ANALYTICAL CHEMISTRY
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2018
·
IF 6.042
Guiqiang Pu,Dongxu Zhang,Xiang Mao,Zhen Zhang,Huan Wang,Xingming Ning,Xiaoquan Lu
We provide here, for the first time, a new interfacial electron-induced electrochemiluminescence (IEIECL) system, realizing bionic construction of bioluminescence (BL) by exploiting electrochemiluminescence (ECL) and ITIES (the interface between two immiscible electrolyte solutions). Significantly, the superiority of the IEIECL system is embodied with the solution of the two bottlenecks encountered in the conventional ECL innovation: that are (a) the applications of hydrophobic luminophores in more commonly used aqueous solution are inhibited tremendously due to the poor inherent solubility and the instability of radicals and (b) the analytes, insoluble in water, are hard to be discovered in an aqueous system because of too little content. More productive IEIECL radiation, analogous to BL, originates from the triplet excited state porphyrin in comparison to the homogeneous ECL. The mechanism of IEIECL, as well as the interaction mechanism between IEIECL and charge transfer (comprising electron transfer (ET), ion transfer (IT), and facilitated ion transfer (FIT)) at the ITIES, are explored in detail. Finally, we emphasize the actual application potential of the IEIECL system with the detection of cytochrome c (Cyt c); it is a key biomolecule in the electron transport chain in the process of biological oxidation and is also an intermediate species in apoptosis. Potentially, the IEIECL system permits ones to explore the lifetime and diffusion path of free radicals, as well as imparting a possibility for the construction of a bionic sensor.
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高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2019
·Vol. 36
·期 3
·1800403
·
IF 4.194
Yuanjie Xu,Chaochao Li,Huihan Huang,Lei Huang,Luming Peng,Haibo Pan
The selective degradation of specific substances in mixed contaminants is quite challenging. And a general approach for sensitized oxide semiconductor relies on dip-coating method with sensitizer. Here, hydrophilic 2D, nest-like architecture ZnO (ZnO NA) was hydrophobicly functioned by monomolecular–layer tetraphenylporphyrin zinc (ZnTPP), where ZnTPP was synthesized by means of an in situ center-substituted (ISCS) process., i.e., the hydrogen atoms in the core of metal-free tetraphenylporphyrin (H 2 TPP) are substituted by the unsaturated zinc ions in ZnO NAs. ZnTPP/ZnO NA was exhibited with significant hydrophobicity, benefitting to absorb hydrophobic phenol (PL). Further, it is realized to selectively photodegradate PL in the mixture by ZnTPP/ZnO NAs under visible irradiation. Note that the rate of degradation to hydrophobic PL by ZnTPP/ZnO NA is 9.17 times of that for ZnO NA within 150 min; on the contrary, the degradation rate of hydrophilic rhodamine B (RhB) by ZnTPP/ZnO is reduced by 40%. Radiative lifetime of photogenerated charges is obviously increased by ZnTPP/ZnO NA compared with that of ZnTPP, indicating the effective charge separation for ZnTPP/ZnO NAs. In addition, ZnTPP/ZnO NA produced more superoxide radicals (·O 2 − ) in comparison to ZnO NA. With surface functionalization, the feasibility of selective photocatalysis under visible irradiation is demonstrated.
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高影响因子
TALANTA
·
2018
·
IF 4.244
Jing Bao,Changjun Hou,Yanan Zhao,Xintong Geng,Mickey Samalo,Huisi Yang,Minghong Bian,Danqun Huo
In present study, a sensitive and effective electrochemical microRNA (miRNA) sensing platform is successfully developed by integrating gold nanoparticles/polypyrrole-reduced graphene oxide (Au/PPy-rGO), catalyzed hairpin assembly (CHA) and hybridization chain reaction (HCR) multiple signal amplification strategy. Firstly, Au/PPy–rGO was employed onto a bare GCE by electrodeposition that can greatly enhanced conductivity and effectively immobilize probes. Then, the thiolated capture probes (SH-CP) were self-assembled on the Au/PPy–rGO modified GCE via Au-S bond. The target miRNA triggered the dynamic assembly of the two hairpin substrates (H1 and H2), leading to the cyclicality of the target miRNA and the formation of H1–H2 complexes without the assistance of enzyme. Subsequently, the newly emerging DNA fragment of H2 triggered the HCR when a mixture solution (hairpins H3 and H4) and produced dsDNA polymers. Finally, a substantial amount of methylene blue (MB) as signal indicator was intercalated into the minor groove of the long dsDNA polymers to achieve detected electrochemical signal. The fabricated sensor is able to detect miRNA-16 (model target) with concentration range from 10 fM to 5 nM with a low detection limit (LOD) of 1.57 fM (S/N = 3). Current research suggests that the developed multiple signal amplification platform has a great potential for the applications in the field of biomedical research and clinical analysis.
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高影响因子
ELECTROANALYSIS
·
2018
·Vol. 30
·期 9
·2035-2043
·
IF 2.851
Shuangyan Liu,Lei Wang,Guoyi Duan,Linan Wang,Zia Ul Haq Khan,Yanzhi Sun,Yongmei Chen,Pingyu Wan
To improve the performance of dopamine (DA) detection in the presence of ascorbic acid (AA) and uric acid (UA), sodium diphenylamine sulfonate/polypyrrole/multi-walled carbon nanotubes (SDPAS/PPy/CNTs) film was fabricated on the surface of gold electrode through one-pot polymerization initiated by electrochemical oxidation. SDPAS were covalently embedded into the backbone of PPy to endow the resultant film with numerous negative-charged terminals, resulting in selective pre-adsorption of protonated DA + on the electrode and switching the following anodic reaction to be an adsorption-controlled process. The detection of DA in the presence of AA and UA by square wave voltammetry method showed an outstanding repeatability with the relative standard deviation of 0.45 %. A good linear relationship was observed between the oxidative peak current and the concentration of DA in the range of 0.827–104 μM (R 2 =0.993), and the limit of detection (LOD) was calculated to be 0.105 μM (S/N=3).
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 7
·A1515
·
IF 3.662
Qifan Liu,Limin Zang,Chao Yang,Chun Wei,Jianhui Qiu,Chanjuan Liu,Xu Xu
A flexible and knittable symmetric all-solid-state fiber supercapacitor (ASSFS) was fabricated by using two polypyrrole (PPy) microcone arrays coated stainless steel yarns (SSY) as fiber electrodes and current collectors. The microcone arrays and interconnected network structure of PPy could increase transport path for ions/electrons and enlarge the real contact area between PPy and electrolyte, leading to superior specific capacitance. In addition, the fiber electrode has a high tensile strength of ∼1200 MPa and elongation at break is 12.5%. The outstanding mechanical performance of the fiber electrode is attributed to the high mechanical properties of the SSY and the protection of PPy coating. The resultant ASSFS exhibits maximum specific capacitance of 42.7 F/cm3, energy density of 3.8 mWh/cm3 and power density of 388 mW/cm3 (normalized to the whole device). The specific capacitance maintains 100% at different bending angles and 93.5% of its initial value after 1000 bending cycles. As a demonstration, a fabric and a bracelet knitted with five ASSFSs connected in series can light a LED.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 24
·6416-6422
·
IF 5.976
Taoping Wang,Mingtong Li,Hui Zhang,Yunyu Sun,Bin Dong
Smart actuators have recently been widely studied due to their potential applications in the fields of wearable devices, artificial muscles and microrobots. However, it is still challenging to develop smart actuators with a fast response time, large deformation, multi-stimuli response ability and programmable shape-changing capability. Here, we report a novel smart actuator, which consists of polypyrrole and agar. Due to the water absorbing ability, the photothermal effect and the protonation behavior originating from polypyrrole and agar, the resulting actuator is responsive to a variety of stimuli, including humidity, light, temperature, HCl and NH3 gas. In addition, the actuator exhibits fast responsiveness, controllable actuation and large bending. Interestingly, two external stimuli can be combined to activate the actuator, leading to continuous shape changes in a programmable fashion. Multi-stimuli responsive actuators have opened up great opportunities in a variety of applications. As a proof-of-concept, we have demonstrated their application as a walking device with cargo transportation and delivery capabilities.
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高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Li Liu,Qingyong Tian,Weijing Yao,Mengxiao Li,Yongwei Li,Wei Wu
Increasing demands for portable and wearable electronics have stimulated considerable efforts to develop ultraflexible, stretchable and high-power supercapacitors . Existing stretchable supercapacitors are characterized by poor energy density , low stretchability and cumbersome fabrication process limit its practical application. How to enhance the energy densities and stretchability while simplify the fabrication process is a critical challenge for achieving the high-performance stretchable supercapacitors. Herein, we propose a simple and efficient fully-printing approach to manufacture the stretchable asymmetric supercapacitors, the functional layers are directly printed onto stretchable textile substrates in the order of silver current collector, cathode electrode, anode electrode and gel electrolyte. To the best of our knowledge, all-printed ultraflexible and stretchable asymmetric supercapacitors with ultrahigh energy density are first fabricated from two kinds of functional screen printing inks. The stretchable asymmetric supercapacitors using Ag@PPy@MnO 2 cathode electrode and activated carbon anode electrode display an ultra-high energy density of 0.0337 mW h cm −2 at a high power density of 0.38 mW cm −2 . In addition, its capacitance retention reaches 90.8% after 5000 cycles and 86.2% after 40% stretching strain. Furthermore, these asymmetric supercapacitors exhibit ultra-flexibility and mechanical stability at severely flexible states (including stretching, twisting, crimping and winding), and a red LED (2.8 V) is stable alight and powered by tandem asymmetric supercapacitors.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 16
·13319-13328
·
IF 3.201
Xuesong Gu,Shubo Xie,Qiang Chen,Shufeng Chen,Haiying Zhao,Zhanxi Bian
Two series of novel ferrocene-based porphyrins and their transition metal (Zn, Co, Ni, and Cu) complexes were synthesized and characterized. One has ferrocene on the skirt of meso-tetraphenylporphyrin (TPP) via long chain alkoxy groups (HP1 and HP2); the other has a close connection of TPP and ferrocene containing long chain alkyl groups by ester linkage (HP3). Their UV-visible absorption spectra, fluorescence spectra, thermal stability and electrochemical properties were investigated. They were applied for the first time as burning rate catalysts (BRCs) in a simulative solid propellant to overcome the migration problem. Their catalytic effects on the thermal degradation of ammonium perchlorate (AP) were evaluated by thermogravimetric and differential scanning calorimetry techniques, and the results showed that the catalytic effects of free porphyrin, Zn(II) porphyrin and Ni(II) porphyrin were similar to that of catocene. While Cu(II) and Co(II) porphyrins exhibited higher catalytic effects than catocene, the Co(II) complexes lowered the thermal decomposition temperature of AP more dramatically compared with Cu(II) complexes. What's more, these compounds displayed non-migratory ability in the migration test. Therefore, the novel ferrocene-based porphyrin derivatives are non-migratory BRCs with high catalytic efficiency for composite solid propellants and have potential applications in aerospace.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Zhipeng Liao,Xiaofeng Fang,Jiansheng Li,Xin Li,Wuxiang Zhang,Xiuyun Sun,Jinyou Shen,Weiqing Han,Shuaifei Zhao,Lianjun Wang
To enhance the antibacterial property and chlorine resistance, organic nanospheres, polypyrrole (PPy), were innovatively incorporated into the polyamide (PA) layer for fabricating thin film nanocomposite (TFN) membranes. Owing to the improved hydrophilicity and compatibility between the PPy nanospheres and the PA layer, the obtained TFN membranes exhibited significant water flux enhancement without sacrificing salt rejection. Under the optimal PPy dosage (0.006 wt%), TFN membranes showed a high water flux of 42.19 L/(m 2 h), which was 118.0% higher than that of the pristine membrane. Remarkably, the chlorine resistance of TFN membranes was strengthened after the incorporation of PPy nanospheres, as evidenced by the less decreased salt rejection, as compared with the TFC and commercial RO membrane. In addition, the positively charged PPy nanospheres immobilized in the PA layer endow the TFN membranes with improved biocidal activity, which was much higher than that of the pristine membrane. This study shows that incorporating organic nanospheres into the PA layer is an effective strategy to develop new TFN membranes with enhanced performance for advanced water purification.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Zhaomin Wang,Lu Yu,Limin Chang,Limin Wang,Yong Cheng
Owing to its high capacity of 994 mAh g −1 , low cost, and environmental friendliness , tin (Sn) is considered as an advanced anode material for high-capacity lithium-ion batteries (LIBs). Here, a facile strategy to fabricate core-shell structured Sn@NC composites with one-step and large-scale production is introduced in a liquid-phase reaction under room temperature . When used as anode materials for LIBs, the optimal Sn@NC composite delivers a high reversible discharge capacity of 761.2 and 476 mAh g −1 at a current density of 200 and 1000 mA g −1 after 200 cycles, respectively. A high capacity of 328.3 mAh g −1 can also be obtained even at a current density of 2000 mA g −1 . The excellent cycling stability and rate performance of the composite can be ascribed to the synergistic effect of the nanometer size of Sn powder and porous structure of the carbon shell, both of which can effectively reduce the absolute volume change of electrode during the repeated charge-discharge cycles, and thus lead to excellent electrochemical performances at both rate capability and cycling life.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Meiling Wang,Mingzhu Cui,Weifeng Liu,Xuguang Liu
Conductive polymer hydrogels (CPHs) have exhibited great potential as advanced material for sensing. Here, a facile approach to 3D networked polypyrrole (PPy) hydrogel is reported. This strategy relies on the doping of the azo dye molecule Tartrazine during the synthesis of nanostructured conductive PPy hydrogel. The prepared PPy hydrogel can be highly dispersible in the mixed solvent of isopropanol/H 2 O (4/1). The unique 3D network nanostructure endow PPy hydrogels with high electric conductivity and effective interface area for enhanced sensing performance towards the simultaneous determination of ascorbic acid , dopamine and uric acid with respective lower detection limits of 1.283, 0.044 and 0.046 μmol L −1 . The as-designed electrochemical sensor also exhibited excellent stability and reproducibility.
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高影响因子
ChemPlusChem
·
2018
·Vol. 83
·期 12
·1127-1134
·
IF 3.205
Yixin Chen,Siyuan Xiang,Lu Wang,Mingyue Wang,Congcong Wang,Shuwei Liu,Kai Zhang,Bai Yang
Graphical Ready to load : Hollow polypyrrole nanospindles were fabricated with MIL-88(Fe) serving as both the template and oxidizing agent for the polymerization, and water acting as the etching agent. The resulting hollow nanostructures showed excellent photothermal and drug-loading capabilities and significant anticancer effects in vivo. Polypyrrole (PPy) hollow nanostructures continue to attract the interest researchers because of their good biocompatibility, high photothermal conversion efficiency, and excellent stability. The preparation of PPy hollow nanostructures by the hard templating method without complicated post-synthetic treatment and additional oxidizing agents remains a challenge. In this work, we report a facile and novel hard templating method to fabricate hollow PPy nanospindles in which MIL-88(Fe) serves as the template. Fe 3+ centers in MIL-88(Fe) could induce the polymerization of pyrrole to construct the shell, and MIL-88(Fe) would be decomposed by solvent water. This method did not require any extra oxidizing agents and post-synthetic treatment. Hollow PPy nanospindles exhibit excellent photothermal and drug loading ability, and the therapy effect of cancer was significant. This method provides a new hard templating approach for the synthesis of polymer hollow nanostructures.
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高影响因子
危险品化学品经营许可证（带存储）