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Nanoscale

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https://www.readbyqxmd.com/read/28092389/a-new-method-for-developing-defect-rich-graphene-nanoribbons-onion-like-carbon-co-nanoparticles-hybrid-materials-as-an-excellent-catalyst-for-oxygen-reactions
#1
Wenxiu Yang, Lulu Chen, Xiangjian Liu, Jianbo Jia, Shaojun Guo
Herein, a novel material with an excellent electrocatalytic activity for the oxygen reduction reaction (ORR), composed of onion-like carbon@Co nanoparticles (NPs) incorporated on defect-rich N-doped graphene nanoribbons (C@Co-NGR), is prepared via a combination of nitric acid etching and subsequent high-temperature treatment of the as-synthesized C@Co-N doped carbon nanotubes. The as-prepared C@Co-NGR exhibits excellent electrocatalytic activity for the ORR in 0.10 M KOH with a half-wave potential of 0.830 V (vs...
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28091668/effect-of-ammonia-on-chemical-vapour-deposition-and-carbon-nanotube-nucleation-mechanisms
#2
Clothilde A Eveleens, Alister J Page
Chemical vapour deposition (CVD) growth of carbon nanotubes is currently the most viable method for commercial-scale nanotube production. However, controlling the 'chirality', or helicity, of carbon nanotubes during CVD growth remains a challenge. Recent studies have shown that adding chemical 'etchants', such as ammonia and water, to the feedstock gas can alter the diameter and chirality of nanotubes produced with CVD. To date, this strategy for chirality control remains sub-optimal, since we have a poor understanding of how these etchants change the CVD and nucleation mechanisms...
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28091664/broadband-terahertz-modulation-in-electrostatically-doped-artificial-trilayer-graphene
#3
Ioannis Chatzakis, Zhen Li, Alexander V Benderskii, Stephen B Cronin
We report a terahertz optical modulator consisting of randomly stacked trilayer graphene (TLG) deposited on an oxidized silicon substrate by means of THz-Time Domain Spectroscopy (THz-TDS). Here, the gate tuning of the Fermi level of the TLG provides the fundamental basis for the modulation of THz transmission. We measured a 15% change in the THz transmission of this device over a broad frequency range (0.6-1.6 THz). We also observed a strong absorption >80% in the time-domain signals and a frequency independence of the conductivity...
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28090611/performance-of-nano-assembly-logic-gates-with-a-dna-multi-hairpin-motif
#4
Lulu Zhang, Annie M Bluhm, Kuan-Jen Chen, Nicholas E Larkey, Sean M Burrows
DNA nano-assemblies have far-reaching implications for molecular computers. Boolean logic gates made from DNA respond to specific combinations of chemical or molecular inputs. In complex samples an assortment of other chemicals and molecules may interfere with the gate's recognition and response mechanisms. For logic gates to accept an increasing number of inputs, while maintaining selectivity, their design must only respond when specific input combinations are available simultaneously. Here we present proof-of-principle for a fluorescent-based nano-assembly logic gate for three inputs...
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28090610/highly-dispersible-edge-selectively-oxidized-graphene-with-improved-electrical-performance
#5
Jisoo Park, Yern Seung Kim, Sae Jin Sung, Taehoon Kim, Chong Rae Park
We prepared liquid phase exfoliated edge-selectively oxidized graphene (LPEOG) with a high concentration in water (∼14.7 mg ml(-1)) and a high ratio of a single layer (70%). The edge of graphite was selectively oxidized by step II oxidation of the modified Hummers method, and we subsequently exfoliated the edge-selectively oxidized graphite (EOG) into LPEOG. The edge selective oxidation of the LPEOG was confirmed by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), zeta-potentiometry, Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and transmission electron microscopy (TEM)...
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28090609/a-composite-generator-film-impregnated-with-cellulose-nanocrystals-for-enhanced-triboelectric-performance
#6
Jun Peng, Huilong Zhang, Qifeng Zheng, Craig M Clemons, Ronald C Sabo, Shaoqin Gong, Zhenqiang Ma, Lih-Sheng Turng
A novel polydimethylsiloxane (PDMS)/cellulose nanocrystal flake (CNCF) composite triboelectric nanogenerator (CTG) using CNCFs as effective dielectrics exhibited a 10-times-enhanced triboelectric performance compared with its pure PDMS counterpart. Positive charges generated on the surface of the CNCFs during cyclic compression boosted electron transfer and induced extra charges. The CTG exhibited an instantaneous output power (density) of 1.65 mW (0.76 mW cm(-2)) under continuous operation.
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28085167/correction-tuneable-light-emitting-carbon-dot-polymer-flexible-films-prepared-through-one-pot-synthesis
#7
Susanta Kumar Bhunia, Sukhendu Nandi, Joydeb Manna, Rafi Shikler, Raz Jelinek
Correction for 'Tuneable light-emitting carbon-dot/polymer flexible films prepared through one-pot synthesis' by Susanta Kumar Bhunia, et al., Nanoscale, 2016, 8, 3400-3406.
January 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28084489/renewable-emodin-based-wearable-supercapacitors
#8
Pengfei Hu, Tinghan Chen, Yun Yang, Hua Wang, Zihao Luo, Jie Yang, Haoran Fu, Lin Guo
With the increasing dependency of human life on wearable electronics, the development of corresponding energy-storage devices is being insensitively pursued. Considering the special usage locations of wearable energy-storage devices, the safety and non-toxicity of electrode materials adopted should be of concern. In this work, a novel all-solid-state wearable supercapacitor based on the renewable-biomolecule emodin, naturally derivable from traditional Chinese herbal rhubarb or Polygonum cuspidatum, was successfully fabricated...
January 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28084486/selective-sensing-of-ethylene-and-glucose-using-carbon-nanotube-based-sensors-an-ab-initio-investigation
#9
Yan Li, Miroslav Hodak, Wenchang Lu, J Bernholc
Functionalized carbon nanotubes have great potential for nanoscale sensing applications, yet many aspects of their sensing mechanisms are not understood. Here, two paradigmatic sensor configurations for detection of biologically important molecules are investigated through ab initio calculations: a non-covalently functionalized nanotube for glucose detection and a covalently functionalized nanotube for ethylene detection. Glucose and ethylene control key life processes of humans and plants, respectively, despite of their structural and chemical simplicity...
January 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28084482/programmed-dissociation-of-dimer-and-trimer-origami-structures-by-aptamer-ligand-complexes
#10
Na Wu, Itamar Willner
Dimer- and trimer-origami frames are bridged by duplexes that include caged, sequence-specific, anti-ATP and/or anti-cocaine aptamer sequences. The programmed dissociation of the origami dimers or trimers in the presence of ATP and/or cocaine ligands is demonstrated. The processes are followed by AFM imaging and by electrophoretic experiments.
January 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28084478/phase-angle-encoded-upconversion-luminescent-nanocrystals-for-multiplexing-applications
#11
Haichun Liu, Muthu K G Jayakumar, Kai Huang, Zi Wang, Xiang Zheng, Hans Ågren, Yong Zhang
Lanthanide-doped upconversion nanoparticles (UCNPs) are increasingly used as luminescent candidates in multiplexing applications due to their excellent optical properties. In the past, several encoding identities have been proposed for UCNPs, including emission colour, intensity ratio between different emission bands, colour spatial distribution, and luminescence lifetime. In this paper, a new optical encoding dimension for upconversion nanomaterials is developed by exploring their luminescence kinetics, i...
January 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28084477/pick-up-move-and-release-of-nanoparticles-utilizing-co-non-solvency-of-pnipam-brushes
#12
Yunlong Yu, Ricardo A Lopez de la Cruz, Bernard D Kieviet, Hubert Gojzewski, Adeline Pons, G Julius Vancso, Sissi de Beer
A critical complication in handling nanoparticles is the formation of large aggregates when particles are dried e.g. when they need to be transferred from one liquid to another. The particles in these aggregates need to disperse into the destined liquid medium, which has been proven difficult due to the relatively large interfacial interaction forces between nanoparticles. We present a simple method to capture, move and release nanoparticles without the formation of large aggregates. To do so, we employ the co-non-solvency effect of poly(N-isopropylacrylamide) (PNIPAM) brushes in water-ethanol mixtures...
January 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28078339/simultaneous-topographical-electrical-and-optical-microscopy-of-optoelectronic-devices-at-the-nanoscale
#13
Naresh Kumar, Alina Zoladek-Lemanczyk, Anne A Y Guilbert, Weitao Su, Sachetan M Tuladhar, Thomas Kirchartz, Bob C Schroeder, Iain McCulloch, Jenny Nelson, Debdulal Roy, Fernando A Castro
Novel optoelectronic devices rely on complex nanomaterial systems where the nanoscale morphology and local chemical composition are critical to performance. However, the lack of analytical techniques that can directly probe these structure-property relationships at the nanoscale presents a major obstacle to device development. In this work, we present a novel method for non-destructive, simultaneous mapping of the morphology, chemical composition and photoelectrical properties with <20 nm spatial resolution by combining plasmonic optical signal enhancement with electrical-mode scanning probe microscopy...
January 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28074964/how-the-alignment-of-adsorbed-ortho-h-pairs-determines-the-onset-of-selective-carbon-nanotube-etching
#14
U Khalilov, A Bogaerts, B Xu, T Kato, T Kaneko, E C Neyts
Unlocking the enormous technological potential of carbon nanotubes strongly depends on our ability to specifically produce metallic or semiconducting tubes. While selective etching of both has already been demonstrated, the underlying reasons, however, remain elusive as yet. We here present computational and experimental evidence on the operative mechanisms at the atomic scale. We demonstrate that during the adsorption of H atoms and their coalescence, the adsorbed ortho hydrogen pairs on single-walled carbon nanotubes induce higher shear stresses than axial stresses, leading to the elongation of HC-CH bonds as a function of their alignment with the tube chirality vector, which we denote as the γ-angle...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28074963/ultrahigh-capacity-dynamic-holographic-displays-via-anisotropic-nanoholes
#15
Xiaohu Zhang, Jinjin Jin, Mingbo Pu, Xiong Li, Xiaoliang Ma, Ping Gao, Zeyu Zhao, Yanqin Wang, Changtao Wang, Xiangang Luo
For the miniaturization of optical holographic and data recording devices, large information capacity or data density is indispensable but difficult to obtain using traditional technologies. In this paper, an ultrahigh-capacity metasurface hologram is proposed by encoding information in deep-subwavelength scale nanohole arrays, which can be reconstructed via a light beam with proper designed incident angles. The imaging information capacity of the two-dimensional (2D) hologram, defined by the distortion-free region, can be increased 11...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28074961/tunable-electrical-properties-of-multilayer-hfse2-field-effect-transistors-by-oxygen-plasma-treatment
#16
Moonshik Kang, Servin Rathi, Inyeal Lee, Lijun Li, Muhammad Atif Khan, Dongsuk Lim, Yoontae Lee, Jinwoo Park, Sun Jin Yun, Doo-Hyeb Youn, Chungsam Jun, Gil-Ho Kim
HfSe2 field effect transistors are systematically studied in order to selectively tune their electrical properties by optimizing layer thickness and oxygen plasma treatment. The optimized plasma-treated HfSe2 field effect transistors showed a high on/off ratio improvement of four orders of magnitude, from 27 to 10(5), a field effect mobility increase from 2.16 to 3.04 cm(2) V(-1) s(-1), a subthreshold swing improvement from 30.6 to 4.8 V dec(-1), and a positive threshold voltage shift between depletion mode and enhancement mode, from -7...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28074960/search-for-effective-chemical-quenching-to-arrest-molecular-assembly-and-directly-monitor-dna-nanostructure-formation
#17
J M Majikes, J A Nash, T H LaBean
Structural DNA nanotechnology has demonstrated both versatility and potential as a molecular manufacturing tool; the formation and processing of DNA nanostructures has therefore been subject to much interest. Characterization of the formation process itself is vital to understanding the role of design in production yield. We present our search for a robust new technique, chemical quenching, to arrest molecular folding in DNA systems for subsequent characterization. Toward this end we will introduce two miniM13 origami designs based on a 2...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28074959/partial-hydrogenation-induced-interaction-in-a-graphene-sio2-interface-irreversible-modulation-of-device-characteristics
#18
Takuya Iwasaki, Manoharan Muruganathan, Marek E Schmidt, Hiroshi Mizuta
The transformation of systematic vacuum and hydrogen annealing effects in graphene devices on the SiO2 surface is reported based on experimental and van der Waals interaction corrected density functional theory (DFT) simulation results. Vacuum annealing removes p-type dopants and reduces charged impurity scattering in graphene. Moreover, it induces n-type doping into graphene, leading to the improvement of the electron mobility and conductivity in the electron transport regime, which are reversed by exposing to atmospheric environment...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28074957/high-efficiency-perovskite-solar-cells-prepared-by-using-a-sandwich-structure-mai-pbi2-mai-precursor-film
#19
Xuhui Zhang, Jiajiu Ye, Liangzheng Zhu, Haiying Zheng, Guozhen Liu, Xuepeng Liu, Bin Duan, Xu Pan, Songyuan Dai
Two-step deposition has been widely used in the perovskite layer preparation for perovskite solar cells due to its attractive morphology controllability. However, the limited diffusivity of CH3NH3I (MAI) might cause some PbI2 to remain in the perovskite film. The residual PbI2 in the perovskite film would lead to inferior performance of devices, such as, low power conversion efficiency (PCE), poor reproducibility and weak air stability. In this work, we developed a sandwich structure MAI-PbI2-MAI precursor film to prepare a PbI2-free CH3NH3PbI3 perovskite film...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28074956/tunable-superapolar-lotus-to-rose-hierarchical-nanosurfaces-via-vertical-carbon-nanotubes-driven-electrohydrodynamic-lithography
#20
Chiara Busà, Jonathan James Stanley Rickard, Eugene Chun, Yaw Chong, Viroshan Navaratnam, Pola Goldberg Oppenheimer
The development of a robust, cost-effective, scalable and simple technique that enables the design and construction of well-controlled large area superhydrophobic surface structures which can be easily tuned from lotus-leaf to rose-petal state is essential to enable progress in realising the full applied potential of such surfaces. In this study, we introduce the tuneable carbon nanotubes-based electrohydrodynamic lithography (CNT-EHL) to fabricate unique multiscale structured cones and nanohair-like architectures with various periodicities and dimensions, successfully enabling surface energy minimization...
January 11, 2017: Nanoscale
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