MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Li Xiuqi,Zhong Li,Liu Ruilin,Wei Xiaoping,Li Jianping
A molecularly imprinted polymer photoelectrochemical (MIP-PEC) sensor based on bismuth sulfide (Bi 2 S 3 ) is described for the determination of the plasticizer dioctyl phthalate (DOP). Bi 2 S 3 was used as the photoelectrical converter of the sensor, and visible light was utilized as the excitation source. The molecular imprinting film was prepared through the electropolymerization of monomers in the presence of DOP. Under optimal experimental conditions, the photoelectrochemical response was linearly proportional to the logarithm of the DOP concentration in the 0.5–70 pM DOP concentration range, and the detection limit was 0.1 pM. The method is highly stable and reproducible. It was applied to the determination of DOP in spiked water samples.
A novel molecularly imprinted photoelectrochemical sensor with high sensitivity and high selectivity based on Bi 2 S 3 was developed for dioctyl phthalate detection. Bi 2 S 3 was firstly used as a photoelectric converter in photoelectrochemical sensor to improve the sensitivity of the sensor. Combining photocurrent measurement with molecular imprinting technique makes the sensor highly selective.
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高影响因子
Journal of Central South University
·
2020
·Vol. 26
·期 11
·2953-2960
·
IF 1.249
Liu Piao,He Wen-qiang,Lu An-xian
Finer nanoplates of silver are prepared by self-assembly on the surface of graphene, and the low-temperature sintered high conductivity ink containing the silver nanoplates is prepared. Most importantly, graphene is added to the solution before the chemical reduction reaction occurs. Firstly, it is found that silver nanoplates have self-assembly phenomenon on the surface of graphene. Secondly, the Ag nano hexagonal platelets (AgNHPs) with small particle sizes (10 nm), narrow distribution and good dispersion are prepared. Especially, smaller sizes (10 nm) and narrower particle size distribution of AgNHPs particles can be easily controlled by using this process. Finally, the conductivity of the ink is excellent. For example, when the printed patterns were sintering at 150 °C, the resistivity of the ink(GE: 0.15 g/L) reached the minimum value of 2.2×10 −6 Ω·cm. And the resistivity value was 3.7×10 −6 Qcm, when it was sintered at 100 °C for 30 min. The conductive ink prepared can be used for the field of printing electronics as ink-jet printing ink.
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JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 3
·2058-2065
·
IF 1.774
Lan Ye,Chen Dajun
Porous silica-based anode materials with high theoretical specific capacity and abundant reserves have attracted popular attention for application in lithium ion batteries (LIBs). However, poor electrochemical conductivity and mechanical performance hinder the development of silica-based anode materials. In this work, attapulgite/multi-walled carbon nanotube (AT/CNT) composite anode materials were prepared. The structural features of AT/CNT composite aerogels were characterized by field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), x-ray diffraction (XRD) and Brunauer–Emmett–Teller (BET). because of the excellent conductivity and porous pathways of AT/CNT anode material, the reversible specific capacity of AT/CNTs containing 0.5 wt.% CNTs (AT-0.5) with a mass loading of 0.67 mg cm −2 was 303.6 mAh g −1 at 0.1 A g −1 after 50 cycles, and a coulombic efficiency of AT-0.5 was 99.1%. The green LEDs were lit by the assembled battery of AT-0.5. The electrochemical results demonstrated that AT/CNT anode materials possessed practical application values for energy storage. Moreover, the preparation method of AT/CNT anode materials is efficient and environmentally friendly.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 7
·2913-2922
·
IF 3.442
Zhong Zeqin,Chen Lingzhen,Huang Shaozhen,Shang Weili,Kong Lingyong,Sun Ming,Chen Lei,Ren Wangbao
Single-crystalline LiNi 0.5 Co 0.2 Mn 0.3 O 2 (denoted as SC-523) with micron size had been successfully synthesized through a facile method. Electrochemical impedance spectroscopy and differential scanning calorimetry were carried out to identify the improved electrochemical performance and desired thermal stability. Even after 100 cycles, SC-523 still delivered a discharge capacity of 151.1 mA h g −1 (capacity retention with 90.3%) at 1 C in voltage range from 3.0 to 4.5 V (vs. Li/Li + ), while polycrystalline spherical LiNi 0.5 Co 0.2 Mn 0.3 O 2 (denoted as PC-523) only exhibited 141.7 mA h g −1 (capacity retention with 78.4%). Besides, SC-523 shows a higher decomposition temperature of 332.13 °C, 14.61 °C higher than that of PC-523 during the thermal decomposition. Consequently, single-crystalline particles with robust morphological integrity ensure the enhanced cycling stability and thermal stability.
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MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-11
·
IF 5.479
Wang Qian-Long,Huang Wei-Xue,Zhang Pu-Juan,Chen Li,Lio Chon-Kit,Zhou Hua,Qing Lin-Sen,Luo Pei
An ultra-sensitive method is described here for the determination of HIF-1α (an early biomarker for myocardial infarction) in circulating exosomes in serum. Gold nanospheres were functionalized with a HIF-1α-binding aptamer via sulfydryl chemistry. The apt-AuNP-coated gold seeds were grown by seed-mediated growth, and this significantly increased the peroxidase-mimicking property the nanoparticles. A chromogenic system composed of 3,3′5,5′-tetramethylbenzidine and hydrogen peroxide was used. Absorbance at 652 nm increases linearly in the 0.3 to 200 ng L −1 HIF-1α concentration range, and the limit of detection is 0.2 ng L −1 . The method was tested by analyzing rat serum from isoproterenol (ISO)-induced myocardial infarction. It allows HIF-1α to be directly determined in a 25 μL sample without preconcentration. The assay is not interfered by the polydispersity of exosomes released under either health and disease conditions.
Gold nanospheres were functionalized with a HIF-1α-binding aptamer via sulfydryl chemistry. Nanosized gold seed particles were then modified with the functionalized gold nanospheres, and this strongly increases the peroxidase-mimicking activity of the nanomaterial. By using the tetramethylbenzidine/H 2 O 2 chromogenic system, the absorbance at 652 nm increases linearly in the 0.3 to 200 ng L -1 HIF-1α concentration range.
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JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 11
·1-8
·
IF 1.53
Tian Yuhan,Pu Zejun,Xia Jialing,Hu Linqing,Cheng Jie,Zhong Jiachun
A novel soluble poly(aryl ether ketone) (PAEK) terminated with 4-nitrophthalonitrile was designed and synthesized, which was used to solve the problem of difficult solution processing. Then, a series of cross-linked PAEK films with different thermal treatment temperatures were fabricated by using 4,4-bis(3,4-dicyanophenoxy)biphenyl (BPH) as a novel cross-linking agent, improving the glass transition temperature ( T g ) of the traditional PAEK. Then, the fourier transform infrared (FT-IR) spectrum, X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA), dynamic mechanical analysis (DMA), mechanical testing machine and LCR meter were used to investigate the microstructure, thermal, mechanical and dielectric properties of PAEK films, respectively. The results indicated that the increase in heat-treatment time and temperature are beneficial for the improvement of the value of T g and T 5% , and the excellent thermal stability and mechanical properties of PAEK films are demonstrated. Compared to PAEK-1 film, the T g and T 5% both increased by 63 °C for PAEK-4 film. Significantly, the tensile strength of PAEK-3 film (42 MPa) reaches the highest value in comparison with other samples. In addition, the dielectric constants (ε) and loss tangent (tan δ) of PAEK-4 film is as low as 3.67 and 0.001 at 1 kHz, respectively. More importantly, the dielectric properties are found to be relatively stable to near the T g value, which can be widely used for applications in dielectric energy storage at high temperatures.
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IONICS
·
2019
·Vol. 26
·期 2
·971-979
·
IF 2.289
Huo Jinghao,Xue Yujia,Cheng Cheng,Guo Shouwu
Solid-state cable-type supercapacitors (SSCTSs) have a wide application in wearable and flexible electronic devices. The fiber-shaped electrode of fabricating TiO 2 nanowire arrays (NWAs) on Ti wire is widly used in flexible electronic devices. For improving the conductivity, reduced graphene oxide (rGO) nanosheets are prepared on the surface of TiO 2 NWAs by a simple electrophoretic deposition method and NaBH 4 treatment. The electrochemical tests reveal that this TiO 2 /rGO electrode has an excellent capacitive property than pure TiO 2 electrode in the optimum potential window (− 0.4~0.6 V). Two similar TiO 2 /rGO electrodes with Poly (vinyl alcohol)-LiCl solid-state electrolyte are assembled SSCTSs, which deliver a specific capacitance as high as 60.8 μF cm −1 at 5 μA cm −1 and a high energy density of 12.2 mWh cm −1 with a wide potential window from 0 to 1.2 V. Furthermore, this SSCTS exhibits outstanding banding performance at different state and long cycle life. These results demonstrate that fiber-shaped TiO 2 /rGO electrode is promising for high-performance wearable and flexible electronic devices.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 103
·期 21
·8839-8851
·
IF 3.67
Liu Yang,Zhu Lingfeng,Qi Wenpeng,Yu Bo
D- p -hydroxyphenylglycine (D-HPG) functions as an intermediate and has important value in antibiotic industries. The high pollution and costs from chemical processes make biotechnological route for D-HPG highly desirable. Here, a whole-cell transformation process by D-hydantoinase(Hase) and D-carbamoylase(Case) was developed to produce D-HPG from DL-hydroxyphenylhydantoin(DL-HPH) in Escherichia coli . The artificially designed ribosome binding site with strong intensity significantly facilitated the protein expression of limiting step enzyme Case. Next, the cell wall permeability was improved by disturbing the peptidoglycan structure by overproduction of D,D-carboxypeptidases without obviously affecting cell growth, to increase the bioavailability of low soluble hydantoin substrate. By fine-tuning regulation of expression level of D,D-carboxypeptidase DacB, the final production yield of D-HPG increased to 100% with 140 mM DL-HPH substrate under the optimized transformation conditions. This is the first example to enhance bio-productivity of chemicals by cell wall engineering and creates a new vision on biotransformation of sparingly soluble substrates. Additionally, the newly demonstrated ‘hydroxyl occupancy’ phenomenon when Case reacts with hydroxyl substrates provides a referential information for the enzyme engineering in future.
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NPG Asia Materials
·
2019
·Vol. 11
·期 1
·1-12
·
IF 8.052
Su Danni,Zhang Xiaomeng,Wu Aiping,Yan Haijing,Liu Ziyi,Wang Lei,Tian Chungui,Fu Honggang
Driving the electrocatalytic hydrogen evolution reaction (HER) with solar-energy cells is considered a green and sustainable way to produce H 2 . Herein, CoO-Mo 2 N hollow heterojunctions were designed for effective HER based on the combined virtues of the hollow structure and heterojunctions. The hollow CoMoO 4 -Co(OH) 2 precursor was first synthesized via the reaction of Co 2+ from ZIF-67 with MoO 4 2− and OH − in a Na 2 MoO 4 solution. A series of experiments indicate the formation of the hollow Co-Mo-O precursor followed a mechanism analogous to the nanoscale “Kirkendall Effect”. After heating in NH 3 , the CoO-Mo 2 N hollow heterostructure was obtained. The Mo species in the precursor played an important role in maintaining the morphology under nitridation treatment. The hollow structure is favorable for contact and diffusion of electrolyte with (in) catalysts, while the CoO in CoO-Mo 2 N is favorable for the dissociation of water. Both promote the HER. Under optimized conditions, the hollow catalyst exhibited good HER performance with an overpotential of 65 mV at 10 mA cm −2 in 1 M KOH. The performance is better than that of many nonprecious metal-based catalysts. An electrolyzer composed of CoO-Mo 2 N heterojunctions as the cathode and NiFe-LDH as the anode can be driven by a solar cell to achieve effective overall water splitting. The adjudication of MOFs makes the route promising for the design of robust catalysts for advanced application.
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MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Zhang Chun-Xia,Gao Yan-Cai,Wang Chong,Yu Xu,Li Hong-Wei,Wu Yuqing
The fluorescence of adenosine monophosphate-capped bimetallic gold and silver nanoclusters (type AuAgNC@AMP) is strongly enhanced and blue shifted in the presence of Al(III). As confirmed by transmission electron microscopy, the AuAgNC nanodots are converted to larger assembled spheres of type AuAgNC-Al(III). The fluorescence enhancement is attributed to aggregation-induced emission enhancement (AIEE). The fluorescence of the AuAgNC-Al(III) assembly (with excitation and emission maxima at 340 and 540 nm) is quenched by cysteine (Cys). The effect was applied to the fluorometric determination of Cys. The assay works in the 1.0 to 16.0 μM Cys concentration range and has a 50 nM limit of detection. The method was successfully applied to analyze Cys-spiked mineral waters and serum. The quenching mechanism is explored in depth. It is attributed to the partial replacement of AMP by Cys at the surface of the AuAgNC and alteration of the assembly structure from large spherical particles to a strip shape.
Schematic representation of the fluorescence enhancement of bimetallic nanoclusters capped with adenosine monophosphate by using Al(III), and its application in selective and sensitive determination of cysteine via ligand replacement and reassembly.
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Nature Catalysis
·
2019
·Vol. 2
·期 11
·1035-1044
·
IF 0
Qiao Yu,Jiang Kezhu,Deng Han,Zhou Haoshen
Li–O 2 batteries have received considerable attention owing to their high theoretical gravimetric energy densities. However, the sluggish kinetic barrier between gaseous O 2 and solid products leads to severe polarized overpotenial. Besides, the gas-open cell architecture and cumbrous O 2 storage accessories bring additional burdens on practical application. Here, by pre-embedding Li 2 O nanoparticles into an iridium–graphene catalytic host, we confine the O 2 -free reversible Li 2 O/Li 2 O 2 interconversion within a sealed cell environment. After rationally controlling the depth of charge, the O 2 /superoxo-free charge capacity can be extended to 400 mAh g –1 (based on the entire cathodic loading mass), with only 0.12 V round-trip overpotential. Ultrastable rechargeability can be achieved for over 2,000 cycles with 99.5% coulombic efficiency. Moreover, matched with a silicon anode, the full-cell output gravimetric energy density can reach nearly 600 Wh kg –1 (based on the loading mass of both electrodes). This work shows that reversible oxide–peroxide conversion can be utilized for the development of high-energy-density sealed battery technologies.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 36
·期 5
·865-869
·
IF 1.071
Yu Fengli,Chi Yujie,Gao Chong,Chen Ruirui,Xie Congxia,Yu Shitao
A series of amino-acid-based ionic liquids was synthesized via one-step protonation of the corresponding L -amino acid by utilizing an array of proton sources. The catalytic activity of the amino-acid-based ionic liquids for the Baeyer-Villiger oxidation of cyclic ketones was investigated using cyclopentanone as a model cycloketone. The proline-based ionic liquid [ProH]CF 3 SO 3 was shown to exhibit the best catalytic activity. The reaction condition was optimized to give the following reagent ratio of n (cyclopentanone): n (catalyst): n (H 2 O 2 )=1:0.06:4, 60 °C and 6 h. Under the optimum conditions, the conversion of cyclopentanone was 96.57% and the selectivity for δ-valerolactone was 73.01%. The catalytic activity was shown to be constant after 4 cycles. A simple treatment was allowed for the recover and the reuse of [ProH]CF 3 SO 3 . The successful utilization of [ProH]CF 3 SO 3 to catalyze a host of cyclic ketones via Baeyer-Villiger oxidation clearly demonstrated the capacity of [ProH]CF 3 SO 3 to tolerate variation in the substrate.
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