Nano-Micro Letters
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2020
·Vol. 12
·期 1
·1-19
·
IF 12.264
Huang Linsheng,Zhou Xiaowen,Xue Rui,Xu Pengfei,Wang Siliang,Xu Chao,Zeng Wei,Xiong Yi,Sang Hongqian,Liang Dong
Nanoscale multi-dimensional heterojunctions in situ grow at the edge of two-dimensional MXene conductive network.
A controlled anneal procedure in 150 °C is for preparing anatase TiO 2 /SnO 2 heterojunctions with oxygen vacancy scramble effect.
The perovskite solar cells achieve high power conversion efficiency and high moisture-resistance stability.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 5
·3899-3909
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IF 2.22
Tian Chen,Zhou Min,Hua Zhongqiu,Yuan Wenjing,Wu Yi,Tian Xuemin,Song Tao
In the present work, gas sensors based on Cr 2 WO 6 nanoparticles were fabricated by a screen-printing technique, and the sensing properties were characterized with acetone and other typical reducing gases under both dry and humid air backgrounds. Interestingly, it was found that Cr 2 WO 6 sensors showed a p-type conduction characteristic with a highly sensitive response to acetone vapor in a relatively low concentration. In the presence of humidity, resistances of Cr 2 WO 6 sensors were significantly increased; nevertheless, sensor responses were obviously inhibited. In addition, the basic sensing mechanism of Cr 2 WO 6 sensor was also investigated based on oxygen adsorption behavior and catalytic properties of Cr 2 WO 6 surface. According to experimental results, it is proposed that the resistive responses of Cr 2 WO 6 sensor to reducing gases were highly oxygen-dependent, indicating that the surface oxygen adsorption and reaction also played the basic role in the sensing process as that observed in typical n-type MOS sensors. Additionally, sensors also suffered from a high cross-sensitivity to water vapor due to the competition of chemisorption of water and oxygen on the surface of Cr 2 WO 6 .
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Nature Communications
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2020
·Vol. 11
·期 1
·1-7
·
IF 12.121
Liu Xu,Xu Wen Wu,Huang Xinyu,Wang Endong,Cai Xiao,Zhao Yue,Li Jin,Xiao Min,Zhang Chunfeng,Gao Yi,Ding Weiping,Zhu Yan
The discovery of atomically precise nanoclusters is generally unpredictable, and the rational synthesis of nanoclusters guided by the theoretical design is still in its infancy. Here we present a de novo design of Au 36 (SR) 24 nanoclusters, from theoretical prediction to experimental synthesis and characterization of their physicochemical properties. The crystal structure of an Au 36 (SR) 24 nanocluster perfectly matches the simulated structural pattern with Au 4 tetrahedral units along a two-dimensional growth. The Au 36 (SR) 24 nanocluster indeed differs from its structural isomer whose kernel is dissected in an Au 4 tetrahedral manner along a one-dimensional growth. The structural isomerism in the Au 36 (SR) 24 nanoclusters further induces distinct differences in ultrafast electron dynamics and chirality. This work will not only promote the atomically precise synthesis of nanoclusters enlightened by theoretical science, but also open up exciting opportunities for underpinning the widespread applications of structural isomers with atomic precision.
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INFLAMMATION
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2020
·Vol. 43
·期 5
·1634-1648
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IF 3.212
Yue Shuwen,Xue Ning,Li Honglei,Huang Baosheng,Chen Zhen,Wang Xing
Apigenin, a flavonoid found in many plants, has various biological properties. We aimed to investigate the anti-inflammatory and anti-oxidative activity of apigenin against carbon tetrachloride (CCl 4 )-induced acute liver injury in mice and hydrogen peroxide (H 2 O 2 )-induced oxidative stress in HepG2 cells and possible mechanism. In vivo , apigenin significantly reduced alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activity in serum of mice challenged by CCl 4 and markedly alleviated the lipid peroxidation as indicated by the increased level of superoxide dismutase (SOD), reduced glutathione (GSH), glutathione peroxidases (GSH-Px) and catalase (CAT), and the decreased malondialdehyde (MDA) in liver tissue. Apigenin also ameliorated inflammation by downregulating tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), and upregulating IL-10. Consistently, the elevated ALT and AST level; the impaired balance between SOD, GSH activity, and excessive ROS; and the increased gene expression of TNF-α and IL-6 resulting from H 2 O 2 -induced oxidative stress were restored by apigenin. Moreover, the results from Western blot, real-time qPCR, and immunofluorescence assay indicated that apigenin enhanced the activity of TNF receptor-associated factor (TRAF) 2/3 and cellular inhibitor of apoptosis protein (c-IAP) 1, ameliorated NF-κB-inducing kinase (NIK), and mediated the nuclear translocation of NF-κB2, therefore had an inhibitory effect on the non-canonical NF-κB pathway which was activated in both models. siNIK canceled the protective effect of apigenin on H 2 O 2 -induced HepG2 cells. Altogether, our results demonstrated that apigenin mitigated liver injury by ameliorating inflammation and oxidative stress through suppression of the non-canonical NF-κB pathway, indicating the potential of apigenin for treatment of the liver injury.
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MICROCHIMICA ACTA
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2020
·Vol. 187
·期 6
·1-9
·
IF 6.232
Wang Baogang,Liang Zhu,Tan Hui,Duan Wenmeng,Luo Mina
Carbon dots (CDs) emitting red fluorescence (610 nm) were synthesized by solvent thermal treatment of p-phenylenediamine in toluene. Upon 440 nm excitation, quercetin (QCT) alone endowed slight effects on the red fluorescence of CDs. Once Zn 2+ was further introduced, the QCT-Zn 2+ complex was quickly formed. This complex absorbs excitation light and emits bright green fluorescence at 480 nm. The red fluorescence of CDs was greatly quenched owing to the inner-filter effect. The ratio of fluorescence intensity at 480 nm and 610 nm (I 480 /I 610 ) gradually increases with increasing concentration ( c ) of Zn 2+ . Al 3+ exhibits the same phenomen like Zn 2+ . Fluoride ions form a more stable complex with Al 3+ than QCT-Al 3+ complex but have a negligible effect on the QCT-Zn 2+ complex. The possible interference of Al 3+ on Zn 2+ can thus be avoided by adding certain amount of F − . The CD-QCT-F − system was constructed as a ratio-metric fluorescent nanoprobe toward Zn 2+ with determination range of 0.14–30 μM and limit of detection (LOD) of 0.14 μM. Due to the stronger affinity of adenosine triphosphate (ATP) to Zn 2+ than QCT, the I 480 /I 610 value of CD-QCT-F − -Zn 2+ system gradually decreases with increasing c ATP . The ratiometric fluorescent nanoprobe toward ATP was established with detection ranges of 0.55–10 and 10–35 μM and a LOD of 0.55 μM. The above two probes enable the quantitative determination of Zn 2+ and ATP in tap and lake water samples with satisfactory recoveries.
Schematic representation of the ratiometric fluorescent nanoprobes based on the carbon dots (CDs)-quercetin (QCT) system towards Zn 2+ and adenosine triphosphate (ATP) with high selectivity and sensitivity.
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-10
·
IF 12.121
Zhang Yan,Wan Fang,Huang Shuo,Wang Shuai,Niu Zhiqiang,Chen Jun
Self-charging power systems integrating energy harvesting technologies and batteries are attracting extensive attention in energy technologies. However, the conventional integrated systems are highly dependent on the availability of the energy sources and generally possess complicated configuration. Herein, we develop chemically self-charging aqueous zinc-ion batteries with a simplified two-electrode configuration based on CaV 6 O 16 ·3H 2 O electrode. Such system possesses the capability of energy harvesting, conversion and storage simultaneously. It can be chemically self-recharged by the spontaneous redox reaction between the discharged cathode and oxygen from the ambient environment. Chemically self-recharged zinc-ion batteries display an initial open-circuit voltage of about 1.05 V and a considerable discharge capacity of about 239 mAh g −1 , indicating the excellent self-rechargeability. Impressively, such chemically self-charging zinc-ion batteries can also work well at chemical or/and galvanostatic charging hybrid modes. This work not only provides a route to design chemically self-charging energy storage, but also broadens the horizons of aqueous zinc-ion batteries.
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高影响因子
Scientific Reports
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2020
·Vol. 10
·期 1
·1-10
·
IF 3.998
Ma Huiyan,Chen Yu,Chen Jinhui,Zhang Yunqiu,Zhang Tian,He He
Mikania micrantha and Ipomoea cairica are two invasive plants widely distribute and seriously damage in Hainan island. In this study, the leaves extracts of two weeds were collected and determined for their allelopathic potentials on Chrysanthemum coronarium . The phytotoxicity bioassay showed that when the extract concentration was 50 and 100 mg/ml, the inhibited effects of M. micrantha on growth of C. coronarium were greater than by I. cairica . However, when the extract concertation at 400 mg/ml, the opposite inhibited effects were observed. We speculated this phenomenon was caused by different allelopathic compounds. Therefore, using gas chromatography–mass spectrometry, 19 and 23 compounds were identified respectively, benzoic acid and cinnamic acid were the main components in the two leaves extracts, which were selected to carry out the further bioassays. Subsequent bioassay results showed the effects of two allelochemicals on morphological index and chlorophyll content and POD activity were all negative to C. coronarium , whereas the content of MDA and activity of SOD, CAT represented adverse changes. Moreover, the inhibitions by cinnamic acid were generally greater than those by benzoic acid. Thus, the phenolic acids played the most crucial roles in the allelopathic effccts of M. micrantha and I. cairica leaves extracts.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-8
·
IF 6.232
Yao Wenyan,Shi Jian,Ling Jiang,Guo Yadong,Ding Chensen,Ding Yanjun
Aptamer-modified SiC quantum dots (DNA-SiC QDs) as fluorescent aptasensor are described for the determination of Proteus mirabilis . The SiC QDs were synthesized through one-pot hydrothermal method with particle sizes of about 14 nm. The amino-modified aptamers against P. mirabilis were conjugated to the surfaces of SiC QDs for bacteria recognition . The aptamer with an affinity for target protein can bound to P. mirabilis and this causes a decrease in the fluorescence intensity of DNA-SiC QDs. P. mirabilis levels were tested by the aptasensor within 35 min with fluorescence excitation/emission maxima at 320/420 nm. The linear range is from 10 3 to 10 8 CFU mL −1 and the limit of detection is 526 CFU mL −1 ( S / N = 3). The aptasensor was used for determination of P. mirabilis in pure milk samples and obtained good accuracy (87.6–104.5%) and recovery rates (85–110.2%) were obtained. The detection in simulated forensic identification samples (pure milk, milk powder, blood, and urine) obtained gave satisfactory coincidence rates with the method of bacterial isolation and identification as standard. These results demonstrate that the fluorescent aptasensor is a potential tool for identification of P. mirabilis in forensic food poisoning cases.
Determination of P. mirabilis is based on SiC QDs fluorescence aptasensor. The SiC QDs with plentiful carboxyl groups on the surface can be synthesized via one-pot hydrothermal route. After activated by EDC/NHS, the SiC QDs can bind to aptamer to form fluorescence aptasensors. When the target P. mirabilis exists, the fluorescence of aptasensor will be quenched and the determination of the P. mirabilis based on the fluorescence change can be analyzed.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12789-12800
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IF 3.553
Han Jie,Jiang Weitao,Zhang Hongjian,Zhang Yajun,Feng Xueming,Wang Lanlan,Niu Dong,Lei Biao,Liu Hongzhong
There is a growing interest in the design and fabrication of small-scale soft actuators and robotics, especially the realization of functionalities mimicking biological systems with biomimetic motions in response to external stimuli. However, the mobility and self-weight are still the critical challenges for further improvement and broader application of soft actuators. It is attractive to develop untethered and ultra-light small-scale robotics by integrating the actuators and drivers while achieving the ability to respond to external stimuli. Inspired by the spiders that rely on electrostatic forces in the environment to stay airborne by their ballooning silk, a positively charged fiber-paper structure-based soft actuator is proposed. Utilizing electrospinning of tetraethyl orthosilicate (TEOS) solution, this ultra-light soft actuator can realize the movement of bending and high-frequency vibration with the stimuli of electrostatic force in the electric field. Programmable motions, i.e., continuous bending with a series of angles, variable frequency vibration, can be realized by regulating the external electric field. The 3D fluffy structure of the silica micro-nanofibers and the paper-based structure endow the soft actuator with ultra-lightweight and excellent flexibility. The untethered, ultra-light soft actuator suggests a feasible approach to develop ultra-light, soft and autonomous robotics and holds promise in reconnaissance and environmental detection. Graphic abstract
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CHEMICAL PAPERS
·
2020
·Vol. 74
·期 11
·3987-3993
·
IF 1.68
Pan Binfeng,Zhang Zhimin,Lu Xuchen
Abstract The reaction between rare earth oxychloride (REOCl) and water was investigated. X-ray diffractometer, volumetric titrations, FTIR spectrograph and scanning electron microscope were used to determine the reaction process and the reaction products. It was found that the reaction could be concluded as follows: 5REOCl(s) + 5H 2 O(l) = 2RE 2 (OH) 5 Cl(s) + RE 3+ (aq) + 3Cl − (aq). Based on this reaction, a new method for determining the purity of anhydrous rare earth chloride was proposed. Compared with the conventional method, the maximum absolute error decreased from 22 to < 1% and the maximum relative error decreased from 111 to < 4% under the experimental conditions. Graphic abstract
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-10
·
IF 3.998
Qu Zixiang,Meng Xia,Duan Hongdong,Qin Dawei,Wang Lizhen
A highly effective method for the research and development of a novel macroscopic hydrogel sensor and bilayer hydrogel is reported. Based on Rhodamine 6G, an Hg 2+ sensitive fluorescent functional monomer was synthesized, then the monomer was utilized to synthesize hydrogel sensors and bilayer hydrogels. Hydrogel sensor has prominent selectivity to Hg 2+ , the bilayer hydrogel has shape changing function additionally. By combining a thermoresponsive hydrogel layer, poly N-isopropylacrylamide (PNIPAM), with an Hg 2+ selective hydrogel layer via macroscopic supramolecular assembly, a bilayer hydrogel is obtained that can be tailored and reswells. The bilayer hydrogel sensor can show complex shape deformation caused by the PNIPAM layer and the Hg 2+ -responsive characteristic of hydrogel sensor layer can be observed under visible light or UV light. This work will provide novel insights for the design and synthesis of novel smart materials with synergistic functions.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 19
·8170-8184
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IF 3.553
Duan Guangyu,Cao Yutong,Quan Jiayou,Hu Zuming,Wang Yan,Yu Junrong,Zhu Jing
This paper reports that a novel polyimide dielectric composite with three-dimensional (3D) thermally conductive networks and enhanced breakdown strength was firstly fabricated by filling with core-double-shell structured F-BA fillers. The F-BA particles were composed of nano-sized boron nitride (nBN) and polydopamine-coated spherical alumina (PDA@Al 2 O 3 ). Moreover, to ameliorate interfacial compatibility between F-BA fillers and PI matrix as well as restrain phonons scattering during propagation, 1,6-Diisocyanatohexane (HDI) was innovatively used as “bridge agent” to connect and functionalize nBN and PDA@Al 2 O 3 particles to generate core-double-shell structure. The results revealed that breakdown strength of PI dielectric composite with 25 wt % F-BA fillers was increased to 146.3 MV·m −1 , showing an increment of 68.5% in comparison with that of pure PI. Furthermore, the thermal conductivity of F-BA/PI composite with 25 wt % F-BA fillers increases to 6.41 W/m·K of in-plane direction and 1.01 W/m·K of through-plane direction, respectively, which shows 36 and 6 times higher than polyimide of 0.18 W/m·K. For dielectric properties of F-BA/PI composite, the dielectric constant and loss are less than 3.5 and 0.02, respectively. Considering these properties, the prepared PI dielectric composite shows potential application in high-performance electronic devices.
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