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Vertically aligned carbon nanotubes

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https://www.readbyqxmd.com/read/29302632/engineered-lys-6-tagged-recombinant-sulfide-reactive-hemoglobin-i-for-covalent-immobilization-at-multiwalled-carbon-nanotubes
#1
Ramonita Díaz-Ayala, Lisa Torres-González, Ruth Pietri, Carlos R Cabrera, Juan López-Garriga
The recombinant HbI was fused with a poly-Lys tag ((Lys)6-tagged rHbI) for specific-site covalent immobilization on two carbon nanotube transducer surfaces, i.e., powder and vertically aligned carbon nanotubes. The immobilization was achieved by following two steps: (1) generation of amine-reactive ester from the carboxylic acid groups of the surfaces and (2) coupling these groups with the amine groups of the Lys-tag. We analyzed the immobilization process using different conditions and techniques to differentiate protein covalent attachment from physical adsorption...
December 31, 2017: ACS Omega
https://www.readbyqxmd.com/read/29232892/new-three-dimensional-porous-electrode-concept-vertically-aligned-carbon-nanotubes-directly-grown-on-embroidered-copper-structures
#2
Noemí Aguiló-Aguayo, Roger Amade, Shahzad Hussain, Enric Bertran, Thomas Bechtold
New three-dimensional (3D) porous electrode concepts are required to overcome limitations in Li-ion batteries in terms of morphology (e.g., shapes, dimensions), mechanical stability (e.g., flexibility, high electroactive mass loadings), and electrochemical performance (e.g., low volumetric energy densities and rate capabilities). Here a new electrode concept is introduced based on the direct growth of vertically-aligned carbon nanotubes (VA-CNTs) on embroidered Cu current collectors. The direct growth of VA-CNTs was achieved by plasma-enhanced chemical vapor deposition (PECVD), and there was no application of any post-treatment or cleaning procedure...
December 11, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29227556/titanium-disulfide-coated-carbon-nanotube-hybrid-electrodes-enable-high-energy-density-symmetric-pseudocapacitors
#3
Xining Zang, Caiwei Shen, Emmeline Kao, Roseanne Warren, Ruopeng Zhang, Kwok Siong Teh, Junwen Zhong, Minsong Wei, Buxuan Li, Yao Chu, Mohan Sanghadasa, Adam Schwartzberg, Liwei Lin
While electrochemical supercapacitors often show high power density and long operation lifetimes, they are plagued by limited energy density. Pseudocapacitive materials, in contrast, operate by fast surface redox reactions and are shown to enhance energy storage of supercapacitors. Furthermore, several reported systems exhibit high capacitance but restricted electrochemical voltage windows, usually no more than 1 V in aqueous electrolytes. Here, it is demonstrated that vertically aligned carbon nanotubes (VACNTs) with uniformly coated, pseudocapacitive titanium disulfide (TiS2 ) composite electrodes can extend the stable working range to over 3 V to achieve a high capacitance of 195 F g-1 in an Li-rich electrolyte...
December 11, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29185493/on-chip-integrated-vertically-aligned-carbon-nanotube-based-super-and-pseudocapacitors
#4
O Pitkänen, T Järvinen, H Cheng, G S Lorite, A Dombovari, L Rieppo, S Talapatra, H M Duong, G Tóth, K L Juhász, Z Kónya, A Kukovecz, P M Ajayan, R Vajtai, K Kordás
On-chip energy storage and management will have transformative impacts in developing advanced electronic platforms with built-in energy needs for operation of integrated circuits driving a microprocessor. Though success in growing stand-alone energy storage elements such as electrochemical capacitors (super and pseusocapacitors) on a variety of substrates is a promising step towards this direction. In this work, on-chip energy storage is demonstrated using architectures of highly aligned vertical carbon nanotubes (CNTs) acting as supercapacitors, capable of providing large device capacitances...
November 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29182175/stable-fe-nanomagnets-encapsulated-inside-vertically-aligned-carbon-nanotubes
#5
Federica Bondino, Elena Magnano, Regina Ciancio, Carla Castellarin Cudia, Alessandro Barla, Elvio Carlino, Flora Yakhou-Harris, Nalin Rupesinghe, Cinzia Cepek
Well-defined sized (5-10 nm) metallic iron nanoparticles (NPs) with body-centered cubic structure encapsulated inside the tip of millimeter-long vertically aligned carbon nanotubes (VACNTs) of uniform length have been investigated with high-resolution transmission electron microscopy and soft X-ray spectroscopy techniques. Surface-sensitive and chemically-selective measurements have been used to evaluate the magnetic properties of the encapsulated NPs. The encapsulated Fe NPs display magnetic remanence up to room temperature, low coercivity, high chemical stability and no significant anisotropy...
November 28, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29147947/biocompatibility-of-vertically-aligned-multi-walled-carbon-nanotube-scaffolds-for-human-breast-cancer-cell-line-mda-mb-231
#6
E M Akinoglu, K Ozbilgin, P Kilicaslan Sonmez, M M Ozkut, M Giersig, S Inan, E Gumustepe, C Kurtman
The aim of the current study was to determine whether the MWCNT-based scaffold has a suitable structure for cell growth and provides a biocompatible environment for human MDA-MB-231 cell lines. MWCNT-based nanostructured scaffolds were produced by plasma-enhanced chemical vapor deposition (PECVD) technique. MDA-MB-231 cells were seeded on MWCNTs-textured silicon scaffolds and on pristine silicon surfaces. After 1 week of culturing, the scaffolds were prepared for SEM analysis and immunocytochemical staining was performed for the two groups (MWCNT scaffold and pristine silicon surface), using MMP-2, MMP-9, PI3K, AKT and NF-κB primary antibodies...
November 16, 2017: Progress in Biomaterials
https://www.readbyqxmd.com/read/29131948/stable-wettability-control-of-nanoporous-microstructures-by-icvd-coating-of-carbon-nanotubes
#7
Hossein Sojoudi, Sanha Kim, Hangbo Zhao, Rama Kishore Annavarapu, Dhanushkodi Mariappan, A John Hart, Gareth H McKinley, Karen K Gleason
Scalable manufacturing of structured materials with engineered nanoporosity is critical for applications in energy storage devices (i.e. batteries and supercapacitors) and wettability control of surfaces (i.e. superhydrophobic and superomniphobic surfaces). Patterns formed in arrays of vertically aligned carbon nanotubes (VA-CNTs) have been extensively studied for these applications. However, the as-deposited features are often undesirably altered upon liquid infiltration and evaporation due to capillarity-driven aggregation of the low density CNTs...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29127488/the-influence-of-synthesis-parameters-on-vertically-aligned-cnt-sheets-empirical-modeling-and-process-optimization-using-response-surface-methodology
#8
Seyed Mohsen Hosseini, Vahid Pirouzfar, Hamed Azami
In the present work, vertically aligned carbon nanotube (VA-CNT) sheets were synthesized via pyrolysis of polybenzimidazole (PBI)-Kapton inside the pores of anodized aluminum oxide (AAO). The synthesized VA-CNT sheets were then evaluated for the desalination of salty water. The results indicated that the VA-CNT sheets were effective for application as an adsorbent for desalination of salty water due to their high adsorption capacity, with no loss of CNTs in the treated water. This study explored the impact of operating time and temperature on liquid adsorption performance through optimization and modeling methods...
November 10, 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/29119158/resonance-raman-and-ir-spectroscopy-of-aligned-carbon-nanotube-arrays-with-extremely-narrow-diameters-prepared-with-molecular-catalysts-on-steel-substrates
#9
Sagar Motilal Jain, Federico Cesano, Domenica Scarano, Tomas Edvinsson
Carbon nanotubes (CNTs) are considered promising for a large range of emerging technologies ranging from advanced electronics to utilization as nanoreactors. Here we report a controlled facile synthesis of aligned carbon nanotubes with very small dimensions directly grown on steel grid substrates via two-step catalytic chemical vapor deposition (CCVD) of a molecular catalyst (ferrocene) with ethylene as the carbon source. The system is characterized by resonance Raman spectroscopy and the results show single walled carbon nanotube (SWCNT) arrays composed of 0...
November 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29064823/graphene-vertically-aligned-carbon-nanotube-hybrid-on-pdms-as-stretchable-electrodes
#10
Junjun Ding, Shichen Fu, Runzhi Zhang, Eric Boon, Woo Lee, Frank T Fisher, Eui-Hyeok Yang
Stretchable electrodes are a critical component for flexible electronics such as displays, energy devices, and wearable sensors. Carbon nanotubes (CNTs) and graphene have been considered for flexible electrode applications, due to their mechanical strength, high carrier mobility, and excellent thermal conductivity. Vertically aligned carbon nanotubes (VACNTs) provide the possibility to serve as interconnects to graphene sheets as stretchable electrodes that could maintain high electrical conductivity under large tensile strain...
October 24, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28976178/thermally-stable-and-electrically-conductive-vertically-aligned-carbon-nanotube-silicon-infiltrated-composite-structures-for-high-temperature-electrodes
#11
Qi Ming Zou, Lei Min Deng, Da Wei Li, Yun Shen Zhou, Hossein Rabiee Golgir, Kamran Keramatnejad, Li Sha Fan, Lan Jiang, Jean-Francois Silvain, Yong Feng Lu
Traditional ceramic-based, high-temperature electrode materials (e.g., lanthanum chromate) are severely limited due to their conditional electrical conductivity and poor stability under harsh circumstances. Advanced composite structures based on vertically aligned carbon nanotubes (VACNTs) and high-temperature ceramics are expected to address this grand challenge, in which ceramic serves as a shielding layer protecting the VACNTs from the oxidation and erosive environment, while the VACNTs work as a conductor...
October 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28933472/gas-adsorption-capacity-in-an-all-carbon-nanomaterial-composed-of-carbon-nanohorns-and-vertically-aligned-carbon-nanotubes
#12
Divya Puthusseri, Deepu J Babu, Sherif Okeil, Jörg J Schneider
Whereas vertically aligned carbon nanotubes (VACNTs) typically show a promising adsorption behavior at high pressures, carbon nanohorns (CNHs) exhibit superior gas adsorption properties in the low pressure regime due to their inherent microporosity. These adsorption characteristics are further enhanced when both materials are opened at their tips. The so prepared composite material allows one to investigate the effect of physical entrapment of CO2 molecules within the specific adsorption sites of VACNTs composed of opened double walled carbon nanotubes (CNTs) and in specific adsorption sites created by spherically aggregated opened single walled carbon nanohorns...
October 4, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28904833/fluorination-of-vertically-aligned-carbon-nanotubes-from-cf4-plasma-chemistry-to-surface-functionalization
#13
Claudia Struzzi, Mattia Scardamaglia, Jean-François Colomer, Alberto Verdini, Luca Floreano, Rony Snyders, Carla Bittencourt
The surface chemistry of plasma fluorinated vertically aligned carbon nanotubes (vCNT) is correlated to the CF4 plasma chemical composition. The results obtained via FTIR and mass spectrometry are combined with the XPS and Raman analysis of the sample surface showing the dependence on different plasma parameters (power, time and distance from the plasma region) on the resulting fluorination. Photoemission and absorption spectroscopies are used to investigate the evolution of the electronic properties as a function of the fluorine content at the vCNT surface...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28891805/graphene-vertically-aligned-carbon-nanotube-hybrid-on-pdms-as-stretchable-electrodes
#14
Junjun Ding, Shichen Fu, Runzhi Zhang, Eric Peter Boon, Woo Lee, Frank T Fisher, Eui-Hyeok Yang
Stretchable electrodes are a critical component for flexible electronics such as displays, energy devices, and wearable sensors. Carbon nanotubes (CNTs) and graphene have been considered for flexible electrode applications, due to their mechanical strength, high carrier mobility, and excellent thermal conductivity. Vertically aligned carbon nanotubes (VACNTs) provide the possibility to serve as interconnects to graphene sheets as stretchable electrodes that could maintain high electrical conductivity under large tensile strain...
September 11, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28842644/influence-of-synthesis-parameters-on-ccvd-growth-of-vertically-aligned-carbon-nanotubes-over-aluminum-substrate
#15
Anna Szabó, Egon Kecsenovity, Zsuzsanna Pápa, Tamás Gyulavári, Krisztián Németh, Endre Horvath, Klara Hernadi
In the past two decades, important results have been achieved in the field of carbon nanotube (CNT) research, which revealed that carbon nanotubes have extremely good electrical and mechanical properties The range of applications widens more, if CNTs form a forest-like, vertically aligned structure (VACNT) Although, VACNT-conductive substrate structure could be very advantageous for various applications, to produce proper system without barrier films i.e. with good electrical contact is still a challenge. The aim of the current work is to develop a cheap and easy method for growing carbon nanotubes forests on conductive substrate with the CCVD (Catalytic Chemical Vapor Deposition) technique at 640 °C...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28773219/ion-beam-modification-of-carbon-nanotube-yarn-in-air-and-vacuum
#16
Jonathan G Gigax, Philip D Bradford, Lin Shao
We studied the effects ion beam irradiation on carbon nanotube (CNT) yarns. CNT yarn was fabricated by drawing and spinning CNT sheets from a vertically aligned CNT forest. The yarn was irradiated by 2.5 MeV protons in either vacuum or air. Irradiation in air was achieved by directing the proton beam through a 0.025 mm thick Ti window. Irradiation in vacuum occurred at a pressure of <10(-6) torr at room temperature and at an elevated temperature of 600 °C. Tensile testing revealed that CNT yarn irradiated in air increased in tensile strength with increasing proton fluence...
July 27, 2017: Materials
https://www.readbyqxmd.com/read/28772567/compressive-strength-enhancement-of-vertically-aligned-carbon-nanotube-forests-by-constraint-of-graphene-sheets
#17
Chih-Chung Su, Ting-Xu Chen, Shuo-Hung Chang
We fabricated a 3D sandwich hybrid material composed of graphene and vertically aligned carbon nanotube forests (VACNTs) using chemical vapor deposition. The graphene was first synthesized on Cu foil. Then it was transferred to a substrate which had a pre-deposited catalyst Fe film and a buffer film of Al₂O₃ for the growth of VACNTs. The VACNTs were grown underneath the graphene and lifted up the graphene. The graphene, with its edges anchored on the Al₂O₃, provided a constrained boundary condition for the VACNTs and hence affected the growth height and mechanical strength of the VACNTs...
February 21, 2017: Materials
https://www.readbyqxmd.com/read/28772073/extremely-black-vertically-aligned-carbon-nanotube-arrays-for-solar-steam-generation
#18
Zhe Yin, Huimin Wang, Muqiang Jian, Yanshen Li, Kailun Xia, Mingchao Zhang, Chunya Wang, Qi Wang, Ming Ma, Quan-Shui Zheng, Yingying Zhang
The unique structure of a vertically aligned carbon nanotube (VACNT) array makes it behave most similarly to a blackbody. It is reported that the optical absorptivity of an extremely black VACNT array is about 0.98-0.99 over a large spectral range of 200 nm-200 μm, inspiring us to explore the performance of VACNT arrays in solar energy harvesting. In this work, we report the highly efficient steam generation simply by laminating a layer of VACNT array on the surface of water to harvest solar energy. It is found that under solar illumination the temperature of upper water can significantly increase with obvious water steam generated, indicating the efficient solar energy harvesting and local temperature rise by the thin layer of VACNTs...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28737504/laser-driven-coating-of-vertically-aligned-carbon-nanotubes-with-manganese-oxide-from-metal-organic-precursors-for-energy-storage
#19
Angel Perez Del Pino, Eniko Gyorgy, Islam Alshaikh, Fernando Pantoja-Suárez, José Luis Andújar, Esther Pascual, Roger Amade, Enric Bertran Serra
Carbon nanotubes-transition metal oxide systems are intensively studied due to their excellent properties for electrochemical applications. In this work, an innovative procedure is developed for the synthesis of vertically aligned multi-walled carbon nanotubes (VACNTs) coated with transition metal oxide nanostructures. VACNTs are grown by plasma enhanced chemical vapor deposition and coated with a manganese-based metal organic precursor (MOP) film based on manganese acetate solution. Subsequent UV pulsed laser irradiation induces the effective heating-decomposition of the MOP leading to the crystallization of manganese oxide nanostructures on the VACNT surface...
July 24, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28699920/systematic-periodicity-in-waviness-of-vertically-aligned-carbon-nanotubes-explained-by-helical-buckling
#20
Mehdi Jahangiri
A hypothesis is proposed in this work to account for the geometry of individual vertically aligned carbon nanotubes (VACNTs) that not only justifies the directionality of their growth, but also explains the origin of the waviness frequently reported for these nanotube forests. Such waviness has fundamental effects on the transport/conduction properties of VACNTs, either through or along them, regarding phenomena such as mass, stress, heat and electricity. Despite the general opinion about randomness of CNTs tortuosity, we demonstrate here that rules of helical buckling of tubular strings is applicable to VACNTs, based on which a regular 3D helical geometry is proposed for VACNTs, with a 2D sine wave shape side-profile...
July 12, 2017: Nanotechnology
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