Journal of Saudi Chemical Society
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2016
·
IF 1.978
Bingzhen Li,Xiaodi Weng,Guojing Wu,Yang Zhang,Xuliang Lv,Guangxin Gu
Fe 3 O 4 /PPy/PANI (Fe 3 O 4 /polypyrrole/polyaniline) nanocomposites with excellent microwave absorbing properties have been successfully synthesized and characterized systematically. In detail, Fe 3 O 4 nanoparticles were prepared via an environmental friendly, modified co-precipitation method. Afterward, two conductive polymers, PPy and PANI, were deposited onto the surface of Fe 3 O 4 nanoparticles by in-situ polymerization of pyrrole and aniline. PPy and PANI was “glued” by the strong affinity between the carbonyl groups of PPy and the conjugated chains of PANI. The obtained Fe 3 O 4 /PPy/PANI nanocomposites have been found to possess excellent microwave absorbing property with the absorption bandwidth of 10.7 GHz (6.7–17.4 GHz) and maximum reflection loss at 10.1 GHz (−40.2 dB). It proves that the combination of ultra-small Fe 3 O 4 nanoparticles with two different conductive polymers have a great potential in the application of microwave absorbing materials.
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ACS Applied Materials & Interfaces
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2016
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IF 7.145
Yu-Da Zhu,Su-Ping Chen,Huan Zhao,You Yang,Xiao-Qin Chen,Jing Sun,Hong-Song Fan,Xing-Dong Zhang
A medical nanoplatform with small size, low cost, biocompatibility, good biodegradability, and, in particular, multifunctionality has attracted much attention in the exploration of novel therapeutic methodologies. As an emerging material of self-assembled porous structure, metal–organic frameworks (MOFs) have high expectations because of their special properties compared to traditional porous materials. Therefore, integration of MOFs and functional materials is leading to the creation of new multifunctional composites/hybrids. Photothermal therapy (PTT), using near-IR (NIR) laser-absorbing nanomaterials as PTT agents, has shown encouraging therapeutic effects to photothermally ablate tumors. However, the most of widely used PTT agents are inorganic materials and nonbiodegradable. Herein, uniform polypyrrole (PPy) nanoparticles (NPs) with good biodegradability were synthesized by a microemulsion method. The PPy NPs were further coated with the mesoporous iron-based MOF structure MIL-100 by interaction between PPy NPs and MIL-100 precursors at room temperature. As a multifunctional nanoplatform, an anticancer drug could easily be loaded into the mesopores of the MIL-100 shell. The PPy core, as an organic photothermal agent, is able to photothermally ablate cancer cells and improve the efficacy of chemotherapy under NIR irradiation. The composites showed an outstanding in vivo synergistic anticancer capacity. Our work could encourage further study in the construction of a synergetic system using MOFs and organic PTT agents.
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RSC Advances
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2016
·Vol. 6
·期 72
·67764-67770
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IF 3.289
Liuxue Shen,Peng Sun,Chuanxi Zhao,Shaozao Tan,Wenjie Mai
Recently, flexible supercapacitors as promising energy storage devices for wearable electronics have drawn great attention. Here, all-solid-state tailorable supercapacitors (TSCs) based on flexible carbon nanotube (CNT)–polymer and CNT–metal oxide composite hybrid electrodes are successfully demonstrated. The CNT–polypyrrole (PPy) based TSC devices display an excellent electrochemical performance with a volumetric capacitive of 4.4 F cm−3 at the current density of 0.04 A cm−3 (energy density of 0.39 mW h cm−3 at a power density of 9.05 mW cm−3). Strikingly, the TSCs can maintain most of the electrochemical performance and still be operational for powering small electronics like a light-emitting diode (LED) even after undergoing a random cut. When the TSCs are cut down by half of their size, the capacitance retention was ∼50%, suggesting that the tailoring process can hardly affect their performance. Moreover, the other kind of TSC devices can be fabricated by using CNT–MnO2 hybrid flexible electrodes as another example, which demonstrates the broadened potential of our design.
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JOURNAL OF CHROMATOGRAPHY A
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2016
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IF 3.926
Feifei Qi,Liangliang Qian,Jingjing Liu,Xiaoqing Li,Lingeng Lu,Qian Xu
This study used nanofibers mat (NFsM)-based micro-SPE (μ-SPE) in 96-well plate format as a novel high-throughput sample preparation technique prior to the determination of cationic dyes in wastewater using HPLC-DAD. P-Toluene sulfonate (PTS − ) doped polypyrrole (PPy) functionalized NFsM (PTS-PPy NFsM) was optimized as SPE sorbent in aspects of PPy form (particles and NFsM) and its doped anions (Cl − and PTS − ), which showed good extraction efficiency and adsorption capacity for cationic dyes (Auramine-O, Chrysoidine and Rhodamine-B). Under the optimal conditions, the limits of detection (LODs) were between 0.3 and 0.5 μg/L, and the linearity was achieved in the concentration ranging from 1.0 to 150.0 μg/L with correlation coefficients (R) between 0.992 and 0.999. Compared with the published SPE methods, this approach demonstrated its advantages such as shorter extraction time (0.3 min per sample), lower requirement sorbent (2.0 mg), lower volume of organic solvent (0.7 mL), higher recovery (90.1–99.1%) and precision (RSDs < 6.9%). With this developed method, we have successfully analyzed the dyeing industry wastewater, which meets the Discharge Standards of Water Pollutants for Dyeing and Finishing of Textile Industry in China. The concentrations of three analyzed cationic dyes were from 2.9 to 13.9 μg/L. The NFsM-based μ-SPE technique is practically a high-throughput sample preparation procedure that can accurately assess the pollutants in the wastewater from dyeing industry.
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ORGANIC ELECTRONICS
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2016
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IF 3.471
Haihan Zhou,Hua-Jin Zhai
Flexible electrodes of ternary composites, in which highly conductive carbon nanotube films (CNFs) are coated with carbon nanotube-doped graphene oxide/polypyrrole (CNT-GO/PPy), have been fabricated via facile electrochemical synthesis . Long and short CNTs are separately doped into the composites (lCNT-GO/PPy and sCNT-GO/PPy) and their electrochemical performances are compared. Electrochemical measurements indicate that the doping of CNTs in the composites significantly improves the electrochemical behaviors of the GO/PPy electrodes. Notably, the lCNT-GO/PPy electrodes show superior electrochemical properties with respect to the sCNT-GO/PPy electrodes, which is related to the introduction of abundant CNTs in the former electrodes and their special microstructures. Two symmetric electrodes with the lCNT-GO/PPy composites coated on CNFs are assembled to fabricate a solid-state supercapacitor device, which features lightweight, ultrathinness, and high flexibility. The device achieves a high areal and volumetric specific capacitance of 70.0 mF cm −2 at 10 mV s −1 and 6.3 F cm −3 at 0.043 A cm −3 , respectively. It also shows superior rate performance and cycle stability, with a capacitance retention rate of 87.7% for 10,000 cycles. The supercapacitor device fabricated is promising for the use in lightweight and flexible integrated electronics.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2016
·Vol. 408
·期 21
·5779-5787
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IF 3.125
Wang Yuedan,Zhou Zhou,Qing Xing,Zhong Weibing,Liu Qiongzhen,Wang Wenwen,Li Mufang,Liu Ke,Wang Dong
Fiber organic electrochemical transistors (FECTs) based on polypyrrole and nanofibers have been prepared for the first time. FECTs exhibited excellent electrical performances, on/off ratios up to 10 4 and low applied voltages below 2 V. The ion sensitivity behavior of the fiber organic electrochemical transistors was investigated. It exhibited that the transfer curve of FECTs shifted to lower gate voltage with increasing cations concentration, the sensitivity reached to 446 μA/dec in the 10 –5 –10 –2 M Pb 2+ concentration range. The ion selective properties of the FECTs have also been systematically studied for the detection of potassium, calcium, aluminum, and lead ions. The devices with different cations showed great difference in response curves. It was suitable for selectively monitoring Pb 2+ with respect to other cations. The results indicated FECTs were very effective for electrochemical sensing of lead ion, which opened a promising perspective for wearable electronics in healthcare and biological application.
The schematic diagram of fiber organic electrochemical transistors based on polypyrrole and nanofibers for ion sensing.
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RSC Advances
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2016
·Vol. 6
·期 64
·59292-59298
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IF 3.289
Jianqiao Zhang,Huan Chen,Zi Chen,Jiaojie He,Wenxin Shi,Dongmei Liu,Huizhong Chi,Fuyi Cui,Wei Wang
A high-performance, cost-effective and spongeous adsorbent was rationally designed for Cr(VI) removal from aqueous solution based on PPy modified natural quasi two-dimensional (2D) structures. Core of corncobs, a kind of agricultural waste composed of quasi 2D sub-micro sheets, has a unique macroporous spongeous microstructure. In consideration of the unique chemical structure of polypyrrole (PPy) and microstructure of the natural sponge, we constructed the microstructured spongeous adsorbents. The PPy active layer provided reactive sizes to detoxifies Cr(VI) ions by ion-exchange. While the spongeous microstructure provided by the microsheets could enhance the adsorption performance by increasing active areas and facilitating the access of pollutants inside the adsorbents. Compared with artificial nano-powder adsorbents, CC–PPy displayed larger advantage in separation process and fabrication/operation cost. Compared with other bulk-style PPy composites, the adsorption capacity of CC–PPy was several times higher. In addition, the regeneration and stability of CC–PPy was outstanding with no loss in the adsorption to Cr(VI) even after 3 adsorption–desorption cycles. The present development provides a solution to design highly efficient and cost-effective water treatment agents.
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Journal of Materials Chemistry A
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2017
·Vol. 5
·期 44
·23170-23178
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IF 8.867
Long Jiao,Yingli Hu,Huanxin Ju,Chunde Wang,Min-Rui Gao,Qing Yang,Junfa Zhu,Shu-Hong Yu,Hai-Long Jiang
By selecting 4,4′-dicyanobiphenyl (DCBP) as a building block, porous covalent triazine-based frameworks (CTFs) incorporating pyridinic N only have been deliberately fabricated. Upon pyrolysis, the CTF-templated N-doped and hierarchically porous carbons (NHCs) exhibit high surface area, adjustable pore structure and well-controlled doping of pyridinic and graphitic N species. The above CTFs have been rationally grown onto highly conductive reduced graphene oxide (rGO) to afford CTF/rGO hybrids. The subsequent pyrolysis gives sandwich-like NHC/rGO composites, which synergistically integrate respective advantages of both the components of NHC and rGO, thus offering excellent electrocatalytic performance for the oxygen reduction reaction (ORR). Significantly, the resultant NHC/rGO-950 exhibits a more positive onset and half-wave potential, higher diffusion-limited current density and better long-term stability than the state-of-the-art Pt/C and is among the best of previously reported metal-free electrocatalysts, in alkaline solution. Such rGO-templated NHCs based on CTFs offer a promising strategy to design highly efficient metal-free ORR electrocatalysts for fuel cells.
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Journal of Materials Chemistry B
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2017
·Vol. 5
·期 27
·5499-5505
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IF 4.543
Yanzhou Jiang,Na Song,Ce Wang,Nicola Pinna,Xiaofeng Lu
In recent years, the fabrication of functional nanostructures with multicomponents for a variety of novel biosensors has received considerable attention due to their synergistic improved sensitivity. Herein, we report a facile approach for the preparation of Fe3O4/nitrogen-doped carbon (Fe3O4/N–C) hybrid nanofibers, and construct a sensing platform for the sensitive colorimetric detection of H2O2 and ascorbic acid (AA). During the synthetic process, a discontinuous layer of polypyrrole (PPy) is first polymerized in situ on the surface of the α-Fe2O3 nanofibers under hydrothermal reaction using α-Fe2O3 nanofibers as both a template and an oxidant. Then the prepared α-Fe2O3/PPy nanofibers are converted into Fe3O4/N–C hybrid nanofibers through pyrolysis with a thermochemical reduction process. The resulting Fe3O4/N–C hybrid nanofibers are used as a novel peroxidase mimic towards the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H2O2, with a superior catalytic activity over individual α-Fe2O3 nanofibers, α-Fe2O3/PPy nanofibers, Fe3O4/C nanofibers, and commercial Fe3O4 nanoparticles. Based on the high peroxidase-like activity of Fe3O4/N–C hybrid nanofibers, a sensing platform for the colorimetric detection of AA is developed. A good linear relationship from 0 to 50 μM and a detection limit of 0.04 μM are achieved. This work offers a new method for the preparation of Fe3O4/N–C hybrid nanofibers and presents new potential applications in biosensing, medical diagnostics and environmental monitoring.
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ACS Applied Materials & Interfaces
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2016
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IF 7.145
Lina Zhang,Hui Zhang,Mei Liu,Bin Dong
In this paper, we report a polymer-based raspberry-like micromotor. Interestingly, the resulting micromotor exhibits multistimuli-responsive motion behavior. Its on–off–on motion can be regulated by the application of stimuli such as H2O2, near-infrared light, NH3, or their combinations. Because of the versatility in motion control, the current micromotor has great potential in the application field of logic gate and logic circuit. With use of different stimuli as the inputs and the micromotor motion as the output, reprogrammable OR and INHIBIT logic gates or logic circuit consisting of OR, NOT, and AND logic gates can be achieved.
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Journal of Materials Chemistry A
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2016
·Vol. 4
·期 24
·9502-9510
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IF 8.262
Chao Zhang,Jian Xiao,Lihua Qian,Songliu Yuan,Shuai Wang,Pengxiang Lei
Flexible, wearable, implantable and easily reconfigurable micro-fabricated pseudocapacitors with impressive volumetric stack capacitance and energy densities are desired for electronic devices. In this work, scratching technology at the micron-scale enables construction of the planar electrode systems directly based on nanoporous gold films. We demonstrate that both nanoporous channels with high ion-accessible ability and interconnected skeletons with high conductivity enable the design of pseudocapacitive micro-supercapacitors with high performances. These planar devices show several attractive features including ultrafast charge/discharge (high rate), large capacitance (1.27 mF cm−2, 127 F cm−3), and ultrahigh energy density (0.045 W h cm−3) while maintaining a high power density (22.21 W cm−3). Especially, the superb cyclability and mechanical flexibility give them great potential for future microelectronics with a tiny volume. The design concept reported here provides an avenue to integrate planar micro-supercapacitors into large-scale devices with a small environmental footprint.
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SYNTHETIC METALS
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2016
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IF 2.299
Shu Ying,Weiqian Zheng,Bingrui Li,Xiao She,Huabo Huang,Liang Li,Zhiliang Huang,Yineng Huang,Zhitian Liu,Xianghua Yu
Elastic conducting polypyrrole nanotube aerogels are fabricated through static assembly in the aqueous phase and freeze-drying method. The microstructures and properties were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman, strain-stress and electrical conductivity measurements. The elastic aerogel can be compressed by 60% and recover to its original shape within seconds. Moreover, it can remain their structural integrity under hundreds of compression/release cycles. The unique microstructures endow the elastic aerogel with an extremely fast recovery, accompanied with quick change of conductivity. All of the features of the resulting polypyrrole nanotube aerogels render them attractive for potential stress sensing and energy conversion/storage applications.
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