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https://www.readbyqxmd.com/read/28335214/graphene-fets-with-low-resistance-hybrid-contacts-for-improved-high-frequency-performance
#1
Chowdhury Al-Amin, Mustafa Karabiyik, Phani Kiran Vabbina, Raju Sinha, Nezih Pala
This work proposes a novel geometry field effect transistor with graphene as a channel-graphene field-effect transistor (GFET), having a hybrid contact that consists of an ohmic source/drain and its extended part towards the gate, which is capacitively coupled to the channel. The ohmic contacts are used for direct current (DC) biasing, whereas their capacitive extension reduces access region length and provides the radio frequency (RF) signal a low impedance path. Minimization of the access region length, along with the paralleling of ohmic contact's resistance and resistive part of capacitively coupled contact's impedance, lower the overall source/drain resistance, which results in an increase in current gain cut-off frequency, fT...
May 10, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28333433/high-performance-complementary-transistors-and-medium-scale-integrated-circuits-based-on-carbon-nanotube-thin-films
#2
Zhiyong Zhang, Yingjun Yang, Li Ding, Jie Han, Lian-Mao Peng
Solution-derived carbon nanotube (CNT) network films with high semiconducting purity are suitable materials for the wafer-scale fabrication of field-effect transistors (FETs) and integrated circuits (ICs). However, it is challenging to realize high-performance complementary metal-oxide-semiconductor (CMOS) FETs with high yield and stability on such CNT network films, and this difficulty hinders the development of CNT-film-based ICs. In this work, we developed a doping-free process for the fabrication of CMOS FETs based on solution-processed CNT network films, in which the polarity of the FETs was controlled by using Sc or Pd as the source/drain contacts to selectively inject carriers into the channels...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28333292/a-randomized-double-blinded-controlled-trial-of-hcg-as-luteal-phase-support-in-natural-cycle-frozen-embryo-transfer
#3
Vivian Chi Yan Lee, Raymond Hang Wun Li, William Shu Biu Yeung, H O Pak Chung, Ernest Hung Yu Ng
STUDY QUESTION: Does the use of hCG as luteal phase support in natural cycle frozen embryo transfer (FET) increase the ongoing pregnancy rate? STUDY ANSWER: The use of hCG in natural cycle FET did not improve the ongoing pregnancy rate. WHAT IS KNOWN ALREADY: The use of luteal phase support in stimulated cycles has been associated with higher live-birth rates and the results are similar when using hCG or progesterone. STUDY DESIGN SIZE, DURATION: This is a randomized double-blinded controlled trial of 450 women recruited between August 2013 and October 2015...
March 8, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28333034/treatment-of-thin-endometrium-with-autologous-platelet-rich-plasma-a-pilot-study
#4
Shahrzad Zadehmodarres, Saghar Salehpour, Nasrin Saharkhiz, Leila Nazari
Endometrium is one of the main factors in pregnancy. During assisted reproductive technology (ART) treatments, some cycles are cancelled due to inadequate endometrial growth. This study was conducted to evaluate the effectiveness of platelet-rich plasma (PRP) in the treatment of thin endometrium. Ten patients with history of inadequate endometrial growth in frozen-thawed embryo transfer (FET) cycles were recruited into the study. Intrauterine infusion of PRP was performed. Endometrial thickness was assessed...
February 1, 2017: JBRA Assisted Reproduction
https://www.readbyqxmd.com/read/28326237/advances-in-the-fabrication-of-graphene-transistors-on-flexible-substrates
#5
Gabriele Fisichella, Stella Lo Verso, Silvestra Di Marco, Vincenzo Vinciguerra, Emanuela Schilirò, Salvatore Di Franco, Raffaella Lo Nigro, Fabrizio Roccaforte, Amaia Zurutuza, Alba Centeno, Sebastiano Ravesi, Filippo Giannazzo
Graphene is an ideal candidate for next generation applications as a transparent electrode for electronics on plastic due to its flexibility and the conservation of electrical properties upon deformation. More importantly, its field-effect tunable carrier density, high mobility and saturation velocity make it an appealing choice as a channel material for field-effect transistors (FETs) for several potential applications. As an example, properly designed and scaled graphene FETs (Gr-FETs) can be used for flexible high frequency (RF) electronics or for high sensitivity chemical sensors...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28322554/schottky-barriers-in-bilayer-phosphorene-transistors
#6
Yuanyuan Pan, Yang Dan, Yangyang Wang, Meng Ye, Han Zhang, Ruge Quhe, Xiuying Zhang, Jingzhen Li, Wanlin Guo, Li Yang, Jing Lu
It is unreliable to evaluate the Schottky barrier height (SBH) in monolayer (ML) 2D material field effect transistors (FETs) with strongly interacted electrode from the work function approximation (WFA) because of existence of the Fermi-level pinning. Here, we report the first systematical study of bilayer (BL) phosphorene FETs in contact with a series of metals with a wide work function range ( Al, Ag, Cu, Au, Cr, Ti, Ni, and Pd) by using both ab initio electronic band calculations and quantum transport simulation (QTS)...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28316242/wafer-scale-synthesis-of-high-quality-semiconducting-two-dimensional-layered-inse-with-broadband-photoresponse
#7
Zhibin Yang, Wenjing Jie, Chun-Hin Mak, Shenghuang Lin, Huihong Lin, Xianfeng Yang, Feng Yan, Shu Ping Lau, Jianhua Hao
Large-scale synthesis of two-dimensional (2D) materials is one of the significant issues for fabricating layered materials into practical devices. As one of the typical III-VI semiconductors, InSe has attracted much attention due to its outstanding electrical transport property, attractive quantum physics characteristics and dramatic photoresponse when it is reduced to atomic scale. However, scalable synthesis of single phase 2D InSe has not yet been achieved so far, greatly hindering further fundamental studies and device applications...
March 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28314362/design-of-high-performance-si-sige-heterojunction-tunneling-fets-with-a-t-shaped-gate
#8
Wei Li, Hongxia Liu, Shulong Wang, Shupeng Chen, Zhaonian Yang
In this paper, a new Si/SiGe heterojunction tunneling field-effect transistor with a T-shaped gate (HTG-TFET) is proposed and investigated by Silvaco-Atlas simulation. The two source regions of the HTG-TFET are placed on both sides of the gate to increase the tunneling area. The T-shaped gate is designed to overlap with N(+) pockets in both the lateral and vertical directions, which increases the electric field and tunneling rate at the top of tunneling junctions. Moreover, using SiGe in the pocket regions leads to the smaller tunneling distance...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28306240/atomic-layer-etching-mechanism-of-mos2-for-nano-devices
#9
Ki Seok Kim, Ki Hyun Kim, Yeonsig Nam, Jaeho Jeon, Soonmin Yim, Eric Singh, Jin Yong Lee, Sungjoo Lee, Yeon Sik Jung, Geun Young Yeom, Dong Woo Kim
Among the layered transition metal dichalcogenides (TMDs), which can form stable two-dimensional crystal structures, molybdenum disulfide (MoS2) has been intensively investigated in various electronic and optoelectronic applications, according to different band-gap energies from 1.29 eV to 1.9 eV as the number of layers is decreased, due to its unique properties. To control the MoS2 layers, atomic layer etching (ALE), a cyclic etching consisting of a radical-adsorption step such as Cl adsorption and a reacted-compound desorption step that is through a low-energy Ar(+)-ion exposure, can be a highly effective technique that avoids the inducement of damage and the contamination that are from the reactive steps...
March 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28299691/fabrication-of-hydrogenated-diamond-metal-insulator-semiconductor-field-effect-transistors
#10
Jiangwei Liu, Yasuo Koide
Diamond is regarded as a promising material for fabrication of high-power and high-frequency electronic devices due to its remarkable intrinsic properties, such as wide band gap energy, high carrier mobility, and high breakdown field. Meanwhile, since diamond has good biocompatibility, long-term durability, good chemical inertness, and a large electron-chemical potential window, it is a suitable candidate for the fabrication of biosensors. Here, we demonstrate the fabrication of hydrogenated diamond (H-diamond) based metal-insulator-semiconductor field-effect transistors (MISFETs)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28299688/all-electrical-graphene-dna-sensor-array
#11
Jeffrey Abbott, Donhee Ham, Guangyu Xu
Electrical sensing of biomolecules has been an important pursuit due to the label-free operation and chip-scale construct such sensing modality can enable. In particular, electrical biomolecular sensors based on nanomaterials such as semiconductor nanowires, carbon nanotubes, and graphene have demonstrated high sensitivity, which in the case of nanowires and carbon nanotubes can surpass typical optical detection sensitivity. Among these nanomaterials, graphene is well suited for a practical candidate for implementing a large-scale array of biomolecular sensors, as its two-dimensional morphology is readily compatible with industry standard top-down fabrication techniques...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28295639/role-of-charge-traps-in-the-performance-of-atomically-thin-transistors
#12
Iddo Amit, Tobias J Octon, Nicola J Townsend, Francesco Reale, C David Wright, Cecilia Mattevi, Monica F Craciun, Saverio Russo
Transient currents in atomically thin MoTe2 field-effect transistors (FETs) are measured during cycles of pulses through the gate electrode. The curves of the transient currents are analyzed in light of a newly proposed model for charge-trapping dynamics that renders a time-dependent change in the threshold voltage as the dominant effect on the channel hysteretic behavior over emission currents from the charge traps. The proposed model is expected to be instrumental in understanding the fundamental physics that governs the performance of atomically thin FETs and is applicable to the entire class of atomically thin-based devices...
March 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28291019/in-situ-thermal-annealing-of-on-membrane-soi-semiconductor-based-devices-after-high-gamma-dose-irradiation
#13
Sedki Amor, Nicolas André, Valeriya Kilchytska, Fares Tounsi, Brahim Mezghani, Pierre Gérard, S Z Ali, Florin Udrea, Denis Flandre, Laurent A Francis
In this paper, we investigate the recovery of some semiconductor-based components, such as N/P-type field-effect transistors (FETs) and a Complementary Metal-Oxide-Semiconductor (CMOS) inverter, after being exposed to a high total dose of gamma rays radiation. The employed method consists mainly in a rapid, low power and in-situ annealing mitigation technique by Silicon-On-Insulator (SOI) micro-hotplates. Due to the ionizing effect of the gamma irradiation, the threshold voltages showed an average shift of 580 mV for N-channel transistors, and -360 mV for P-MOSFETs...
March 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28290392/potential-for-differentiation-of-glioma-recurrence-from-radionecrosis-using-integrated-18-f-fluoroethyl-l-tyrosine-fet-positron-emission-tomography-magnetic-resonance-imaging-a-prospective-evaluation
#14
Shanti K Sogani, Amarnath Jena, Sangeeta Taneja, Aashish Gambhir, Anil K Mishra, Maria M D'Souza, Sapna M Verma, Puja P Hazari, Pradeep Negi, Ganesh K R Jadhav
PURPOSE: To assess the utility of 18F-fluoroethyl-L-tyrosine (FET) positron emission tomography/magnetic resonance imaging (PET/MRI) in distinguishing recurrence from radionecrosis. MATERIALS AND METHODS: Thirty-two patients (25 males, 7 females) of glioma who had already undergone surgery/chemoradiotherapy and had enhancing brain lesions suspicious of recurrence were evaluated using integrated 18F-FET PET/MRI, and followed up with histopathology or clinical follow-up and/or MRI/PET/MRI imaging...
March 2017: Neurology India
https://www.readbyqxmd.com/read/28287908/comparison-of-different-advanced-oxidation-processes-for-the-removal-of-amoxicillin-in-aqueous-solution
#15
Fernanda Siqueira Souza, Vanessa Vargas da Silva, Catiusa Kuchak Rosin, Luana Hainzenreder, Alexandre Arenzon, Liliana Amaral Féris
Amoxicillin (AMX) is a widely used penicillin-type antibiotic whose presence in the environment has been investigated. In this work, the degradation of the AMX in aqueous solutions by ozonation, ozonation with UV radiation (O3/UV), homogeneous catalytic ozonation (O3/Fe(2+)) and homogeneous photocatalytic ozonation (O3/Fe(2+)/UV) was investigated. The performance results have been compared in terms of removal of amoxicillin and total organic carbon (mineralization efficiency). In all processes, complete amoxicillin degradation was obtained after 5 min...
March 13, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28284074/hierarchical-templating-in-deposition-of-semi-covalently-imprinted-inverse-opal-polythiophene-film-for-femtomolar-determination-of-human-serum-albumin
#16
Marcin Dabrowski, Maciej Cieplak, Piyush Sindhu Sharma, Pawel Borowicz, Krzysztof Noworyta, Wojciech Lisowski, Francis D'Souza, Alexander Kuhn, Wlodzimierz Kutner
Nanostructured artificial receptor materials with unprecedented hierarchical structure for determination of human serum albumin (HSA) are designed and fabricated. For that purpose a new hierarchical template is prepared. This template allowed for simultaneous structural control of the deposited molecularly imprinted polymer (MIP) film on three length scales. A colloidal crystal templating with optimized electrochemical polymerization of 2,3'-bithiophene enables deposition of an MIP film in the form of an inverse opal...
March 1, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28283219/pet-mri-multiparametric-imaging-of-brain-tumors
#17
Jiří Ferda, Eva Ferdová, Ondřej Hes, Jan Mraček, Boris Kreuzberg, Jan Baxa
A combination of morphological imaging of the brain with microstructural and functional imaging provides a comprehensive overview of the properties of individual tissues. While diffusion weighted imaging provides information about tissue cellularity, spectroscopic imaging allows us to evaluate the integrity of neurons and possible anaerobic glycolysis during tumor hypoxia, in addition to the presence of accelerated synthesis or degradation of cellular membranes; on the other hand, PET metabolic imaging is used to evaluate major metabolic pathways, determining the overall extent of the tumor ((18)F-FET, (18)F-FDOPA, (18)F-FCH) or the degree of differentiation ((18)F-FDG, (18)F-FLT, (18)F-FDOPA and (18)F-FET)...
February 22, 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28282918/zebrafish-embryo-as-an-in-vivo-model-for-behavioral-and-pharmacological-characterization-of-methylxanthine-drugs
#18
Ram Manohar Basnet, Michela Guarienti, Maurizio Memo
Zebrafish embryo is emerging as an important tool for behavior analysis as well as toxicity testing. In this study, we compared the effect of nine different methylxanthine drugs using zebrafish embryo as a model. We performed behavioral analysis, biochemical assay and Fish Embryo Toxicity (FET) test in zebrafish embryos after treatment with methylxanthines. Each drug appeared to behave in different ways and showed a distinct pattern of results. Embryos treated with seven out of nine methylxanthines exhibited epileptic-like pattern of movements, the severity of which varied with drugs and doses used...
March 9, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28277115/does-premature-elevated-progesterone-on-the-day-of-trigger-increase-spontaneous-abortion-rates-in-fresh-and-subsequent-frozen-embryo-transfers
#19
Mae Healy, George Patounakis, Austin Zanelotti, Kate Devine, Alan DeCherney, Michael Levy, Micah J Hill
Recent evidence has shown elevated progesterone (P) advances the endometrium in fresh ART cycles, creating asynchrony with the embryo and thus implantation failure and decreased live birth rates. If the window of implantation is closing as the embryo attempts to implant, there may be difficulty with trophoblastic invasion, leading to failure of early pregnancies. Our objective was to evaluate if P on the day of trigger was associated with spontaneous abortion (SAB) rates in fresh ART transfers. This was a retrospective cohort study involving fresh autologous and FET cycles from 2011 to 2013...
March 2, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28276192/the-pregnancy-outcome-of-progesterone-primed-ovarian-stimulation-using-medroxyprogesterone-acetate4mg-versus-10mg-daily-in-infertile-women-undergoing-in-vitro-fertilization-a-randomized-controlled-trial
#20
J Dong, Y Wang, W R Chai, Q Q Hong, N L Wang, L H Sun, H Long, L Wang, H Tian, Q F Lyu, X F Lu, Q J Chen, Y P Kuang
OBJECTIVE: To investigate the clinical outcome and endocrinological characteristics of progestin-primed ovarian stimulation (PPOS) using medroxyprogesterone acetate (MPA) 4mg versus 10mg daily in infertile women with normal ovary reserve. DESIGN: A randomized parallel controlled trial. SETTING: Tertiary-care academic medical center. PARTICIPANTS: 300 infertile women undergoing IVF/ICSI treatment. METHODS: HMG 225IU/d and MPA (group A: 10mg/d; group B: 4mg/d) were started simultaneously from cycle day 3 onwards...
March 9, 2017: BJOG: An International Journal of Obstetrics and Gynaecology
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