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Nanotechnology

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https://www.readbyqxmd.com/read/30024387/ferroelectric-monoclinic-phases-in-strained-k0-70na0-30nbo3-thin-films-promoting-selective-surface-acoustic-wave-propagation
#1
Leonard von Helden, Martin Schmidbauer, Sijia Liang, Michael Hanke, Roger Wordenweber, Jutta Schwarzkopf
We present a detailed analysis of the ferroelectric domain structure of K0.70Na0.30NbO3 thin films on (110) TbScO3 grown by metal organic chemical vapor deposition. Upon piezoresponse force microscopy and nanofocus X-ray diffraction measurements we derive a domain model revealing monoclinic MC domains. The complex domain pattern is formed out of four co-existing in-plane orientations of the shearing direction of the monoclinic unit cell resulting in four types of superdomains each being composed of well-ordered stripe domains...
July 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30020085/top-down-and-sensitive-indium-oxide-nanoribbon-field-effect-transistor-biosensor-chips-integrated-with-on-chip-gate-electrodes-toward-point-of-care-applications
#2
Noppadol Aroonyadet, Wutthinan Jeamsaksiri, Anurat Wisitsoraat, Adisorn Tuantranont
We report a scalable, uniform, and sensitive top-down fabricated indium oxide (In<sub>2</sub>O<sub>3</sub>) nanoribbon biosensor platform with integrated on-chip gate electrodes using two photolithographic masks. The purpose of this on-chip gate electrode is to control the operational point of the sensor during biomolecular detection replacing the cumbersome external Ag/AgCl electrode. It exhibits excellent capability in gating transistors in an aqueous condition and high stability during the sensing experiment, which is similar to the Ag/AgCl electrode...
July 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30020084/aggregation-of-nanoparticles-regulated-by-mechanical-properties-of-nanoparticles-membrane-system
#3
Huayuan Tang, Hongfei Ye, Hong Wu Zhang, Yonggang Zheng
Aggregation of nanoparticles (NPs) on the cell membrane is crucial for the cellular uptake process and has important biological implications in the proteins-membrane interactions. In this paper, we systematically investigate how the aggregation is regulated by the mechanical properties of the NPs-membrane system, including the membrane tension, the sizes and shapes of the NPs. Results show that when NPs aggregate parallel on the cell membrane, increasing the membrane tension will modulate the membrane-mediated interaction between the NPs from attractive to attractive-repulsive and finally to purely repulsive...
July 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30020078/nanoscale-potential-fluctuations-in-nonstoichiometrics-tantalum-oxide
#4
Vladimir A Gritsenko, Vladimir A Volodin, Timofey T V Perevalov, Vladimir N Kruchinin, Alina Gerasimova, Vladimir Aliev, Igor' P Prosvirin
Atomic and electronic structure of nonstoichiometric amorphous tantalum oxide (TaOx) films of different composition has been investigated by means of electron microscopy, X-ray photoelectron spectroscopy, Raman and Infrared spectroscopy. The dispersion of absorption coefficient and refraction index has been studied by spectral ellipsometry. The optical spectra were interpreted using the results of quantum-chemical simulation for crystalline orthorhombic tantalum oxide. It was found that the presence of oxygen vacancies in oxygen-deficient TaOx film that show the optical absorption peak at 4...
July 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30015628/self-powered-wearable-sensing-textiles-for-real-time-detecting-environmental-atmosphere-and-body-motion-based-on-surface-triboelectric-coupling-effect
#5
Tianming Zhao, Junlang Li, Hui Zeng, Yongming Fu, Haoxuan He, Lili Xing, Yan Zhang, Xinyu Xue
Self-powered wearable sensing-textiles for real-time detecting environmental atmosphere and body motion have been presented. The textile is based on highly-stretchable conductive ecoflex fiber modified with multiwall carbon nanotube (MWCNT) and polyaniline (PANI) derivatives (acting as one electrode). The surface of the fiber is twined with varnished wire (acting as the other electrode). Upon applied deformation of stretching or bending, the sensing-textile can harvest the mechanical energy and output electric signals through the triboelectrification effect between PANI and varnished wire...
July 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30015624/three-dimensional-microporous-graphene-decorated-with-lithium
#6
Marco Iacobucci, Iolanda Di Bernardo, Meganne Christian, Vittorio Morandi, Francesca Ripanti, Paolo Postorino, Carlo Mariani, Maria Grazia Betti
Three-dimensional (3D) graphene based architectures can combine the two-dimensional properties of graphene with the high surface-to-volume ratio required for a large variety of technological applications. We present a spectro-microscopy study of stable micro-porous 3D few-layer graphene structures with a very low density of defects/edges and of unsaturated bonds, as deduced by Raman and core level photoemission spectroscopy. These qualities make these interconnected graphene networks ideal candidates to accommodate lithium adatoms, with a high density of Li per unit volume and a Li uptake per C atom higher than the value observed for graphite, as confirmed by core level photoemission spectroscopy...
July 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30015623/enhanced-photocatalytic-oxygen-evolution-activity-by-formation-of-ir-irox-oh-y-core-shell-heterostructure
#7
Junnan Li, Ziwei Pan, Kebin Zhou
Developing efficient catalysts to accelerate the rate of oxygen evolution reaction (OER) is critical for photocatalytic water splitting. In this work, metallic Ir, IrOx(OH)y, and core-shell Ir@IrOx(OH)y were synthesized and employed as OER catalysts for photocatalytic water oxidation. It was found that the Ir@IrOx(OH)y core-shell heterostructure catalyst showed the best photocatalytic performance among these three catalysts, with the oxygen evolution rate as high as 59.63 mmol/(g h). Detailed investigations revealed that the excellent photocatalytic activity of Ir@IrOx(OH)y could be attributed to both the outstanding intrinsic activity of IrOx(OH)y shell and the efficient electron transfer between the photosensitizer and catalyst...
July 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30015332/influence-of-morphology-on-electrical-and-optical-properties-of-graphene-al-doped-zno-nanorod-composites
#8
Ebrahim Chalangar, Houssaine Machhadani, Seung-Hyuk Lim, Fredrik Karlsson, Omer Nur, Magnus Willander, Hakan Pettersson
The development of future 3D-printed electronics relies on the access to highly conductive inexpensive materials that are printable at low temperatures (100 <sup>○</sup>C).
 The implementation of available materials for these applications are however still limited by issues related to cost and printing quality. Here we report on simple hydrothermal growth of novel nanocomposites that are well suited for conductive printing applications. The nanocomposites comprise highly Al-doped ZnO nanorods grown on graphene nanoplatelets...
July 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30010616/large-scale-au-nanoparticle-cluster-arrays-with-tunable-particle-numbers-evolved-from-colloidal-lithography
#9
Liping Fang, Xueyao Liu, Siyuan Xiang, Wendong Liu, Huaizhong Shen, Zibo Li, Kai Zhang, Wei Song, Bai Yang
The assembly of metal nanoparticles (NPs) can regulate their plasmon resonance to pursue the best properties for applications. However, the controllable assembly of large-scale metal NP cluster arrays remains a significant challenge. This paper presents a novel strategy to prepare large-scale Au NP cluster arrays based on colloidal lithography and template-guided self-assembly technique. The NPs arrays are fabricated by introducing Au NPs onto the quaternized poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) brush templates via elec...
July 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30010614/metal-organic-framework-derived-cobalt-phosphosulfide-with-ultrahigh-microwave-absorption-properties
#10
Wenjun Ruan, Congpu Mu, Bochong Wang, Anmin Nie, Can Zhang, Xia Du, Jianyong Xiang, Fusheng Wen, Zhongyuan Liu
Nanostructure composites of ferromagnetic materials embedded into nanoporous carbon derived from metal-organic frameworks (MOFs) have attracted enormous attention due to their potential application in many fields, such as microwave absorption, energy storage and conversion. Rational design on nanocomposites holds determinant factor for overcoming the challenges involving the microwave absorption performance. Herein, CoS2/NC, CoP/NC and CoS2-xPx/NC with rhombic dodecahedral structure have been successfully fabricated by using the template cobalt based MOFs (ZIF-67)...
July 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30010093/composition-and-strain-relaxation-of-in-sub-x-sub-ga-sub-1-x-sub-n-graded-core-shell-nanorods
#11
Queenie Yoganandhi Soundararajah, Richard Francis Webster, Ian John Griffiths, Sergei V Novikov, Charles Thomas Foxon, David Cherns
Two In<sub>x</sub>Ga<sub>1-x</sub>N nanorod samples with graded In compositions of x=0.5-0 (Ga-rich) and x=0.5-1 (In-rich) grown by molecular beam epitaxy were studied using transmission electron microscopy. The nanorods had wurtzite crystal structure with growth along [0001] and core-shell structures with In-rich core and Ga-rich shell. Energy-dispersive X-ray analysis confirmed grading over the entire compositional range and showed that the axial growth rate was primarily determined by the In flux, and the radial growth rate by the Ga flux...
July 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30010091/atomic-layer-deposition-for-spacer-defined-double-patterning-of-sub-10-nm-titanium-dioxide-features
#12
Stefano Dallorto, Daniel Staaks, Adam Schwartzberg, XiaoMin Yang, Kim Lee, Ivo W Rangelow, Stefano Cabrini, Deirdre Olynick
The next generation of hard disk drive technology for data storage densities beyond 5 Tb/in<sup>2</sup> will require single-bit patterning of features with sub-10 nm dimensions by nanoimprint lithography. To address this challenge master templates are fabricated using pattern multiplication with atomic layer deposition. Sub-10 nm lithography requires a solid understanding of materials and their interactions. In this work we study two important oxide materials, silicon dioxide and titanium dioxide, as pattern spacer and look at their interaction to carbon, chromium and silicon dioxide...
July 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30010090/corrigendum-generation-and-stability-of-dynamical-skyrmions-and-droplet-solitons-2018-nanotechnology-29-325302
#13
Nahuel Statuto, Joan Manel Hernàndez Ferràs, A D Kent, Ferran Macia
We updated the labels of the Figure 3 corresponding to the initial angle of magnetization in degrees.
July 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30010087/plasmonic-color-filters-fabricated-via-oxide-based-nanotransfer-printing
#14
SoonHyoung Hwang, Myung-Ju Kim, Sohee Jeon, Bosung Shin, Jun-Ho Jeong
Plasmonic filters have recently become a topic of significant interest because they are suitable for a wide range of applications. However, effective fabrication of plasmonic filters remains a challenge. In this paper, we demonstrate a simple method for fabricating plasmonic color filters based on nanotransfer printing, using SiO2 as a hard mask for Al etching. Nanotransfer printing was performed on a 100 nm Al layer deposited on a glass wafer substrate with a 10 nm Al layer and a 20 nm SiO2 layer with a nanohole pattern...
July 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30004389/co3fe7-nitrogen-doped-graphene-nanoribbons-as-bi-functional-electrocatalyst-for-oxygen-reduction-and-oxygen-evolution
#15
Jaison M Joy, Sivamathini Rajappa, Vijayamohanan K Pillai, Subbiah Alwarappan
In this work, we report a one pot solvothermal strategy to synthesize Co3Fe7 incorporated graphene nanoribbons (Co3Fe7). An improved bi-functional electrocatalytic activity over the traditional electrocatalysts is exhibited by the Co3Fe7/NGNRs composite. For instance, this composite Co3Fe7/NGNRs depicted a lower overpotential of 350 mV than NGNRs (380 mV) and IrO2 (450 mV) to sustain 10 mA cm-2 for OER in 1.0 M KOH. Furthermore, during ORR, the catalyst exhibited a four-electron pathway and, it is interesting to note that its electrocatalytic behaviour is on par with commercial Pt/C...
July 13, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30004387/presetting-conductive-pathway-induced-the-switching-uniformity-evolution-of-a-sinx-h-resistive-switching-memory
#16
Yang Sun, Zhongyuan Ma, Xiaofan Jiang, Dingwen Tan, Hui Zhang, Xinxin Zhang, Jiang Liu, Huafeng Yang, Wei Li, Ling Xu, Kunji Chen, Duan Feng
Si-based resistive random access memory (RRAM) device at the nanoscale with high uniformity has great potential application in the future. We demonstrate that the uniformity evolution of the a-SiNx:H RRAM at the low resistance state (LRS) and the high resistance state (HRS) can be clearly monitored by presetting Si dangling bond conductive pathway through thermal energy. It is found that the increased magnitude of uniformity for the LRS and the HRS are determined by the number of the preset Si dangling bonds (Si-DBs), which can be controlled by tuning thermal energy...
July 13, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30004030/doxorubicin-gold-nanoparticles-coated-with-liposomes-for-chemo-photothermal-synergetic-antitumor-therapy
#17
Shanshan Xing, Xuwu Zhang, Liyao Luo, Weiwei Cao, Lei Li, Yuchu He, Jing An, Dawei Gao
Hybrid liposome/metal nanoparticles are promising candidate drug-carriers for therapy of various diseases due to their unique photothermal effect. In the study,self-crystallization of gold nanoparticles (Au NPs) and doxorubicin (DOX) were co-encapsulated within the liposomes (Au/DOX-Lips) by thin film hydration and gel sep-aration technology. The surface plasmon resonance bands of drug-carriers were controlla-ble in near-infrared (NIR) zone. When the complex liposome/metallic hybrids were irradi-ated by NIR light, they displayed higher endocytosis efficiency, following the fracture of liposomal membrane and the Au NPs releasing...
July 13, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30004029/suppression-of-magnetoresistance-in-ptse2-microflakes-with-antidot-arrays
#18
Zhaoguo Li, Yong Zeng, Minjie Zhou, Bo Xie, Jicheng Zhang, Weidong Wu
Suppression of magnetoresistance (MR) is meaningful for sensor applications to immure magnetic field. Herein, we report the observation of suppressed MR in PtSe2 microflakes by introducing the antidot arrays (AAs). We have compared the magnetotransport properties of PtSe2 microflakes before and after milling of AAs. The enhanced resistivity and notable MR suppression were observed while the AAs are milled in the PtSe2 microflakes. Their physical mechanism has been ascribed to the enhanced electron scattering rate due to the additional electron-antidot interactions...
July 13, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30004027/probing-the-mechanics-of-aqueous-two-phase-extraction-using-large-diameter-single-walled-carbon-nanotubes
#19
Edyta Turek, Tomasz Wasiak, Grzegorz Stando, Dawid Janas
We have demonstrated that large diameter (1.8±0.4 nm) carbon nanotubes (CNTs) can be separated by means of the aqueous two phase extraction (ATPE). This rapid and convenient tool has enabled us to isolate fractions of particular CNT diameter distribution. We have shown how a range of parameters can be used to fine tune the characteristics of the isolated material. What is very interesting, by varying the pH of the medium, we have suppressed the extraction of low diameter CNTs and only large diameter CNTs were obtained...
July 13, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30004026/bulk-scale-fabrication-of-sodium-tungsten-bronze-nanoparticles-for-applications-in-plasmonics
#20
Levi Tegg, Dylan Cuskelly, Vicki J Keast
In order to advance plasmon-based technologies, new materials with low damping losses and high chemical stability are needed. In this letter, we report the bulk scale fabrication of sodium tungsten bronze (Na<sub><i>x</i></sub>WO<sub>3</sub>) nanoparticles with high Na content (<i>x</i> ≤ 0.83) using a furnace-assisted method. Phase purity and morphology is confirmed with X-ray diffraction and scanning electron microscopy...
July 13, 2018: Nanotechnology
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