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Nikita Gupta, K D Mallikharjuna Rao, Ritu Gupta, Frederik C Krebs, Giridhar U Kulkarni
Despite relatively high manufacturing cost, crystalline-Si solar cell continues to hold promising future due to its high energy conversion efficiency and long life. As regards cost, one pertinent issue is the top electrode metallization of textured cell surface, which typically involves screen printing of silver paste. The associated disadvantages call for alternative methods that can lower the cost without compromising the solar cell efficiency. In the present work, a highly interconnected one dimensional (1D) metal wire network has been employed as front electrode on conventional Si wafers...
February 17, 2017: ACS Applied Materials & Interfaces
Bahaa G Mahmoud, Mohamed Khairy, Farouk A Rashwan, Craig E Banks
To overcome the recent outbreaks of hepatotoxicity-related drugs, a new analytical tool for the continuously determination of these drugs in human fluids is required. Electrochemical-based analytical methods offer an effective, rapid, and simple tool for on-site determination of various organic and inorganic species. However, the design of a sensitive, selective, stable, and reproducible sensor is still a major challenge. In the present manuscript, a facile, one-pot hydrothermal synthesis of bismuth oxide (Bi2O2...
February 7, 2017: Analytical Chemistry
Noordiana Nordin, Nor Azah Yusof, Jaafar Abdullah, Son Radu, Roozbeh Hushiarian
An earlier electrochemical mechanism of DNA detection was adapted and specified for the detection of Vibrio parahaemolyticus in real samples. The reader, based on a screen printed carbon electrode, was modified with polylactide-stabilized gold nanoparticles and methylene blue was employed as the redox indicator. Detection was assessed using a microprocessor to measure current response under controlled potential. The fabricated sensor was able to specifically distinguish complementary, non-complementary and mismatched oligonucleotides...
December 2017: AMB Express
Naushad Khan, Taimur Athar, H Fouad, Ahmad Umar, Z A Ansari, S G Ansari
With an increasing focus on applied research, series of single/composite materials are being investigated for device development to detect several hazardous, dangerous, and toxic molecules. Here, we report a preliminary attempt of an electrochemical sensor fabricated using pristine Ni and Cr-doped nano tin oxide material (SnO2) as a tool to detect agro-hazardous material, i.e. Organophosphate (OP, chlorpyrifos). The nanomaterial was synthesized using the solution method. Nickel and chromium were used as dopant during synthesis...
February 14, 2017: Scientific Reports
Stefano Cinti, Mattia Basso, Danila Moscone, Fabiana Arduini
Herein, we report the first example of a paper-based screen-printed biosensor for the detection of ethanol in beer samples. Common office paper was adopted to fabricate the analytical device. The properties of this paper-based screen-printed electrode (SPE) were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy, and they were compared with the well-established polyester-based SPEs as well. Paper demonstrated similar properties when compared with polyester, highlighting suitability towards its utilization in sensor development, with the advantages of low cost and simple disposal by incineration...
April 1, 2017: Analytica Chimica Acta
María Garranzo-Asensio, Ana Guzman-Aranguez, Carmen Povés, María Jesús Fernández-Aceñero, Rebeca M Torrente-Rodríguez, Víctor Ruiz-Valdepeñas Montiel, Gemma Domínguez, Luis San Frutos, Nuria Rodríguez, Mayte Villalba, José M Pingarrón, Susana Campuzano, Rodrigo Barderas
Autoantibodies raised against tumor-associated antigens have shown high promise as clinical biomarkers for reliable diagnosis, prognosis, and therapy monitoring of cancer. An electrochemical disposable biosensor for the specific and sensitive determination of p53-specific autoantibodies has been developed for the first time in this work. This biosensor involves the use of magnetic microcarriers (MBs) modified with covalently immobilized HaloTag fusion p53 protein as solid supports for the selective capture of specific autoantibodies...
December 20, 2016: Analytical Chemistry
Shushu Ding, Sumei Cao, Anwei Zhu, Guoyue Shi
Signal amplification of chiral interaction is a much needed task for sensing of enantiomers due to nearly identical chemical and physical properties of the chiral isomers. In this article, we established an electrochemical chiral sensing method with high sensitivity and selectivity for monosacharrides based on the stimuli-responsive copolymer/graphene hybrid-modified screen-printed carbon electrodes. The hybrid synthesized by the "grafting from" atom transfer radical polymerization (ATRP) process not only acted as a chiral recognition element but also provided a chiral signal amplification strategy...
December 20, 2016: Analytical Chemistry
Ghulam Hussain, Debbie S Silvester
The voltammetric detection of less than 1 ppm of ammonia gas in the room temperature ionic liquid (RTIL) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][NTf2]) is demonstrated using low-cost planar electrode devices. Three commercially available planar devices were employed, all with platinum (Pt) working electrodes: a thin-film electrode (TFE), a screen-printed electrode (SPE), and a microarray thin film electrode (MATFE), along with an "ideal" conventional Pt microdisk electrode for comparison...
December 20, 2016: Analytical Chemistry
Liangli Cao, Cheng Fang, Ruosheng Zeng, Xiongjie Zhao, Yuren Jiang, Zhencheng Chen
An electrochemical immunofiltration analysis was introduced into microfluidic paper-based analytical devices (μPADs) for the first time, which was based on photolithography and screen-printing technology. The hydrophilic test zones of the aldehyde-functionalized screen-printed electrodes (SPEs) were biofunctionalized with capture antibodies (Ab1). A sensitive immune detection method was developed by using primary signal antibody functionalized gold nanoparticles (GNPs/Ab2) and alkaline phosphatase conjugated secondary antibody (ALP-IgG)...
February 2, 2017: Biosensors & Bioelectronics
J V Meshram, V B Koli, M R Phadatare, S H Pawar
Initially micro-organisms get exposed to the surfaces, this demands development of anti-microbial surfaces to inhibit their proliferation. Therefore, herein, we attempt screen printing technique for development of PVA-GE/ZnO nanocomposite (PG/ZnO) films. The synthesis of PG/ZnO nanocomposite includes two steps as: (i) Coating of Zinc Oxide nanoparticles (ZnO NPs) by poly ethylene glycol in order to be compatible with organic counterparts. (ii) Deposition of coated nanoparticles on the PG film surface. The results suggest the enhancement in anti-microbial activity of PG/ZnO nanocomposite over pure ZnO NPs against both Gram positive Bacillus subtilis and Gram negative Escherichia coli from zone of inhibition...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Vinay Kumar, D M Nikhila Kashyap, Suraj Hebbar, R Swetha, Sujay Prasad, T Kamala, S S Srikanta, P R Krishnaswamy, Navakanta Bhat
Direct Electron Transfer biosensors, facilitating direct communication between the biomolecule of interest and electrode surface, are preferable compared to enzymatic and mediator based sensors. Although hemoglobin (Hb) contains four redox active iron centres, direct detection is not possible due to inaccessibility of iron centres and formation of dimers, blocking electron transfer. Through the coordination of iron with aza-heterocyclic receptors - pyridine and imidazole - we report a cost effective, highly sensitive and simple electrochemical Hb sensor using cyclic voltammetry and chronoamperometry...
February 7, 2017: Scientific Reports
A Abellán-Llobregat, I Jeerapan, A Bandodkar, L Vidal, A Canals, J Wang, E Morallón
Here we present two types of all-printable, highly stretchable, and inexpensive devices based on platinum (Pt)-decorated graphite for glucose determination in physiological fluids. Said devices are: a non-enzymatic sensor and an enzymatic biosensor, the latter showing promising results. Glucose has been quantified by measuring hydrogen peroxide (H2O2) reduction by chronoamperometry at -0.35V (vs pseudo-Ag/AgCl) using glucose oxidase immobilized on Pt-decorated graphite. The sensor performs well for the quantification of glucose in phosphate buffer solution (0...
January 26, 2017: Biosensors & Bioelectronics
Francesca Fontana, Federica Melone, Daniela Iannazzo, Salvatore Leonardi, Giovanni Neri
In this study, we report the preparation of a novel nanocomposite, 5-aza[5]helicene-CH2O-CO-MWCNTs, obtained grafting the 5-aza[5]helicene moiety on the surface of multiwalled carbon nanotubes. TGA, FTIR, UV and PL measurements provided evidences that the organic moiety is covalently grafted to the MWCNTs. The 5-aza[5]helicene-CH2O-CO-MWCNTs nanocomposite was utilized to fabricate modified commercial screen printed carbon electrodes (SPCEs). Its electrochemical behavior was studied in neutral buffer solution in the presence of ferricyanide and hydroquinone (HQ)...
February 6, 2017: Nanotechnology
Zhan Gao, Hongqian Wang, Elizabeth Miller, Qinyuan Liu, Daniel Senn, Scott Barnett
Low-temperature solid oxide cells (LT-SOCs), operating at 400 to 650 °C, have great potential for commercialization since they can provide lower cost and improved long-term durability. Low operating temperature can also enable high round-trip efficiency of SOCs as reversible energy storage devices. This paper describes Sr0.8La0.2TiO3-α (SLT) anode supported LT-SOC with thin La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM) electrolyte made by tape casting, with screen printed La0.6Sr0.4Fe0.8Co0.2O3-δ (LSCF) cathode and impregnated Ni anode...
February 15, 2017: ACS Applied Materials & Interfaces
Daniel Martín-Yerga, Agustín Costa-García
Quantum dots (QDs) have special optical, surface, and electronic properties that make them useful for electrochemical applications. In this work, the electrochemical behavior of copper in ammonia medium is described using bare screen-printed carbon electrodes and the same modified with CdSe/ZnS QDs. At the bare electrodes, the electrogenerated Cu(i) and Cu(0) species are oxidized by dissolved oxygen in a fast coupled chemical reaction, while at the QDs-modified electrode, the re-oxidation of Cu(i) and Cu(0) species can be observed, which indicates that they are stabilized by the nanocrystals present on the electrode surface...
February 6, 2017: Physical Chemistry Chemical Physics: PCCP
Jyotsana Mehta, Neha Bhardwaj, Sanjeev K Bhardwaj, Satish K Tuteja, Priya Vinayak, A K Paul, Ki-Hyun Kim, Akash Deep
The widespread use of pesticides has immense effect on increased crop productions. However, they are also responsible for posing detrimental health hazards and/or for contaminating the environment with chemical residues. A routine and an on-field detection of pesticide residues in different food, water, and soil samples has become a need of the hour for which biosensors can offer a viable alternative. The present work reports a functionalized graphene quantum dot (GQD) based screen printed electrochemical immunosensor for the detection of parathion...
February 2, 2017: Analytical Biochemistry
E Sánchez-Tirado, C Salvo, A González-Cortés, P Yáñez-Sedeño, F Langa, J M Pingarrón
Dual screen-printed carbon electrodes modified with 4-carboxyphenyl-functionalized double-walled carbon nanotubes (HOOC-Phe-DWCNTs/SPCEs) have been used as scaffolds for the preparation of electrochemical immunosensors for the simultaneous determination of the cytokines Interleukin-1β (IL-1β) and factor necrosis tumor α (TNF-α). IL-1β. Capture antibodies were immobilized onto HOOC-Phe-DWCNTs/SPCEs in an oriented form making using the commercial polymeric coating Mix&Go™. Sandwich type immunoassays with amperometric signal amplification through the use of poly-HRP-streptavidin conjugates and H2O2 as HRP substrate and hydroquinone as redox mediator were implemented...
March 22, 2017: Analytica Chimica Acta
Tatsumi Kuretake, Shogo Kawahara, Masanobu Motooka, Shigeyasu Uno
This paper presents a novel method of fabricating an enzymatic biosensor for breath analysis using chromatography paper as enzyme supporting layer and a liquid phase layer on top of screen printed carbon electrodes. We evaluated the performance with ethanol vapor being one of the breathing ingredients. The experimental results show that our sensor is able to measure the concentration of ethanol vapor within the range of 50 to 500 ppm. These results suggest the ability of detecting breath ethanol, and it can possibly be applied as a generic vapor biosensor to a wide range of diseases...
February 1, 2017: Sensors
Joong Tark Han, Byung Kuk Kim, Jong Seok Woo, Jeong In Jang, Joon Young Cho, Hee Jin Jeong, Seung Yol Jeong, Seon Hee Seo, Geon-Woong Lee
Directly printed superhydrophobic surfaces containing conducting nanomaterials can be used for a wide range of applications in terms of nonwetting, anisotropic wetting, and electrical conductivity. Here, we demonstrated that direct-printable and flexible superhydrophobic surfaces were fabricated on flexible substrates via with an ultrafacile and scalable screen printing with carbon nanotube (CNT)-based conducting pastes. A polydimethylsiloxane (PDMS)-polyethylene glycol (PEG) copolymer was used as an additive for conducting pastes to realize the printability of the conducting paste as well as the hydrophobicity of the printed surface...
February 13, 2017: ACS Applied Materials & Interfaces
Daniel Riman, Konstantinos Spyrou, Alexandros E Karantzalis, Jan Hrbac, Mamas I Prodromidis
Electric spark discharge was employed as a green, fast and extremely facile method to modify disposable graphite screen-printed electrodes (SPEs) with copper, nickel and mixed copper/nickel nanoparticles (NPs) in order to be used as nonenzymatic glucose sensors. Direct SPEs-to-metal (copper, nickel or copper/nickel alloys with 25/75, 50/50 and 75/25wt% compositions) sparking at 1.2kV was conducted in the absence of any solutions under ambient conditions. Morphological characterization of the sparked surfaces was performed by scanning electron microscopy, while the chemical composition of the sparked NPs was evaluated with energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy...
April 1, 2017: Talanta
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