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https://www.readbyqxmd.com/read/28644008/influence-of-tip-and-substrate-properties-and-nonsteady-state-effects-on-nanogap-kinetic-measurements-response-to-comment-on-impact-of-adsorption-on-scanning-electrochemical-microscopy-voltammetry-and-implications-for-nanogap-measurements
#1
https://www.readbyqxmd.com/read/28641436/doping-as-a-means-to-probe-the-potential-dependence-of-dopamine-adsorption-on-carbon-based-surfaces-a-first-principles-study
#2
Anja Aarva, Tomi Laurila, Miguel A Caro
In this work, we study the adsorption characteristics of dopamine (DA), ascorbic acid (AA), and dopaminequinone (DAox) on carbonaceous electrodes. Our goal is to obtain a better understanding of the adsorption behavior of these analytes in order to promote the development of new carbon-based electrode materials for sensitive and selective detection of dopamine in vivo. Here we employ density functional theory-based simulations to reach a level of detail that cannot be achieved experimentally. To get a broader understanding of carbonaceous surfaces with different morphological characteristics, we compare three materials: graphene, diamond, and amorphous carbon (a-C)...
June 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28639347/high-energy-power-and-low-temperature-cathode-for-sodium-ion-batteries-in-situ-xrd-study-and-superior-full-cell-performance
#3
Jin-Zhi Guo, Peng-Fei Wang, Xing-Long Wu, Xiao-Hua Zhang, Qingyu Yan, Hong Chen, Jing-Ping Zhang, Yu-Guo Guo
Sodium-ion batteries (SIBs) are still confronted with several major challenges, including low energy and power densities, short-term cycle life, and poor low-temperature performance, which severely hinder their practical applications. Here, a high-voltage cathode composed of Na3 V2 (PO4 )2 O2 F nano-tetraprisms (NVPF-NTP) is proposed to enhance the energy density of SIBs. The prepared NVPF-NTP exhibits two high working plateaux at about 4.01 and 3.60 V versus the Na(+) /Na with a specific capacity of 127.8 mA h g(-1) ...
June 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28639213/study-on-photophysical-properties-of-n-arylphthalamic-acid-derivative-containing-1-2-4-triazole-scaffold
#4
K B Akshaya, Anitha Varghese, Y N Sudhakar, Prajwal Lourdes Lobo, Louis George
A novel N-arylphthalamic acid derivative, 2-({4-[(1H-1,2,4-triazol-1-yl)methyl]phenyl}carbamoyl)benzoic acid (TMPCB) was synthesized and their absorption and emission spectra were recorded in fifteen different solvents of varying polarities at room temperature. Ground state dipole moment of the derivative was calculated experimentally by Guggenheim method and solvatochromic approach proposed by Bilot-Kawski. The singlet excited state dipole moment of TMPCB were calculated experimentally based on different approaches of solvent polarity function proposed by Lippert-Mataga, Bakhshiev, Kawskii-Chamma-Viallet, Reichardt and Bilot-Kawski...
June 21, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28638772/tin-bismuth-and-tin-bismuth-alloy-electrodeposition-from-chlorometalate-salts-in-deep-eutectic-solvents
#5
Luciana Vieira, Jennifer Burt, Peter W Richardson, Daniel Schloffer, David Fuchs, Alwin Moser, Philip N Bartlett, Gillian Reid, Bernhard Gollas
The electrodeposition of tin, bismuth, and tin-bismuth alloys from Sn(II) and Bi(III) chlorometalate salts in the choline chloride/ethylene glycol (1:2 molar ratio) deep eutectic solvent was studied on glassy carbon and gold by cyclic voltammetry, rotating disc voltammetry, and chronoamperometry. The Sn(II)-containing electrolyte showed one voltammetric redox process corresponding to Sn(II)/Sn(0). The diffusion coefficient of [SnCl3](-), detected as the dominating species by Raman spectroscopy, was determined from Levich and Cottrell analyses...
June 2017: ChemistryOpen
https://www.readbyqxmd.com/read/28636826/degradation-mechanisms-of-magnesium-metal-anodes-in-electrolytes-based-on-cf3so2-2n-at-high-current-densities
#6
Hyun Deog Yoo, Sang-Don Han, Igor L Bolotin, Gene M Nolis, Ryan D Bayliss, Anthony K Burrell, John T Vaughey, Jordi Cabana
The energy density of rechargeable batteries utilizing metals as anodes surpasses Li-ion batteries, which employ carbon instead. Among possible metals, magnesium represents a potential alternative to the conventional choice, lithium, in terms of storage density, safety, stability, and cost. However, a major obstacle for metal-based batteries is the identification of electrolytes that show reversible deposition/dissolution of the metal anode and support reversible intercalation of ions into a cathode. Traditional Grignard-based Mg electrolytes are excellent toward reversible deposition of Mg, but their limited anodic stability and compatibility with oxide cathodes hinder their applicability in Mg batteries with higher voltage...
June 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28635267/cytochrome-c-provides-an-electron-funneling-antenna-for-efficient-photocurrent-generation-in-a-reaction-center-biophotocathode
#7
Vincent Morris Friebe, Diego Millo, David Swainsbury, Michael R Jones, Raoul N Frese
The high quantum efficiency of photosynthetic reaction centers make them attractive for bioelectronic and biophoto-voltaic applications. However, much of the native reaction center efficiency is lost in communication between surface bound reaction centers and electrode materials. State of the art biophotoelectrodes utilizing cytochrome c (cyt c) as a biological wiring agent have at best approached 32% retained RC quantum efficiency. However, bottlenecks in cyt c -mediated electron transfer have not been fully elucidated...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28629098/carbon-nanotube-ensembled-hybrid-nanocomposite-electrode-for-direct-electrochemical-detection-of-epinephrine-in-pharmaceutical-tablets-and-urine
#8
K Koteshwara Reddy, M Satyanarayana, K Yugender Goud, K Vengatajalabathy Gobi, Hern Kim
An efficient electrochemical sensor for selective detection of the neurotransmitter, epinephrine (Epn), has been fabricated with the aid of a functionalized multiwall carbon nanotube-chitosan biopolymer nanocomposite (Chit-fCNT) electrode. Multiwall carbon nanotubes (CNT) were successfully functionalized with the aid of nitric acid and confirmed by the Raman spectral data. Functionalized carbon nanotubes (fCNT) were dispersed in chitosan solution and the resulting bio-nanocomposite was used for the fabrication of sensor surface by drop and cast method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629040/3-aminopropyltrimethoxysilane-mediated-solvent-induced-synthesis-of-gold-nanoparticles-for-biomedical-applications
#9
Prem C Pandey, Gunjan Pandey, Alain Walcarius
The effect of acetone on 3-aminopropyltrimethoxysilane (3-APTMS) mediated synthesis of gold nanoparticles (AuNPs) in polar protic, polar aprotic and non polar solvents specifically water, acetone and chloroform has been studied. The findings revealed that acetone promotes the formation of siloxane polymer in chloroform and acetone solvents, but not in water, while AuNPs are formed in all cases. The bifunctional nature of 3-APTMS [NH2(CH2)3Si(OMe)3] controls the formation of siloxane polymer through hydrolysis and condensation of trimethoxysilyl group whereas the amine moieties are likely to form imine linkage, which are involved in the synthesis of gold nanoparticles...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629017/design-of-a-new-nanocomposite-between-bismuth-nanoparticles-and-graphene-oxide-for-development-of-electrochemical-sensors
#10
Eduardo H Bindewald, Arthur F Schibelbain, Maurício A P Papi, Eduardo G C Neiva, Aldo J G Zarbin, Márcio F Bergamini, Luiz H Marcolino-Júnior
This study describes a new route for preparation of a nanocomposite between graphene oxide (GO) and bismuth nanoparticles (BiNPs) and its evaluation as modifier electrode for development of electrochemical sensors. BiNPs were synthesized under ultrasound conditions using Bi(NO3)3 as metal precursor and ascorbic acid (AA) as reducing agent/passivating. Some experimental parameters of BiNPs synthesis such as Bi(3+):AA molar ratio and reaction time were conducted aiming the best voltammetric performance of the sensor...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628605/corrigendum-reevaluation-of-performance-of-electric-double-layer-capacitors-from-constant-current-charge-discharge-and-cyclic-voltammetry
#11
Anis Allagui, Todd J Freeborn, Ahmed S Elwakil, Brent J Maundy
This corrects the article DOI: 10.1038/srep38568.
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28627257/toward-the-development-of-a-glucose-dehydrogenase-based-saliva-glucose-sensor-without-the-need-for-sample-preparation
#12
Chi Lin, Breanna Pratt, Mackenzie Honikel, Alaina Jenish, Bhavna Ramesh, Amnah Alkhan, Jeffrey T La Belle
BACKGROUND: Strict glycemic control is known to be a vital key in the management of diabetes mellitus (DM). However, traditional methods face limitations in their efficacy due to the pain and invasiveness of needle pricking which often discourages DM patients from performing the required number of tests per day. Saliva glucose (SG) sensing has long been considered a noninvasive alternative to blood glucose monitoring for diabetes management, however the sample preparation and sensor detection limit have been deemed as challenges to overcome...
June 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28627139/direct-electro-oxidation-of-dimethyl-ether-on-pt-cu-nanochains
#13
Bar Gavriel, Ronit Sharabi, Lior Elbaz
In this work, new catalyst for the direct electro-oxidation of dimethyl ether (DME) was synthesized and studied using an array of techniques. One of the most prominent catalysts for this reaction, platinum copper alloy (PtCu), was synthesized in an easy and low cost approach. Structural characterizations such as X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and elemental analysis revealed that the synthesized PtCu nanoparticles (3 nm on average), formed homogeneous NanoChains without aggregation of metallic platinum or copper...
June 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28624996/exploring-the-bioelectrochemical-characteristics-of-activated-sludge-using-cyclic-voltammetry
#14
Dena Z Khater, K M El-Khatib, Rabeay Y A Hassan
Due to the potential interest, bioelectrochemical responses of activated sludge using the three-electrode system are tested. From the cyclic voltammograms, the oxidation current output is increasing due to incubation time increase, whereas 5, 25 and 39.33 μA are obtained after 3, 72 and 96 h, respectively. Changing the working electrode from glassy carbon to carbon paste led to the increase in the electrochemical signal from 0.3 to be 3.72 μA. On the other hand, the use of the lipophilic redox mediator (2,6-dichlorophenolindophenol (DCIP)) amplified the oxidation current to reach 19...
June 17, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28624745/silver-chloride-enwrapped-silver-grafted-on-nitrogen-doped-reduced-graphene-oxide-as-a-highly-efficient-visible-light-driven-photocatalyst
#15
Liang Wang, Yilun Shi, Tianfu Wang, Lili Zhang
The visible-light-driven plasmonic photocatalyst silver chloride enwrapped silver/nitrogen-doped reduced graphene oxide (AgCl@Ag/N-rGO) was prepared by a facile hydrothermal-in situ oxidation method and characterized by Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The characterization results reveal that Ag nanoparticles (NPs) were first grafted on N-rGO via N-groups as anchor sites and then enwrapped by AgCl by in situ oxidation...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28623278/highly-conductive-nano-sized-magn%C3%A3-li-phases-titanium-oxide-tiox
#16
Aditya F Arif, Ratna Balgis, Takashi Ogi, Ferry Iskandar, Akihiro Kinoshita, Keitaro Nakamura, Kikuo Okuyama
Despite the strong recent revival of Magnéli phase TiOx as a promising conductive material, synthesis of Magnéli phase TiOx nanoparticles has been a challenge because of the heavy sintering nature of TiO2 at elevated temperatures. We have successfully synthesized chain-structured Magnéli phases TiOx with diameters under 30 nm using a thermal-induced plasma process. The synthesized nanoparticles consisted of a mixture of several Magnéli phases. A post-synthesis heat-treatment was performed to reduce the electrical resistivity without changing the particle morphology...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28622726/efficient-covalent-modification-of-multiwalled-carbon-nanotubes-with-diazotized-dyes-in-water-at-room-temperature
#17
Asma Bensghaïer, Stephanie Lau-Truong, Mahamadou Seydou, Aazdine Lamouri, Eric Leroy, Matej Micusik, Klaudia Forro, Mohamed Beji, Jean Pinson, Maria Omastova, Mohamed Mehdi Chehimi
Tetrafluoroborate salts of diazotized Azure A (AA-N2+), Neutral Red (NR-N2+) and Congo Red (CR-N2+) dyes were prepared and reacted with multiwalled carbon nanotubes (MWCNTs) at room temperature, in water without any reducing agent. The as-modified MWCNTs were examined by IRATR, Raman spectroscopy, XPS, TGA, TEM and cyclic voltammetry. The diazonium band located at 2350 cm-1 in the diazotized dye IR spectra vanished after attachment to the nanotubes whilst Raman D/G peak ratio slightly increased after dye covalent attachment at high initial diazonium/CNT mass ratio...
June 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28622717/synthesis-and-electrochemical-properties-of-lini0-5mn1-5o4-cathode-materials-with-cr-3-and-f-composite-doping-for-lithium-ion-batteries
#18
Jun Li, Shaofang Li, Shuaijun Xu, Si Huang, Jianxin Zhu
A Cr(3+) and F(-) composite-doped LiNi0.5Mn1.5O4 cathode material was synthesized by the solid-state method, and the influence of the doping amount on the material's physical and electrochemical properties was investigated. The structure and morphology of the cathode material were characterized by XRD, SEM, TEM, and HRTEM, and the results revealed that the sample exhibited clear spinel features. No Cr(3+) and F(-) impurity phases were found, and the spinel structure became more stable. The results of the charge/discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) test results suggested that LiCr0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28622555/very-sensitive-electrochemical-determination-of-diuron-on-glassy-carbon-electrode-modified-with-reduced-graphene-oxide-gold-nanoparticle-nafion-composite-film
#19
K Zarei, A Khodadadi
In this work, a very sensitive electrochemical sensor based on glassy carbon electrode (GCE) modified with reduced graphene oxide-gold nanoparticles/Nafion (rGO-AuNPs/Nafion) composite film was applied to determine diuron. Synthesized GO was characterized using X-ray diffraction (XRD) and UV-visible spectroscopy. The surface morphology of the rGO-AuNPs/Nafion film was also characterized using scanning electron microscopy and electrochemical impedance spectroscopy. Cyclic voltammetry (CV) and adsorptive differential pulse voltammetry (AdDPV) were applied to investigate the electrochemical response of the diuron on the modified electrode...
June 13, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28621779/the-effective-determination-of-cd-ii-and-pb-ii-simultaneously-based-on-an-aluminum-silicon-carbide-reduced-graphene-oxide-nanocomposite-electrode
#20
Yale Wu, Tao Yang, Kuo-Chih Chou, Junhong Chen, Lei Su, Xinmei Hou
A platform for the simultaneous determination of Cd(ii) and Pb(ii) in aqueous solution has been applied based on an aluminum silicon carbide-reduced graphene oxide nanocomposite (Al4SiC4-RGO) modified bismuth film glassy carbon electrode (GCE) using square wave anodic stripping voltammetry (SWASV) for the first time. The Al4SiC4-RGO nanocomposite electrode was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Compared with the Al4SiC4 modified GCE and bare GCE, the electrochemical performance of the Al4SiC4-RGO nanocomposite electrode is obviously enhanced resulting from the synergistic effects of Al4SiC4, RGO and bismuth film...
June 16, 2017: Analyst
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