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Jingwen Ma, Min Wang, Guangyu Lei, Guoliang Zhang, Fengbao Zhang, Wenchao Peng, Xiaobin Fan, Yang Li
The development of highly efficient and durable non-noble metal electrocatalysts for the hydrogen evolution reaction (HER) is significant for clean and renewable energy research. This work reports the synthesis of N-doped graphene nanosheets supported N-doped carbon coated cobalt phosphide (CoP) nanoparticles via a pyrolysis and a subsequent phosphating process by using polyaniline. The obtained electrocatalyst exhibits excellent electrochemical activity for HER with a small overpotential of -135 mV at 10 mA cm(-2) and a low Tafel slope of 59...
November 17, 2017: Small
Daisuke Sakamaki, Akihiro Ito, Yusuke Tsutsui, Shu Seki
Two kinds of aza[1n]paracyclophanes, tetraaza[14]paracyclophane (P4) and octaaza[18]paracyclophane (P8), were synthesized as the smallest and the largest monodisperse macrocyclic oligomers of polyaniline ever made. Herein we reports the electronic nature of the cationic species of these two macrocycles with different ring-size. By combining ESR spectroscopy and DFT calculations, it was suggested that P4·+ was classified into delocalized class III or poised on the class II/III borderline, while P8·+ was regarded as localized class II mixed-valence system...
November 15, 2017: Journal of Organic Chemistry
Pegah Hashemi, Hasan Bagheri, Abbas Afkhami, Yalda Hosseinzadeh Ardakani, Tayyebeh Madrakian
In the present research, we have developed a novel label free aptasensor based on screen printed carbon electrode (SPCE) modified with three-dimensional magnetic reduced graphene oxide(3D-MRGO)/polyaniline(PA)/gold nanoparticle(AuNP) nanocomposite for impedimetric determination of cocaine. To achieve this goal, a specific thiolated cocaine aptamer was immobilized onto the surface of synthesized nanocomposite. The signaling mechanism of the proposed aptasensor was based on increase in the [Fe(CN)6](3-/4-) charge transfer resistance (RCT) as an electrochemical probe in the presence of target analyte...
December 15, 2017: Analytica Chimica Acta
Mohamad Shariff Shahriman, Muggundha Raoov Ramachandran, Nur Nadhirah Mohamad Zain, Sharifah Mohamad, Ninie Suhana Abdul Manan, Suhaila Mohd Yaman
In this present study, magnetic nanoparticles (MNPs) nanocomposites modified with polyaniline (PANI) coated newly synthesised dicationic ionic liquid (DICAT) forming MNP-PANI-DICAT were successfully synthesised as new generation material for magnetic solid phase extraction (MSPE). MNP-PANI-DICAT was characterised by FT-IR NMR, CHN, BET, SEM, TEM, and VSM techniques and the results were compared with MNP-PANI and native MNP. This new material was applied as a magnetic adsorbent for the pre-concentration and separation of polycyclic aromatic hydrocarbons (PAHs) due to the π-π interaction between polyaniline shell and dicationic ionic liquid (DICAT) with PAHs compounds...
February 1, 2018: Talanta
Zhaodongfang Gao, Junwei Yang, Jing Huang, Chuanxi Xiong, Quanling Yang
Conducting polymer based supercapacitors usually suffer from the difficulty of achieving high specific capacitance and good long-term stability simultaneously. In this communication, a long-chain protonic acid doped solvent-free self-suspended polyaniline (S-PANI) fluid and reduced graphene oxide (RGO) were used to fabricate a three-dimensional RGO/S-PANI aerogel via a simple self-assembled hydrothermal method, which was then applied as a supercapacitor electrode. This 3D RGO/S-PANI composite exhibited a high specific capacitance of up to 480 F g(-1) at a current density of 1 A g(-1) and 334 F g(-1) even at a high discharge rate of 40 A g(-1)...
November 13, 2017: Nanoscale
Alireza Ghiasvand, Samira Koonani, Fatemeh Yazdankhah, Saeid Farhadi
A simple, rapid, and reliable headspace solid-phase microextraction (HS-SPME) procedure, reinforced by applying vacuum in the extraction vial, was developed. It was applied for the extraction of nicotine in solid samples prior to determination by gas chromatography-flame ionization detection (GC-FID). First, the surface of a narrow stainless steel wire was made porous and adhesive by platinization to obtain a durable, higher surface area, and resistant fiber. Then, a thin film of sulfonated graphene/polyaniline (Sulf-G/PANI) nanocomposite was synthesized and simultaneously coated on the platinized fiber using the electrophoretic deposition (EPD) method...
November 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
Saerona Kim, Thanh-Hai Le, Chul Soon Park, Geunsu Park, Kyung Ho Kim, Semin Kim, Oh Seok Kwon, Gyun Taek Lim, Hyeonseok Yoon
A smart and effective anticorrosive coating consisting of alternating graphene and polyaniline (PANI) layers was developed using top-down solution processing. Graphite was exfoliated using sonication assisted by polyaniline to produce a nanostructured, conductive graphene/polyaniline hybrid (GPn) in large quantities (>0.5 L of 6 wt% solution in a single laboratory-scale process). The GPn was coated on copper and exhibited excellent anticorrosion protection efficiencies of 46.6% and 68.4% under electrochemical polarization in 1 M sulfuric acid and 3...
November 9, 2017: Scientific Reports
Cristina Della Pina, Maria Antonietta De Gregorio, Laura Clerici, Pierluisa Dellavedova, Ermelinda Falletta
Polyaniline (PANI)-based materials for both removal and sampling of volatile organic compounds (VOCs) from air by rapid adsorption/desorption processes have been developed. The polymer was synthesized in form of emeraldine as both salt and base using different synthetic approaches, a traditional one and a "green" one. VOCs adsorption/desorption efficiency was evaluated for all the materials analyzing the desorbed VOCs fractions by GC/MS technique and obtaining results similar to the presently adopted method employing commercial activated carbon...
October 12, 2017: Journal of Hazardous Materials
Qi Zhang, Xiaoyan Li, Chunhua Qian, Li Dou, Feng Cui, Xiaojun Chen
The content of neuron specific enolase (NSE) in serum is considered to be an essential indicator of small cell lung cancer (SCLC). Here, a novel label-free electrochemical immunoassay for the detection of NSE based on the three dimensionally macroporous reduced graphene oxide/polyaniline (3DM rGO/PANI) film has been proposed. The 3DM rGO/PANI film was constructed by electrochemical co-deposition of GO and aniline into the interspaces of a sacrificial silica opal template modified Au slice. During the co-deposition, GO was successfully reduced by aniline and PANI could be deposited on the surfaces of rGO sheets...
November 4, 2017: Analytical Biochemistry
Choon-Sang Park, Eun Young Jung, Dong Ha Kim, Do Yeob Kim, Hyung-Kun Lee, Bhum Jae Shin, Dong Ho Lee, Heung-Sik Tae
Although polymerized aniline (polyaniline, PANI) with and without iodine (I₂) doping has already been extensively studied, little work has been done on the synthesis of PANI films using atmospheric pressure plasma (APP) deposition. Therefore, this study characterized pure and I₂-doped PANI films synthesized using an advanced APP polymerization system. The I₂ doping was conducted ex-situ and using an I₂ chamber method following the APP deposition. The pure and I₂-doped PANI films were structurally analyzed using field emission scanning electron microscope (FE-SEM), atomic force microscope (AFM), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and time of flight secondary ion mass spectrometry (ToF-SIMS) studies...
November 6, 2017: Materials
Verónica Carrasco-Sánchez, Amalraj John, Adolfo Marican, Leonardo S Santos, V Felipe Laurie
No abstract text is available yet for this article.
November 7, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Vijayalekshmi Vijayakumar, Dipak Khastgir
A series of novel ionic cross-linked chitosan (CS) based hybrid nanocomposites were prepared by using polyaniline/nano silica (PAni/SiO2) as inorganic filler and sulfuric acid as an ionic cross-linking agent. The CS-PAni/SiO2 nanocomposites show enhanced mechanical properties and improved oxidative stabilities. These nanocomposites can be effectively used as environmental friendly proton exchange membranes. Incorporation of PAni/SiO2 into CS matrix enhances water uptake and facilitates the phase separation which enables the formation of hydrophilic domains and improves the proton transport...
January 1, 2018: Carbohydrate Polymers
Amin Zhang, Weiwei Guo, Hong Ke, Xin Zhang, Huan Zhang, Chusen Huang, Dapeng Yang, Nengqin Jia, Daxiang Cui
A sandwich-configuration electrochemiluminescence (ECL) immunosensor based on Au star@BSA-Luminol nanocomposites for ultrasensitive determination of human chorionic gonadotropin (HCG) has been developed. In this work, nanostructured Polyaniline hydrogels (Pani) decorated with Pt nanoparticles (Pani/Pt) were utilized to construct the base of this immunosensor, greatly increasing the amount of loaded capture antibodies (Ab1) via linkage reagent glutaraldehyde (GA). The used conducting Pani/Pt nanocomposites possessed the unique features, such as large surface area, high electron transfer speed and favorable electrocatalytic activities of hydrogen peroxide, which offered a prominent platform for this sandwich-sensor and acted as efficient ECL signal amplifier also...
October 18, 2017: Biosensors & Bioelectronics
Sajedeh Khorshidi, Akbar Karkhaneh
Hydrogel/fiber composites have emerged as compelling scaffolds for regeneration purposes. Any bio-related modification or feature may endow more regenerative functionality to these composites. In the present study, a hydrogel/fiber scaffold possessing electrical conductivity in both phases, hydrogel and fiber, has been prepared and evaluated. Fiber component possessed electrical conductivity due to the presence of polyaniline (PANi) and hydrogel fraction thanks to the presence of graphene nanoparticles. PANi based fibers were processed via electrospinning and transformed into a three-dimensional structure through ultrasonication...
November 1, 2017: Journal of Biomedical Materials Research. Part A
Sumita Goswami, Suman Nandy, Arghya Narayan Banerjee, Asal Kiazadeh, Gowra Raghupathy Dillip, Joana V Pinto, Sang Woo Joo, Rodrigo Martins, Elvira Fortunato
Next-generation electrical nanoimprinting of a polymeric data sheet based on charge trapping phenomena is reported here. Carbon nanoparticles (CNPs) (waste carbon product) are deployed into a polymeric matrix (polyaniline) (PANI) as a charge trapping layer. The data are recorded on the CNPs-filled polyaniline device layer by "electro-typing" under a voltage pulse (VET , from ±1 to ±7 V), which is applied to the device layer through a localized charge-injection method. The core idea of this device is to make an electrical image through the charge trapping mechanism, which can be "read" further by the subsequent electrical mapping...
November 2, 2017: Advanced Materials
Lijun Ren, Gaini Zhang, Ji Lei, Yan Wang, Dengwei Hu
It is a challenge to fabricate polyaniline (PANI) materials with high rate performance and excellent stability. Herein a new special supercapacitor electrode material of polyaniline-poly(hydroquinone)/graphene (PANI-PHQ/RGO) film with layered structure was prepared by chemical oxidative polymerization of aniline and hydroquinone (H2Q) in the presence of RGO hydrogel film. The synergistic effect and loose layered structure of the composite film facilitate fast diffusion and transportation of electrolyte ions through unimpeded channels during rapid charge-discharge process, resulting in high rate capability and stable cycling performance...
October 18, 2017: Journal of Colloid and Interface Science
Mohamed Shaban, Mohamed Rabia, Asmaa M Abd El-Sayed, Aya Ahmed, Somaya Sayed
In this work, roll-graphene oxide (Ro-GO), polyaniline (PANI) nano/microparticles, and PbS nanoparticles were prepared by modified Hammer, oxidative polymerization, and chemical bath deposition methods, respectively. These nano/microstructures were characterized, optimized, and designed to form PbS/Ro-GO/PANI nano/microcomposite. Also, the ratios of PbS and Ro-GO were optimized, and the optimized composition of the used composite was 0.4 g PANI, 0.125 g Ro-GO, and 0.075 g PbS. The band gap values for PANI, PbS, Ro-GO, and PbS/Ro-GO/PANI rocomposite were 3, 1...
October 26, 2017: Scientific Reports
Jianyun Liu, Xiuting Li, Christopher Batchelor-McAuley, Richard G Compton
As reported previously (Applied Materials Today 2017, 7, 239-245), the charge transfer to partially oxidized PANI nanotubes in electrochemical reactions is heavily limited due to the non-conductivity of the reduction/oxidation products. In this paper, the doping level of individual polyaniline (PANI) nanotubes was substantially enhanced using nitrite as an electron acceptor in sulphuric acid aqueous solution as recorded by the nano-impact method. The charge transferred to one single tube during reduction process is close to the theoretical value of 170±112 pC per tube (assuming 2-electron reduction for the PANI tubes studied), while the charge during PANI oxidation is dramatically decreased...
October 25, 2017: Chemistry: a European Journal
Yaozu Liao, Zhonghua Cheng, Weiwei Zuo, Arne Thomas, Charl F J Faul
Nitrogen-rich conjugated microporous polymers (NCMPs) have attracted great attention in recent years owing to their polarity, basicity, and ability to coordinate metal ions. Herein, three NCMPs, structurally close to polyaniline, were facilely synthesized via chemical oxidative polymerization between multiconnected aniline precursors. The NCMPs with high N content (11.84 wt %), intrinsic ultramicroporosity (<1 nm), and moderate surface area (485 m(2) g(-1)) show wide-ranging adsorption functionality, e.g...
November 8, 2017: ACS Applied Materials & Interfaces
Wei Zhao, Cheng Li, Aijian Wang, Cuncai Lv, Weihua Zhu, Shengping Dou, Qian Wang, Qin Zhong
Polyaniline (PANI)-decorated Bi2MoO6 nanosheets (BMO/PANI) were prepared by a facile solvothermal method. Different characterization techniques, including X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, diffuse reflectance ultraviolet-visible spectroscopy, photoluminescence spectroscopy, electrochemical impedance spectroscopy, photocurrent spectroscopy, and nanosecond time-resolved emission studies, have been employed to investigate the structure, optical and electrical properties of the BMO/PANI composites...
November 1, 2017: Physical Chemistry Chemical Physics: PCCP
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