JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 3
·2007-2015
·
IF 2.019
Pang Lingyun,Ni Xiuyuan
In this article, we have carried out the polymerization of vinyl imidazole and pyrrole by using graphene oxide (GO) as photoinitiator, aiming to obtain a new nanocomposite for fabricating functional devices through solution processing. The structures of the as-synthesized ternary GO–polyvinyl imidazole–polypyrrole (GO–PVim–PPy) composite were studied by specular reflection infrared spectroscopy, transmission electron microscopy, atomic force microscopy and ultraviolet–visible spectrophotometer. The as-synthesized composites show the good water dispersibility which is generated from the structures of the composites. Raman spectroscopy and X-ray photoelectron spectroscopy were used to analyze the properties of the material interface. Moreover, by using the ternary composite as the active layer, the memory devices with the sandwich structure of Al/GO–PVim–PPy/ITO were fabricated by the spin coating. The prepared devices exhibit the nonvolatile resistive switching memory properties with the ON/OFF-state current ratio reaching 10 6 and the retention time exceeding 10 4 s. The charge transport characteristics at ON-state and OFF-state were studied by analyzing the current–voltage curves.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 10
·7606-7615
·
IF 2.22
Cai Haopeng,Wei Qinqin,Xiao Hongbo,Liu Hongwei,Wang Jun
The petal-like CoO/CNFs composites was synthesized in situ by a simple hydrothermal modus. Electromagnetic parameters of the CoO/CNFs composites are further adjusted by adjusting the weight fractional number of the CoO. A rich interface of CoO is introduced into the carbon nanofibers to form a flower-like composite. This unique flower-like layered structure and appropriate electromagnetic parameters effectively enhance the impedance matching and attenuation capabilities. When the mass ratio of CoO to CNFs is 2:1, the obtained flower-like CoO/CNFs composites achieves a maximum reflection loss of − 34.62 dB with a thickness of 3 mm at 7.8 GHz. At the same time, the effective absorption area is 2.89 GHz (7.035–9.925 GHz). Therefore, taking into consideration its excellent microwave absorption properties, the petal-like CoO/CNFs composites may be deemed as a high-efficiency absorbing agent that satisfies the impedance matching and attenuation characteristics.
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Journal of the Iranian Chemical Society
·
2022
·Vol. 19
·期 6
·2543-2551
·
IF 2.271
Ge Dandan,Zhang Yi,Deng Xiujun,Yuan Lin
In this study, a zinc-based MOF material-[Zn 2 (btc)(atrz)(H 2 O) 2 ]·2H 2 O (btc = benzene-1,2,4-tricarboxylic acid, artz = 4-amino-1,2,4-triazole) was designed and applied as a sorbent for the vortex-assisted micro-solid-phase extraction (VA-µ-SPE) of UV filters from water and toner samples, followed by high performance liquid chromatography-diode array detector determination. Parameters affecting VA-µ-SPE such as sorbent amount, desorption solvent, vortex time, desorption time, solution pH and salt concentration were optimized. Under the optimized conditions, linearity of the UV filters was obtained in the range of 5(10)–1000 ng mL −1 , and the correlation coefficient was higher than 0.9959. The limits of detection ranged between 1.5 and 3.2 ng mL −1 and limits of quantification were in the range of 4.2–10 ng mL −1 . The relative standard deviations were in the range of 2.3–7.1%. The recoveries for the spiked real samples were in the range of 90.7–111.3% with relative standard deviation less than 7.2%. It proved to be a fast, accurate and convenient method for extraction of UV filters from different matrices.
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Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-17
·
IF 9.043
Cao Wentao,Ma Chang,Tan Shuo,Ma Mingguo,Wan Pengbo,Chen Feng
An ultrathin and flexible carbon nanotubes/MXene/cellulose nanofibrils composite paper with gradient and sandwich structure was successfully fabricated via a facile alternating vacuum-assisted filtration process.
The composite paper exhibits excellent mechanical property and electromagnetic interference shielding performance.
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-10
·
IF 3.998
Liu Shuanglin,Cheng Xiaodong,Li XiaoFei,Kong Yuanfang,Jiang Shiqing,Dong Chunhong,Wang Guoqing
Catalpol has gained increasing attention for its potential contributions in controlling glycolipid metabolism and diabetic complications, which makes used as a very promising scaffold for seeking new anti-diabetic drug candidates. Acylation derivatives of catalpol crotonate (CCs) were designed as drug ligands of glutathione peroxidase (GSH-Px) based on molecular docking (MD) using Surfex-Docking method. Catalpol hexacrotonate (CC-6) was synthesized using microwave assisted method and characterized by FT-IR, NMR, HPLC and HRMS. The MD results indicate that with the increasing of esterification degree of hydroxyl, the C log P of CCs increased significantly, and the calculated total scores (Total_score) of CCs are all higher than that of catalpol. It shows that CCs maybe served as potential lead compounds for neuroprotective agents. It was found that the maximum Total_score of isomers in one group CCs is often not that the molecule with minimum energy. MD calculations show that there are five hydrogen bonds formed between CC-6 and the surrounding amino acid residues. Molecular dynamics simulation results show that the binding of CC-6 with GSH-Px is stable. CC-6 was screened for SH-SY5Y cells viability by MTT (3-(4, 5-dimethylthiazolyl-2)-2, 5-diphenyltetrazolium bromide) assay, the result indicates CC-6 can effectively reverse SZT induced cells apoptosis with dose-dependent manner, which can indirectly show that CC-6 is a potential neuroprotective agent.
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PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 41
·期 2
·187-193
·
IF 3.815
Bao Han-Yi,Yang Zhao-Fan,Zhao Yan-Jiao,Gao Xiang,Tong Xin-Zhu,Wang Yi-Nuo,Sun Feng-Bo,Gao Jian-Hong,Li Wei-Wei,Liu Zhi-Tian
The recently emerged double-cable conjugated polymers have come into focus due to their significantly improved power conversion efficiencies (PCEs) in single-component organic solar cells (SCOSCs). In this work, the effect of chlorination in double-cable conjugated polymers with linear benzodithiophene backbone and pendant perylene bisimide on the photovoltaic performance in SCOSCs has been studied. After introducing chlorine atoms into conjugated side chains, the highest occupied molecular orbital level of the conjugated polymers is down-shifted, thus resulting in a higher open-circuit voltage. As a result, the chlorinated double-cable conjugated polymer exhibits improved photovoltaic performance from 3.46% to 3.57%.
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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2022
·Vol. 48
·期 7
·8315-8324
·
IF 2.807
Man Huasheng,Chaima Mamoun,Wang Xiangyang,Xiu Lili,Yang Lijun,Huang Jianying
The determination of organophosphorus pesticide (OP S ) residues is of great significance to the evaluation and monitoring of food quality. In this study, nitrogen-, sulfur-, and silicon-co-doped carbon dots (CDs) were prepared from broccoli leaves and stems using a hydrothermal method and applied in fluorescent detection of organophosphorus pesticides. The prepared N-, S- , Si -doped CDs are water-dispersible and hydrophilic with good fluorescent properties. It was found that fluorescence of the prepared CDs could be selectively quenched by Fe 3+ derived from Fe 2+ oxidation by hydrogen peroxide. A linear relationship between the fluorescence of CDs and concentration of Fe 3+ was established in a range of 0 − 200 µM, and its specific detection limit was 1.43 µM. CDs/Fe 2+ /acetylcholinesterase (AChE) fluorescent system was subsequently established to detect and quantify OPs residues in food samples based on the AChE inhibition strategy with a good linear range of 0.01 − 1.0 µM of O , O -dimethyl- O -2,2-dichlorovinyl phosphate (DDVP) concentration. A low detection limit of 8.0 nM was achieved. The hetero-atoms-doped CDs, which could be prepared from agro-wastes on a large scale, have great potential for the rapid real-time detection of OPs in authentic food samples with low detection values.
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IONICS
·
2018
·Vol. 25
·期 6
·2729-2734
·
IF 2.347
Liu Xiao,Zhao Yunxia,Hu Huicong,Du Huiling,Shi Jing
Oxide ion-conducting solid electrolytes are of considerable importance as fuel cell component. Recently, Bi 0.5 Na 0.5 TiO 3 (BNT)-based perovskite-structured oxides become a new hotspot of solid electrolyte since it has potential in oxygen ion conduction. Considerable ionic conductivity is achieved in a Bi deficient or an acceptor doping composition. In this work, the role of Sm content without lone pair electrons substituted for isovalent Bi is studied on the electrical properties of non-stoichiometric (Bi 0.45 Ca 0.04 )Na 0.5 TiO 2.965 (BCNT). In the solid solution range, a transformation from resistive BCNT to dominated oxide ionic conductive process is revealed despite no additional designed vacancies involved. Interestingly, employment of smaller Sm cations by doping favors the plateau formation of dielectric permittivity at higher frequencies. Lone pairs substitution conception and shrinkage of lattice parameters are proposed to be responsible for the anomalous dielectric relaxation.
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WATER AIR AND SOIL POLLUTION
·
2018
·Vol. 229
·期 8
·1-11
·
IF 1.769
Zhang Xiaojun,Ma Xiaoguo,Li Xin,Li Chunying,Wang Rui,Chen Meiqin
Atrazine is one of the most widely used herbicides and has caused much concern about its toxic effects on human and ecosystem. In the present work, a new and efficient method for ultra-trace determination of atrazine in water was developed, using magnetic graphene oxide-based solid-phase extraction combined with dispersive liquid-liquid microextraction, followed by gas chromatography-mass spectrometric determination. The effects of sample pH, contact time, type and volume of elution solvent and extraction solvent, desorption time, and salt addition on the extraction efficiency of atrazine were examined and optimized. Under the optimum conditions, an enrichment factor of 1033 and a detection limit of 0.6 ng L −1 for atrazine were achieved. The developed method was applied to the detection of atrazine in river water, lake water, pond water, and groundwater samples, with spiked recovery of 96–102% and RSD of 2.9–10.5%. Therefore, the proposed method allows proper monitoring of trace atrazine in various environmental waters.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 7
·9640-9649
·
IF 2.478
Ding Xiao,Fan Guang,Huang Yi,Wang Jianguo
Reduced graphene oxide-molybdenum disulfide (RGO-MoS 2 ) loaded Fe 3 O 4 nanoparticles composite (RGO-MoS 2 -Fe 3 O 4 ) is prepared via two-step hydrothermal reaction. RGO-MoS 2 possesses three dimension architecture structures. This structure can prevent RGO and MoS 2 nanosheets restacked together and provide substrates for the Fe 3 O 4 nanoparticle decoration. The sizes of Fe 3 O 4 are in the range of 5–20 nm. As a microwave absorbent: the minimum reflection loss (R L ) value is -47.67 dB at 17.44 GHz when the thickness is only 1.5 mm. The absorption bandwidth (R L < −10 dB) can reach 4.72 GHz with the thickness is 1.7 mm. Compared with the previously reported literature, RGO-MoS 2 -Fe 3 O 4 nanocomposite exhibits excellent microwave absorption performance and can be served as an light-weight microwave absorber.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 29
·22899-22912
·
IF 2.779
Zhang Yinkai,Zhang Xuanhe,Ye Huijian,Xu Lixin
Polymer film capacitor with large power density is potentially embedded in energy suppliers and wearable devices. Currently, the strategy of polymer composite is an effective solution for the enhancement of energy density for dielectric film. Exploring the relation between neighboring interface and polarized response of composite is the primary route for the improvement of energy storage capability in polymer film. In this work, the interface with tailored electrical conductivity has been constructed in carbon-coated BaTiO 3 /poly(vinylidene fluoride-chlorotrifluoroethylene) (BT@C/P(VDF-CTFE)) composite. Core–shell BT@C particles with various calcined crystal structures were synthesized via sol–gel method with following carbonization. The calcination process affects the constitution of graphitic carbon that determines the electrical resistivity of received BT@C particles. The presence of carbon layer on the cubic BT core was evidenced by X-ray photoelectron spectroscopy and transmission electron microscope. BT@C/P(VDF-CTFE) composite with tailored conductive interface was prepared through the solution casting method. The electric displacement of composite is improved due to the interfacial polarization. The electrical resistivity depends on the permeation effect of interfacial carriers, resulting in the decrease of energy efficiency during charge–discharge cycle. The exploration between interface effect and polarization provides insightful prospects on interfacial design of polymer composite for film capacitor.
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JOURNAL OF FLUORESCENCE
·
2011
·Vol. 22
·期 2
·729-736
·
IF 1.966
Li Yan-Yan,Yan Bing,Guo Lei
In this paper, the organic ligands TTA and TAA are grafted onto the coupling agent to achieve the organic precursors (TTA-Si, TAA-Si) as first ligand and the organic 4-(4-nitrostyryl)pyridine (Nspy) is synthesized as the second ligand. Both of them are coordinated to the rare ions with the carbonyl group and nitrogen atom respectively. After the hydrolysis and copolycondensation between the teraethoxysilane (TEOS) and the ternary rare earth organic complex via the sol–gel process, the chemical bonded hybrid materials are constructed and characterized in detail. The obtained hybrid materials present superior thermal stabilities and regular and homogenous square blocks microstructure. Among the hybrids Eu(TTA-Si) 3 Nspy shows a more strong characteristic emission and longer lifetime than the hybrids Eu(TAA-Si) 3 Nspy, while hybrids Tb(TAA-Si) 3 Nspy exhibits the stronger characteristic emission and longer lifetime than the hybrids Tb(TTA-Si) 3 Nspy. For Sm 3+ hybrid materials, the photoluminescence of Sm(TAA-Si) 3 Nspy is too weak to find in the characteristic emission spectra, meanwhile, Sm(TTA-Si) 3 Nspy has the excellent luminescent intensity.
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