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Craig A Milroy, Seonpil Jang, Toshihiko Fujimori, Ananth Dodabalapur, Arumugam Manthiram
Improved thin-film microbatteries are needed to provide appropriate energy-storage options to power the multitude of devices that will bring the proposed "Internet of Things" network to fruition (e.g., active radio-frequency identification tags and microcontrollers for wearable and implantable devices). Although impressive efforts have been made to improve the energy density of 3D microbatteries, they have all used low energy-density lithium-ion chemistries, which present a fundamental barrier to miniaturization...
January 11, 2017: Small
Jing Wang, Fang Fang, Tao Yuan, Junhe Yang, Liang Chen, Chi Yao, Shiyou Zheng, Dalin Sun
A unique 3D graphene-single wall carbon nanotube (G-SWNT) aerogel anchored with SnO2 nanoparticles (SnO2@G-SWCNT) is fabricated by hydrothermal self-assembly process. The influences of mass ratio of SWCNT to graphene on structure and electrochemical properties of SnO2@G-SWCNT are investigated systematically. The SnO2@G-SWCNT composites show excellent electrochemical performance in Li-ion batteries, for instance, at a current density of 100 mA g-1, a specific capacity of 758 mAh g-1 was obtained for the SnO2@G-SWCNT with 50 % SWCNT in G-SWCNT and the coulombic efficiency is close to 100 % after 200 cycles; even at current density of 1 A g-1, it can still maintain a stable specific capacity of 537 mAh g-1 after 300 cycles...
January 6, 2017: ACS Applied Materials & Interfaces
Yifan Li, Yi Zhou, Xuyan Zhou, Long Wang, Hui Li
Molecular dynamics simulation has been employed to study the encapsulation of boron nitride-graphene nanoribbons (BNCNRs) in a single-walled carbon nanotube (SWNT). The simulation results show that a helical BNCNR with large curvature can uncoil repeatedly and spontaneously in the SWNT, like the unwinding of the DNA in the nucleus. The uncoiling of the BNCNRs is accompanied by a system energy exchange between non-bonding energy and elastic potential energy due to the competition between the induction of graphene nanoribbon (GNR) segments and the resistance of boron nitride nanoribbon (BNNR) segments...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
Joon Hyub Kim, Min-Jung Song, Ki Beom Kim, Joon-Hyung Jin, Nam Ki Min
The effect of cleaning the surface of single-walled carbon nanotube (SWNT) networks by thermal and the O₂ plasma treatments is presented in terms of NH₃ gas sensing characteristics. The goal of this work is to determine the relationship between the physicochemical properties of the cleaned surface (including the chemical composition, crystal structure, hydrophilicity, and impurity content) and the sensitivity of the SWNT network films to NH₃ gas. The SWNT networks are spray-deposited on pre-patterned Pt electrodes, and are further functionalized by heating on a programmable hot plate or by O₂ plasma treatment in a laboratory-prepared plasma chamber...
December 30, 2016: Sensors
Zi-He Jin, Yan-Ling Liu, Jing-Jing Chen, Si-Liang Cai, Jiaquan Xu, Wei-Hua Huang
Carbon nanotube (CNT)-based flexible sensors have been intensively developed for physical sensing. However, great challenges remain in fabricating stretchable CNT films with high electrochemical performance for real-time chemical sensing, owing to large sheet resistance of CNT film and further resistance increase caused by separation between each CNT during stretching. Herein, we develop a facile and versatile strategy to construct single walled carbon nanotubes (SWNTs)-based stretchable and transparent electrochemical sensors, by coating and binding each SWNT with conductive polymer...
December 28, 2016: Analytical Chemistry
Ghada I Koleilat, Michael Vosgueritchian, Ting Lei, Yan Zhou, Debora W Lin, Franziska Lissel, Pei Lin, John W F To, Tian Xie, Kemar England, Yue Zhang, Zhenan Bao
Semiconducting single-walled carbon nanotube (s-SWNT) light sensitized devices, such as infrared photodetectors and solar cells, have recently been widely reported. Despite their excellent individual electrical properties, efficient carrier transport from one carbon nanotube to another remains a fundamental challenge. Specifically, photovoltaic devices with active layers made from s-SWNTs have suffered from low efficiencies caused by three main challenges: the overwhelming presence of high-bandgap polymers in the films, the weak bandgap offset between the LUMO of the s-SWNTs and the acceptor C60, and the limited exciton diffusion length from one SWNT to another of around 5 nm that limits the carrier extraction efficiency...
December 27, 2016: ACS Nano
Wang Gao, Yun Chen, Qing Jiang
Discriminating between metallic (M) and semiconducting (S) single-walled carbon nanotubes (SWNTs) remains a fundamental challenge in the field of nanotechnology. We address this issue by studying the adsorption of the isotropic atoms Xe, Kr, and a highly anisotropic molecule n heptane on M- and S-SWNTs with density functional theory that includes many-body dispersion forces. We find that the distinct polarizabilities of M- and S-SWNTs exhibit significantly different physisorption properties, which are also strongly controlled by the SWNT's diameter, adsorption site, adsorbate coverage, and the adsorbate's anisotropy...
December 9, 2016: Physical Review Letters
Andrei A Eliseev, Nikolay S Falaleev, Nikolay I Verbitskiy, Andrey A Volykhov, Lada V Yashina, Andrey Kumskov, Victoria G Zhigalina, Alexander L Vasiliev, Alexey V Lukashin, Jeremy Sloan, Nikolay A Kiselev
Structural organization of compounds in a confined space of nanometer-scale cavities is of fundamental importance for understanding the basic principles for atomic structure design at the nanolevel. Here, we explore size-dependent structure relations between one-dimensional PbTe nanocrystals and carbon nanotube containers in the diameter range of 2.0 - 1.25 nm using HRTEM and ab initio calculations. Upon decrease of the confining volume, one-dimensional crystals reveal gradual thinning, with the structure being cut from the bulk in either a <110> or <100> growth direction till a certain limit of ~1...
December 22, 2016: Nano Letters
Ahmad R T Nugraha, Eddwi H Hasdeo, Riichiro Saito
The pulse-train technique within ultrafast pump-probe spectroscopy is theoretically investigated to excite a specific coherent phonon mode while suppressing the other phonon modes generated in single-wall carbon nanotubes (SWNTs). In particular, we focus on the selectivity of the radial breathing mode (RBM) and the G-band for a given SWNT. We find that if the repetition period of the pulse train matches with the integer multiple of the RBM phonon period, the RBM amplitude can be maintained while the amplitudes of the other modes are suppressed...
February 8, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Seung-Hoon Lee, Yong Xu, Dongyoon Khim, Won-Tae Park, Dong-Yu Kim, Yong-Young Noh
Charge transport in carbon nanotube network transistors strongly depends on the properties of the gate dielectric that is in direct contact with the semiconducting carbon nanotubes. In this work, we investigate the dielectric effects on charge transport in polymer-sorted semiconducting single-walled carbon nanotube field-effect transistors (s-SWNT-FETs) by using three different polymer insulators: A low-permittivity (εr) fluoropolymer (CYTOP, εr = 1.8), poly(methyl methacrylate) (PMMA, εr = 3.3), and a high-εr ferroelectric relaxor [P(VDF-TrFE-CTFE), εr = 14...
November 30, 2016: ACS Applied Materials & Interfaces
Jianing An, Zhaoyao Zhan, Gengzhi Sun, Hari Krishna Salila Vijayalal Mohan, Jinyuan Zhou, Young-Jin Kim, Lianxi Zheng
Leveraging the unique properties of single-walled carbon nanotube (SWNT) intramolecular junctions (IMJs) in innovative nanodevices and next-generation nanoelectronics requires controllable, repeatable, and large-scale preparation, together with rapid identification and comprehensive characterization of such structures. Here we demonstrate SWNT IMJs through directly growing ultralong SWNTs on trenched substrates. It is found that the trench configurations introduce axial strain in partially suspended nanotubes, and promote bending deformation in the vicinity of the trench edges...
December 1, 2016: Scientific Reports
Pan Li, Jin Zhang
The synthesis of SWNTs has achieved great success with the development of synthetic methodologies. From the viewpoint of exploiting the exceptional electrical properties of single-walled carbon nanotubes (SWNTs) in advanced applications, one of the most difficult challenges is how to assemble the SWNTs with high degrees of alignment and purity in electronic conducting (mainly semiconducting) behavior into functional nanodevices. Numerous approaches have been developed to reach this goal, which could be divided into two categories...
December 2016: Topics in Current Chemistry (Journal)
Bing Zhang, Jia Xu, Shu-Fan Mo, Jian-Xi Yao, Song-Yuan Dai
Electron transfer between cytochrome c (Cytc) and electrodes can be influenced greatly by the orientation of protein on the surface of the electrodes. In the present study, different initial orientations of Cytc on the surface of five types of single-walled carbon nanotubes (SWNTs), with different diameters and chirality, were constructed. Properties of the orientations of proteins on the surface of these tubes were first investigated through molecular dynamics simulations. It was shown that variations in SWNT diameter do not significantly affect the orientation; however, the chirality of the SWNTs is crucial to the orientation of the heme embedded in Cytc, and the orientation of the protein can consequently be influenced by the heme orientation...
December 2016: Journal of Molecular Modeling
Satoshi Yasuda, Shinji Hoshina, Shohei Chiashi, Shigeo Maruyama, Kei Murakoshi
We present an electronic structural analysis of an individual single-walled carbon nanotube (SWNT) by employing electrochemical surface-enhanced Raman scattering (SERS). An isolated SWNT was supported on a well-defined Au nanodimer structure, which possesses a localized surface plasmon resonance (LSPR) field at the nanogap, and highly intense SERS spectra were obtained for the SWNT at the gap region. The absolute potential of the Fermi level of the isolated SWNT in an ionic liquid was determined from the electrochemical potential dependence of the SERS intensity showing the dependence on the chirality of SWNTs...
December 7, 2016: Nanoscale
Nikita V Kurnosov, Victor S Leontiev, Victor A Karachevtsev
The influence of tip sonication duration on the spectral characteristics of carbon single-walled nanotubes (SWNTs) in aqueous suspension with single-stranded DNA (ssDNA) has been studied by NIR luminescence, NIR absorption, and Raman spectroscopy. It was revealed that prolongation of sonication leads to weakening of the SWNT polymer coverage and appearance of additional defects on the nanotube surface. Prolongation of the tip sonication treatment of SWNT/ssDNA from 30 to 90 min leads to the increase of the number of individual nanotubes in the aqueous suspension, but it significantly decreases the photoluminescence (PL) from semiconducting SWNTs because more defects are formed on the nanotube surface...
December 2016: Nanoscale Research Letters
Hareem Maune, Si-Ping Han
Single-walled carbon nanotubes (SWNT or CNT) have unique and well-known high-performance material properties that can enable revolutionary increases in the performance of electronic devices and architectures. However, fabrication of large-scale SWNT-based ICs is an enormously challenging, unsolved problem, and self-assembly is likely needed for critical steps. Over the past several years, methods have been introduced to created ordered carbon nanotube structures using DNA guided self-assembly. In this chapter, we briefly review the challenges involved in using DNA to assemble SWNT nanostructures, and then give detailed methods to assemble dense, aligned SWNT arrays...
2017: Methods in Molecular Biology
Yutaka Maeda, Yuya Takehana, Jing-Shuang Dang, Mitsuaki Suzuki, Michio Yamada, Shigeru Nagase
Alkylated single-walled carbon nanotubes (SWNTs) have been thermally treated to determine the influence of substituents and the degree of functionalization on their thermal stability and photoluminescence (PL) properties. Alkylated SWNTs were prepared by treating SWNTs with sodium naphthalenide and alkyl bromide. The defunctionalization of the alkylated SWNTs was monitored by absorption and Raman spectra. Selective recovery of the characteristic absorption and radial breathing mode peaks was observed during the thermal treatment, which indicates that the thermal stability of the alkylated SWNTs decreases with increases in SWNT diameter and degree of functionalization...
October 24, 2016: Chemistry: a European Journal
George F Reiter, Aniruddha Deb, Y Sakurai, M Itou, A I Kolesnikov
X-ray Compton scattering measurements of the electron momentum distribution in water confined in both single-walled and double-walled carbon nanotubes (SWNT and DWNT), as a function of temperature and confinement size are presented here together with earlier measurements of the proton momentum distribution in the same systems using neutron Compton scattering. These studies provide a coherent picture of an anomalous state of water that exists because of nanoconfinement. This state cannot be described by the weakly interacting molecule picture...
November 17, 2016: Journal of Physical Chemistry Letters
Griet Depotter, Jean-Hubert Olivier, Mary G Glesner, Pravas Deria, Yusong Bai, George Bullard, Amar S Kumbhar, Michael J Therien, Koen Clays
We report the first-order hyperpolarizabilities (βHRS values) of individualized, length-sorted (700 ± 50 nm long) (6,5) SWNTs and corresponding polymer-wrapped (6,5) SWNT superstructures. These SWNT-based nanohybrids feature semiconducting polymers that wrap the SWNT surface in an exclusive left-handed helical fashion. Manipulation of the polymer electronic structures in these well-defined nanoscale objects provides a new avenue to modulate the magnitude of βHRS at long wavelength (1280 nm).
October 6, 2016: Chemical Communications: Chem Comm
Yoko Matsuzawa, Yuko Takada, Hirokuni Jintoku, Hideyuki Kihara, Masaru Yoshida
We describe the application of photodetachable and recyclable dispersants for SWNTs in the fabrication of photo-patterned SWNT thin films. Because the adsorption and desorption of the dispersants on the SWNT surfaces affect not only their dispersibility in water but also their solubility, SWNT photo-patterns were obtained on glass substrates in only three steps, i.e. casting the SWNT/dispersants solution, UV-light exposure of the casted SWNT/dispersants films through a photomask, and subsequent rinsing with neutral water...
October 10, 2016: ACS Applied Materials & Interfaces
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