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https://www.readbyqxmd.com/read/29165932/carbon-necklace-incorporated-electroactive-reservoir-constructing-flexible-papers-for-advanced-lithium-ion-batteries
#1
Min Du, Kun Rui, Yuanqin Chang, Yu Zhang, Zhongyuan Ma, Wenping Sun, Qingyu Yan, Jixin Zhu, Wei Huang
Metal-organic frameworks (MOFs) and their derivatives with well-defined structures and compositions show great potential for wide applications such as sensors, catalysis, energy storage, and conversion, etc. However, poor electric conductivity and large volume expansion are main obstacles for their utilization in energy storage, e.g., lithium-ion batteries and supercapacitors. Herein, a facile strategy is proposed for embedding the MOFs, e.g., ZIF-67 and MIL-88 into polyacrylonitrile fibers, which is further used as a template to build a 3D interconnected conductive carbon necklace paper...
November 22, 2017: Small
https://www.readbyqxmd.com/read/29164868/large-scale-lithography-free-production-of-transparent-nanostructured-surface-for-dual-functional-electrochemical-and-sers-sensing
#2
Kuldeep Sanger, Onur Durucan, Kaiyu Wu, Anil Haraksingh Thilsted, Arto R Heiskanen, Tomas Rindzevicius, Michael Stenbæk Schmidt, Kinga Zór, Anja Boisen
In this work, we present a dual-functional sensor that can perform surface-enhanced Raman spectroscopy (SERS) based identification and electrochemical (EC) quantification of analytes in liquid samples. A lithography-free reactive ion etching process was utilized to obtain nanostructures of high aspect ratios distributed homogeneously on a 4-inch fused silica wafer. The sensor was made up of three-electrode array, obtained by subsequent e-beam evaporation of Au on nanostructures in selected areas through a shadow mask...
November 22, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29156408/label-free-electrochemical-dna-biosensor-for-guanine-and-adenine-by-ds-dna-poly-l-cysteine-fe3o4-nanoparticles-graphene-oxide-nanocomposite-modified-electrode
#3
Majid Arvand, Mona Sanayeei, Shiva Hemmati
In this study, we aim to design a simple and effective electrochemical DNA biosensor based on a carbon paste electrode modified with ds-DNA/poly(L-cysteine)/Fe3O4 nanoparticles-graphene oxide (ds-DNA/p(L-Cys)/Fe3O4 NPs-GO/CPE) for sensitive detection of adenine (A) and guanine (G). The electrocatalytic oxidation of A and G on the electrode was explored by differential pulse voltammetry (DPV) and cyclic voltammetry (CV). This sensor shows separated and well-defined peaks for A and G, by which one can determine these biological bases individually or simultaneously...
November 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29156404/cascaded-signal-amplification-via-target-triggered-formation-of-aptazyme-for-sensitive-electrochemical-detection-of-atp
#4
Xia Li, Jianmei Yang, Jiaqing Xie, Bingying Jiang, Ruo Yuan, Yun Xiang
The construction of reliable sensors for adenosine triphosphate (ATP) detection gains increasing interest because of its important roles in various enzymatic activities and biological processes. Based on a cascaded, significant signal amplification approach by the integration of the aptazymes and catalytic hairpin assembly (CHA), we have developed a sensitive electrochemical sensor for the detection of ATP. The target ATP leads to the conformational change of the aptazyme sequences and their association with the hairpin substrates to form active aptazymes, in which the hairpin substrates are cyclically cleaved by the metal ion cofactors in buffer to release the enzymatic sequences that can also bind the hairpin substrates to generate active DNAzymes...
November 17, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29155546/a-novel-electrochemical-biosensor-based-on-a-double-signal-technique-for-d-cag-n-trinucleotide-repeats
#5
Jiao Li, Yalan Liu, Xiaoqian Zhu, Gang Chang, Hanping He, Xiuhua Zhang, Shengfu Wang
Electrochemical sensors now play an important role in analysis and detection of nucleic acids. In this work, we present a novel double-signal technique for electrochemically measuring the sequence and length of the d(CAG)n repeat. The double-signal technique used an electrochemical molecular beacon (a hairpin DNA labeled with ferrocene), which was directly modified on the surface of a gold electrode. While a reporter probe (a DNA sequence labeled with horseradish peroxidase) was hybridized to the target DNA...
November 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29153951/high-performance-hybrid-electrode-decorated-by-well-aligned-nanograss-arrays-for-glucose-sensing
#6
Rui Li, Xiongjun Liu, Hui Wang, Yuan Wu, Zhaoping Lu
The worldwide boost in glucose related diseases such as diabetics over the last decade leads to an overwhelming demand for development of advanced electrochemical glucose sensors with high sensitivity, fast response and excellent selectivity. Herein we report a novel freestanding microelectrode comprising well-aligned Cu(OH)2 nanograss arrays and uniform nanoporous copper (NPC) substrate. Such a cost-effective hierarchical hybrid structure entails a unique combination of good conductivity of NPC and high electrocatalytic activity of Cu(OH)2...
November 16, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29149687/pyrrolidinyl-pna-polypyrrole-silver-nanofoam-electrode-as-a-novel-label-free-electrochemical-mirna-21-biosensor
#7
Tawatchai Kangkamano, Apon Numnuam, Warakorn Limbut, Proespichaya Kanatharana, Tirayut Vilaivan, Panote Thavarungkul
A label-free electrochemical miRNA biosensor was developed based on a pyrrolidinyl peptide nucleic acid (acpcPNA)/polypyrrole (PPy)/silver nanofoam (AgNF) modified electrode. The AgNF was electrodeposited as redox indicator on a gold electrode, which was then functionalized with an electropolymerized layer of PPy, a conducting polymer, to immobilize the PNA probes. The fabrication process was investigated by electrochemical impedance spectroscopy. The biosensor was used to detect miRNA-21, a biomarker abnormally expressed in most cancers...
November 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29149624/a-pvc-polypyrrole-sensor-designed-for-beef-taste-detection-using-electrochemical-methods-and-sensory-evaluation
#8
Lingtao Zhu, Xiaodan Wang, Yunxiu Han, Yingming Cai, Jiahui Jin, Hongmei Wang, Liping Xu, Ruijia Wu
An electrochemical sensor for detection of beef taste was designed in this study. This sensor was based on the structure of polyvinyl chloride/polypyrrole (PVC/PPy), which was polymerized onto the surface of a platinum (Pt) electrode to form a Pt-PPy-PVC film. Detecting by electrochemical methods, the sensor was well characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The sensor was applied to detect 10 rib-eye beef samples and the accuracy of the new sensor was validated by sensory evaluation and ion sensor detection...
November 4, 2017: Meat Science
https://www.readbyqxmd.com/read/29149074/central-cns-and-peripheral-gastric-tissue-selective-monitoring-of-somatostatin-srif-with-micro-sensor-and-voltammetry-in-rats-influence-of-growth-factors-gh-egf
#9
Francesco Crespi
Somatostatin (SRIF) is widely distributed throughout the body, and regulates the endocrine system via interactions with various hormones, including the pituitary growth hormone, the thyroid stimulating hormone and the majority of the hormones of the gastrointestinal tract. SRIF is present in the central nervous system (CNS), where it affects rates of neurotransmission, and is also reported to be active in the intestinal tract, with evidence that stressed rats present a significant decrease in antral somatostatin-like immunoreactivity (SLI)...
November 17, 2017: Biosensors
https://www.readbyqxmd.com/read/29147003/real-time-wash-free-detection-of-unlabeled-pna-dna-hybridization-using-discrete-fet-sensor
#10
Matti Kaisti, Anssi Kerko, Eero Aarikka, Petri Saviranta, Zhanna Boeva, Tero Soukka, Ari Lehmusvuori
We demonstrate an electrochemical sensor for detection of unlabeled single-stranded DNA using peptide nucleic acid (PNA) probes coupled to the field-effect transistor (FET) gate. The label-free detection relies on the intrinsic charge of the DNA backbone. Similar detection schemes have mainly concentrated on sensitivity improvement with an emphasis on new sensor structures. Our approach focuses on using an extended-gate that separates the FET and the sensing electrode yielding a simple and mass fabricable device...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29144384/mediator-preference-of-two-different-fad-dependent-glucose-dehydrogenases-employed-in-disposable-enzyme-glucose-sensors
#11
Noya Loew, Wakako Tsugawa, Daichi Nagae, Katsuhiro Kojima, Koji Sode
Most commercially available electrochemical enzyme sensor strips for the measurement of blood glucose use an artificial electron mediator to transfer electrons from the active side of the enzyme to the electrode. One mediator recently gaining attention for commercial sensor strips is hexaammineruthenium(III) chloride. In this study, we investigate and compare the preference of enzyme electrodes with two different FAD-dependent glucose dehydrogenases (FADGDHs) for the mediators hexaammineruthenium(III) chloride, potassium ferricyanide (the most common mediator in commercial sensor strips), and methoxy phenazine methosulfate (mPMS)...
November 16, 2017: Sensors
https://www.readbyqxmd.com/read/29144124/ionic-liquid-microstrips-impregnated-with-magnetic-nano-stirrers-for-sensitive-gas-sensors
#12
Richard Gondosiswanto, David Brynn Hibbert, Yu Fang, Chuan Zhao
Ionic liquids have been regarded as promising electrolytes as substitutes for volatile aqueous or organic solvents for electrochemical gas sensors. However ionic liquids are viscous and the slow diffusion of gas molecules leads to poor sensitivity and sluggish response times. Herein, we describe a strategy using an array of microstrips of ionic liquid containing magnetic nanoparticles as nano-stirrers for enhanced mass transport and gas sensing. Magnetic CoFe2O4 nanoparticles are synthesized and dispersed in a hydrophobic ionic liquid [BMP][Ntf2]...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29140294/a-human-body-pressure-distribution-imaging-system-based-on-wavelet-analysis-and-resistance-tomography
#13
Shuanfeng Zhao, Wenbo Wang, Wei Guo, Chuanwei Zhang
In this paper, a pressure distribution sensing system based on wavelet analysis and resistance tomography is proposed to overcome the shortcomings of a traditional electrode type pressure distribution sensor, which needs to be arranged with many electrodes and has a high production cost. The system uses ADS1256, a constant current source module, a serial communication module, a Raspberry host, a touch screen, and other components. The wavelet transform is used to preprocess the collected signal to improve the anti-jamming performance of the system...
November 15, 2017: Sensors
https://www.readbyqxmd.com/read/29140281/non-contact-sensor-for-long-term-continuous-vital-signs-monitoring-a-review-on-intelligent-phased-array-doppler-sensor-design
#14
REVIEW
Travis Hall, Donald Y C Lie, Tam Q Nguyen, Jill C Mayeda, Paul E Lie, Jerry Lopez, Ron E Banister
It has been the dream of many scientists and engineers to realize a non-contact remote sensing system that can perform continuous, accurate and long-term monitoring of human vital signs as we have seen in many Sci-Fi movies. Having an intelligible sensor system that can measure and record key vital signs (such as heart rates and respiration rates) remotely and continuously without touching the patients, for example, can be an invaluable tool for physicians who need to make rapid life-and-death decisions. Such a sensor system can also effectively help physicians and patients making better informed decisions when patients' long-term vital signs data is available...
November 15, 2017: Sensors
https://www.readbyqxmd.com/read/29139288/dissolution-of-pt-during-oxygen-reduction-reaction-produces-pt-nanoparticles
#15
Je Hyun Bae, Ricardo F Brocenschi, Kim Kisslinger, Huolin L Xin, Michael V Mirkin
The loss of Pt during the oxygen reduction reaction (ORR) affects the performance and economic viability of fuel cells and sensors. Our group previously observed the dissolution of Pt nanoelectrodes at moderately negative potentials during the ORR. Here we report a more detailed study of this process and identify its product. The nanoporous Pt surface formed during the ORR was visualized by AFM and high-resolution SEM, which also showed ∼5 nm sized Pt particles on the glass surface surrounding the electrode...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29138950/improvement-of-amperometric-transducer-selectivity-using-nanosized-phenylenediamine-films
#16
O V Soldatkina, I S Kucherenko, V M Pyeshkova, S A Alekseev, O O Soldatkin, S V Dzyadevych
In this work, we studied the conditions of deposition of a semipermeable polyphenylenediamine (PPD)-based membrane on amperometric disk platinum electrodes. Restricting an access of interfering substances to the electrode surface, the membrane prevents their impact on the sensor operation. Two methods of membrane deposition by electropolymerization were compared-at varying potential (cyclic voltammetry) and at constant potential. The cyclic voltammetry was shown to be easier in performing and providing better properties of the membrane...
November 14, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29137797/fabrication-of-g-c3n4-nio-heterostructured-nanocomposite-modified-glassy-carbon-electrode-for-quercetin-biosensor
#17
S Selvarajan, A Suganthi, M Rajarajan
Herein, we report a one-pot synthesis of structurally uniform and electrochemically active graphitic carbon nitride/nickel oxide (g-C3N4/NiO) nanocomposite and an investigation on the electrocatalytic oxidation of quercetin (QR). The synthesized g-C3N4/NiO nanocomposite has uniform surface distribution, which was characterized with scanning electron microscopy (SEM). Moreover, the composition of synthesized g-C3N4/NiO nanocomposite was characterized by UV-vis-spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR spectra), BET, SEM and HRTEM...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137115/cost-effective-and-handmade-paper-based-immunosensing-device-for-electrochemical-detection-of-influenza-virus
#18
Sivaranjani Devarakonda, Renu Singh, Jyoti Bhardwaj, Jaesung Jang
Although many studies concerning the detection of influenza virus have been published, a paper-based, label-free electrochemical immunosensor has never been reported. Here, we present a cost-effective, handmade paper-based immunosensor for label-free electrochemical detection of influenza virus H1N1. This immunosensor was prepared by modifying paper with a spray of hydrophobic silica nanoparticles, and using stencil-printed electrodes. We used a glass vaporizer to spray the hydrophobic silica nanoparticles onto the paper, rendering it super-hydrophobic...
November 11, 2017: Sensors
https://www.readbyqxmd.com/read/29136889/carbon-nanostructured-films-modified-by-metal-nanoparticles-supported-on-filtering-membranes-for-electroanalysis
#19
Erica Paramo, Susana Palmero, Aranzazu Heras, Alvaro Colina
A novel methodology to prepare sensors based on carbon nanostructures electrodes modified by metal nanoparticles is proposed. As a proof of concept, a novel bismuth nanoparticle/carbon nanofiber (Bi-NPs/CNF) electrode and a carbon nanotube (CNT)/gold nanoparticle (Au-NPs) have been developed. Bi-NPs/CNF films were prepared by 1) filtering a dispersion of CNFs on a polytetrafluorethylene (PTFE) filter, and 2) filtering a dispersion of Bi-NPs chemically synthesized through this CNF/PTFE film. Next the electrode is prepared by sticking the Bi-NPs/CNF/PTFE film on a PET substrate...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136884/electrooxidation-and-amperometric-determination-of-vorinostat-on-hierarchical-leaf-like-gold-nanolayers
#20
R Dehdari Vais, K Karimian, H Heli
Hierarchical leaf-like gold nanolayers were electrodeposited using choline chloride as a shape directing agent and characterized using field emission scanning electron microscopy. The electrooxidation behavior of vorinostat was then studied on the nanolayers and the kinetic parameters of the electrodic process were obtained by voltammetric measurements in a phosphate buffer solution at pH 7.40. Vorinostat was electrooxidized on the nanolayers' surface at a lower potential and with a higher rate, compared to a polycrystalline smooth gold surface, through an irreversible process...
February 1, 2018: Talanta
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