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Kulandaivel Sivasankar, Karuppasamy Kohila Rani, Sea-Fue Wang, Rajkumar Devasenathipathy, Chia-Her Lin
Copper nanoparticles with the diameter of 50 ± 20 nm decorated nitrogen doped graphite oxide (NGO) have been prepared through a simple single step carbonization method using copper metal-organic framework (MOF), [Cu₂(BDC)₂(DABCO)] (where BDC is 1,4-benzenedicarboxylate, and DABCO is 1,4-Diazabicyclo[2.2.2]octane) as precursor. The surface morphology, porosity, surface area and elemental composition of CuNPs/NGO were characterized by various techniques. The as-synthesized CuNPs/NGO nanomaterials were coated on commercially available disposable screen-printed carbon electrode for the sensitive determination of glucose...
June 13, 2018: Nanomaterials
Fengling Zhang, Hongbin Zhong, Ying Lin, Miaoxuan Chen, Qingshui Wang, Yao Lin, Jiyi Huang
An enzyme-free electrochemical immunoassay is described for the neutrophil gelatinase-associated lipocalin (NGAL; a biomarker of kidney disease). Prussian Blue (PB) nanoparticles with redox activity were deposited on graphitic C3 N4 nanosheets (g-C3 N4 ) by in-situ reduction. A screen printed electrode (SPCE) was modified with antibody against NGAL, and the PB-g-C3 N4 nanohybrid was used as the signal-generating tag for the secondary antibody against NGAL. Upon addition of target NGAL and of secondary antibody, a sandwich is formed on the SPCE...
June 12, 2018: Mikrochimica Acta
Shicheng Yu, Andreas Mertens, Hermann Tempel, Roland Schierholz, Hans Kungl, Rüdiger-A Eichel
High interfacial resistance in between solid electrolyte and electrode of ceramic all-solid-state batteries is a major reason for the reduced performance of these batteries. A solid state battery using a monolithic all-phosphate concept based on screen printed thick LiTi2 (PO4 )3 anode and Li3 V2 (PO4 )3 cathode composite layers on a densely sintered Li1.3 Al0.3 Ti1.7 (PO4 )3 solid electrolyte has been realized with competitive cycling performance. The choice of materials was primarily based on the (electro-)chemical and mechanical matching of the components instead of a solely focusing on high-performance...
June 12, 2018: ACS Applied Materials & Interfaces
Gastón D Pierini, Christopher W Foster, Samuel J Rowley-Neale, Héctor Fernández, Craig E Banks
Screen-printed electrodes (SPEs) are ubiquitous with the field of electrochemistry allowing researchers to translate sensors from the laboratory to the field. In this paper, we report an electrochemically driven intercalation process where an electrochemical reaction uses an electrolyte as a conductive medium as well as the intercalation source, which is followed by exfoliation and heating/drying via microwave irradiation, and applied to the working electrode of screen-printed electrodes/sensors (termed EDI-SPEs) for the first time...
June 12, 2018: Analyst
Akihiro Tsuruta, Toshio Itoh, Masashi Mikami, Yoshiaki Kinemuchi, Ichiro Terasaki, Norimitsu Murayama, Woosuck Shin
We have constructed a gas sensor of SnO₂ equipped with ceramic electrodes and a heater made of CaCu₃Ru₄O12 , which demonstrated good device performance at high temperature. The CaCu₃Ru₄O12 -based electrodes and heater were formed on Al₂O₃ substrates using a screen-printing process, which is cost-effective and suitable for mass-production. This all-ceramic device reached 600 °C at the lowest, and remained intact after one week of operation at 500 °C and rapid thermal cycling of 500 °C temperature changes within 10 s...
June 11, 2018: Materials
Alejandro García-Miranda Ferrari, Christopher W Foster, Peter J Kelly, Dale A C Brownson, Craig E Banks
Screen-printed electrochemical sensing platforms, due to their scales of economy and high reproducibility, can provide a useful approach to translate laboratory-based electrochemistry into the field. An important factor when utilising screen-printed electrodes (SPEs) is the determination of their real electrochemical surface area, which allows for the benchmarking of these SPEs and is an important parameter in quality control. In this paper, we consider the use of cyclic voltammetry and chronocoulometry to allow for the determination of the real electrochemical area of screen-printed electrochemical sensing platforms, highlighting to experimentalists the various parameters that need to be diligently considered and controlled in order to obtain useful measurements of the real electroactive area...
June 8, 2018: Biosensors
Gonzalo Martínez-García, Esther Sánchez-Tirado, Araceli González-Cortés, Paloma Yáñez-Sedeño, José M Pingarrón
Amylin (the islet amyloid polypeptide) is a hormone related to adiposity, hunger and satiety. It is co-secreted with insulin from pancreatic B-cells. An amperometric immunosensor is presented here for the determination of amylin. It is making use of a screen printed carbon electrode (SPCE) functionalized with electropolymerized poly(pyrrole propionic acid) (pPPA) with abundant carboxyl groups that facilitate covalent binding of antibody against amylin. A competitive immunoassay was implemented using biotinylated amylin and streptavidin labeled with horse radish peroxidase (HRP-Strept) as the enzymatic tracer...
June 9, 2018: Mikrochimica Acta
Mouna Messaoud, Cyril Marsiquet, Frédéric Revol-Cavalier, Venceslass Rat, Gilles Marchand
OBJECTIVE: Few studies have investigated methods to monitor the moisture distribution and filling percentage of dressings during wound management. In this study, a new system allowing moisture monitoring across the wound dressing to be measured is examined. METHOD: The system is composed of a wound bed model with a fluid injection system to mimic exudate flow, a flexible sensor array and data acquisition software. The sensor is composed of 14 flexible electrode arrays, screen-printed on a flexible support and placed on the top of a wound dressing...
June 2, 2018: Journal of Wound Care
Doyeon Lee, Young Ju Lee, Young-Gyu Eun, Gi-Ja Lee
Detection of salivary pepsin has been given attention as a new diagnostic tool for laryngopharyngeal reflux (LPR) disease, because saliva collection is non-invasive and relatively comfortable. In this study, we prepared polypyrrole nanocorals (PPNCs) on a screen-printed carbon electrode (SPCE) by a soft template synthesis method, using β-naphthalenesulfonic acid (NSA) (for short, PPNCs/SPCE). Gold nanoparticles (GNPs) were then decorated on PPNCs/SPCE by electrodeposition (for short, GNP/PPNCs/SPCE)...
May 24, 2018: Sensors
Jun Zhao, Shuyuan Cui, Xingang Zhang, Wenqing Li
A smart synthetic method is conceived to construct large batches of ZnO nanostructures to meet market demand for light-emitting diodes. Utilizing the localized surface plasmon resonance of metal nanoparticles (NPs) facilitates the recombination of electron-hole pairs and the release of photons. Compared to raw ZnO nanorods (NRs), ZnO NRs@HfO2@Al NPs show a ~120× enhancement in ultraviolet photoluminescence (PL), while ZnO NRs@HfO2@Ag NPs show a six-fold enhancement. Because the surface plasmon energy of Al is nearer the ZnO band gap, the PL enhancement of ZnO NRs covered with Al is stronger than that of those covered
 with Ag...
June 8, 2018: Nanotechnology
Mohamed Shehata Draz, Manasa Venkataramani, Harini Lakshminarayanan, Ecem Saygili, Maryam Moazeni, Anish Vasan, Yudong Li, Xiaoming Sun, Stephane Hua, Xu G Yu, Hadi Shafiee
Zika virus (ZIKV) is a reemerging flavivirus causing an ongoing pandemic and public health emergency worldwide. There are currently no effective vaccines or specific therapy for Zika infection. Rapid, low-cost diagnostics for mass screening and early detection are of paramount importance in timely management of the infection at the point-of-care (POC). The current Zika diagnostics are laboratory-based and cannot be implemented at the POC particularly in resource-limited settings. Here, we develop a nanoparticle-enhanced viral lysate electrical sensing assay for Zika virus detection on paper microchips with printed electrodes...
June 8, 2018: Nanoscale
Ebru Dündar Yenilmez, Umut Kökbaş, Kezban Kartlaşmış, Levent Kayrın, Abdullah Tuli
Prenatal detection of the fetal RHD status can be useful in the management of RhD incompatibility to identify fetuses at risk of hemolytic disease. Hemolytic disease causes morbidity and mortality of the fetus in the neonatal period. The routine use of antenatal and postnatal anti-D prophylaxis has reduced the incidence of hemolytic disease of the fetus and newborn. This study describe the detection of fetal RhD antigens in blood of RhD negative pregnant women using a nanopolymer coated electrochemical biosensor for medical diagnosis...
2018: PloS One
Harry M Cronin, Zlatka Stoeva, Martin Brown, Maxim Shkunov, S Ravi P P Silva
Printing of highly conductive tracks at low cost is of primary importance for the emerging field of flexible, plastic and large area electronics. Commonly, this is achieved by printing of metallic conductive inks, often based on Ag or Cu nanoparticles dispersed in organic solvents. The solvents must be safely removed and have particular storage and handling requirements, increasing process costs. By using water-based inks containing micron-sized silver flakes both material and process costs can be reduced, making these inks attractive for industrial applications...
June 4, 2018: ACS Applied Materials & Interfaces
Zhen Gu, Hui-Xin Liu, Yi-Lun Ying, Guangli Xiu, Yi-Tao Long
To enable electrochemistry-based sensors to be applied under size and cost sensitive conditions, we developed a thumb-size electrochemistry instrument system (MiniEC) with integrated components including an electrochemical sensing interface, signal transduction, amplification, filtering, processing and transmission with a cost of around only $15. We showed its potential application for electrochemical studies and on-site environmental monitoring in a wide range of environments such as laboratory, household, countryside, industry or wild settings...
May 31, 2018: Analyst
Abdulhadee Yakoh, Ruslan Alvarez-Diduk, Orawon Chailapakul, Arben Merkoçi
A screen-printed electroluminescent display with different sensing capabilities is presented. The sensing principle is based on the direct relationship between the light intensity of the lamp and the conductivity of the external layers. The proposed device is able to detect the ionic concentration of any conductive species. Using both top and bottom emission architectures, for the first time, a humidity sensor based on electroluminescent display functionalized by graphene oxide nanocomposite is introduced. In this regard, just by coupling the display to a smartphone camera sensor, its potential was expanded for automatically monitoring human respiration in real time...
May 30, 2018: ACS Applied Materials & Interfaces
Rami Masamrekh, Alexey Kuzikov, Alexander Veselovsky, Iliya Toropygin, Tatsiana Shkel, Natalia Strushkevich, Andrei Gilep, Sergey Usanov, Alexander Archakov, Victoria Shumyantseva
Abiraterone and galeterone induce type I differential spectral changes in human sterol 14α-demethylase (cytochrome P450 51A1, CYP51A1) with the sigmoidal shape of the binding curve. After approximation of the data by Hill model, the half-saturation concentrations (K0.5 ) were estimated as 22 ± 1 μM and 16 ± 1 μM and the Hill coefficients as 2.4 ± 0.2 and 1.97 ± 0.23 for abiraterone and galeterone, respectively. We analyzed the catalytic activity of CYP51A1 towards abiraterone and galeterone using an electrochemical system based on recombinant CYP51A1 immobilized on the screen-printed graphite electrode (SPE) modified by didodecyldimethylammonium bromide (DDAB) film...
May 21, 2018: Journal of Inorganic Biochemistry
Pengfei Niu, Martí Gich, Anna Roig, César Fernández-Sánchez
The synthesis of organic-inorganic nanocomposites that can interact with different environmental pollutants and can be mass-produced are very promising materials for the fabrication of chemical sensor devices. Among them, metal (or metal oxide) nanoparticles doped conductive porous carbon composites can be readily applied to the production of electrochemical sensors and show enhanced sensitivity for the measurement of water pollutants, thanks to the abundant accessible and functional sites provided by the interconnected porosity and the metallic nanoparticles, respectively...
May 27, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Tawfik A Khattab, Mohamed Rehan, Tamer Hamouda
Smart clothing can be defined as textiles that respond to a certain stimulus accompanied by a change in their properties. A specific class herein is the photochromic and fluorescent textiles that change color with light. A photochromic and fluorescent cotton fabric based on pigment printing is obtained. Such fabric is prepared by aqueous-based pigment-binder printing formulation containing inorganic pigment phosphor characterized by good photo- and thermal stability. It exhibits optimal excitation wavelength (365 nm) results in color and fluorescence change of the fabric surface...
September 1, 2018: Carbohydrate Polymers
Panuvat Chutichetpong, Nopchulee Cheeveewattanagul, Prapaporn Srilohasin, Patsamon Rijiravanich, Angkana Chaiprasert, Werasak Surareungchai
Drug susceptibility testing (DST) for Mycobacterium tuberculosis currently faces multiple challenges, including lengthy ineffective standard methods, the expensive cost of molecular tests, and large bulky diagnostic machines. In this work, a disposable MPT64 sensor was developed to rapidly determine drug susceptibility (DS-TB) and multidrug resistant tuberculosis (MDR-TB) using an electrochemical sandwich-immunosensor for the detection of MPT64 as an indicator of Mycobacterium tuberculosis growth. Anti-MPT64 (as capture antibody; cAb) was immobilised on screen printed carbon electrodes to specifically bind with MPT64 target protein...
September 26, 2018: Analytica Chimica Acta
Susheel K Mittal, Sonia Rana, Navneet Kaur, Craig E Banks
Herein, a potent electrochemical ionophore (SMS-2) based on a Schiff base has been used for the modification of a screen-printed electrode (SPE). The modified disposable electrode can selectively detect ferric ions in an aqueous medium. Redox behavior of the proposed strip was characterized using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Incorporation of the ligand in the ink of the SPE enhanced the analytical performance of the electrode, and its surface modification was confirmed by SEM and EDX analysis...
May 23, 2018: Analyst
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