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electrode sensor

Andrea Knöller, Stefan Kilper, Achim Diem, Marc Widenmeyer, Tomce Runcevski, Robert E Dinnebier, Joachim Bill, Zaklina Burghard
The demand to outperform current technologies pushes scientists to develop novel strategies to enable fabricating materials with exceptional properties. Along this line, lightweight structural materials are of great interest due to their versatile applicability as sensors, catalysts, battery electrodes and acoustic or mechanical dampers. Here we report a strategy to design ultralight (ρ = 3 mg/cm3) and hierarchically structured ceramic scaffolds of macroscopic size. Such scaffolds exhibit mechanical reversibility comparable to that of microscopic metamaterials, leading to a macroscopically remarkable dynamic mechanical performance...
March 20, 2018: Nano Letters
Shan-Shan Li, Wen-Yi Zhou, Min Jiang, Zheng Guo, Jinhuai Liu, Lizhi Zhang, Xing-Jiu Huang
Developing a new ultra-sensitive interface to detect As(III) is highly desirable because of its seriously toxic and low concentration in drinking water. Recently, Fe3O4 nanoparticles of high adsorption toward As(III) become very promising to be such an interface, which is still limited by the poor understanding of their surface physicochemical properties. Herein, we report that dumbbell-like Au/Fe3O4 nanoparticles, when being modified the screen-printed carbon electrode, can serve as an efficient sensing interface for As(III) detection with an excellent sensitivity of 9...
March 20, 2018: Analytical Chemistry
Sukanya Ramaraj, Sakthivel Mani, Shen-Ming Chen, Selvakumar Palanisamy, Vijayalakshmi Velusamy, James M Hall, Tse-Wei Chen, Tien-Wen Tseng
We report a simple hydrothermal method used for the synthesis of Cr2 Se3 hexagons (h-Cr2 Se3 ) and its application towards electrochemical sensing of 4-nitrophenol (4-NP). The formation of h-Cr2 Se3 was confirmed by using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical activity of the h-Cr2 Se3 modified screen-printed carbon electrode (SPCE) towards 4-NP was studied using cyclic voltammetry (CV) and amperometric i-t techniques...
March 19, 2018: Scientific Reports
Tao Zhang, Yang Hou, Volodymyr Dzhagan, Zhongquan Liao, Guoliang Chai, Markus Löffler, Davide Olianas, Alberto Milani, Shunqi Xu, Matteo Tommasini, Dietrich R T Zahn, Zhikun Zheng, Ehrenfried Zschech, Rainer Jordan, Xinliang Feng
The engineering of acetylenic carbon-rich nanostructures has great potential in many applications, such as nanoelectronics, chemical sensors, energy storage, and conversion, etc. Here we show the synthesis of acetylenic carbon-rich nanofibers via copper-surface-mediated Glaser polycondensation of 1,3,5-triethynylbenzene on a variety of conducting (e.g., copper, graphite, fluorine-doped tin oxide, and titanium) and non-conducting (e.g., Kapton, glass, and silicon dioxide) substrates. The obtained nanofibers (with optical bandgap of 2...
March 19, 2018: Nature Communications
Mohamed M El-Wekil, Ashraf M Mahmoud, Saad A Alkahtani, Adel A Marzouk, Ramadan Ali
Novel and sensitive electrochemical sensor was fabricated for the assay of anti-HCV ledipasvir (LEDV) in different matrices. The designed sensor was based on 3D spinel ferromagnetic NiFe2 O4 nanospheres and reduced graphene oxide (RGO) supported by morpholinium acid sulphate (MHS), as an ionic liquid (RGO/NSNiFe2 O4 /MHS). This sensor design was assigned to synergistically tailor the unique properties of nanostructured ferrites, RGO, and ionic liquid to maximize the sensor response. Electrode modification prevented aggregation of NiFe2 O4, increasing electroactive surface area and allowed remarkable electro-catalytic oxidation of LEDV with an enhanced oxidation response...
March 11, 2018: Biosensors & Bioelectronics
Ye Zhang, Jiangna Guo, Dan Xu, Yi Sun, Feng Yan
Copper nanowires (Cu NWs) have become a promising material for flexible transparent conductive electrodes (FTCEs) owing to the outstanding transparency and conductivity properties. In this work, ultralong Cu NWs with an average length over 250 μm and diameter around 50 nm (aspect ratio ~5000) were synthesized in water/polyhydric alcohol co-solvent. The effects of polyhydric alcohols (including ethanol, ethylene glycol and glycerol) on the aspect ratio of Cu NWs were investigated. The diameter of Cu NWs decreased with the increased number of hydroxyl groups of polyhydric alcohols...
March 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Silan Bai, Qiong Hu, Qiang Zeng, Min Wang, Lishi Wang
Herein, we reported the fabrication of conjugated microporous polymer (CMP) films based on three thiophene derivatives using a one-step templateless electropolymerization in dichloromethane without any surfactants. The formation of hydrophilic or hydrophobic films with specific morphology is a comprehensive result of the polymerization sites in each monomer, the polymerization rate and the gas bubble produced in situ during the polymerization process, which can be easily controlled by the experimental conditions, such as electropolymerization method, electrolyte and "trace water" existed in the organic solvent...
March 17, 2018: ACS Applied Materials & Interfaces
Ahmed Ma'mun, Mohamed K Abd El-Rahman, Mohamed Abd El-Kawy
In recent years, the whole field of ion-selective electrodes(ISEs) in pharmaceutical sciences has expanded far beyond its original roots. The diverse range of opportunities offered by ISEs was broadly used in a number of pharmaceutical applications, with topics presented ranging from bioanalysis of drugs and metabolites, to protein binding studies, green analytical chemistry, impurity profiling, and drug dissolution in biorelevant media. Inspired from these advances and with the aim of extending the functional capabilities of ISEs, the primary focus of the present paper is the utilization of ISE as a tool in personalized medicine...
February 7, 2018: Journal of Pharmaceutical and Biomedical Analysis
Kshiti Singh, Nimisha Jadon, Rajeev Jain
Titanium oxide nanoparticles and 1-butyl-2,3-dimethylimidazolium bis (trifluoromethanesulfonyl) imide modified glassy carbon electrode (TiO2 /IL/GCE) has been fabricated for electrochemical sensing of flunarizine (FRH). The electrochemical properties and morphology of the prepared nanocomposite were studied by electrochemical impedance spectroscopy (EIS) and transmission electron microscopy (TEM). The response of the electrochemical sensor was found to be proportional to the concentrations of FRH in the range from 0...
March 2, 2018: Colloids and Surfaces. B, Biointerfaces
Kai Lu, Wen Huang, Junxiong Guo, Tianxun Gong, Xiongbang Wei, Bing-Wei Lu, Si-Yi Liu, Bin Yu
A flexible 4 × 4 sensor array with 16 micro-scale capacitive units has been demonstrated based on flexible piezoelectric poly(vinylidene fluoride) (PVDF) film. The piezoelectricity and surface morphology of the PVDF were examined by optical imaging and piezoresponse force microscopy (PFM). The PFM shows phase contrast, indicating clear interface between the PVDF and electrode. The electro-mechanical properties show that the sensor exhibits excellent output response and an ultra-high signal-to-noise ratio...
March 14, 2018: Nanoscale Research Letters
Daejong Yang, Jaehwan Lee, Donghwan Kim, Incheol Cho, Jong G Ok, Inkyu Park
We propose ZnO nanowire and TiO2 nanotube based light sensors on flexible polymer substrates fabricated by localized hydrothermal synthesis and liquid phase deposition (LPD). This method realized simple and cost-effective in-situ synthesis and integration of ZnO and TiO2 one dimensional nanomaterials. The fabricated sensor devices with ZnO nanowires and TiO2 nanotubes show very high sensitivity and quick response to the ultraviolet (UV) and ambient light, respectively. In addition, our direct synthesis and integration method made mechanical robustness under external loading such as static and cyclic bending because of both the strong bonding between nanomaterial and electrode...
March 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Vijendra Singh Bhati, Sapana Ranwa, Saravanan Rajamani, Kusum Kumari, Ramesh Raliya, Pratim Biswas, Mahesh Kumar
We report enhanced hydrogen gas sensing performance of Ni doped ZnO sensor decorated with optimum concentration of reduced graphene oxide (rGO). Ni doped ZnO nanoplates were grown by the radio frequency (RF) sputtering, rGO was synthesized by Hummer's method and decorated by drop cast method of various concentration of rGO (0- 1.5 wt%). Current- voltage characteristics of rGO loaded sensor is highly influenced by loading concentration of rGO where current conduction decreases and sensor resistance increases as rGO concentration is increased up to 0...
March 14, 2018: ACS Applied Materials & Interfaces
Bao-Shan He, Xiao-Hai Yan
In this paper, we present a simple and feasible electrochemical sensor based on Au nanoparticle-functionalized graphene for the determination of sulfanilamide. Au nanoparticles were deposited on graphene, which acted as a platform to prepare excellent nanocomposites. Attributed to the graphene's large surface area and the Au nanoparticles' strong conductivity, many sulfanilamide molecules were enriched on the sensor surface and the signal response became more sensitive. Under the optimal conditions, the electrochemical sensors could be used for the efficient detection of sulfanilamide...
March 13, 2018: Sensors
Nick Polydorides
We propose a numerical framework to simulate the Lorentz Force Electrical Impedance Tomography (LFEIT) measurements on accurate electrode models and an image reconstruction scheme for which data on two pairs of electrodes are sufficient. The adopted finite element-based complete electrode model encompasses the electrode's geometry and contact impedance, accounting for the power losses at the contact interface. The results of our simulation study suggest that electrode modelling has a significant impact on the measurements and electrode model inaccuracies may be detrimental to the image reconstruction...
March 13, 2018: Physiological Measurement
Mackenzie M Honikel, Chi-En Lin, Brittney A Cardinell, Jeffrey T LaBelle, Andrew D Penman
The optimal frequency (OF) of a biomarker in electrochemical impedance spectroscopy (EIS) is the frequency at which the EIS response best reflects the binding of the biomarker to its molecular recognition element. Commonly, biosensors rely on complicated immobilization chemistry to attach biological molecules to the sensor surface, making the direct study of a biomarker's native OF a challenge. Physical adsorption presents a simple immobilization strategy to study the native biomarker's OF, but its utility is often discouraged due to a loss in biological activity...
March 13, 2018: ACS Sensors
Siddhi Khaire, Pramod Gaikwad, Mruthyunjayachari Chattanahalli Devendrachari, Alagar Raja Kottaichamy, Zahid Manzoor Bhat, Swapnil Varhade, Shahid Pottachola Shafi, Ravikumar Thimmappa, Musthafa Ottakam Thotiyl
Electrochemical interfaces invariably generate unipolar electromotive force due to unidirectional nature of electrochemical double layers. Herein we show an unprecedented generation of a time varying bipolar electric field between identical half-cell electrodes induced by tailored interfacial migration of magnetic particles. The periodic oscillation of bipolar electric field is monotonically correlated with velocity dependent torque, opening new electrochemical pathways targeting velocity moni-toring systems...
March 13, 2018: Analytical Chemistry
Edyta Matysiak-Brynda, Barbara Wagner, Michał Bystrzejewski, Ireneusz P Grudzinski, Anna M Nowicka
The way of immobilization of the monoclonal antibody (type IgG) on the electrode surface has a significant effect on the amount of the immobilized protein and in consequence on current signal of protein. Herein, we demonstrate that the application of appropriately functionalized phenyl film allowed us to control the orientation of the antibody (Ab) molecules on the electrode surface. The influence of Ab orientation on the efficiency of antigen-antibody interaction was tested with an example blood plasma protein (ferritin; Ft)...
March 5, 2018: Biosensors & Bioelectronics
Xing Xuan, Hyo S Yoon, Jae Y Park
In this study, a reduced graphene oxide (rGO)-based nanostructured composite working electrode of high quality was successfully microfabricated and micro-patterned on a flexible polyimide substrate using simple low-cost fabrication processes. Gold and platinum alloy nanoparticles were electrochemically deposited onto the microfabricated rGO surface and chitosan-glucose oxidase composites were integrated onto the modified surface of the working electrode to develop a human sweat-based wearable glucose sensor application...
February 27, 2018: Biosensors & Bioelectronics
Tolga Aytug, Matthew S Rager, Wesley Higgins, Forrest G Brown, Gabriel M Veith, Christopher M Rouleau, Hui Wang, Zachary D Hood, Shannon M Mahurin, Richard T Mayes, Pooran C Joshi, Teja Kuruganti
Simple and easily integrated design of flexible and transparent electrode materials affixed to polymer based substrates hold great promise to have a revolutionary impact on the functionality and performance of energy storage devices for many future consumer electronics. Among these applications are touch sensors, roll-up displays, photovoltaic cells, health monitors, wireless sensors, and wearable communication devices. Here, we report an environmentally friendly, simple and versatile approach to produce optically transparent and mechanically flexible all-solid-state supercapacitor devices...
March 12, 2018: ACS Applied Materials & Interfaces
Weijie Liu, Nishuang Liu, Yang Yue, Jiangyu Rao, Feng Cheng, Jun Su, Zhitian Liu, Yihua Gao
Piezoresistive sensor is a promising pressure sensor due to its attractive advantages including uncomplicated signal collection, simple manufacture, economical and practical characteristics. Here, a flexible and highly sensitive pressure sensor based on wrinkled graphene film (WGF)/innerconnected polyvinyl alcohol (PVA) nanowires/interdigital electrodes is fabricated. Due to the synergistic effect between WGF and innerconnected PVA nanowires, the as-prepared pressure sensor realizes a high sensitivity of 28...
March 12, 2018: Small
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