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https://www.readbyqxmd.com/read/29786972/a-lyophilized-and-thermal-two-step-synthesis-of-cofe-alloy-nanoparticles-embedded-in-n-doped-carbon-nanosheets-carbon-nanotubes-for-highly-efficient-oxygen-evolution-reaction
#1
Yang Liu, Feng Li, Haidong Yang, Jing Li, Ping Ma, Yan Zhu, Jiantai Ma
There is a vital need to explore highly-efficient and stable nonprecious-metal catalysts for oxygen evolution reaction (OER) to reduce the overpotential and further improve the energy conversion efficiency. Herein, we report a unique and cost-effective lyophilized and thermal two step procedure to synthesize high-performance CoFe alloy nanoparticles embedded in N-doped carbon nanosheets interspersed with carbon nanotubes (CoFe-N-CN/CNTs) hybrid. The lyophilization step during catalysts preparation is beneficial to uniform the dispersion of carbon-like precursors and avoid the agglomeration of metal particles...
May 22, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29786661/suspended-carbon-nanotubes-for-humidity-sensing
#2
Shivaram Arunachalam, Anubha A Gupta, Ricardo Izquierdo, Frederic Nabki
A room temperature microfabrication technique using SU8, an epoxy-based highly functional photoresist as a sacrificial layer, is developed to obtain suspended aligned carbon nanotube beams. The humidity-sensing characteristics of aligned suspended single-walled carbon nanotube films are studied. A comparative study between suspended and non-suspended architectures is done by recording the resistance change in the nanotubes under humidity. For the tests, the humidity was varied from 15% to 98% RH. A comparative study between suspended and non-suspended devices shows that the response and recovery times of the suspended devices was found to be almost 3 times shorter than the non-suspended devices...
May 22, 2018: Sensors
https://www.readbyqxmd.com/read/29786444/exploring-the-confinement-effect-of-carbon-nanotubes-on-the-electrochemical-properties-of-prussian-blue-nanoparticles
#3
Ti-Wei Chen, Zhong-Qiu Li, Kang Wang, Feng-Bin Wang, Xing-Hua Xia
A novel and efficient photochemical method has been proposed for the encapsulation of Prussian blue nanoparticles (PBNPs) inside the channels of carbon nanotubes (PB-in-CNTs) in an acidic ferrocyanide solution under UV/Vis illumination and the confinement effect of CNTs on the electrochemical properties of PBNPs is systematically explored. PB-in-CNTs shows a faster electron transfer process, an enhanced electrocatalytic activity toward the reduction of H2O2 and an increased anti-base ability compared to PBNPs loaded outside of CNTs (PB-out-CNTs)...
May 22, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29785854/high-k-gate-dielectrics-for-emerging-flexible-and-stretchable-electronics
#4
Binghao Wang, Wei Huang, Lifeng Chi, Mohammed Al-Hashimi, Tobin J Marks, Antonio Facchetti
Recent advances in flexible and stretchable electronics (FSE), a technology diverging from the conventional rigid silicon technology, have stimulated fundamental scientific and technological research efforts. FSE aims at enabling disruptive applications such as flexible displays, wearable sensors, printed RFID tags on packaging, electronics on skin/organs, and Internet-of-things as well as possibly reducing the cost of electronic device fabrication. Thus, the key materials components of electronics, the semiconductor, the dielectric, and the conductor as well as the passive (substrate, planarization, passivation, and encapsulation layers) must exhibit electrical performance and mechanical properties compatible with FSE components and products...
May 22, 2018: Chemical Reviews
https://www.readbyqxmd.com/read/29785031/nanoparticle-templated-nanofiltration-membranes-for-ultrahigh-performance-desalination
#5
Zhenyi Wang, Zhangxin Wang, Shihong Lin, Huile Jin, Shoujian Gao, Yuzhang Zhu, Jian Jin
Nanofiltration (NF) membranes with ultrahigh permeance and high rejection are highly beneficial for efficient desalination and wastewater treatment. Improving water permeance while maintaining the high rejection of state-of-the-art thin film composite (TFC) NF membranes remains a great challenge. Herein, we report the fabrication of a TFC NF membrane with a crumpled polyamide (PA) layer via interfacial polymerization on a single-walled carbon nanotubes/polyether sulfone composite support loaded with nanoparticles as a sacrificial templating material, using metal-organic framework nanoparticles (ZIF-8) as an example...
May 21, 2018: Nature Communications
https://www.readbyqxmd.com/read/29784361/calcium-selective-electrodes-based-on-photo-cured-polyurethane-acrylate-membranes-covalently-attached-to-methacrylate-functionalized-poly-3-4-ethylenedioxythiophene-as-solid-contact
#6
Cristina Ocaña, Natalia Abramova, Andrey Bratov, Tom Lindfors, Johan Bobacka
We report here the fabrication of solid-contact calcium-selective electrodes (Ca2+ -SCISEs) made of a polyurethane acrylate ion-selective membrane (ISM) that was covalently attached to the underlying ion-to-electron transducer (solid-contact). Methacrylate-functionalized poly(3,4-ethylenedioxythiophene) (Meth-PEDOT) and Meth-PEDOT films containing either multiwalled carbon nanotubes (MWCNT) or carboxylated MWCNT (cMWCNT) were used as solid contacts. The solid contacts were deposited by drop-casting on screen-printed electrodes and characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and potentiometry...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784357/a-sensitively-non-enzymatic-amperometric-sensor-and-its-application-in-living-cell-superoxide-anion-radical-detection
#7
Xinhe Liu, Miaomiao Ran, Guoan Liu, Xiuhui Liu, Zhonghua Xue, Xiaoquan Lu
Here, we report a nanocomposite composed of silver nanoparticles and multi-walled carbon nanotubes (AgNPs/MWNTs) utilized as an efficient electrode material for sensitive detection superoxide anion (O2 •- ). The procedure to synthesize AgNPs/MWNTs nanocomposites was green and facile. In the presence of functionalized multi-wall carbon nanotubes (MWNTs), silver nanoparticles (AgNPs) were in situ generated by chemical reduction of silver nitrate with glucose as a reducing and stabilizing agent to give the desired AgNPs/MWNTs nanocomposites...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783838/direct-proof-of-a-defect-modulated-gap-transition-in-semiconducting-nanotubes
#8
Ryosuke Senga, Thomas Pichler, Yohei Yomogida, Takeshi Tanaka, Hiromichi Kataura, Kazutomo Suenaga
Measurements of optical properties at a nanometer level are of central importance for the characterization of optoelectronic devices. It is, however, difficult for conventional light-probe measurements to determine the local optical properties from a single quantum object with nanometrical inhomogeneity. Here, we successfully measured the optical gap transitions of an individual semiconducting carbon nanotube with defects by using a monochromated electron source as a probe. The optical conductivity extracted from an electron energy-loss spectrum for a certain type of defect presents a characteristic modification near the lowest excitation peak (E11) where excitons and nonradiative transitions, as well as phonon-coupled excitations, are strongly involved...
May 22, 2018: Nano Letters
https://www.readbyqxmd.com/read/29783082/multiplexed-aptasensor-based-on-metal-ions-labels-for-simultaneous-detection-of-multiple-antibiotic-residues-in-milk
#9
Falan Li, Yemin Guo, Xiangyou Wang, Xia Sun
A dual-target electrochemical aptasensor was developed for the simultaneous detection of multiple antibiotics based on metal ions as signal tracers and nanocomposites as signal amplification strategy. Metal ions such as Cd2+ and Pb2+ could generate distinct differential pulse voltammetry (DPV) peaks. When targets were present, kanamycin (KAN) and streptomycin (STR) as models, the KAN aptamer (KAP) and STR aptamer (STP) were released from their complementary strands, with more change of Cd2+ and Pb2+ corresponding to peak currents...
April 13, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29782797/low-temperature-synthesized-h-2-ti-3-o-7-nanotubes-with-a-high-co-2-adsorption-property-by-amine-modification
#10
Misaki Ota, Yuichiro Hirota, Yoshiaki Uchida, Yasuhiro Sakamoto, Norikazu Nishiyama
Carbon dioxide (CO2 ) capture and storage (CCS) technologies have been attracted attention in terms of tackling with global warming. To date, various CO2 capture technologies including solvents, membranes, cryogenics and solid adsorbents have been proposed. Currently, a liquid adsorption method for CO2 using amine solution (monoethanolamine) has been practically used. However, this liquid phase CO2 adsorption process requires heat regeneration, and it can cause many problems such as corrosion of equipment and degradation of the solution...
May 21, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29782702/unique-tube-ring-interactions-complexation-of-single-walled-carbon-nanotubes-with-cycloparaphenyleneacetylenes
#11
Koji Miki, Kenzo Saiki, Tomokazu Umeyama, Jinseok Baek, Takeru Noda, Hiroshi Imahori, Yuta Sato, Kazu Suenaga, Kouichi Ohe
Carbon nanotubes (CNTs) interlocked by cyclic compounds through supramolecular interaction are promising rotaxane-like materials applicable as 2D and 3D networks of nanowires and disease-specific theranostic agents having multifunctionalities. Supramolecular complexation of CNTs with cyclic compounds in a "ring toss'' manner is a straightforward method to prepare interlocked CNTs; however, to date, this has not been reported on. Here, the "ring toss" method to prepare interlocked CNTs by using π-conjugated carbon nanorings: [8]-, [9]-, and [10]cycloparaphenyleneacetylene (CPPA) is reported...
May 21, 2018: Small
https://www.readbyqxmd.com/read/29782683/nife-oxy-hydroxides-derived-from-nife-disulfides-as-an-efficient-oxygen-evolution-catalyst-for-rechargeable-zn-air-batteries-the-effect-of-surface-s-residues
#12
Tanyuan Wang, Gyutae Nam, Yue Jin, Xingyu Wang, Pengju Ren, Min Gyu Kim, Jiashun Liang, Xiaodong Wen, Haeseong Jang, Jiantao Han, Yunhui Huang, Qing Li, Jaephil Cho
A facile H2 O2 oxidation treatment to tune the properties of metal disulfides for oxygen evolution reaction (OER) activity enhancement is introduced. With this method, the degree of oxidation can be readily controlled and the effect of surface S residues in the resulted metal (oxy)hydroxides for the OER is revealed for the first time. The developed NiFe (oxy)hydroxide catalyst with residual S demonstrates an extraordinarily low OER overpotential of 190 mV at the current density of 10 mA cm-2 after coupling with carbon nanotubes, and outstanding performance in Zn-air battery tests...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29782147/electronic-structure-control-of-sub-nanometer-1d-snte-via-nanostructuring-within-single-walled-carbon-nanotubes
#13
Andrij Vasylenko, Samuel Marks, Jamie M Wynn, Paulo V C Medeiros, Quentin M Ramasse, Andrew J Morris, Jeremy Sloan, David Quigley
Nanostructuring, e.g. reduction of dimensionality in materials offers a viable route towards regulation of materials electronic and hence functional properties. Here, we present the extreme case of nanostructuring, exploiting capillarity of single-walled carbon nanotubes (SWCNTs) for synthesis of the smallest possible SnTe nanowires with cross sections as small as a single atom column. We demonstrate that by choosing the appropriate diameter of a template SWCNT, we can manipulate the structure of the quasi-one-dimensional (1D) SnTe and to design electronic behaviour...
May 21, 2018: ACS Nano
https://www.readbyqxmd.com/read/29781621/enhanced-single-photon-emission-from-carbon-nanotube-dopant-states-coupled-to-silicon-microcavities
#14
Akihiro Ishii, Xiaowei He, Nicolai F Hartmann, Hidenori Machiya, Han Htoon, Stephen K Doorn, Yuichiro K Kato
Single-walled carbon nanotubes are a promising material as quantum light sources at room temperature and as nanoscale light sources for integrated photonic circuits on silicon. Here we show that integration of dopant states in carbon nanotubes and silicon microcavities can provide bright and high-purity single photon emitters on silicon photonics platform at room temperature. We perform photoluminescence spectroscopy and observe enhancement of emission from the dopant states by a factor of ∼50, and cavity-enhanced radiative decay is confirmed using time-resolved measurements, where ∼30% decrease of emission lifetime is observed...
May 21, 2018: Nano Letters
https://www.readbyqxmd.com/read/29780548/reversible-dispersion-and-release-of-carbon-nanotubes-via-cooperative-clamping-interactions-with-hydrogen-bonded-nanorings
#15
Raquel Chamorro, Leire de Juan-Fernández, Belén Nieto-Ortega, Maria J Mayoral, Santiago Casado, Luisa Ruiz-González, Emilio M Pérez, David González-Rodríguez
Due to their outstanding electronic and mechanical properties, single-walled carbon nanotubes (SWCNTs) are promising nanomaterials for the future generation of optoelectronic devices and composites. However, their scarce solubility limits their application in many technologies that demand solution-processing of high-purity SWCNT samples. Although some non-covalent functionalization approaches have demonstrated their utility in extracting SWCNTs into different media, many of them produce short-lived dispersions or ultimately suffer from contamination by the dispersing agent...
May 7, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780433/influence-of-metal-deposition-and-activation-method-on-the-structure-and-performance-of-carbon-nanotube-supported-palladium-catalysts
#16
Wouter S Lamme, Jovana Zečević, Krijn P de Jong
The effects of the metal deposition and activation methods on metal particle size and distribution were investigated for carbon nanotube supported Pd catalysts. The Pd precursor was loaded by incipient wetness impregnation, ion adsorption, and deposition precipitation and was activated by thermal treatment under a nitrogen atmosphere or in the liquid phase by reduction by formaldehyde or sodium borohydride. Regardless of the metal precursor loading method, activation under a N2 atmosphere at 500 °C led to homogeneously distributed 4 nm Pd particles...
April 9, 2018: ChemCatChem
https://www.readbyqxmd.com/read/29780275/synthesis-characterization-and-interactions-of-single-walled-carbon-nanotubes-modified-with-doxorubicin-with-langmuir-blodgett-biomimetic-membranes
#17
Dorota Matyszewska, Ewelina Napora, Kamila Żelechowska, Jan F Biernat, Renata Bilewicz
The synthesis, characterization, and the influence of single-walled carbon nanotubes (SWCNTs) modified with an anticancer drug doxorubicin (DOx) on the properties of model biological membrane as well as the comparison of the two modes of modification has been presented. The drug was covalently attached to the nanotubes either preferentially on the sides or at the ends of the nanotubes by the formation of hydrazone bond. The efficiency of the modification was proved by the results of FTIR, Raman, and thermogravimetric analysis...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29779368/automated-3d-printed-microfluidic-array-for-rapid-nanomaterial-enhanced-detection-of-multiple-proteins
#18
Karteek Kadimisetty, Spundana Malla, Ketki Bhalerao, Islam M Mosa, Snehasis Bhakta, Norman Lee, James F Rusling
We report here the fabrication and validation of a novel 3D printed, automated immunoarray to detect multiple proteins with ultralow detection limits. This low cost, miniature immunoarray employs electrochemiluminescent (ECL) detection measured with a CCD camera and employs touch screen control of a micropump to facilitate automated use. The miniaturized array features prefilled reservoirs to deliver sample and reagents to a paper-thin pyrolytic graphite microwell detection chip to complete sandwich immunoassays...
May 21, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29778055/new-insights-into-the-effects-of-support-matrix-on-the-removal-of-organic-micro-pollutants-and-the-microbial-community-in-constructed-wetlands
#19
Liang Zhang, Tao Lyu, Carlos Andrés Ramírez Vargas, Carlos A Arias, Pedro N Carvalho, Hans Brix
Constructed wetlands (CWs) are an eco-friendly and cost-effective technology to remove organic micro-pollutants (OMPs) from wastewater. The support matrix is an important component in CWs as it has a primary role in the growth and development of plants and microbes. However, the roles of the support matrix in CWs in removing OMPs have not been systematically studied. Therefore, in this study, six common materials (sand, zeolite, blast iron slag, petcoke, polonite and crushed autoclaved aerated concrete (CAAC)) as support matrixes were firstly investigated by batch tests to explore their adsorption capacities to selected OMPs (ibuprofen, iohexol, tebuconazole and imazalil)...
May 16, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29778037/efficient-electrochemical-degradation-of-multiwall-carbon-nanotubes
#20
Vytas Reipa, Shannon K Hanna, Aaron Urbas, Lane Sander, John Elliott, Joseph Conny, Elijah J Petersen
As the production mass of multiwall carbon nanotubes (MWCNT) increases, the potential for human and environmental exposure to MWCNTs may also increase. We have shown that exposing an aqueous suspension of pristine MWCNTs to an intense oxidative treatment in an electrochemical reactor, equipped with an efficient hydroxyl radical generating Boron Doped Diamond (BDD) anode, leads to their almost complete mineralization. Thermal optical transmittance analysis showed a total carbon mass loss of over two orders of magnitude due to the electrochemical treatment, a result consistent with measurements of the degraded MWCNT suspensions using UV-vis absorbance...
April 26, 2018: Journal of Hazardous Materials
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