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Electroanalytical Chemistry

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https://www.readbyqxmd.com/read/30261251/graphene-and-graphene-oxide-functionalization-and-nano-bio-catalytic-system-for-enzyme-immobilization-and-biotechnological-perspective
#1
REVIEW
Muhammad Adeel, Muhammad Bilal, Tahir Rasheed, Ashutosh Sharma, Hafiz M N Iqbal
Graphene-based nanomaterials have gained high research interest in different fields related to proteins and thus are rapidly becoming the most widely investigated carbon-based materials. Their exceptional physiochemical properties such as electrical, optical, thermal and mechanical strength enable graphene to render graphene-based nanostructured materials suitable for applications in different fields such as electroanalytical chemistry, electrochemical sensors and immobilization of biomolecules and enzymes...
September 24, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30059620/tackling-grand-challenges-of-the-21st-century-with-electroanalytical-chemistry
#2
Jing Li, Zhangquan Peng, Erkang Wang
Modern electroanalytical chemistry, based on an intimate coupling of electrochemical techniques and spectroscopic and imaging methodologies, contains a broad range of very powerful research tools that are invariably characterized by descriptors of in situ, in vivo, real-time, online, etc. This Perspective offers a viewpoint of the authors on part of the grand challenges facing society and our planet in the 21st century, where contemporary analysts, armed with modern electroanalytical chemistry, have the ability to tackle these challenges with unprecedented levels...
August 29, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/30029415/covalent-organic-framework-as-a-novel-electrochemical-platform-for-highly-sensitive-and-stable-detection-of-lead
#3
Ting Zhang, Congwei Gao, Wei Huang, Yuling Chen, Yang Wang, Jianmin Wang
A sensitive and selective TAPB-DMTP-COF (TAPB, 1,3,5-tris(4-aminophenyl)benzene; DMTP, 2,5-dimethoxyterephaldehyde; COF, covalent organic framework) modified carbon paste electrode was evaluated as a novel electrochemical sensor for the determination of lead in an aqueous medium. Lead was accumulated on the TAPB-DMTP-COF surface by the complexation with the amine groups, and detected by differential pulse anodic stripping voltammetry. Due to the distinct structure features of COF, the resulting sensor revealed a fast electron transfer rate and outstanding adsorption capacity for lead...
October 1, 2018: Talanta
https://www.readbyqxmd.com/read/29907281/a-lab-on-a-tip-approach-to-make-electroanalysis-user-friendly-and-de-centralized-detection-of-copper-ions-in-river-water
#4
Stefano Cinti, Vincenzo Mazzaracchio, Gökçe Öztürk, Danila Moscone, Fabiana Arduini
The development of portable and user-friendly sensing platforms is a hot topic in the field of analytical chemistry. Among others, electroanalytical approaches exhibit a high amenability for reaching this purpose, i.e. the commercial strips for diabetes care are an obvious success. However, providing fully-integrated and user-friendly methods is the leitmotiv. In this work we evaluate the use of a disposable pipette tip, opportunely configured, to realize the first example of lab-on-a-tip. The combination of a pipette tip, wire electrodes, and cotton wool filter, highlights the suitability of producing a novel one-shot electroanalytical platform that does not require expertise-required tasks...
October 31, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29887015/effect-of-carbon-black-functionalization-on-the-analytical-performance-of-a-tyrosinase-biosensor-based-on-glassy-carbon-electrode-modified-with-dihexadecylphosphate-film
#5
Gisela Ibáñez-Redín, Tiago Almeida Silva, Fernando Campanhã Vicentini, Orlando Fatibello-Filho
Carbon Black (CB) has acquired a prominent position as a carbon nanomaterial for the development of electrochemical sensors and biosensors due to its low price and extraordinary electrochemical and physical properties. These properties are highly dependent on the surface chemistry and thus, the effect of functionalization has been widely studied for different applications. Meanwhile, the influence of CB functionalization over its properties for electroanalytical applications is still being poorly explored. In this study, we describe the use of chemically functionalized CB Vulcan XC 72R for the development of sensitive electrochemical biosensors...
September 2018: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/29784354/a-comparative-study-of-sterically-and-electro-statically-stabilized-silver-nanoparticles-for-the-determination-of-muscle-relaxant-tizanidine-insights-of-localized-surface-plasmon-resonance-surface-enhanced-raman-spectroscopy-and-electrocatalytic-activity
#6
COMPARATIVE STUDY
Marwa R El-Zahry
A comparative study of two types of silver nanoparticles was investigated. The effect of the surface chemistry of the studied silver nanoparticles (AgNPs) on their localized surface plasmon resonance was utilized for the quantitative determination of muscle relaxant tizanidine drug. The studied AgNPs are classified according to the type of stabilizing agent used in their synthesis into electrostatically and sterically stabilized AgNPs. The electrostatically-stabilized AgNPs (AA AgNPs) were prepared using ascorbic acid as both reducing and protective agents in alkaline medium...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29627667/electrochemical-study-of-acetaminophen-oxidation-by-gold-nanoparticles-supported-on-a-leaf-like-zeolitic-imidazolate-framework
#7
Lei Wang, Tianjiao Meng, Yanwei Fan, Chunxia Chen, Ziwei Guo, Huan Wang, Yufan Zhang
Decoration of leaf-like zeolitic imidazolate framework (ZIF-L) with Au nanoparticles (NPs) by a simple self-assembly method was described in this work. The materials were characterized by Fourier transform infrared spectroscopy, energy-dispersive X-ray spectra, N2 adsorption, and thermogravimetric analysis. Acetaminophen (AP) is most commonly referred to as an over-the-counter antipyretic and analgesic, which is a key factor in relieving fever and pain. It is particular significant to take efforts and conduct research for the development of reliable methods to detect the AP...
August 15, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29542799/layer-by-layer-assembly-of-mxene-and-carbon-nanotubes-on-electrospun-polymer-films-for-flexible-energy-storage
#8
Zehang Zhou, Weerapha Panatdasirisuk, Tyler S Mathis, Babak Anasori, Canhui Lu, Xinxing Zhang, Zhiwei Liao, Yury Gogotsi, Shu Yang
Free-standing, highly flexible and foldable supercapacitor electrodes were fabricated through the spray-coating assisted layer-by-layer assembly of Ti3C2Tx (MXene) nanoflakes together with multi-walled carbon nanotubes (MWCNTs) on electrospun polycaprolactone (PCL) fiber networks. The open structure of the PCL network and the use of MWCNTs as spacers not only limit the restacking of Ti3C2Tx flakes but also increase the accessible surface of the active materials, facilitating fast diffusion of electrolyte ions within the electrode...
March 29, 2018: Nanoscale
https://www.readbyqxmd.com/read/29517222/controllable-and-reproducible-sheath-of-carbon-fibers-with-single-walled-carbon-nanotubes-through-electrophoretic-deposition-for-in-vivo-electrochemical-measurements
#9
Tongfang Xiao, Yanan Jiang, Wenliang Ji, Lanqun Mao
The unique electronic and chemical structures of carbon nanotubes (CNTs) have well enabled their applications in electrochemistry and electroanalytical chemistry; however, the difficulty in reproducibly confining CNTs onto substrate electrodes, particularly onto microelectrodes, still remains to be addressed. In this study, we develop a method to reproducibly confine single-walled carbon nanotubes (SWNTs) onto carbon fiber microelectrodes (CFEs) with electrophoretic deposition (EPD) for in vivo measurement of ascorbate...
April 3, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29460219/allen-j-bard-and-cynthia-zoski-eds-electroanalytical-chemistry-a-series-of-advances-vol-27
#10
Paolo Ugo
No abstract text is available yet for this article.
May 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29446924/advances-in-electroanalytical-chemistry
#11
EDITORIAL
Shelley D Minteer
No abstract text is available yet for this article.
February 28, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29214533/scanning-electrochemical-microscopy-an-analytical-perspective
#12
REVIEW
Javier Izquierdo, Peter Knittel, Christine Kranz
Scanning electrochemical microscopy (SECM) has evolved from an electrochemical specialist tool to a broadly used electroanalytical surface technique, which has experienced exciting developments for nanoscale electrochemical studies in recent years. Several companies now offer commercial instruments, and SECM has been used in a broad range of applications. SECM research is frequently interdisciplinary, bridging areas ranging from electrochemistry, nanotechnology, and materials science to biomedical research...
January 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29125547/salt-assisted-ultrasonicated-de-aggregation-and-advanced-redox-electrochemistry-of-detonation-nanodiamond
#13
Sanju Gupta, Brendan Evans, Alex Henson, Sara B Carrizosa
Nanodiamond particles form agglomerates in the dry powder state and this poses limitation to the accessibility of their diamond-like core thus dramatically impacting their technological advancement. In this work, we report de-agglomeration of nanodiamond (ND) by using a facile technique namely, salt-assisted ultrasonic de-agglomeration (SAUD). Utilizing ultrasound energy and ionic salts (sodium chloride and sodium acetate), SAUD is expected to break apart thermally treated nanodiamond aggregates (~50-100 nm) and produce an aqueous slurry of de-aggregated stable colloidal nanodiamond dispersions by virtue of ionic interactions and electrostatic stabilization...
November 10, 2017: Materials
https://www.readbyqxmd.com/read/29124941/graphdiyne-as-electrode-material-tuning-electronic-state-and-surface-chemistry-for-improved-electrode-reactivity
#14
Shuyue Guo, Hailong Yan, Fei Wu, Lijun Zhao, Ping Yu, Huibiao Liu, Yuliang Li, Lanqun Mao
Graphdiyne (GDY) is recently synthesized two-dimensional carbon allotrope with hexagonal rings cross-linked by diacetylene through introducing butadiyne linkages (-C≡C-C≡C-) to form 18-C hexagons and is emerging to be fundamentally interesting and particularly useful in various research fields. In this study, we for the first time find that GDY can be used as an electrode material with reactivity tunable by electronic states and surface chemistry of GDY. To demonstrate this, GDY is oxidized into graphdiyne oxide (GDYO) that is then chemically and electrochemically reduced into chemically reduced GDYO (cr-GDYO) and electrochemically reduced GDYO (er-GDYO), respectively...
December 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28621134/surfactant-and-binder-free-hierarchical-platinum-nanoarrays-directly-grown-onto-a-carbon-felt-electrode-for-efficient-electrocatalysis
#15
Widya Ernayati Kosimaningrum, Thi Xuan Huong Le, Yaovi Holade, Mikhael Bechelany, Sophie Tingry, Buchari Buchari, Indra Noviandri, Christophe Innocent, Marc Cretin
The future of fuel cells that convert chemical energy to electricity relies mostly on the efficiency of oxygen reduction reaction (ORR) due to its sluggish kinetics. By effectively bypassing the use of organic surfactants, the postsynthesis steps for immobilization onto electrodes, catalytic ink preparation using binders, and the common problem of nanoparticles (NPs) detachment from the supports involved in traditional methodologies, we demonstrate a versatile electrodeposition method for growing anisotropic microstructures directly onto a three-dimensional (3D) carbon felt electrode, using platinum NPs as the elementary building blocks...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28507703/advanced-electroanalytical-chemistry-at-nanoelectrodes
#16
Yi-Lun Ying, Zhifeng Ding, Dongping Zhan, Yi-Tao Long
Nanoelectrodes, with dimensions below 100 nm, have the advantages of high sensitivity and high spatial resolution. These electrodes have attracted increasing attention in various fields such as single cell analysis, single-molecule detection, single particle characterization and high-resolution imaging. The rapid growth of novel nanoelectrodes and nanoelectrochemical methods brings enormous new opportunities in the field. In this perspective, we discuss the challenges, advances, and opportunities for nanoelectrode fabrication, real-time characterizations and high-performance electrochemical instrumentation...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/27510555/recent-advances-in-the-development-and-application-of-nanoelectrodes
#17
REVIEW
Yunshan Fan, Chu Han, Bo Zhang
Nanoelectrodes have key advantages compared to electrodes of conventional size and are the tool of choice for numerous applications in both fundamental electrochemistry research and bioelectrochemical analysis. This Minireview summarizes recent advances in the development, characterization, and use of nanoelectrodes in nanoscale electroanalytical chemistry. Methods of nanoelectrode preparation include laser-pulled glass-sealed metal nanoelectrodes, mass-produced nanoelectrodes, carbon nanotube based and carbon-filled nanopipettes, and tunneling nanoelectrodes...
October 7, 2016: Analyst
https://www.readbyqxmd.com/read/27490543/electrochemical-determination-of-food-preservative-nitrite-with-gold-nanoparticles-p-aminothiophenol-modified-gold-electrode
#18
Ayşem Üzer, Şener Sağlam, Ziya Can, Erol Erçağ, Reşat Apak
Due to the negative impact of nitrate and nitrite on human health, their presence exceeding acceptable levels is not desired in foodstuffs. Thus, nitrite determination at low concentrations is a major challenge in electroanalytical chemistry, which can be achieved by fast, cheap, and safe electrochemical sensors. In this work, the working electrode (Au) was functionalized with p-aminothiophenol (p-ATP) and modified with gold nanoparticles (Au-NPs) to manufacture the final (Au/p-ATP-Aunano) electrode in a two-step procedure...
August 2, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27455338/exploiting-chemistry-to-improve-performance-of-screen-printed-bismuth-film-electrodes-sp-bife
#19
Carlo Dossi, Damiano Monticelli, Andrea Pozzi, Sandro Recchia
Mercury substitution is a big issue in electroanalysis, and the search for a suitable, and less toxic, replacement is still under development. Of all the proposed alternatives, bismuth films appear to be the most viable solution, although they are still suffering some drawbacks, particularly the influence of deposition conditions and linearity at low concentrations. In this paper, the most promising strategies for bismuth film deposition on screen-printed electrodes (surface modifications, polymeric film deposition, insoluble salt precursors) will be evaluated for trace metal analysis...
July 22, 2016: Biosensors
https://www.readbyqxmd.com/read/27441547/unmasking-the-effects-of-l-dopa-on-rapid-dopamine-signaling-with-an-improved-approach-for-nafion-coating-carbon-fiber-microelectrodes
#20
Lingjiao Qi, Elina Thomas, Stephanie H White, Samantha K Smith, Christie A Lee, Leslie R Wilson, Leslie A Sombers
L-DOPA has been the gold standard for symptomatic treatment of Parkinson's disease. However, its efficacy wanes over time as motor complications develop. Very little is known about how L-DOPA therapy affects the dynamics of fluctuating dopamine concentrations in the striatum on a rapid time scale (seconds). Electrochemical studies investigating the effects of L-DOPA treatment on electrically evoked dopamine release have reported conflicting results with significant variability. We hypothesize that the uncertainty in the electrochemical data is largely due to electrode fouling caused by polymerization of L-DOPA and endogenous catecholamines on the electrode surface...
August 16, 2016: Analytical Chemistry
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