Advanced Electronic Materials
·
2018
·Vol. 4
·期 11
·1800237
·
IF 5.466
Xin Wang,Yao Wu,Guanwen Li,Jun Wu,XiaoBing Zhang,Qing Li,Baoping Wang,Jing Chen,Wei Lei
Organometallic perovskites are candidates for low-dose ionizing radiation due to their large mobility-lifetime product, large radiation absorption coefficient, high stability at ambient temperature, and ability to crystallize from solution at low temperatures. However, multiple unstable and expansive organic layers are required to block injected charges from the applied voltage. Here, a radiation photodiode based on p–n junctions formed in the CH 3 NH 3 PbI 3 crystallization process without any other organic layers is reported. Through controlling the location of the dopant, selenium (Se), and its concentration inside CH 3 NH 3 PbI 3 single crystals, the valence band offset of the band alignment is measured as 0 to 0.45 eV. The photodiodes require only two gold electrodes deposited on opposite faces of the CH 3 NH 3 PbI 3 single crystals, and the sensitivity for 60 keV X-ray and 1.25 MeV gamma-ray from Cobalt-60 reached 21 µC mGy air cm −2 and 41 µC Gy air cm −2 , respectively. Experiments measured the ultrafast response time to be 3 µs.
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IEEE SENSORS JOURNAL
·
2018
·Vol. 19
·期 5
·1633-1639
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IF 2.617
Ling Kong,Jie Chen,Zhiwei Chen,Jinhui Feng,Dawei Fan,Qin Wei
A new label-free aptasensor with high visible-light photoelectrochemical (PEC) activity was fabricated for the detection of AFB1 based on N-doped graphene quantum dots (N-GQDs) sensitized Zn-doped SnS2 (Zn-SnS2) nanocomposites. N-GQDs sensitized Zn-SnS2 showed an eminent PEC performance. Ascorbic acid was utilized as an efficient electron donor for scavenging photogenerated holes and inhibiting light driven electron-hole pair recombination. Under the optimum experimental conditions, the specific binding between AFB1 aptamer and AFB1 resulted in the linear decrease of photocurrent with the increase of logarithm of AFB1 concentration in the range of 0.01-20 ng mL-1 with a detection limit of 3 pg mL-1. The constructed N-GQDs sensitized Zn-SnS2 PEC aptasensor exhibited high sensitivity, low cost, and good reproducibility, which is a promising platform for the detection of other important analytes.
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IRANIAN POLYMER JOURNAL
·
2018
·Vol. 27
·期 12
·951-963
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IF 1.278
Gao Jiao,Luo Peng,Yan Xingyan,Hou Linxi
N -Isopropylacrylamide (NIPAM) was successfully grafted on reduced graphene oxide (RGO) by free radical polymerization and characterized by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, transmission electron microscope (TEM) measurements, thermogravimetric analysis and ultraviolet–visible transmission spectroscopy. The synthesized poly( N -isopropylacrylamide)–reduced graphene oxide (PNIPAM–RGO) was used to improve the properties of polysulfone (PSF) membranes with different PNIPAM–RGO weight fractions. The structure and properties of PNIPAM–RGO/PSF membrane were characterized by X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscope, contact angle and tensile testing. The water permeability, self-cleaning recovery rate and water flux decline factor were tested. The blend membrane with 0.4 wt% PNIPAM–RGO possessed the optimal rejection and exhibited an impressive self-cleaning recovery rate and fracture strain of 98.6 and 72.2%, showing a 67.4 and 76.5% enhancement compared to that of pure PSF membrane (58.9 and 40.9%), respectively. Meanwhile, the water flux decline factor decreased from 21.0 to 7.8%. The drastic change of permeability to aqueous solution, observed around lower critical solution temperature of PNIPAM–RGO, proved the thermal sensitivity of the blend membrane. The NIPAM grafted onto RGO by free radical polymerization and utilizing the advantages of both PNIPAM and RGO, which was used as an additive in the membrane, and very hard to lose during the membrane formation and application. The resulting membrane exhibited a significant increase in self-cleaning recovery rate, hydrophilicity, mechanical strength and thermosensitivity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Mengchen Wu,Xianxiang Hu,Congling Li,Jian Li,Haijun Zhou,Xia Zhang,Rui Liu
High-performance non-precious metal-doped carbon catalysts for oxygen reduction reactions (ORR) are viable candidates in lieu of platinum-based catalysts. It has been universally reported that active Co–N sites combined with Fe–N sites embedded in carbon matrix represent the most promising active sites for ORR process. Benefiting from the cage-encapsulated-precursor pyrolysis strategy, herein, we fabricated a Fe–N and Co–N homogeneously doped carbon framework by one step. TEM demonstrated the ultimate product had well-defined morphology with Fe (0.54 at%), Co (0.31 at%) and N (2.94 at%) uniformly distributed into the carbon skeleton. The N 2 absorption-desorption isotherms indicated the MOF-derived catalyst had a high specific surface area of 647.6 m 2 g −1 and inherit hierarchical porosity . Significantly, such FeCo–NC catalyst outperformed a current density (5.6 mA cm −2 ) at 0.70 V (vs reversible hydrogen electrode) 1.18 times higher than that of a commercial 20 wt% Pt/C (5 mA cm −2 ) catalyst in alkaline medium , and more positive peak potential of 0.63 V than its counterparts. Its high cycling stability and immunity towards methanol crossover in a wide range pH value showed good potential to be used as cathodes in proton exchange membrane fuel cells (PEMFCs) for long term operation. This simple synthesis strategy would to some degree leverage a cage-encapsulated-precursor for tailored utility of active sites for ORR in a porous carbon framework.
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NEW CARBON MATERIALS
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2018
·
IF 1.171
Ju-meng Wei,Bi-tao Liu,Xin Zhang,Chang-chun Song
N and S co-doped carbon quantum dots (N, S-CQDs) with a high fluorescence quantum yield (12.6%) were synthesized by a one-pot hydrothermal method. Results indicate that the N, S-CQDs have a small particle size and an amorphous structure, exhibiting unique surface states and excitation wavelength-independent fluorescent properties. Co-doping of N and S increases the electron-transfer rate and improves the coordination interaction between the N, S-CQDs and Hg 2+ ions. The N, S-CQDs show a high sensitivity and selectivity in detecting Hg 2+ ions even for a lake water sample. They are promising fluorescence probes for environmental monitoring.
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ChemPlusChem
·
2018
·Vol. 83
·期 11
·1044-1051
·
IF 3.205
Mengxin Zhang,Dan Wu,Yingxiang Ye,Ling Wu,Zizhu Yao,Xiuling Ma,Lihua Wang,Zhangjing Zhang,Shengchang Xiang
Graphical Same but different : Two isomorphic metal−organic frameworks (MOFs) [FJU-40-H ( a ) and FJU-40-NH 2 ( b )] were used to construct core−shell materials MOF@MOF. This strategy has resulted in an N-doped porous carbon material that displays high catalytic activity for the oxygen reduction reaction (ORR). Here we propose a new strategy in which two isomorphic metal−organic frameworks (MOFs) [FJU-40-H ( a ) and FJU-40-NH 2 ( b )] are used to construct the core-shell material MOF@MOF. This strategy based on nitrogen doping and specific surface has resulted in an N-doped porous carbon (NPC) material in a one-step thermal treatment in N 2 atmosphere; this material displays high catalytic activity for the oxygen reduction reaction (ORR). The materials were analyzed by SEM, XPS, Raman, specific surface area, pore size distribution and electrochemical measurements. It was found that NPC derived from the core-shell MOF@MOF can provide excellent catalytic ORR performance exceeding that of the single MOF. The onset potential is NPC-b@a-4h (−0.068 V)>NPC-a@b-4h (−0.075 V)>NPC-a-4h (−0.109 V)>NPC-b-4h (−0.113 V). Moreover, the results also show that the performance of NPC-b@a (n=4.15) is better than that of NPC-a@b (n=3.32), which means the different nitrogen content of ligands inside and outside of the core affects the ORR properties.
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PubMed
高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Jun Wang,Si Chen,Xiaoyan Cheng,Qi Peng,Wuke Li
Thermo/pH dual-responsive luminescent composites consisting of lanthanide-polyoxometalates and Poly (N-isopropylacrylamide)/Chitosan were synthesized. The dual-responsive nanoparticles are characterized by the FT-IR, UV–vis, TEM , SEM , TGA, DLS and luminescence. The prepared composites exhibit the thermo/pH-responsive properties and the controllable and switchable luminescence in solution in response to the simple changes in temperature and pH values. For instance, the composite hydrogels exhibit intense red luminescence under UV irradiation below 34 °C, and the luminescence become much weaker in solution above 34 °C. Moreover, the hydrogel could not show red luminescence in the buffer solution with low pH value. However, it shows bright red luminescence in neutral and alkaline buffer solution. The possible reasons for controllable luminescence are discussed in the research. The results suggest that the multifunctional nanoparticles could be potentially used in biomedical fields such as luminescent switches, biological labeling and imaging.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Ling Cheng,Yulu Tian,Jingdong Zhang
A p-n heterojunction film of Cu 2 O/α-Fe 2 O 3 was constructed by electrodepositing p-type Cu 2 O microcubes on liquid phase deposited film of n-type α-Fe 2 O 3 . The surface morphology , the crystal phase and composition of Cu 2 O/α-Fe 2 O 3 heterojunction film were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The enhanced absorption in the visible light region was observed in UV–visible diffuse reflectance spectra. Meanwhile, an efficiently improved separation and faster transfer of photogenerated electrons and holes were revealed by photoluminescence spectra and electrochemical impedance spectra. The Cu 2 O/α-Fe 2 O 3 p-n heterojunction was applied to photoelectrocatalytic degradation of oxytetracycline at a bias potential of +0.5 V under visible light illumination. After 60-min photoelectrocatalytic treatment, 73.3% of oxytetracycline was removed and the degradation rate constant reached 2.14 × 10 −2 min −1 . Moreover, the crystal phases and compositions for the used and fresh Cu 2 O/α-Fe 2 O 3 films were studied, and a possible photoelectrocatalytic mechanism was proposed.
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PubMed
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Tingwen Yin,Xiaoguang Zhou,Aiping Wu,Haijing Yan,Qingmao Feng,Chungui Tian
We reported the synthesis of CoP particles embedded in N-doped carbon sheets (CoP/NCS) as an efficient electrocatalyst for water splitting. In the synthesis, Co 2+ ions were firstly coordinated with 8-hydroxy quinoline (8-HQ) to form a sheet-like precursor (Co-HQ). Then, the CoP/NCS was obtained by controllable phosphorization of Co-HQ precursor. The electrochemical test indicated that CoP/NCS can be used as a bifunctional catalyst to catalyze hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1 M KOH. For HER, the CoP/NCS can drive a current density of 10 mA cm −2 (η10) at a low overpotential of 71 mV. The catalyst also shown the good activity for OER with the onset overpotential of 254 mV, and η10 of 313 mV. The cell assembled by using CoP/NCS as both cathode and anode needed a cell voltage of 1.63 V to achieve current density of 10 mA cm −2 . The results also indicated that the catalytic activity of CoP/NCS is related to the suitable conductivity and surface areas. The interaction between carbon sheets and CoP particles is also favorable for improving the performance.
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COMPOSITES COMMUNICATIONS
·
2018
·
IF 0
Yufeng Bai,Zailin Gong,Chunhua Ge,Lixia Wang,Weifang Han,Xiangdong Zhang
This article reports on the fabrication of hybrid boron nitride (BN) grafted with thermoresponsive poly (N-isopropylacrylamide) (PNIPAM) and their self-flocculation effect caused by the thermal phase transition and entanglement behavior of PNIPAM. Compared with the initial BN, the PNIPAM graft BN (BN-PNIPAM) has larger area, pore volume and self-flocculation effect with rapid response to temperature. After grafting, the effective self-flocculation could be acquired in a wide concentration from 0.01 g/L to 10 g/L, the corresponding removal percentage with the phase transition is higher than 95% at high initial concentration. Furthermore, BN has a significant increase in the absorption of hydroquinone after grafting. Thermoresponsive adsorption and self-coagulation will make BN-PNIPAM recyclable in potential water restorations.
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POLYMER
·
2018
·
IF 3.483
Xi-Chuan Li,Chuan-Shan Hu,Hui-Juan Li,Peng-Yun Li,Abdul Haleem,Wei-Dong He
Ring-opening polymerization (ROP) of N-carboxy-α-amino acid anhydride (NCA) of γ-benzyl l -glutamate (BLG) was investigated under frozen condition for the first time. This cryo-ROP was performed in DMSO or 1,4-dioxane below the freezing point of polymerization mixture. The kinetics was monitored with proton nuclear magnetic resonance spectroscopy and gel permeation chromatography , disclosing the well control over molecular weight , living polymerization features and considerable polymerization rate. Compared with the polymerization proceeded at 30 °C, which showed weak linearity regarding the reaction kinetics and relatively broad distribution of molecular weight, the cryo-ROP exhibited excellent first-order kinetics as well as narrow molecular distribution.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 32
·15755-15761
·
IF 9.931
Sainan Luo,Pengcheng Zhang,Tao Yuan,Jiafeng Ruan,Chengxin Peng,Yuepeng Pang,Hao Sun,Junhe Yang,Shiyou Zheng
Spinel lithium titanate (Li4Ti5O12, LTO) is one of the most appealing anode materials for lithium-ion batteries (LIBs) due to its long cycle life and high safety performance. However, its low intrinsic electronic conductivity limits its high rate capability. Herein, we develop a novel one-pot in situ molecular self-assembly approach to prepare a dual N- and anatase-TiO2- modified Li4Ti5O12/C nanorod material (NT-LTO/C). Polypyrrole (PPy), as a pivotal carbon and nitrogen source, is introduced to confine the morphology and particle size of the NT-LTO/C anode. Due to the synergistic effects of the multilevel particle structure, uniform carbon coating, N doping, anatase TiO2 pseudopotential effect and such benefits, the NT-LTO/C electrode delivers a high reversible capacity of 196.3 mA h g−1 at 0.5C, and it maintains 105.5 mA h g−1 even at an ultrahigh rate of 100C with progressive cycling of more than 3000 cycles. In addition, the three electrode pouch full-cell shows much smaller polarization than the pristine one. This novel and facile molecular self-assembly method has broad advanced functional material applications including for ceramics, polymer/carbon-based metal alloys and inorganic non-metallic materials.
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