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Xuan Cao, Christian Lau, Yihang Liu, Fanqi Wu, Hui Gui, Qingzhou Liu, Yuqiang Ma, Haochuan Wan, Moh R Amer, Chongwu Zhou
Semiconducting single-wall carbon nanotubes are ideal semiconductors for printed electronics due to their advantageous electrical and mechanical properties, intrinsic printability in solution, and desirable stability in air. However, fully printed, large-area, high-performance, and flexible carbon nanotube active-matrix backplanes are still difficult to realize for future displays and sensing applications. Here, we report fully screen-printed active-matrix electrochromic displays employing carbon nanotube thin-film transistors...
October 17, 2016: ACS Nano
Giovanni Fusco, Francesca Gallo, Cristina Tortolini, Paolo Bollella, Federica Ietto, Antonella De Mico, Andrea D'Annibale, Riccarda Antiochia, Gabriele Favero, Franco Mazzei
In this work, we developed an impedimetric label-free immunosensor for the detection of 2,4-Dichlorophenoxy Acetic Acid (2,4-D) herbicide either in standard solution and spiked real samples. For this purpose, we prepared by electropolymerization a conductive polymer poly-(aniline-co-3-aminobenzoic acid) (PANABA) then we immobilized anti-2,4-D antibody onto a nanocomposite AuNPs-PANABA-MWCNTs employing the carboxylic moieties as anchor sites. The nanocomposite was synthesized by electrochemical polymerization of aniline and 3-aminobenzoic acid, in the presence of a dispersion of gold nanoparticles, onto a multi-walled carbon nanotubes-based screen printed electrode...
October 5, 2016: Biosensors & Bioelectronics
Alexander C Sun, Chengyang Yao, A G Venkatesh, Drew A Hall
Cellular phone penetration has grown continually over the past two decades with the number of connected devices rapidly approaching the total world population. Leveraging the worldwide ubiquity and connectivity of these devices, we developed a mobile phone-based electrochemical biosensor platform for point-of-care (POC) diagnostics and wellness tracking. The platform consists of an inexpensive electronic module (< $20) containing a low-power potentiostat that interfaces with and efficiently harvests power from a wide variety of phones through the audio jack...
November 1, 2016: Sensors and Actuators. B, Chemical
Xiaohui Geng, Fanglin Zhang, Qiang Gao, Yingfeng Lei
A sensitive and disposable electrochemical impedance biosensor to detect Japanese encephalitis virus (JEV) was developed based on a gold nanoparticle (AuNP)-modified screen-printed carbon electrode (SPCE). A biosensor was fabricated through covalent grafting of a mixed self-assembled monolayer on AuNPs with a specific antibody. To detect JEV and achieve signal amplification, the horseradish peroxidase (HRP)-labeled second antibody was linked to the biosensor through a sandwich immunity reaction. HRP was used to catalyze 4-chloro-1-naphthol oxidation to produce an insoluble precipitate, which introduced a barrier to electron transfer on the electrode...
2016: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Zhiyong Xie, Juncui Xu, Fazhi Xie, Shiquan Xiong
A reduced graphene oxide (rGO)/Fe3O4 composites modified screen-printed carbon electrode (SPCE) was used to determinate As(III) in a HAc-NaAc buffer solution. The rGO/Fe3O4 composites were prepared by a simple and one-pot synthesis method, and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), FT-IR and Raman spectra. The electrochemical behaviors of the composite electrode were characterized by cycle voltammetry and electrochemical impedance spectroscopy. The experimental parameters, such as supporting electrolyte, solution pH, deposition potential, deposition time were optimized, respectively...
2016: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Muhammad Zafir Mohamad Nasir, Martin Pumera
Impact electrochemistry provides a useful alternative technique for the detection of silver nanoparticles in solutions. The combined use of impact electrochemistry on screen-printed electrodes (SPEs) for the successful detection of silver nanoparticles provides an avenue for future on-site, point-of-care detection devices to be made for environmental, medicinal and biological uses. Here we discuss the use of screen-printed electrodes for the detection of well-defined monodispersed silver nanoparticles of sizes 10, 20, 40, 80, and 107 nm...
October 12, 2016: Physical Chemistry Chemical Physics: PCCP
Tânia V Pinto, Paula Costa, Céu M Sousa, Carlos A D Sousa, Clara Pereira, Carla J S M Silva, Manuel Fernando R Pereira, Paulo J Coelho, Cristina Freire
Photochromic silica nanoparticles (SiO2@NPT), fabricated through covalent immobilization of silylated naphthopyrans based on 2H-naphtho[1,2-b]pyran (S1, S2) and 3H-naphtho[2,1-b]pyran (S3, S4) or through direct adsorption of parent naphthopyrans (NPT 1, 3) onto silica nanoparticles, were successfully incorporated onto cotton fabrics by screen-printing process. Two aqueous acrylic (AC) and polyurethane (PU)-based inks were used as dispersing media. All textiles exhibited reversible photochromism under UV and solar irradiation, developing fast response and intense coloration...
October 5, 2016: ACS Applied Materials & Interfaces
Célia M Silveira, Tiago Monteiro, Maria Gabriela Almeida
From the bench-mark work on microfluidics from the Whitesides's group in 2007, paper technology has experienced significant growth, particularly regarding applications in biomedical research and clinical diagnostics. Besides the structural properties supporting microfluidics, other advantageous features of paper materials, including their versatility, disposability and low cost, show off the great potential for the development of advanced and eco-friendly analytical tools. Consequently, paper was quickly employed in the field of electrochemical sensors, being an ideal material for producing custom, tailored and miniaturized devices...
2016: Biosensors
Gareth Hughes, Kelly Westmacott, Kevin C Honeychurch, Adrian Crew, Roy M Pemberton, John P Hart
This review describes recent advances in the fabrication of electrochemical (bio)sensors based on screen-printing technology involving carbon materials and their application in biomedical, agri-food and environmental analyses. It will focus on the various strategies employed in the fabrication of screen-printed (bio)sensors, together with their performance characteristics; the application of these devices for the measurement of selected naturally occurring biomolecules, environmental pollutants and toxins will be discussed...
2016: Biosensors
Laura Contat-Rodrigo, Clara Pérez-Fuster, José Vicente Lidón-Roger, Annalisa Bonfiglio, Eduardo García-Breijo
A novel screen-printing fabrication method was used to prepare organic electrochemical transistors (OECTs) based on poly(3,4-ethylenedioxythiophene) doped with polysterene sulfonate (PEDOT:PSS). Initially, three types of these screen-printed OECTs with a different channel and gate areas ratio were compared in terms of output characteristics, transfer characteristics, and current modulation in a phosphate buffered saline (PBS) solution. Results confirm that transistors with a gate electrode larger than the channel exhibit higher modulation...
2016: Sensors
Diego Voccia, Marta Sosnowska, Francesca Bettazzi, Giuseppina Roscigno, Emiliano Fratini, Vittorio De Franciscis, Gerolama Condorelli, Raghu Chitta, Francis D'Souza, Wlodzimierz Kutner, Ilaria Palchetti
Herein, direct determination of small RNAs is described using a functional-polymer modified genosensor. The analytical strategy adopted involves deposition by electropolymerization of biotinylated polythiophene films on the surface of miniaturized, disposable, gold screen-printed electrodes, followed by the layer-by-layer deposition of streptavidin, and then biotynilated capture probes. A small RNA (miR-221) target was determined via the impedimetric measurement of the hybridization event in a label-free and PCR-free approach...
September 17, 2016: Biosensors & Bioelectronics
Xiangheng Niu, Hongwei Zhang, Meihua Yu, Hongli Zhao, Minbo Lan, Chengzhong Yu
Here, the combination of Nafion with microporous hollow carbon spheres (MHCS) is first proposed to fabricate a disposable metal-free electrode for heavy metal stripping sensing. The MHCS-Nafion composite film electrode is prepared by drop-casting a mixture of MHCS and Nafion onto the lab-made screen-printed carbon electrode (SPCE(*)). Results demonstrate that the interfusion of MHCS into Nafion offers enhanced performance for the electro-enrichment and stripping of lead and cadmium over the only Nafion film: 1) abundant MHCS immobilized on the electrode surface serve as effective nucleation sites for metal ion reduction; 2) the mixing of MHCS into Nafion enlarges the active surface of negative-charged Nafion for the electrostatic adsorption of metal cations...
2016: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Miriam Barquero-Quirós, María Julia Arcos-Martínez
A novel amperometric biosensor for the determination of Al(III) based on the inhibition of the enzyme superoxide dismutase has been developed. The oxidation signal of epinephrine substrate was affected by the presence of Al(III) ions leading to a decrease in its amperometric current. The immobilization of the enzyme was performed with glutaraldehyde on screen-printed carbon electrodes modifiedwith tetrathiofulvalene (TTF) and different types ofnanoparticles. Nanoparticles of gold, platinum, rhodium and palladium were deposited on screen printed carbon electrodes by means of two electrochemical procedures...
2016: Sensors
Paloma Yáñez-Sedeño, Susana Campuzano, José M Pingarrón
Ultrasensitive biosensing is currently a growing demand that has led to the development of numerous strategies for signal amplification. In this context, the unique properties of magnetic particles; both of nano- and micro-size dimensions; have proved to be promising materials to be coupled with disposable electrodes for the design of cost-effective electrochemical affinity biosensing platforms. This review addresses, through discussion of selected examples, the way that nano- and micro-magnetic particles (MNPs and MMPs; respectively) have contributed significantly to the development of electrochemical affinity biosensors, including immuno-, DNA, aptamer and other affinity modes...
2016: Sensors
I Gualandi, M Marzocchi, A Achilli, D Cavedale, A Bonfiglio, B Fraboni
The development of wearable chemical sensors is receiving a great deal of attention in view of non-invasive and continuous monitoring of physiological parameters in healthcare applications. This paper describes the development of a fully textile, wearable chemical sensor based on an organic electrochemical transistor (OECT) entirely made of conductive polymer (PEDOT:PSS). The active polymer patterns are deposited into the fabric by screen printing processes, thus allowing the device to actually "disappear" into it...
September 26, 2016: Scientific Reports
Murugan Velmurugan, Balamurugan Thirumalraj, Shen-Ming Chen, Fahad M A Al-Hemaid, M Ajmal Ali, Mohamed S Elshikh
To date, the development of different modified electrodes have received much attention in electrochemistry. The modified electrodes have some drawbacks such as high cost, difficult to handle and not eco friendly. Hence, we report an electrochemical sensor for the determination of palladium ions (Pd(2+)) using an un-modified screen printed carbon electrode has been developed for the first time, which are characterized and studied via scanning electron microscope and cyclic voltammetry. Prior to determination of Pd(2+) ions, the operational conditions of un-modified SPCE was optimized using cyclic voltammetry and showed excellent electro-analytical behavior towards the determination of Pd(2+) ions...
January 1, 2017: Journal of Colloid and Interface Science
Phong Tran Hoang, Nicolas Salazar, Thomas Nolan Porkka, Kunal Joshi, Tao Liu, Tarik J Dickens, Zhibin Yu
We report highly sensitive and reliable strain sensors based on silver nanoparticle (AgNP) and carbon nanotube (CNT) composite thin films. The CNT/AgNP was prepared by a screen printing process using a mixture of a CNT paste and an AgNP ink. It is discovered that the sensitivity of such sensors are highly dependent on the crack formation in the composites. By altering the substrate use and the relative ratios of AgNPs and CNTs, the formation and propagation of cracks can be properly engineered, leading to piezoresistive strain sensors with enhanced sensitivity and robustness...
December 2016: Nanoscale Research Letters
Aamar F Khan, Dale A C Brownson, Edward P Randviir, Graham C Smith, Craig E Banks
Crystalline 2D hexagonal boron nitride (2D-hBN) nanosheets are explored as a potential electrocatalyst toward the electroanalytical sensing of dopamine (DA). The 2D-hBN nanosheets are electrically wired via a drop-casting modification process onto a range of commercially available carbon supporting electrodes, including glassy carbon (GC), boron-doped diamond (BDD), and screen-printed graphitic electrodes (SPEs). 2D-hBN has not previously been explored toward the electrochemical detection/electrochemical sensing of DA...
October 4, 2016: Analytical Chemistry
Chenfan Yang, Xuelong Liu, Tiezheng Lv, Lili Zhao, Can Cui, Yuying Wang, Limei Cha
Here we synthesized a novel Ag/Si composite sub-micro particle using galvanic displacement by capitalizing on the active chemical surface of Si particles sludge from wafer-slicing process. Si works as chemical reactant, as well as reaction site to form composite particles. Sequent structural characterizations and analysis which include X-ray diffraction, transmission electron microscopy, scanning electron microscope, energy dispersive X-ray and electrical properties of this composite particle were done. A well-proved hetero-epitaxial growth mechanism could explain Ag nano-island/layer with a satisfactory bond property deposited on the Si surface...
2016: SpringerPlus
Arnab Halder, Minwei Zhang, Qijin Chi
Design and synthesis of low-cost, highly stable, electroactive and biocompatible material is one of the key steps for the advancement of electrochemical biosensing systems. To this end, we have explored a facile way for the successful synthesis of redox active and bioengineering of reduced graphene oxide (RGO) for the development of versatile biosensing platform. A highly branched polymer (PEI) is used for reduction and simultaneous derivation of graphene oxide (GO) to form a biocompatible polymeric matrix on RGO nanosheet...
September 9, 2016: Biosensors & Bioelectronics
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