keyword
MENU ▼
Read by QxMD icon Read
search

Multilayer

keyword
https://www.readbyqxmd.com/read/29160684/improving-the-stability-of-high-performance-multilayer-mos2-field-effect-transistors
#1
Na Liu, Jongyeol Baek, Seung Min Kim, Seongin Hong, Young Ki Hong, Yang Soo Kim, Hyun-Suk Kim, Sunkook Kim, Jozeph Park
In this study, we propose a method for improving the stability of multilayer MoS2 field-effect transistors (FETs) by O2 plasma treatment and Al2O3 passivation sustaining high-performance characteristics of bulk MoS2 FET. The MoS2 FETs were exposed to O2 plasma for 30 s prior to Al2O3 encapsulation, showing a relatively small hysteresis and a high electrical performance. The MoOx layer formed during the plasma treatment was found between MoS2 and the top passivation layer. This MoOx interlayer prevents the generation of excess electron carriers in the channel due to Al2O3 passivation, minimizing the shift of threshold voltage (Vth) and increase of off-current leakage...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29160058/unraveled-face-dependent-effects-of-multi-layered-graphene-embedded-in-transparent-organic-light-emitting-diodes
#2
Jong Tae Lim, Jaesu Kim, Hyunkoo Lee, Jaehyun Moon, Byoung-Hwa Kwon, Seongdeok Ahn, Nam Sung Cho, Byung-Wook Ahn, Jeong-Ik Lee, Kyuwook Ihm, Seong Chu Lim
With increasing demand for transparent conducting electrode, graphene has attracted considerable attention, owing to its high electrical conductivity, high transmittance, low reflectance, flexibility and tunable work function. Two faces of single layer graphene are indistinguishable in its nature and this idea has not been doubted even in multilayered graphene (MLG) because it is difficult to separately characterize the front (first-born) and rear face (last-born) of MLG by using conventional analysis tools, such as Raman, ultraviolet spectroscopy, scanning probe microscopy, and sheet resistance...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29159512/cell-sheet-based-multilayered-liver-tumor-models-for-anti-cancer-drug-screening
#3
Jianing Yang, Shengjun Zhao, Yunfei Ji, Lili Zhao, Qingzhu Kong, Qing Zhang
OBJECTIVE: To fabricate in vitro cell-dense, three-dimensional (3D) tumor models by employing a cell sheet technology for testing anti-cancer drug efficacy. RESULTS: The stratified liver tumor models were fabricated by stacking contiguous HepG2 cell sheets. Triple-layer (3L), double-layer (2L), single-layer (1L) cell sheet-based liver tumor models (CSLTMs) demonstrated 106, 96, 85% cell viability, respectively, after 3 days treatment of 10 µM doxorubicin hydrochloride (DOX), while cell viability in two-dimensional (2D) conventional culture (control) was 27%...
November 20, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/29157218/brain-medical-image-diagnosis-based-on-corners-with-importance-values
#4
Linlin Gao, Haiwei Pan, Qing Li, Xiaoqin Xie, Zhiqiang Zhang, Jinming Han, Xiao Zhai
BACKGROUND: Brain disorders are one of the top causes of human death. Generally, neurologists analyze brain medical images for diagnosis. In the image analysis field, corners are one of the most important features, which makes corner detection and matching studies essential. However, existing corner detection studies do not consider the domain information of brain. This leads to many useless corners and the loss of significant information. Regarding corner matching, the uncertainty and structure of brain are not employed in existing methods...
November 21, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/29156881/mesoscale-graphene-like-honeycomb-mono-and-multi-layers-constructed-via-self-assembly-of-co-clusters
#5
Xue-Sen Hou, Guo-Long Zhu, Li-Jun Ren, Zihan Huang, Rui-Bin Zhang, Goran Ungar, Li-Tang Yan, Wei Wang
Honeycomb structure endows graphene with extraordinary properties. But could a honeycomb monolayer superlattice also be gen-erated via self-assembly of colloids or nanoparticles? Here we report the construction of mono- and multilayer molecular films with honeycomb structure that can be regarded as self-assembled artificial graphene (SAAG). We construct fan-shaped molecular building blocks by covalently connecting two kinds of clusters, one polyoxometalate (POM) and four polyhedral oligomeric silsesquioxanes (POSS)...
November 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29155388/polyelectrolyte-multilayers-for-bio-applications-recent-advancements
#6
REVIEW
Suman Pahal, Ruchi Gakhar, Ashok M Raichur, Manoj M Varma
The synergistic relationship between structure and the bulk properties of polyelectrolyte multilayer (PEM) films has generated tremendous interest in their application for loading and release of bioactive species. Layer-by-layer assembly is the simplest, cost effective process for fabrication of such PEMs films, leading to one of the most widely accepted platforms for incorporating biological molecules with nanometre precision. The bulk reservoir properties of PEM films render them a potential candidate for applications such as biosensing, drug delivery and tissue engineering...
December 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29154976/microneedle-arrays-coated-with-charge-reversal-ph-sensitive-copolymers-improve-antigen-presenting-cells-homing-dna-vaccine-delivery-and-immune-responses
#7
Huu Thuy Trang Duong, Nak Won Kim, Thavasyappan Thambi, V H Giang Phan, Min Sang Lee, Yue Yin, Ji Hoon Jeong, Doo Sung Lee
Successful delivery of a DNA vaccine to antigen-presenting cells and their subsequent stimulation of CD4(+) and CD8(+) T cell immunity remains an inefficient process. In general, the delivery of prophylactic vaccines is mainly mired by low transfection efficacy, poor immunogenicity, and safety issues from the materials employed. Currently, several strategies have been exploited to improve immunogenicity, but an effective strategy for safe and pain-free delivery of DNA vaccines is complicated. Herein, we report the rapid delivery of polyplex-based DNA vaccines using microneedle arrays coated with a polyelectrolyte multilayer assembly of charge reversal pH-responsive copolymer and heparin...
November 15, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29154225/matrix-completion-by-deep-matrix-factorization
#8
Jicong Fan, Jieyu Cheng
Conventional methods of matrix completion are linear methods that are not effective in handling data of nonlinear structures. Recently a few researchers attempted to incorporate nonlinear techniques into matrix completion but there still exists considerable limitations. In this paper, a novel method called deep matrix factorization (DMF) is proposed for nonlinear matrix completion. Different from conventional matrix completion methods that are based on linear latent variable models, DMF is on the basis of a nonlinear latent variable model...
November 3, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/29151573/mixing-instabilities-during-shearing-of-metals
#9
Mohsen Pouryazdan, Boris J P Kaus, Alexander Rack, Alexey Ershov, Horst Hahn
Severe plastic deformation of solids is relevant to many materials processing techniques as well as tribological events such as wear. It results in microstructural refinement, redistribution of phases, and ultimately even mixing. However, mostly due to inability to experimentally capture the dynamics of deformation, the underlying physical mechanisms remain elusive. Here, we introduce a strategy that reveals details of morphological evolution upon shearing up to ultrahigh strains. Our experiments on metallic multilayers find that mechanically stronger layers either fold in a quasi-regular manner and subsequently evolve into periodic vortices, or delaminate into finer layers before mixing takes place...
November 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/29150623/effective-mechanical-properties-of-multilayer-nano-heterostructures
#10
T Mukhopadhyay, A Mahata, S Adhikari, M Asle Zaeem
Two-dimensional and quasi-two-dimensional materials are important nanostructures because of their exciting electronic, optical, thermal, chemical and mechanical properties. However, a single-layer nanomaterial may not possess a particular property adequately, or multiple desired properties simultaneously. Recently a new trend has emerged to develop nano-heterostructures by assembling multiple monolayers of different nanostructures to achieve various tunable desired properties simultaneously. For example, transition metal dichalcogenides such as MoS2 show promising electronic and piezoelectric properties, but their low mechanical strength is a constraint for practical applications...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29150402/network-science-of-biological-systems-at-different-scales-a-review
#11
REVIEW
Marko Gosak, Rene Markovič, Jurij Dolenšek, Marjan Slak Rupnik, Marko Marhl, Andraž Stožer, Matjaž Perc
Network science is today established as a backbone for description of structure and function of various physical, chemical, biological, technological, and social systems. Here we review recent advances in the study of complex biological systems that were inspired and enabled by methods of network science. First, we present research highlights ranging from determination of the molecular interaction network within a cell to studies of architectural and functional properties of brain networks and biological transportation networks...
November 3, 2017: Physics of Life Reviews
https://www.readbyqxmd.com/read/29149889/electronic-cigarette-vapor-alters-the-lateral-structure-but-not-tensiometric-properties-of-calf-lung-surfactant
#12
Rebecca J Przybyla, Jason Wright, Rajan Parthiban, Saeed Nazemidashtarjandi, Savas Kaya, Amir M Farnoud
BACKGROUND: Despite their growing popularity, the potential respiratory toxicity of electronic cigarettes (e-cigarettes) remains largely unknown. One potential aspect of e-cigarette toxicity is the effect of e-cigarette vapor on lung surfactant function. Lung surfactant is a mixture of lipids and proteins that lines the alveolar region. The surfactant layer reduces the surface tension of the alveolar fluid, thereby playing a crucial role in lung stability. Due to their small size, particulates in e-cigarette vapor can penetrate the deep lungs and come into contact with the lung surfactant...
November 17, 2017: Respiratory Research
https://www.readbyqxmd.com/read/29149656/location-specific-mechanical-response-and-morphology-of-facial-soft-tissues
#13
Marco Pensalfini, Johannes Weickenmeier, Marga Rominger, Roberto Santoprete, Oliver Distler, Edoardo Mazza
The facial tissue of 9 healthy volunteers (m/f; age: 23-60y) is characterized at three different locations using a procedure combining suction measurements and 18MHz ultrasound imaging. The time-dependent and multilayered nature of skin is accounted for by adopting multiple loading protocols which differ with respect to suction probe opening size and rate of tissue deformation. Over 700 suction measurements were conducted and analyzed according to location-specific mechanical and morphological characteristics...
November 14, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29149565/enhanced-magnetic-hybridization-of-a-spinterface-through-insertion-of-a-two-dimensional-magnetic-oxide-layer
#14
Alberto Brambilla, Andrea Picone, Dario Giannotti, Alberto Calloni, Giulia Berti, Gianlorenzo Bussetti, Simona Achilli, Guido Fratesi, Mario Italo Trioni, Giovanni Vinai, Piero Torelli, Giancarlo Panaccione, Lamberto Duò, Marco Finazzi, Franco Ciccacci
Interfaces between organic semiconductors and ferromagnetic metals offer intriguing opportunities in the rapidly developing field of organic spintronics. Understanding and controlling the spin-polarized electronic states at the interface is the key towards a reliable exploitation of this kind of systems. Here we propose an approach consisting in the insertion of a two-dimensional magnetic oxide layer at the interface, with the aim of both increasing the reproducibility of the interface preparation and offering a way for a further fine control over the electronic and magnetic properties...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148983/densification-of-chlorine-doped-continuous-cnt-sheet-polyvinylidene-fluoride-sandwich-film-and-improvement-of-mechanical-and-dielectric-properties
#15
Jiyong Liang, Yizhuo Gu, Zhenchong Zhang, Shaokai Wang, Min Li, Zuoguang Zhang
The compacting structure of chlorine-doped continuous CNT sheet/polyvinylidene fluoride (Cl-CNT sheet/PVDF) was successfully optimized by means of hot-press treatment to improve mechanical and dielectric properties with high densification degree. Then, the densified Cl-CNT sheet/PVDF dielectric layer was inserted between two PVDF insulating layers to fabricate sandwich composite. It is found that the dielectric and mechanical properties are effectively enhanced, with the dielectric permittivity of 40.4 (@102 Hz), dielectric loss of 0...
November 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29145445/a-new-approach-by-optical-coherence-tomography-for-elucidating-biofilm-formation-by-emergent-candida-species
#16
Melyna Chaves Leite de Andrade, Marcos Andre Soares de Oliveira, Franz de Assis Graciano Dos Santos, Pamella de Brito Ximenes Vilela, Michellangelo Nunes da Silva, Danielle Patrícia Cerqueira Macêdo, Reginaldo Gonçalves de Lima Neto, Henrique Jonh Pereira Neves, Ildnay de Souza Lima Brandão, Guilherme Maranhão Chaves, Renato Evangelista de Araujo, Rejane Pereira Neves
The majority of microorganisms present a community lifestyle, establishing biofilm ecosystems. However, little is known about its formation in emergent Candida species involved in catheter-related infections. Thus, various techniques may be used in the biofilm detection to elucidate structure and clinical impact. In this context, we report the ability of emergent Candida species (Candida haemulonii, C. lusitaniae, C. pelliculosa, C.guilliermondii, C. famata and C. ciferrii) on developing well structured biofilms with cell viability and architecture, using optical coherence tomography (OCT)...
2017: PloS One
https://www.readbyqxmd.com/read/29144734/physically-unclonable-cryptographic-primitives-by-chemical-vapor-deposition-of-layered-mos2
#17
Abdullah Alharbi, Darren Armstrong, Somayah Alharbi, Davood Shahrjerdi
Physically unclonable cryptographic primitives are promising for securing the rapidly growing number of electronic devices. Here, we introduce a new class of physically unclonable primitives from layered molybdenum disulfide (MoS2) by leveraging the natural randomness of their island growth during chemical vapor deposition (CVD). We synthesize a MoS2 monolayer film covered with speckles of multilayer islands, where the growth process is engineered for an optimal speckle density. Using the Clark-Evans test, we confirm that the distribution of islands on the film exhibits complete spatial randomness, hence indicating the growth of multilayer speckles is a spatial Poisson process...
November 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/29143830/gramicidin-ion-channels-in-a-lipid-bilayer-supported-on-polyelectrolyte-multilayer-films-an-electrochemical-impedance-study
#18
Eleftheria Diamanti, Eduart Gutiérrez-Pineda, Nikolaos Politakos, Patrizia Andreozzi, María José Rodriguez-Presa, Wolfgang Knoll, Omar Azzaroni, Claudio A Gervasi, Sergio E Moya
Supported membranes on polymer cushions are of fundamental interest as models for cell membranes. The use of polyelectrolyte multilayers (PEMs) assembled by the layer by layer (LbL) technique as supports for a bilayer allows for easy integration of the lipid bilayer on surfaces and devices and for nanoscale tunable spacing of the lipid bilayer. Controlling ionic permeability in lipid bilayers supported on PEMs triggers potential applications in sensing and as models for transport phenomena in cell membranes...
November 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/29143418/identification-of-swallowing-disorders-in-early-and-mid-stage-parkinson-s-disease-using-pattern-recognition-of-pharyngeal-high-resolution-manometry-data
#19
C A Jones, M R Hoffman, L Lin, S Abdelhalim, J J Jiang, T M McCulloch
BACKGROUND: Parkinson's disease (PD) can cause severe dysphagia, especially later in disease progression. Early identification of swallowing dysfunction may lead to earlier intervention. Pharyngeal high-resolution manometry (HRM) provides complementary information to videofluoroscopy, with advantages of being quantitative and objective. Artificial neural network (ANN) classification can examine non-linear relationships among multiple variables with relatively low bias. We evaluated if ANN techniques could differentiate between patients with PD and healthy controls...
November 16, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/29140676/synthesis-of-large-area-tungsten-disulfide-films-on-pre-reduced-tungsten-suboxides-substrates
#20
Soo Ho Choi, Stephen Boandoh, Young Ho Lee, Joo Song Lee, Ji-Hoon Park, Soo Min Kim, Woochul Yang, Ki Kang Kim
We report a facile method for the synthesis of large-area tungsten disulfide (WS2) film by means of chemical vapor deposition (CVD). To promote WS2 film growth, the precursor solution, which includes pre-reduced tungsten suboxides, is prepared by using hydrazine as the strong reduction agent and spin-coated onto the growth substrate. Growth is then carried out in a CVD chamber vaporized with dimethyl disulfide (DMDS) as the sulfur precursor. While only WS2 flakes are grown with un-reduced tungsten precursor under hydrogen atmosphere, WS2 film is readily attained on pre-reduced tungsten suboxide substrates without the need for further reduction by hydrogen, which is noted to induce discontinuity of grown film...
November 15, 2017: ACS Applied Materials & Interfaces
keyword
keyword
30920
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"