-temperature sulfuration of nickel-cobalt carbonate hydroxide. The formed leaves-on-branchlet structure provides more active sites and higher areal specific capacitance, while the introduction of sulfur improves the electron-transfer kinetics. Beneficial from both the structural and compositional advantages, the NiCo-CHS NW/CC electrode exhibits a wide linear range of 0.25–3308 μM, a low determination limit of 0.25 μM, and a high sensitivity of 2209 μA mM −1 cm −2 . In addition, it also shows high selectivity , good stability and reproducibility, and high feasibility of sensing glucose in human blood serum.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Di Cheng,Tuo Wang,Guangxue Zhang,Huimin Wu,He Mei
Cu x Co 3-x O 4 (x = 0.5, 1, 1.5, 2) are successfully synthesized through hydrothermal and calcination processes. A series of electrochemical tests reveal that all of them exhibit electrocatalytic activity towards glucose and H 2 O 2 . Among them, CuCo 2 O 4 (x = 1) has a unique double-shelled hollow structure and shows higher catalytic performance. The electrochemical sensor based on CuCo 2 O 4 displays a linear range from 2.5 μM to 7.9 mM, with a sensitivity of 400.0 μA mM −1 cm −2 for the detection of glucose. As for H 2 O 2 , it shows a linear range from 10.0 μM to 8.9 mM, with a sensitivity of 94.1 μA mM −1 cm −2 . The sensor also exhibits short response time (<3 s), good selectivity, reproducibility, and stability over 18 days. Thus, this novel non-enzyme sensor has potential application in glucose and H 2 O 2 detection.
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MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Yang Lili,Wang Hao,Lü Haitao,Hui Ni
A nanocomposite consisting of phytic acid (PA) that was doped with poly(3,4-ethylenedioxy-thiophene) (PEDOT) and modified with copper nanoparticles (CuNPs) was placed on a glassy carbon electrode and then applied in an enzymeless glucose sensor. The undulating PEDOT/PA composite has good conductivity and a large surface area, which was suitable as substrate for the uniform growth of CuNPs. The modified electrode typically operated at a potential near 0.55 V (vs. Ag/AgCl) demonstrated remarkable catalytic activity towards direct oxidation of glucose in NaOH solution (the major limitation of this sensor). Figures of merit include (a) a wide analytical range (5 to 403 μM); (b) high sensitivity (79.27 μA·μM −1 ·cm −2 ), (c) a low detection limit (0.28 μM at a signal to noise ratio of 3), and (d) fast response (< 4 s).
A nanocomposite of phytic acid (PA) doped poly(3,4-ethylenedioxy-thiophene) (PEDOT) modified with copper nanoparticles (CuNPs) onto a glassy carbon electrode was prepared by electrochemical strategy. The CuNPs/PEDOT/PA-modified electrodes were applied in enzymeless glucose sensors with high performance.
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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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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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