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https://www.readbyqxmd.com/read/28934663/using-a-fluorescence-quenching-method-to-detect-dna-adsorption-onto-single-walled-carbon-nanotube-surfaces
#1
Kazuo Umemura, Shizuma Sato, Gilbert Bustamante, Jing Yong Ye
Surface modification of single-walled carbon nanotubes (SWNTs) with DNA molecules has attracted much attention in recent years to increase SWNT solubility and make various SWNT-based nanobiodevices. Therefore, there is a critical need to quantify the interaction between DNA molecules and SWNT surfaces, particularly the intermediate structures during DNA adsorption. In this study, we demonstrate the ability to detect the adsorption of DNA oligomers on SWNT surfaces by fluorescence spectroscopy. Fluorescein-labelled, 30mer, thymine oligonucleotides (F-T30) were employed as a fluorescent probe to study the interaction of DNA with SWNTs...
September 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28926252/absolute-enantiomeric-excess-determination-of-carbon-nanotubes-ensemble-by-symmetry-breaking-using-optical-titration-method
#2
Jinsook Sim, Somin Kim, Myungsu Jang, Minsuk Park, Hyunkyu Oh, Sang-Yong Ju
Symmetry breaking of single-walled carbon nanotubes (SWNTs) has profound effects on their optoelectronic properties which are essential for fundamental study and applications. Here, we show that isomeric SWNT which exhibit identical photoluminescence (PL) undergo symmetry breaking by flavin mononucleotide (FMN) and exhibits dual PLs and different binding affinity (Ka). Increasing FMN concentration leads to systematic PL shifts of SWNT according to structural modality and handedness due to symmetry breaking...
September 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28915730/adsorption-and-diffusion-of-fluids-in-defective-carbon-nanotubes-insights-from-molecular-simulations
#3
Benjamin J Bucior, German V Kolmakov, JoAnna M Male, Jinchen Liu, De-Li Chen, Prashant Kumar, J Karl Johnson
Single-walled carbon nanotubes (SWNTs) have been shown from both simulations and experiments to have remarkably low resistance to gas and liquid transport. This has been attributed to the remarkably smooth interior surface of pristine SWNTs. However, real SWNTs are known to have various defects that depend on the synthesis method and procedure used to activate the SWNTs. In this paper we study adsorption and transport properties of atomic and molecular gases and fluids in SWNTs having vacancy point defects...
September 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28905626/dna-assisted-dispersion-of-carbon-nanotubes-and-comparison-with-other-dispersing-agents
#4
Debabrata Pramanik, Prabal K K Maiti
Separation and sorting of pristine carbon nanotubes (CNTs) from bundle geometry is a very challenging task due to non-soluble and non-dispersive nature of CNTs in aqueous medium. Recently many studies have been performed to address this problem using various organic and inorganic solutions, surfactant molecules and biomolecules as dispersing agents. Recent experimental studies have reported the DNA to be highly efficient in dispersion of CNTs from bundle geometry. But there is no microscopic study and also quantitative estimation of the dispersion efficiency of the DNA...
September 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28857275/size-of-single-wall-carbon-nanotube-affects-the-folate-receptor-mediated-cancer-cell-targeting
#5
Fahimeh Charbgoo, Mehrdad Behmanesh, Maryam Nikkhah
Advances in nanobiotechnology and targeting strategy could improve the delivery of therapeutic molecules into cancer cells, leading to improved treatment efficiency with minimal side effects on normal cells. To design an efficient nanocarrier, consideration of parameters that facilitate direct drug delivery into the target cells is important. We studied the effect of single wall carbon nanotubes size on their cell internalization level via the folate receptor-mediated pathway through folic acid targeting. Folate-SWNTs were covalently synthesized and characterized...
August 30, 2017: Biotechnology and Applied Biochemistry
https://www.readbyqxmd.com/read/28834264/wafer-scale-fabrication-of-suspended-single-walled-carbon-nanotube-arrays-by-silver-liquid-dynamics
#6
Jian Zhang, Siyu Liu, Jean Pierre Nshimiyimana, Ya Deng, Gu Hou, Xiannian Chi, Xiao Hu, Zongzhi Zhang, Pei Wu, Gongtang Wang, Weiguo Chu, Lianfeng Sun
Suspended single-walled carbon nanotubes (SWNTs) have advantages in mechanical resonators and highly sensitive sensors. Large-scale fabrication of suspended SWNTs array devices and uniformity among SWNTs devices remain a great challenge. This study demonstrates an effective, fast, and wafer-scale technique to fabricate suspended SWNT arrays, which is based on a dynamic motion of silver liquid to suspend and align the SWNTs between the prefabricated palladium electrodes in high temperature annealing treatment...
August 21, 2017: Small
https://www.readbyqxmd.com/read/28808941/review-of-electronics-based-on-single-walled-carbon-nanotubes
#7
REVIEW
Yu Cao, Sen Cong, Xuan Cao, Fanqi Wu, Qingzhou Liu, Moh R Amer, Chongwu Zhou
Single-walled carbon nanotubes (SWNTs) are extremely promising materials for building next-generation electronics due to their unique physical and electronic properties. In this article, we will review the research efforts and achievements of SWNTs in three electronic fields, namely analog radio-frequency electronics, digital electronics, and macroelectronics. In each SWNT-based electronic field, we will present the major challenges, the evolutions of the methods to overcome these challenges, and the state-of-the-art of the achievements...
August 14, 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28745872/investigating-limiting-factors-in-stretchable-all-carbon-transistors-for-reliable-stretchable-electronics
#8
Alex Chortos, Chenxin Zhu, Jin Young Oh, Xuzhou Yan, Igor Pochorovski, John W-F To, Nan Liu, Ulrike Kraft, Boris Murmann, Zhenan Bao
Stretchable form factors enable electronic devices to conform to irregular 3D structures, including soft and moving entities. Intrinsically stretchable devices have potential advantages of high surface coverage of active devices, improved durability, and reduced processing costs. This work describes intrinsically stretchable transistors composed of single-walled carbon nanotube (SWNT) electrodes and semiconductors and a dielectric that consists of a nonpolar elastomer. The use of a nonpolar elastomer dielectric enabled hysteresis-free device characteristics...
August 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28742363/improved-performance-of-glucose-bioanodes-using-composites-of-7-6-single-walled-carbon-nanotubes-and-a-ferrocene-lpei-redox-polymer
#9
Jie Chen, Rujuta Munje, Nicholas P Godman, Shalini Prasad, Daniel T Glatzhofer, David W Schmidtke
The effect of incorporating different types of carbon nanotubes into composite films of a redox polymer (FcMe2-C3-LPEI) and glucose oxidase (GOX) was investigated. The composite films were constructed by first forming a high-surface area network film of either single-walled carbon nanotubes (SWNTs) or multiwalled carbon nanotubes (MWNTs) on a glassy carbon electrode (GCE) by solution casting of a suspension of Triton-X-100 dispersed SWNTs. Next a glucose responsive redox hydrogel was formed on top of the nanotube-modified electrode by cross-linking FcMe2-C3-LPEI with glucose oxidase via ethylene glycol diglycidyl ether (EGDGE)...
July 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28742321/understanding-the-effect-of-functional-groups-on-the-seeded-growth-of-copper-on-carbon-nanotubes-for-optimizing-electrical-transmission
#10
Kourtney D Wright, Cathren E Gowenlock, Joseph C Bear, Andrew R Barron
We present a study of the seeded growth of copper on the surface of two classes of single-walled carbon nanotubes (SWNTs) in order to compare the effects of surface functional groups. Pyridine-functionalized HiPco SWNTs and ultrashort SWNTs (US-SWNTs) were synthesized (py-SWNTs and py-US-SWNTs, respectively), and the functionality was used as seed sites for copper, via an aqueous electroless deposition reaction, as a comparison to the carboxylic acid functionality present on piranha-etched SWNTs and the native US-SWNTs...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28729686/ultralow-voltage-operation-of-biologically-assembled-all-carbon-nanotube-nanomesh-transistors-with-ion-gel-gate-dielectrics
#11
Hye-Hyeon Byeon, Kein Kim, Woong Kim, Hyunjung Yi
The demonstration of field-effect transistors (FETs) based entirely on single-walled carbon nanotubes (SWNTs) would enable the fabrication of high-on-current, flexible, transparent and stretchable devices owing to the excellent electrical, optical, and mechanical properties of SWNTs. Fabricating all-SWNT-based FETs via simple solution process, at room temperature and without using lithography and vacuum process could further broaden the applicability of all-SWNT-FETs. In this work, we report on biologically assembled all SWNT-based transistors and demonstrate that ion-gel-gated network structures of unsorted SWNTs assembled using a biological template material enabled operation of SWNT-based transistors at a very low voltage...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28718919/putting-rings-around-carbon-nanotubes
#12
Emilio M Pérez
In the last five years, we have developed synthetic methods towards encapsulation of single-walled carbon nanotubes (SWNTs) into organic macrocycles, to form rotaxane-type molecules. These are the first examples of mechanically interlocked SWNT derivatives (MINTs). In this article, the motivation to continue developing the chemistry of SWNTs at a time well past their hype is discussed and our synthetic strategy and characterization methodology is explained in detail, stressing the general aspects. In particular, special emphasis is placed on the importance of adequate control experiments and bulk spectroscopic and analytical data to determine the structure of SWNT derivatives, as opposed to relying only (or mostly) on microscopy...
July 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28685912/understanding-noncovalent-interactions-of-small-molecules-with-carbon-nanotubes
#13
Joaquín Calbo, Alejandro López-Moreno, Alberto de Juan, Jeffrey Comer, Enrique Ortí, Emilio M Pérez
We combine experimental methods, density functional theory (DFT) calculations, and molecular dynamics (MD) simulations in the quantitative analysis of noncovalent interactions between (6,5)-enriched single-walled carbon nanotubes (SWNTs), as hosts, and a set of pyrene derivatives with different electronic properties and surface areas, as guests. The experiments and calculations were carried out in two solvents with markedly different polarities, namely 1,1',2,2'-tetrachloroethane (TCE) and N,N-dimethylformamide (DMF)...
July 7, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28675034/electropolymerized-pyrrole-based-conductive-polymeric-ionic-liquids-and-their-application-for-solid-phase-microextraction
#14
Amila M Devasurendra, Cheng Zhang, Joshua A Young, L M Viranga Tillekeratne, Jared L Anderson, Jon R Kirchhoff
Pyrrole was covalently bonded to 1-methyl and 1-benzylimidazolium ionic liquids (ILs) via an N-substituted alkyl linkage to prepare electropolymerizable IL monomers with excellent thermal stability. The methylimidazolium IL, [pyrrole-C6MIm](+), was then electropolymerized on macro- and microelectrode materials to form conductive polymeric IL (CPIL)-modified surfaces. Electrochemical characterization of a 1.6 mm diameter Pt disk electrode modified with poly[pyrrole-C6MIm](+) demonstrated a selective uptake for an anionic redox probe while rejecting a cationic redox probe...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28642951/intermix-of-metal-nanoparticles-single-wall-carbon-nanotubes
#15
Feng Xu, Qin Lu, Lin Ye, S C Edman Tsang
Using physical mixtures of Pd/SWNTs (Pd nanoparticles on single-walled carbon nanotubes) and Pt/SWNTs, the composites show electro-catalytic properties comparable to the corresponding alloys: electron exchange readily occurs between the two metal nanoparticles via SWNT support at long ranges without direct atomic contact, which is responsible for the tunable alloy-like properties.
July 4, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28631625/high-loading-fe2o3-swnt-composite-films-for-lithium-ion-battery-applications
#16
Ying Wang, Jiahui Guo, Li Li, Yali Ge, Baojun Li, Yingjiu Zhang, Yuanyuan Shang, Anyuan Cao
Single-walled carbon nanotube (SWNT) films are a potential candidate as porous conductive electrodes for energy conversion and storage; tailoring the loading and distribution of active materials grafted on SWNTs is critical for achieving maximum performance. Here, we show that as-synthesized SWNT samples containing residual Fe catalyst can be directly converted to Fe2O3/SWNT composite films by thermal annealing in air. The mass loading of Fe2O3 nanoparticles is tunable from 63 wt.% up to 96 wt.%, depending on the annealing temperature (from 450 C to 600 C), while maintaining the porous network structure...
June 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28617574/synergistic-suppression-of-tumor-angiogenesis-by-the-co-delivering-of-vascular-endothelial-growth-factor-targeted-sirna-and-candesartan-mediated-by-functionalized-carbon-nanovectors
#17
Xuefang Ding, Yujie Su, Cheng Wang, Fangrong Zhang, Kerong Chen, Yu Wang, Min Li, Wei Wang
Single-walled carbon nanotubes (SWNTs) with unique physicochemical properties have exhibited promising biomedical applications as drug and gene carriers. In this study, polyethylenimine (PEI)-modified SWNT conjugates linked with candesartan (CD) were developed to deliver vascular endothelial growth factor (VEGF)-targeted siRNA (siVEGF) for the synergistic and targeted treatment of tumor angiogenesis. The characterization results revealed that SWNT-PEI-CD conjugates were successfully synthesized and exhibited desirable dispersibility and superior stability...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28590493/novel-properties-of-0d-metal-organic-polyhedra-bonded-to-the-surfaces-of-2d-graphene-and-1d-single-walled-carbon-nanotubes
#18
Ram Kumar, C N R Rao
A strategy for the stabilization of metal-organic polyhedra (MOP) cages on graphene (Gr) and single-walled carbon nanotubes (NT) is reported. The surface area of the composites, MOPGr and MOPNT increases by an order of magnitude with a significant increase in pore volume in comparison to bulk MOP. The composites show an enhancement in the catalytic activity of up to ∼80% relative to bulk MOP in the conversion of propylene oxide into propylene carbonate. Depositing individual MOP cages on graphene or SWNT surfaces is beneficial in terms of gas adsorption and catalytic properties and provides a good example for useful effects of bonding materials of different dimensionalities...
June 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28569888/narrow-linewidth-carbon-nanotube-emission-in-silicon-hollow-core-photonic-crystal-cavity
#19
Thi Hong Cam Hoang, Elena Durán-Valdeiglesias, Carlos Alonso-Ramos, Samuel Serna, Weiwei Zhang, Matteo Balestrieri, Al-Saleh Keita, Niccolò Caselli, Francesco Biccari, Xavier Le Roux, Arianna Filoramo, Massimo Gurioli, Laurent Vivien, Eric Cassan
Polymer-sorted semiconducting single-walled carbon nanotubes (SWNTs) provide room-temperature emission at near-infrared wavelengths, with potential for large volume production of high-quality solutions and wafer-scale deposition. These features make SWNTs a very attractive material for the realization of on-chip light sources. Coupling SWNT into optical microcavities could enhance and guide their emission, while enabling spectral selection by cavity resonance engineering. This could allow the realization of bright, narrowband sources...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28544754/heterogeneous-integration-of-carbon-nanotube-graphene-for-high-performance-flexible-and-transparent-photodetectors
#20
Soonjae Pyo, Wondo Kim, Han-Il Jung, Jungwook Choi, Jongbaeg Kim
Low-dimensional carbon materials, such as semiconducting carbon nanotubes (CNTs), conducting graphene, and their hybrids, are of great interest as promising candidates for flexible, foldable, and transparent electronics. However, the development of highly photoresponsive, flexible, and transparent optoelectronics still remains limited due to their low absorbance and fast recombination rate of photoexcited charges, despite the considerable potential of photodetectors for future wearable and foldable devices...
May 24, 2017: Small
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