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B Öztaş, D Akyüz, A Koca
Peripherally and non-peripherally terminal alkynyl substituted manganese phthalocyanines (MnPc) were synthesized and characterized and then used as functional materials in modified electrodes. MnPcs were substituted with alkynyl groups, which are reactive moieties in click electrochemistry (CEC) reactions. Mn(iii) cations were incorporated into the cavity of the Pc ring in order to increase the redox activity of the complexes. Electrochemical characterizations of the complexes were determined by voltammetric and in situ spectroelectrochemical measurements in order to determine their possible technological applications...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
David Ibañez, Elisa Vallés, Elvira Gómez, Alvaro Colina, Aranzazu Heras
Janus structures represent an overwhelming member of materials with adaptable chemical and physical properties. The development of new synthesis routes has allowed the fabrication of Janus architectures with specific characteristics depending on the final applications. In the case of the membranes, the improvement of wet routes has been limited to the capillary effect, in which the solution can gradually penetrate through the membrane avoiding a double modification, different at each face of the membrane. In this work, we propose a new electrochemical methodology to circumvent the capillary limitation and to obtain a double electrochemical functionalization in only one step in a controlled way...
September 19, 2017: ACS Applied Materials & Interfaces
Ke Lu, Ziyu Hu, Jizhen Ma, Houyi Ma, Liming Dai, Jintao Zhang
Graphitic carbons have been used as conductive supports for developing rechargeable batteries. However, the classic ion intercalation in graphitic carbon has yet to be coupled with extrinsic redox reactions to develop rechargeable batteries. Herein, we demonstrate the preparation of a free-standing, flexible nitrogen and phosphorus co-doped hierarchically porous graphitic carbon for iodine loading by pyrolysis of polyaniline coated cellulose wiper. We find that heteroatoms could provide additional defect sites for encapsulating iodine while the porous carbon skeleton facilitates redox reactions of iodine and ion intercalation...
September 13, 2017: Nature Communications
Qingxiang Zhou, Yuqin Wang, Junping Xiao, Huili Fan
In this study, we fabricated a novel material composed of magnetic graphene oxide incorporated Fe3O4@polyaniline (Fe3O4@PANI-GO) using a modified Hummers' method, solvothermal, and two-step polymerisation method. The resulting products were characterised by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD). The results indicated that magnetic Fe3O4@PANI particles were successfully loaded onto the surface of the graphene oxide. Further Fe3O4@PANI-GO was investigated to remove bisphenol A(BPA), α-naphthol, and t-octyl-phenol (t-OP) from water samples by magnetic solid phase extraction...
September 12, 2017: Scientific Reports
David Gosselin, Maxime Gougis, Mélissa Baque, Fabrice P Navarro, Mohamed Naceur Belgacem, Didier Chaussy, Anne-Gaelle Bourdat, Pascal Mailley, Jean Berthier
Nucleic acid amplification testing is a very powerful method to perform efficient and early diagnostics. However, the integration of a DNA amplification reaction with its associ-ated detection in a low-cost, portable and autonomous device remains challenging. Addressing this challenge, the use of screen-printed electrochemical sensor is reported. To achieve the detection of the DNA amplification reaction, a real-time monitoring of the hydronium ions concentration, a by-product of this reaction, is performed...
September 12, 2017: Analytical Chemistry
Hong Yan, Mengjuan Zhong, Ze Lv, Pengbo Wan
A stretchable, transparent, and body-attachable chemical sensor is assembled from the stretchable nanocomposite network film for ultrasensitive chemical vapor sensing. The stretchable nanocomposite network film is fabricated by in situ preparation of polyaniline/MoS2 (PANI/MoS2 ) nanocomposite in MoS2 suspension and simultaneously nanocomposite deposition onto prestrain elastomeric polydimethylsiloxane substrate. The assembled stretchable electronic sensor demonstrates ultrasensitive sensing performance as low as 50 ppb, robust sensing stability, and reliable stretchability for high-performance chemical vapor sensing...
September 12, 2017: Small
Yanlong Lv, Liu Yang, Dapeng Cao
The severe dependence of oxygen reduction reaction (ORR) in fuel cells on platinum (Pt)-based catalysts greatly limits the process of their commercialization. Therefore, developing cost-reasonable non-precious-metal catalysts to replace Pt-based catalysts for ORR is an urgent task. Here, we use the composite of inexpensive polyaniline and superfine polytetrafluoroethylene powder as precursor to synthesize a metal-free N,F-codoped porous carbon catalyst (N,F-Carbon). Results indicate that the N,F-Carbon catalyst obtained at the optimized temperature 1000 °C exhibits almost the same onset (0...
September 18, 2017: ACS Applied Materials & Interfaces
Ying Zhong, Zhisheng Chai, Zhimin Liang, Peng Sun, Weiguang Xie, Chuanxi Zhao, Wenjie Mai
Due to the popularity of the smart electronics, multi-functional energy storage devices, especially the electrochromic supercapacitors (SCs), have attracted tremendous research interests. Herein, a solid-state electrochromic asymmetric SC (ASC) window is designed and fabricated by introducing WO3 and polyaniline (PANI) as the negative and positive electrodes, respectively. The two complementary materials contribute to the outstanding electrochemical and electrochromic performances of the fabricated device. With an operating voltage window of 1...
September 8, 2017: ACS Applied Materials & Interfaces
Muzammil Anjum, Hasan A Al-Talhi, Saleh A Mohamed, Rajeev Kumar, M A Barakat
Biogas production using waste activated sludge (WAS) is one of the most demanding technologies for sludge treatment and generating energy in sustainable manner. The present study deals with the photocatalytic pretreatment of WAS using ZnO-ZnS@polyaniline (ZnO-ZnS@PANI) nanocomposite as means for increasing its degradability for improved biogas production by anaerobic digestion (AD). Photocatalysis accelerated the hydrolysis of WAS and increased the sCOD by 6.7 folds after 6 h and transform tCOD into bioavailable sCOD...
September 2, 2017: Journal of Environmental Management
Virgil Andrei, Kevin Bethke, Fani Madzharova, Aafke Cecile Bronneberg, Janina Kneipp, Klaus Rademann
Although the deposition of alternating layers from poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) and polyaniline (PANI) salts has recently provided a breakthrough in the field of conductive polymers, the cause for the conductivity enhancement has remained unclear. In this work, we report a cooperative doping effect between alternating PANI base and PEDOT:PSS layers, resulting in electrical conductivities of 50-100 S cm(-1) and power factors of up to 3.0±0.5 μW m(-1) K(-2), which surpass some of the recent values obtained for protonated PANI/PEDOT:PSS multi-layers by a factor of 20...
September 5, 2017: ACS Applied Materials & Interfaces
Jéssica E S Fonsaca, Sergio H Domingues, Elisa S Orth, Aldo J G Zarbin
The greatest challenge regarding black phosphorus (BP) comes as a result of its fast degradation when exposed to ambient conditions, which has overshadowed its applications. Herein, we report a simple and efficient route towards overcoming BP deterioration by preparing a nanocomposite with the conducting polymer polyaniline (PANI). The liquid/liquid interfacial method was employed to produce transparent, freestanding and transferable thin film of BP covered by PANI, with high stability under ambient atmosphere, up to 60 days...
August 31, 2017: Scientific Reports
Hang Zhao, Lei Hou, Siyi Bi, Yinxiang Lu
Despite tremendous efforts, fabrication of lightweight conductive fabrics for high-performance X-band electromagnetic interference (EMI) shielding remains a daunting technical challenge. We herein report an ingenious and efficient strategy to deposit polyaniline/cobalt-nickel (PANI/Co-Ni) coatings onto lyocell fabrics that involved consecutive steps of in situ polymerization and electroless plating. The PANI-Co-Ni trinary-component system successfully induced a synergistic effect from EM wave-absorption and EM wave-reflection, and moreover upgraded the match level between magnetic loss and dielectric loss...
August 31, 2017: ACS Applied Materials & Interfaces
Kyoungwook Kim, Hyungmin Ahn, Moon Jeong Park
We report a new approach to the synthesis of uniform, high areal density Pt nanocrystals supported by conducting polymers. The key strategy is the use of ice-templated, two-dimensional polyaniline nanosheets at the air-water interface as a platform for expediting Pt nucleation. Highly crystalline Pt nanoparticles with a narrow size distribution of 2.7 ± 0.3 nm and a high electrochemically active surface area of 94.57 m(2) g(-1) were obtained. Pt NPs were strongly anchored to the polyaniline nanosheets, and demonstrated high current densities, good durability for the methanol oxidation reaction, and excellent carbon monoxide tolerance, all of which are unprecedented...
September 13, 2017: ACS Applied Materials & Interfaces
Kamya Parashar, Niladri Ballav, Sushanta Debnath, Kriveshini Pillay, Arjun Maity
A new hybrid material comprising hydrous zirconium oxide (HZrO2) supported onto polyaniline (PANI) nanofibres (HZrO2@PANI NFs) was prepared via the precipitation of HZrO2 onto as-synthesized PANI NFs and tested for its defluoridation capabilities. The developed adsorbent (HZrO2@PANI NFs) was fully characterized by FTIR, BET, XRD, SEM-EDX, TEM-(S)TEM, XPS, and zeta potential measurements. HZrO2@PANI NFs achieved 2-fold BET surface area ∼86.64 m(2)/gas compared to PANI NFs ∼44.72 m(2)/g, implying that the incorporation of HZrO2 onto the PANI nanofibres enhanced the available surface area for effective fluoride adsorption...
August 16, 2017: Journal of Colloid and Interface Science
Jidong Wang, Xiaoyu Wang, Hengshan Tang, Zehua Gao, Shengquan He, Jian Li, Shumin Han
In this work, a novel ultrasensitive electrochemical biosensor was developed for the detection of K562 cell by a signal amplification strategy based on multiple layer CdS QDs functionalized polystyrene microspheres(PS) as bioprobe and graphene oxide(GO) -polyaniline(PANI) composite as modified materials of capture electrode. Due to electrostatic force of different charge, CdS QDs were decorated on the surface of PS by PDDA (poly(diallyldimethyl-ammonium chloride)) through a layer-by-layer(LBL) assemble technology, in which the structure of multiple layer CdS QDs increased the detection signal intensity...
August 15, 2017: Biosensors & Bioelectronics
Yiwei Zhou, Yong Hu, Wenjie Sun, Benqing Zhou, Jianzhi Zhu, Chen Peng, Mingwu Shen, Xiangyang Shi
We report the facile synthesis of polyaniline (PANI)-loaded γ-polyglutamic acid (γ-PGA) nanogels (NGs) for photoacoustic (PA) imaging-guided photothermal therapy (PTT) of tumors. In this work, γ-PGA NGs were first formed via a double emulsion approach, followed by crosslinking with cystamine dihydrochloride (Cys) via 1-ethyl-3-[3-dimethylaminopropyl]carbodiimide hydrochloride coupling chemistry. The formed γ-PGA/Cys NGs were employed as a nanoreactor to load aniline monomers via an electrostatic interaction for subsequent in situ polymerization in the presence of ammonium persulfate...
August 31, 2017: Nanoscale
Jin Young Kim, Yong Joon Park
We herein report the preparation of carbon nanotube (CNT)/Co3O4 nanocomposites selectively coated with polyaniline (PANI) via an electropolymerization method, for use as an effective electrode material for Li-air (Li-O2) batteries. The Co3O4 catalyst attached to the CNTs facilitated the dissociation of reaction products and reduced the overpotential of the cells. As the carbon surface activates the side reactions, the PANI coating on the carbon surface of the electrode suppressed the side reaction at the electrode/Li2O2 and electrode/electrolyte interfaces, thus enhancing the cycle performance of the electrode...
August 17, 2017: Scientific Reports
A A Pud, O A Nikolayeva, L O Vretik, Yu V Noskov, N A Ogurtsov, O S Kruglyak, E A Fedorenko
This work is concentrated on synthesis and investigation of new core-shell nanocomposites of polystyrene (PS) with doped polyaniline (PANI). The latex containing PS nanoparticles with sizes of 15-30 nm was prepared by microemulsion polymerization of styrene in water media. The PS/PANI nanocomposites were synthesized by chemical oxidative polymerization of aniline in the PS latex media in a presence of lauryl sulfuric acid (LSA), which served as both dopant and plasticizer. The real content of PANI in the synthesized nanocomposites was determined by UV-Vis spectroscopy method...
August 15, 2017: Nanoscale Research Letters
Peijun Tang, Xueqin Jiang, Yangyang Wang, Huanjun Chen, Yu Shrike Zhang, Panpan Gao, Hao Wang, Xuemeng Li, Jianhua Zhou
Three-dimensional (3D) molecular imaging enables the study of biological processes in both living and nonviable systems at the molecular level and has a high potential on early diagnosis. In conjunction with specific molecular probes, optical coherent tomography (OCT) is a promising imaging modality to provide 3D molecular features at the tissue level. In this study, we introduced (gold triangular nanoprism core)/(polyaniline shell) nanoparticles (GTNPs@PANI) as an OCT contrast agent and pH-responsive nanoprobe for 3D imaging of pH distribution...
August 25, 2017: Analytical Chemistry
Weifeng Li, Xing Dai, Joseph Morrone, Gang Zhang, Ruhong Zhou
Searching for two-dimensional (2D) layered materials with diverse electronic conductivities is one of the leading topics in materials science. Herein, from first-principles calculations, we report the thickness-dependent conductivity of layered 2D polyaniline (PANI) structures. When PANI is thinned down to a monolayer, it behaves as a p-type semiconductor with an indirect bandgap of 1.04 eV from the HSE functional, which is the closest to that of bulk silicon among all the known monolayer 2D materials. When two PANI monolayers are stacked together to form a bilayer, the bandgap is reduced to only 0...
August 24, 2017: Nanoscale
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