COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Hui Zhao,Ying Li
Tremella polysaccharide , a novel polysaccharide , not only has good ability of film forming, but also has excellent physiological functions, which was suitable to be used to prepare eco-friendly hydrogels. In this study, a novel pH/temperature responsive micelle-laden hydrogel based on tremella polysaccharide (WSK), carboxymethyl cellulose (CMC) and nonionic surfactant-decyl polyglucoside (C 10 APG) was fabricated through radical polymerization by crosslinking N-isopropylacrylamide (NIPAM), for the purpose to achieve controlled release of hydrophobic drugs indomethacin (IND). Firstly, WSK/CMC/PNIPAM hydrogels were prepared and their characteristics were investigated by FTIR, TGA , SEM, rheological and compressive tests as well as swelling experiments. Then the hydrophobic drug IND molecules were solubilized in C 10 APG micelles which were uniformly dispersed in the WSK/CMC/PNIPAM/C 10 APG networks. Lastly, the IND release behavior of WSK/CMC/PNIPAM/C 10 APG hydrogels was studied, which exhibited both pH and temperature sensitivity. The obtained WSK/C 10 APG-based pH/temperature sensitive hydrogel may have potential in biomedical applications such as drug vehicles and tissue engineering.
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DOI
高影响因子
Nanoscale Research Letters
·
2022
·Vol. 17
·期 1
·1-11
·
IF 5.418
Kadir Aygul,Jamal Ruxangul,Abdiryim Tursun,Liu Xiong,Zhang Hujun,Serkjan Nawrzhan,Zou Dongna,Liu Ya jun
In this work, we successfully assembled an organic–inorganic core–shell hybrid p-n heterojunction ultraviolet photodetector by the electropolymerization deposition of poly(3,4-ethylenedioxyselenophene) (PEDOS) on the surface of zinc oxide nanoarrays (ZnO NRs). The structures of composite were confirmed by FTIR, UV–Vis, XRD and XPS. Mott–Schottky analysis was used to study the p-n heterojunction structure. The photodetection properties of ZnO NRs/PEDOS heterojunction ultraviolet photodetector were systematically investigated current–voltage (I–V) and current–time (I–t) analysis under different bias voltages. The results showed that PEDOS films uniformly grew on ZnO NRs surface and core–shell structure was formed. The p-n heterojunction structure was formed with strong built-in electric field between ZnO NRs and PEDOS. Under the irradiation of UV light, the device showed a good rectification behavior. The responsivity, detection rate and the external quantum efficiency of the ultraviolet photodetector reached to 247.7 A/W, 3.41 × 10 12 Jones and 84,000% at 2 V bias, respectively. The rise time ( τ r ) and fall time ( τ f ) of ZnO NRs/PEDOS UV photodetector were obviously shortened compared to ZnO UV photodetector. The results show that the introduction of PEDOS effectively improves the performance of the UV photodetector.
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高影响因子
RARE METALS
·
2019
·Vol. 40
·期 1
·90-95
·
IF 1.785
Zhu Ying-Gang,Shang Chao-Qun,Wang Zhen-Yu,Zhang Jian-Qiao,Yang Ming-Yang,Cheng Hua,Lu Zhou-Guang
It is a big challenge to prepare non-rare metal and high-activity
electrocatalysts for oxygen reduction reaction (ORR). In this paper, a cobalt/carbon
nanotubes/chitosan composite gel was synthesized and then annealed under nitrogen
atmosphere to yield the cobalt and nitrogen co-modified carbon nanotubes (Co–N-CNTs)
nanocomposite electrocatalysts. In this strategy, the cobalt component considerably
enhanced the ORR activity and improved the degree of graphitic structure to increase the
electronic conductivity. The chitosan served as sustainable source for nitrogen doping.
The Co–N-CNTs exhibit excellent oxygen reduction reaction (ORR) electrocatalytic
activity due to the synergetic effect of Co species and N-doping. The Co–N-CNTs also
deliver excellent methanol tolerance and superior long-term durability to that of
commercial Pt/C, making it a promising ORR electrocatalyst.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 15
·8364-8370
·
IF 14.511
Qiqi Mao,Kai Deng,Wenxin Wang,Peng Wang,You Xu,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
Porous Pd-based metallene with highly curved, ultrathin and porous architectural features is a promising candidate for the hydrogen evolution reaction (HER), and structural design and component modification can effectively enhance its performance. Herein, we present a powerful approach to boost the HER performance of porous PdIr bimetallene through N-doping, which can effectively modulate the electronic structure and induce the strain effect of the designed N-doped porous PdIr bimetallene (N-PdIr bimetallene). The porous N-PdIr bimetallene exhibits superior all-pH HER activity and stability. To generate a cathodic current density of 10 mA cm−2, the required overpotential for the porous N-PdIr bimetallene is 26, 34 and 59 mV in 0.5 M H2SO4, 1 M KOH and 1 M phosphate buffer solution (PBS), respectively, which outperform those of commercial Pt/C. The proposed N-doping approach is a very powerful strategy for boosting metallene electrocatalytic performance, beyond the HER.
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高影响因子
Green Synthesis and Catalysis
·
2022
·
IF 0
Hongwei Li,Yurong Zhang,Jun Tang,Guozheng Huang,Ping Cui,Qingping Ke
Developing highly efficient and recyclable photocatalysts through harvesting solar light as energy is crucial to oxidation for industrial implementation, especially for simple transition metal oxidic catalysts without precious/heavy/rare metal dopants. Herein, we like to report the use of nitrogen-doped CoMn 2 O 4 oxide ( N –CoMn 2 O 4 ) as a heterogeneous catalyst for efficient oxidation of various alcohols such as p / m / o -methyl-substituted aromatic alcohols, p -substituted aromatic alcohols including electron-donating and electron-withdrawing substituents, heterocycle-based alcohols and secondary aromatic alcohols to the corresponding aldehydes/ketones, under visible light (>420 nm) illumination and mild condition of oxygen as oxidant and room temperature. The relation of various Co-based oxides to their catalytic performance was studied. It is shown that the Co 2+ species in N –CoMn 2 O 4 , obviously increased by the doping of nitrogen, are acted as catalytic active species coupled with the synergistic effect between Co and Mn species for the enhanced visible-light selective oxidation of alcohols to aldehydes. A plausible catalytic mechanism is proposed basis of control experiments and published studies, which suggests that this oxidation process probably occurs on Co 2+ sites via an ionic reactive oxygen species pathway and 1 O 2 and O 2 · − species are the reactive oxygen species. This simple transition metal oxide-catalyzed aerobic oxidation provides a green alternative for the manufacture of aldehydes/ketones from alcohols.
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DOI
CARBON
·
2019
·
IF 7.466
Ruilong Cai,Bo You,Min Chen,Limin Wu
N-doped carbon/carbon heterojunction holds huge potential for efficient CO 2 capture. Here, a series of site-specific N-doped core-shell carbon spheres with carbon/carbon heterojunction were successfully prepared by carbonization of polypyrrole coated hypercrosslinked polystyrene spheres, followed by chemical activation with KOH. These activated carbon spheres possessed large specific surface area (2080 m 2 g −1 ) and abundant micropores (0.45 cm 3 g −1 ). Despite their low nitrogen content (0.96 wt%), the CO 2 adsorption capacities of activated samples reached 3.69 and 5.80 mmol g −1 measured at 298 and 273 K, respectively, under atmospheric pressure (1 bar). More significantly, the N-doped carbon/carbon heterojunction contributes to a stronger and denser CO 2 packing in this system.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Peng Juan,Junmei Liang,Tao Chen,Qicheng Zhang,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
MoS2 and its derivates have been regarded as a promising catalyst for the hydrogen evolution reaction (HER), and their edge sulfur sites are key factors for the HER performance. Here, we develop a facile strategy to grow nonstoichiometric molybdenum sulfide (MoSx) with more active sulfur sites on porous N-doped graphene (MoSx@CN). Experiments demonstrate that the introduction of porous N-doped graphene not only facilitates the fast transfer of charge and the efficient infiltration of the electrolyte but the N dopants could be used as the nucleation sites for MoSx to possess more active bridging S22– sites. Consequently, the obtained MoSx@CN catalyst possesses an outstanding HER activity, which shows an overpotential of 256 mV at 100 mA cm–2 with a Tafel slope of 49 mV dec–1. This study provides a new strategy to optimize transition metal dichalcogenide-based catalysts for energy-related applications.
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 22
·225204
·
IF 3.874
Yali Liu,Xiaoxiang Wu,Wenxuan Guo,Mengge Li,Xinyue Niu,Jiadong Yao,Ying Yu,Boran Xing,Xiaoyuan Yan,Shucheng Zhang,Jian Sha,Yewu Wang
Heterojunction integrated by two-dimensional/three-dimensional materials has shown great potential applications in optoelectronic devices because of its fast response speed, high specific detectivity and broad spectral response. In this work, the vertical n-Si/p-GaTe heterojunction has been designed and fabricated, which shows a high responsivity up to 5.73 A W−1 and a fast response time of 20 μs at zero bias benifitting from the high efficiency of light absorption, internal photocurrent gain and strong built-in electrical field. A specific detectivity of 1012 Jones and a broad spectral response ranging from 300 to 1100 nm can also be achieved. This work provides an alternative strategy for high-performance self-powered optoelectronic devices.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·B1491
·
IF 3.12
Xiaoying Liu,Wenbin Li,Tianqin Zeng,Silu Zhang,Bijing Zhou,Muyi Li,Peng Zhao,Chang Peng
Heteroatom doped carbon materials have attracted intense attention in constructing electrochemical sensors because of their outstanding electrocatalytic performance. Up to now, most of the researches were focused on the electrochemical application of single heteroatom doped carbon microspheres. In this work, N, P-co-doped carbon microspheres (NP-CMs) modified electrode was developed as highly sensitive electrochemical sensor for acetaminophen. NP-CMs were acquired by the calcination of products from the one-pot reaction of dopamine and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Experimental results revealed that NP-CMs showed better electrocatalytic performance compared with N-doped carbon microspheres. Under the optimal conditions, the response of NP-CMs/GCE showed a linear relationship with acetaminophen concentration from 0.07 μM to 30 μM, the linear equation was Y = 0.01356X+0.7417 and the detection limit was 40 nM (S/N = 3). The recoveries of the NP-CMs modified GCE for the assay of acetaminophen in human serum samples were from 94.0% to 106.0%. It was believed that N, P-co-doped carbon microspheres have a great potential in the design of novel pharmaceutical analysis methods.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 40
·
IF 1.768
Junjie Yuan,Yunbo Zhang,Zhengzhou Wang
A new type of crosslinked poly (n-butyl acrylate) (PBA)/silica core-shell nanocomposite particles was adopted as toughening agent to improve the mechanical properties of phenolic foams. The effects of the nanocomposite particles on the structures and properties of lightweight phenolic foams were investigated. SEM result showed that the addition of a small quantity of the nanocomposite particles can significantly enhance the structural homogeneity of phenolic foams. Thermalgravimetric analysis result suggested that the incorporation of the nanocomposite particles did not affect the thermal stability of the toughened phenolic foams. The flexural strength, compressive strength, and elastic modulus of the phenolic foams increased distinctively after the addition of the nanocomposite particles, the maximum values of which increased by 36.0%, 42.9%, and 32.3%, respectively. In this study, the optimum dosage of the nanocomposite particles is 0.03 phr in the modified phenolic foams. Moreover, the influence on the flammability of phenolic foams by toughening can almost be neglected. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42590.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 28
·期 18
·1706018
·
IF 12.124
Shulin Zhao,Meng Li,Min Han,Dongdong Xu,Jing Yang,Yue Lin,Nai-En Shi,Yanan Lu,Rui Yang,Bitao Liu,Zhihui Dai,Jianchun Bao
Owing to their unique optical, electronic, and catalytic properties, metal nitrides nanostructures are widely used in optoelectronics, clean energy, and catalysis fields. Despite great progress has been achieved, synthesis of defect-rich (DR) bimetallic nitride nanocrystals or related nanohybrids remains a challenge, and their electrocatalytic application for oxygen evolution reaction (OER) has not been fully studied. Herein, the DR-Ni 3 FeN nanocrystals and N-doped graphene (N-G) nanohybrids (DR-Ni 3 FeN/N-G) are fabricated through temperature-programmed annealing and nitridation treatment of NiFe-layered double hydroxides/graphene oxide precursors by controlling annealing atmosphere. In the nanohybrids, the DR-Ni 3 FeN nanocrystals are anchored on N-G, and mainly show twin crystal defects besides ≈10% of stacking faults. Such nanohybrids can efficiently catalyze OER in alkaline media with a small overpotential (0.25 V) to attain the current density of 10 mA cm −2 and a high turnover frequency (0.46 s −1 ), superior to their counterparts (the nearly defect-free Ni 3 FeN/N-G), commercial IrO 2 , and the-state-of-art reported OER catalysts. Except for the superior activity, they show better durability than their counterparts yet. As revealed by microstructural, spectroscopic, and electrochemical analyses, the enhanced OER performance of DR-Ni 3 FeN/N-G nanohybrids originates from the abundant twin crystal defects in Ni 3 FeN active phase and the strong interplay between DR-Ni 3 FeN and N-G.
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高影响因子
ELECTROANALYSIS
·
2019
·Vol. 31
·期 4
·711-717
·
IF 2.691
Meiling Wang,Laijin Zhong,Mingzhu Cui,Weifeng Liu,Xuguang Liu
This study develops a novel approach to morphology-controlled N-doped porous carbons (NPC) derived from supramolecular crosslinked polypyrrole hydrogel (PPy-gel) with tetra-functional tetrakis(4-carboxyphenyl)porphyrin as dopant and cross-linker. Both optimized PPy-gel and NPC realize acetaminophen determination at nanomolar level, displaying record-low respective detection limits of 3.0 and 1.0 nM (S/N=3). The optimized NPC demonstrates necklace-like structure with more edge pyridinic N, revealing better electronic conductivity and higher electrochemically active surface area, and consequently higher sensitivity and selectivity. Even in the presence of three interferences (ascorbic acid, dopamine and uric acid), NPC based electrochemical sensor also shows the ultra-low detection limit (1.2 nM). The promising application potential of the sensor is proved by the high consistence between measurements in pharmaceutical sample and established acetaminophen standard curve. Moreover, the determination results of acetaminophen in human urine sample obtained by this sensor were in a good agreement with the reference values assayed by HPLC.
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高影响因子
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