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Nanotechnology

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https://www.readbyqxmd.com/read/29775440/crystalline-multiwall-carbon-nanotube-and-its-application-as-field-emission-electron-source
#1
Peng Liu, Duanliang Zhou, Chunhai Zhang, Haoming Wei, Xinhe Yang, Yang Wu, Qingwei Li, Changhong Liu, Bingchu Du, Liang Liu, Kaili Jiang, Shoushan Fan
With the super aligned carbon nanotube (SACNT) film, we have fabricated crystalline multiwall CNT (MWCNT) by adopting a high pressure and high temperature processing. The CNTs keep parallel to each other and distributed uniformly. XRD characterization shows peaks at small angle range, which can be assigned to the spacing of MWCNT crystal. The mechanical, electrical and thermal properties are all greatly improved compared with the original CNT film. The field emission properties of crystalline MWCNT are tested and it shows a better surface morphology stability at large emission current...
May 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29775439/facile-synthesis-of-sb2s3-mos2-heterostructure-as-anode-material-for-sodium-ion-batteries
#2
Zhendong Zhang, Jiachang Zhao, Meilan Xu, Hongxia Wang, Yanmei Gong, Jingli Xu
A novel Sb2S3/MoS2 heterostructure in which Sb2S3 nanorods are coated with MoS2 nanosheets to form core-shell structure has been fabricated via a facile two-step hydrothermal process. The Sb2S3/MoS2 heterostructure utilized as anode of sodium-ion batteries (SIBs) shows higher capacity, superior rate capability and better cycling performance compared with individual Sb2S3 nanorods and MoS2 nanosheets. Specifically, the Sb2S3/MoS2 electrode shows an initial reversible capacity of 701 mAh g-1 at the current density of 100 mA g-1, which is remained 80...
May 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29775438/breakdown-of-water-super-permeation-in-electrically-insulating-graphene-oxide-films-role-of-dual-interlayer-spacing
#3
M K Kavitha, Tushar Sakorikar, Pramitha V, Manu Jaiswal
Conventional graphene oxide is characterized by low sp<sup>2</sup> content in a sp<sup>3</sup> rich matrix, which is responsible both for electrical insulation and water super-permeation. Upon reduction, electrical conduction is achieved at the expense of water permeation ability. Here, we demonstrate that charge conduction and water permeation can be simultaneously restricted in a functionalized form of graphene oxide. Gravimetric studies reveal that diffusion of water vapour through glassy polymer membranes is arrested by loading hydrophobic form of GO in the polymer matrix, even as such water inhibition cannot be realized by substantially increasing the thickness of the bare polymer...
May 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29771682/graphene-nanoplatelet-composite-paper-as-an-electrostatic-actuator
#4
Zeyang Yu, Lawrence Drzal
Graphene nanoplatelets (GnP) can be made into a thin 'paper' through vacuum filtration of GnP suspension. Electrodes were fabricated from the compressed GnP paper and then coating the surface with epoxy. The electrostatic actuator was constructed from two parallel-aligned composite papers fixed at the anode and a cathode connected to the ground. The two composite papers will separate when applying voltage. The GnP paper was further treated by making the porous GnP paper; adding 10wt% Cellulose nanocrystals or C750 (GnP with diameter around 1μm), or coated with barium titanate particles...
May 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29771681/selective-adsorption-of-oppositely-charged-pnipaam-on-halloysite-surfaces-a-route-to-thermo-responsive-nanocarriers
#5
Giuseppe Cavallaro, Giuseppe Lazzara, Lorenzo Lisuzzo, Stefana Milioto, Filippo Parisi
Halloysite nanotubes were functionalized with stimuli-responsive macromolecules to generate smart nanohybrids. Poly(N-isopropylacrylamide)-co-methacrylic acid (PNIPAAM-co-MA) was selectively adsorbed into halloysite lumen by exploiting electrostatic interactions. Amine-terminated PNIPAAM polymer was also investigated that selectively interacts with the outer surface of the nanotubes. The adsorption site has a profound effect on the thermodynamic behavior and therefore temperature responsive features of the hybrid material...
May 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29770776/in-situ-transmission-electron-microscopy-of-transistor-operation-and-failure
#6
Baoming Wang, M Zahabul Islam, M Aman Haque, Kelson Chabak, Michael Snure, Eric Heller, Nicholas Robert Glavin
Microscopy is typically used as a post-mortem analytical tool in performance and reliability studies on nanoscale materials and devices. In this study, we demonstrate real-time microscopy of operation and failure of AlGaN/GaN high electron mobility transistors inside the transmission electron microscope (TEM). Loading till failure was performed on the electron transparent transistors to visualize the failure mechanisms caused by self heating. At lower drain voltages, thermo-mechanical stresses induce irreversible microstructural deformation, mostly along the AlGaN/GaN interface, to initiate the damage process...
May 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29770775/mechanism-of-axial-strain-effects-on-friction-in-carbon-nanotube-rotating-bearings
#7
Jianzhang Huang, Qiang Han
Systematical study of axial strain effects on friction in carbon nanotube bearings are conducted in this paper. The relationships between friction and axial strains are determined by implementing the molecular dynamics simulations. It is found that the dependences of friction on velocity and temperature are altered by the axial strains. The mechanism of strain effects is revealed through numerical and theoretical analysis. Based on the phonon computations, it shows that the axial strain effects tune the friction by adjusting the distribution of phonon frequency density, which affects the transfer efficiency of orderly kinetic energy into disorderly thermal energy...
May 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29770773/highly-ordered-molecular-rotor-matrix-on-a-nanopatterned-template-titanyl-phthalocyanine-molecules-on-feo-pt-111
#8
Shuangzan Lu, Min Huang, Zhihui Qin, Yinghui Yu, Qinmin Guo, Gengyu Cao
Molecular rotors, motors and gears plays important roles in artificial molecular machines, in which rotor and motor matrices are much desirable for large scale bottom-up fabrication of molecular machines. Here we demonstrate the fabrication of a highly ordered molecular rotor matrix by depositing nonplanar dipolar titanyl phthalocyanine (TiOPc, C<sub>32</sub>H<sub>16</sub>N<sub>8</sub>OTi) molecules on Moiré patterned dipolar FeO/Pt(111) substrate...
May 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29767633/nanopatterning-on-calixarene-thin-films-via-low-energy-field-emission-scanning-probe-lithography
#9
Xiaoyue He, Peng Li, Pengchong Liu, Xiaoxian Zhang, Xiangqian Zhou, Wei Liu, Xiaohui Qiu
Field-emitted, low-energy electrons from the conducting tip of an atomic force microscope were adopted for nanolithography on calixarene ultrathin films coated on silicon wafers. A structural evolution from protrusion to depression down to a 30 nm spatial resolution was reproducibly obtained by tuning the sample voltage and exposure current in the lithography process. Close analyses of the profiles showed that the nanostructures formed by a single exposure with a high current are almost identical to those created by cumulative exposure with a lower current but an equal number of injected electrons...
May 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29767629/amplitude-and-phase-modulation-in-microwave-ring-resonators-by-doped-cvd-graphene
#10
Marco Grande, Giuseppe Valerio Bianco, Pio Capezzuto, Vincenzo Petruzzelli, Francesco Prudenzano, Michael Scalora, Giovanni Bruno, Antonella D'Orazio
In this paper, we numerically and experimentally demonstrate how to modulate the amplitude and phase of a microwave ring resonator by means of few-layers Chemical Vapour Deposition (CVD) graphene. In particular, both numerical and experimental results show a modulation of about 10 dB and a 90 degrees-shift (quadrature phase shift) when the graphene sheet-resistance is varied. These findings prove once again that graphene could be efficiently exploited for the dynamically tuning and modulation of microwave devices fostering the realization of (i) innovative beam-steering and beam-forming systems and (ii) graphene-based sensors...
May 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29763412/thermoacoustic-sound-projector-exceeding-the-fundamental-efficiency-of-carbon-nanotubes
#11
Ali E Aliev, Daniel Codoluto, Ray H Baughman, Raquel Ovalle-Robles, Kanzan Inoue, Stepan A Romanov, Albert Nasibulin, Prashant Kumar, Shashank Priya, Nathanael K Mayo, John Blottman
The combination of smooth, continuous sound spectra produced by a sound source having no vibrating parts, a nanoscale thickness of a flexible active layer and the feasibility of creating large, conformal projectors provoke interest in thermoacoustic phenomena. However, at low frequencies, the sound pressure level and the sound generation efficiency of open carbon nanotube sheets (CNTS) is low. In addition, the nanoscale thickness of fragile heating elements, their high sensitivity to the environment and the high surface temperatures practical for thermoacoustic sound generation necessitate a protective encapsulation of freestanding CNTS in inert gases...
May 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29762138/theranostic-gold-magnetite-hybrid-nanoparticles-for-mri-guided-radiosensitization
#12
Devid Maniglio, Filippo Benetti, Luca Minati, Jorge Jovicich, Aldo Valentini, G Speranza, Claudio Migliaresi
The main limitation of drug-enhanced radiotherapy concerns the difficulty to evaluate the effectiveness of cancer targeting after drug administration hindering the standardization of therapies based on current radiosensitizing compounds. The challenge regards the development of systems able to combine imaging and radiotherapy enhancement in order to perform highly reliable cancer theragnosis. For these reasons, gold-magnetite hybrid nanoparticles are proposed as innovative theranostic nanotools for imaging-guided radiosensitization in cancer treatment...
May 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29761791/selective-synthesis-of-turbostratic-polyhedral-carbon-nano-onions-by-arc-discharge-in-water
#13
Francesca Alessandro, Andrea Scarcello, Marlon Danilo Basantes Valverde, Diana Coello-Fiallos, Salih Mohamed Osman, Anna Cupolillo, Melvin Arias, Olimpia Arias de Fuentes, Giorgio De Luca, Alfredo Aloise, Efrem Curcio, Giuseppe Nicotra, Corrado Spinella, Lorenzo S Caputi
Carbon nano-onions (CNOs), in their spherical or polyhedral forms, represent an important class of nanomaterials, due to their peculiar physical and electrochemical properties. Among the different methods of production, arc discharge between graphite electrodes sustained by deionized water is one of the most promising to obtain good quality CNOs in gram quantities. We applied the method with the aim to optimize the production of CNOs, using an innovative experimental arrangement. The discharges generate dispersed nanomaterials and a black hard cathodic deposit, which were studied by TEM, Raman and TGA...
May 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29761790/contact-resistance-reduction-of-zno-thin-film-transistors-tfts-with-saw-shaped-electrode
#14
Woojin Park, Sohail Faizan Shaikh, Jungwook Min, Sang Kyung Lee, Byoung Hun Lee, Muhammad Mustafa Hussain
We report a saw-shaped electrode architecture ZnO thin film transistor (TFT) for effectively increase channel width. Such a saw-shaped electrode has ~2 times longer contact line at the contact metal/ZnO channel junction. We experimentally observed an enhancement in the output drive current by 50% and reduction in the contact resistance by over 50%, when compared to a typical shaped electrode ZnO TFT consuming the same chip area. This performance enhancement is attributed to extension of channel width. This technique can contribute to device performance enhancement and especially reduction in the contact resistance which is a serious challenge...
May 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29761789/ph-and-redox-responsive-nanoparticles-composed-of-charge-reversible-pullulan-based-shells-and-disulfide-containing-poly-%C3%AE-amino-ester-cores-for-co-delivery-of-gene-and-chemotherapeutic-agent
#15
Sipei Zhang, Dan Wang, Yating Li, Ling Li, Hongli Chen, Qingqing Xiong, Yuan-Yuan Liu, Yingsong Wang
A novel pH- and redox-responsive nanoparticle system was designed based on charge-reversible pullulan derivative (CAPL) and disulfide-containing poly(β-amino ester) (ssPBAE) for the co-delivery of gene and chemotherapeutic agent targeting hepatoma. The end-alkene groups of ssPBAE were reacted with diethylenetriamine to form amino-modified ssPBAE (NH-ssPBAE). Methotrexate (MTX), a chemotherapy agent, was then conjugated to NH-ssPBAE via amide bond to obtain a polymeric prodrug ssPBAE-MTX. ssPBAE-MTX exhibited a good capability for condensing genes including plasmid DNA (pDNA) and tetramethyl rhodamine-labeled DNA (TAMRA-DNA), and almost completely condensed pDNA at the weight ratio of 5/1 to form spherical nanocomplexes with an uniform size...
May 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29757753/unified-mechanism-of-the-surface-fermi-level-pinning-in-iii-as-nanowires
#16
Prokhor A Alekseev, Mikhail S Dunaevskiy, George E Cirlin, Rodion Reznik, Alexander Smirnov, Demid Kirilenko, Valery Davydov, Vladimir L Berkovits
Fermi level pinning at the oxidized (110) surfaces of III-As nanowires (GaAs, InAs, InGaAs, AlGaAs) is studied. Using scanning gradient Kelvin probe microscopy, we show that the Fermi level at oxidized cleavage surfaces of ternary Al<sub>x</sub>Ga<sub>1-x</sub>As (0≤x≤0.45) and Ga<sub>x</sub>In<sub>1-x</sub>As (0≤x≤1) alloys is pinned at the same position of 4.8 ± 0.1 eV with regard to the vacuum level...
May 14, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29757752/high-speed-chalcogenide-glass-electrochemical-metallization-cells-with-various-active-metals
#17
Mark Anthony Hughes, Alexander Burgess, Steven Hinder, Abdolbaset Gholizadeh, Christopher Craig, Daniel W Hewak
We fabricated electrochemical metallization (ECM) cells using a GaLaSO solid electrolyte, a InSnO inactive electrode and active electrodes consisting of various metals (Cu, Ag, Fe, Cu, Mo, Al). Devices with Ag and Cu active metals showed consistent and repeatable resistive switching behaviour, and had a retention of 3 and >43 days, respectively; both had switching speeds of < 5 ns. Devices with Cr and Fe active metals displayed incomplete or intermittent resistive switching, and devices with Mo and Al active electrodes displayed no resistive switching ability...
May 14, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29757167/understanding-photoluminescence-of-metal-nanostructure-based-on-oscillator-model
#18
Yuqing Cheng, Weidong Zhang, Jingyi Zhao, Te Wen, Aiqin Hu, Qihuang Gong, Guowei Lu
Scattering and absorption properties of metal nanostructures have been understood well based on classic oscillator theory. Here, we demonstrate that photoluminescence of metal nanostructures can also be explained based on classic model. The model shows that inelastic radiation of an oscillator resembles its resonance band after external excitation, that is related with the photoluminescence from metallic nanostructures. The understanding based on classic oscillator model is in agreement with that predicted by quantum electromagnetic cavity model...
May 14, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29757164/real-time-observation-of-slipping-and-rolling-events-in-dlc-wear-nanoparticles
#19
Takaaki Sato, Shinsuke Nabeya, Menon Vivek, Tadashi Ishida, Reo Kometani, Hiroyuki Fujita
Real-time observation of the actual contact area between surface interfaces at the nanoscale enables more precise examination of what happens during friction. We have combined MEMS (Micro Electro Mechanical System) actuators and TEM observation to both apply and measure forces across nanoscale junctions and contacts. This custom-designed experimental system can measure the true surface area of a contact site from a lateral viewpoint while simultaneously measuring the friction force. We scratched surfaces coated with DLC, a classical solid lubricant, and observed the formation of wear particles that slipped and rolled between the interface...
May 14, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29757163/novel-secondary-assembled-micro-nano-porous-spheres-znco2o4-with-superior-electrochemical-performances-as-lithium-ions-anode-material
#20
Haowen Liu, Qihong Hu
In this work, novel secondary assembled micro/nano porous spheres ZnCo2O4 have been firstly prepared by combining hydrothermal method with post-synthesis calcinations. The structure and morphology of the obtained powder were characterized by X-ray powder diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM). As anode material of lithium-ion half cells, the as-prepared ZnCo2O4 delivered a very high capacity, extra cycling stability and excellent rate capability. A discharge capacity of 950 mAh g-1 with up to 99...
May 14, 2018: Nanotechnology
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