A light-controlled resistive switching memory

Sketch of the configuration of a light-controlled resistive switching memory. Light enters through the Al 2O 3 uncovered surface and reaches the optically active p-Si substrate, where carriers are photogenerated and subsequently injected in the Al 2O 3 layer when a suitable voltage pulse is applied. The resistance of the Al 2O 3 can be switched between different non-volatile states, depending on the applied voltage pulse and on the illumination conditions.Fil: Ungureanu, Mariana. CIC nanoGUNE Consolider; EspañaFil: Zazpe, Raul. CIC nanoGUNE Consolider; EspañaFil: Golmar, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Industrial; Argentina. CIC nanoGUNE Consolider; EspañaFil: Stoliar, Pablo Alberto. Comisión Nacional de Energía Atómica; Argentina. CIC nanoGUNE Consolider; EspañaFil: Llopis, Roger. CIC nanoGUNE Consolider; EspañaFil: Casanova, Felix. CIC nanoGUNE Consolider; España. Basque Foundation for Science; EspañaFil: Hueso, Luis E.. CIC nanoGUNE Consolider; España. Basque Foundation for Science; Españ

TiO2 ALD Coating of Amorphous TiO2 Nanotube Layers: Inhibition of the Structural and Morphological Changes Due to Water Annealing

The present work presents a strategy to stabilize amorphous anodic self-organized TiO2 nanotube layers against morphological changes and crystallization upon extensive water soaking. The growth of needle-like nanoparticles was observed on the outer and inner walls of amorphous nanotube layers after extensive water soakings, in line with the literature on water annealing. In contrary, when TiO2 nanotube layers uniformly coated by thin TiO2 using atomic layer deposition (ALD) were soaked in water, the growth rates of needle-like nanoparticles were substantially reduced. We investigated the soaking effects of ALD TiO2 coatings with different thicknesses and deposition temperatures. Sufficiently thick TiO2 coatings (≈8.4 nm) deposited at different ALD process temperatures efficiently hamper the reactions between water and F− ions, maintain the amorphous state, and preserve the original tubular morphology. This work demonstrates the possibility of having robust amorphous 1D TiO2 nanotube layers that are very stable in water. This is very practical for diverse biomedical applications that are accompanied by extensive contact with an aqueous environment

Riesgo quirúrgico tras resección pulmonar anatómica en cirugía torácica. Modelo predictivo a partir de una base de datos nacional multicéntrica

Introduction: the aim of this study was to develop a surgical risk prediction model in patients undergoing anatomic lung resections from the registry of the Spanish Video-Assisted Thoracic Surgery Group (GEVATS). Methods: data were collected from 3,533 patients undergoing anatomic lung resection for any diagnosis between December 20, 2016 and March 20, 2018. We defined a combined outcome variable: death or Clavien Dindo grade IV complication at 90 days after surgery. Univariate and multivariate analyses were performed by logistic regression. Internal validation of the model was performed using resampling techniques. Results: the incidence of the outcome variable was 4.29% (95% CI 3.6-4.9). The variables remaining in the final logistic model were: age, sex, previous lung cancer resection, dyspnea (mMRC), right pneumonectomy, and ppo DLCO. The performance parameters of the model adjusted by resampling were: C-statistic 0.712 (95% CI 0.648-0.750), Brier score 0.042 and bootstrap shrinkage 0.854. Conclusions: the risk prediction model obtained from the GEVATS database is a simple, valid, and reliable model that is a useful tool for establishing the risk of a patient undergoing anatomic lung resection

Grupo español de cirugía torácica asistida por videoimagen: método, auditoría y resultados iniciales de una cohorte nacional prospectiva de pacientes tratados con resecciones anatómicas del pulmón

Introduction: our study sought to know the current implementation of video-assisted thoracoscopic surgery (VATS) for anatomical lung resections in Spain. We present our initial results and describe the auditing systems developed by the Spanish VATS Group (GEVATS). Methods: we conducted a prospective multicentre cohort study that included patients receiving anatomical lung resections between 12/20/2016 and 03/20/2018. The main quality controls consisted of determining the recruitment rate of each centre and the accuracy of the perioperative data collected based on six key variables. The implications of a low recruitment rate were analysed for '90-day mortality' and 'Grade IIIb-V complications'. Results: the series was composed of 3533 cases (1917 VATS; 54.3%) across 33 departments. The centres' median recruitment rate was 99% (25-75th:76-100%), with an overall recruitment rate of 83% and a data accuracy of 98%. We were unable to demonstrate a significant association between the recruitment rate and the risk of morbidity/mortality, but a trend was found in the unadjusted analysis for those centres with recruitment rates lower than 80% (centres with 95-100% rates as reference): grade IIIb-V OR=0.61 (p=0.081), 90-day mortality OR=0.46 (p=0.051). Conclusions: more than half of the anatomical lung resections in Spain are performed via VATS. According to our results, the centre's recruitment rate and its potential implications due to selection bias, should deserve further attention by the main voluntary multicentre studies of our speciality. The high representativeness as well as the reliability of the GEVATS data constitute a fundamental point of departure for this nationwide cohort

Tenké vrstvy MoSe2 připravené depozicí atomárních vrstev: XPS analýzy

Molybdenum diselenide (MoSe2) thin films were deposited on annealed titanium foils by atomic layer deposition using suitable precursors. In this paper, a detailed x-ray photoelectron spectroscopy analysis of the MoSe2 film is presented. Survey spectra, Mo 3d, Se 3d, Mo 3p, Se LMM, Se 3p, C 1s, and Se 4s core level along with the valence band spectra were measured. Quantitative analysis indicates a surface composition of MoSe1.8, suggesting a deficiency of selenium on the surface.Tenké vrstvy selenidu molybdenatého (MoSe2) byly deponovány na vyžíhané titanové fólie pomocí depozice atomárních vrstev s využitím vhodných prekursorů. V článku popisujeme detailní analýzu těchto vrstev pomocí rentgenové fotoelektronové spektroskopie (XPS). V přehledovém spektru byly měřeny struktury jader Mo 3d, Se 3d, Mo 3p, Se LMM, Se 3p, C 1s, and Se 4s a také spektra valenčních pásů. Kvantitativní analýza indikovala povrochové složení MoSe1.8, které poukazuje na nedostatečné množství Se v povrchové vrstvě

CdS-coated TiO2 nanotube layers: downscaling tube diameter towards efficient heterostructured photo-electrochemical conversion

Novel heterostructured solar cell based on TiO2 nanotube layers uniformly coated by CdS thin layer (using ALD) is presented. Downscaling the nanotube diameter (95 to 35nm) enhanced twice the UV and VIS light photocurrents. Further photocurrent improvement resulted from prior annealing of TiO2 nanotube layers from 300 to 600°C

2D MoSe2 Structures Prepared by Atomic Layer Deposition

Here, we demonstrate the preparation of 2D MoSe2 structures by the atomic layer deposition technique. In this work, we use ((CH3)3Si)2Se as the Se precursor and Mo(CO)6 or MoCl5 as the Mo precursors. The X-ray photoelectron spectroscopy (XPS) analyses of the prepared samples have revealed that using the MoCl5 precursor the obtained structure of MoSe2 is nearly identical to the reference powder MoSe2 sample while the composition of the sample prepared from Mo(CO)6 contains a significant amount of oxygen atoms. Further inspection of as-deposited samples via scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy has disclosed that the MoSe2 structure based on MoCl5 is formed from randomly oriented well crystalline flakes with their size ≈100 nm in contrast to the Mo–Se–O compact film originating from Mo(CO)6

Uniformní ALD depozice Pt nanočástic v 1D anodických TiO2 nanotrubicích pro fotokatalytický vývoj H2

In the present work we investigate the utilization of Pt nanoparticles produced by atomic layer deposition (ALD) within anodic TiO2 nanotube (NT) layers for photocatalytic H-2 production. By varying the number of ALD cycles, Pt nanoparticles with different diameters were produced, uniformly decorating the tube walls. The Pt nano-particle size (2-15 nm), the Pt mass loading and areal density were strongly dependent on the number of Pt ALD cycles. The deposited Pt nanoparticles turned out to be highly effective as a co-catalyst for photocatalytic H-2 generation. The most effective performance for solar light photocatalysis was reached after 26 ALD cycles (yielding an optimal area coverage with particles of diameter approximate to 7 nm). For UV light, the optimum photocatalytic efficiency was reached after 40 ALD cycles.V prezentované práci jsme zkoumali využití nanočástic Pt vyrobených depozicí atomárních vrstev (ALD) uvnitř anodických TiO2 nanotrubic pro fotokatalytický vývoj H2. Různým počtem ALD cyklů byly vyrobeny Pt nanočástice různých průměrů, jimiž bylo homogenně dekorovány stěny nanotrubic. Velikost Pt nanočástic byla 2-15nm, obsah platiny a plošná hustota byla silně závislá na počtu ALD cyklů. Nanočástice Pt se ukázaly jako vysoce účinné ko-katalyzátory pro fotokatalytický vývoj H2. Nejvíce efektivní katalýzy slunečním světlem bylo dosaženo pro Pt nanočástice připravené při 26 ALD cyklech (poskytující optimální pokrytí nanotrubic nanočásticemi Pt o průměru ≈ 7 nm). V ultrafialové oblasti záření bylo dosaženo optima fotokatalytické efektivity po 40 ALD cyklech

Depozice atomárních vrstev fotoelektrokatalytického materiálu na 3D tištěné uhlíkové nanostruktury.

3D-printing is an excellent tool for the prototyping and fabrication of a variety of devices. The ability to rapidly create on demand structures opens the vast possibilities for the innovations in catalysis and energy conversion/storage devices. The major bottleneck is that the materials which are suitable for 3D-printing usually do not possess the required energy conversion/storage ability. Atomic layer deposition (ALD) strategically offers homogeneous and conformal deposition of functional layers without compromising the 3D topography. Here, we show that readily fabricated fused deposition modeling extruded nanocarbon/polylactic acid (PLA) electrodes can be modified by a photoelectrocatalytic material with atomic precision. We use an archetypal material, MoS2, with high electrocatalytic hydrogen evolution reaction (HER) activity, whilst possesses high photons absorption in the visible spectral region. We optimized the ALD process at low temperature to coat 3D-printed nanocarbon/PLA electrodes with different number of MoS2 ALD cycles for photoelectrocatalytic HER. We present for the first time, the feasibility of low temperature transition metal dichalcogenide coatings on 3D-printed nanocarbon surface, unequivocally elevate the benchmark of functional coatings by ALD on any 3D-printed platforms.3D tisk je excelentní nástroj pro přípravu prototypů a výrobu různých zařízení. Schopnost tohoto tisku rychle připravit požadované struktury otevírá možnosti pro inovaci v katalýze a zařízení na přemenu a uchování energie. Hlavní nevýhodou 3D tištěných materiálů zůstává jejich nedostatečná stabilita pro tyto aplikace. Depozice atomárních vrstev je strategická v tom, že nabízí homogenní a rovnoměrnou depozici funkčních vrstev bez kompromisů s ohledem na 3D tvarovost. V této práci ukazujeme, že elektrody na bázi směsi nanouhlíku a kyseliny polymléčné (PLA) tištěné 3D technologií filamentů bez formy mohou být modifikovýny fotoelektrokatalytickým materiálem s atomární přesností. Použili jsme pro tento účel typický materiál - MoS2 - který disponuje vysokou elektrokatalytickou aktivitou pro vývoj vodíku (HER), a který zároveň vykazuje vysokou absorpci fotonů ve viditelné spektrální oblasti. Optimalizovali jsme ALD proces při nízké teplotě s cílem pokrýt elektrody na bázi nanouhlíku/PLA s různými počty ALD MoS2 cyklů pro fotokatalytickou reakci HER. V této práci poprvé představujeme možnosti pokrýtí 3D tisknutých elektrod chalkogenidy kovů, které jednoznačně posouvají měřítko funkčních ALD vrstev na jakékoliv 3D tisknuté platformě