Nucleant layer effect on nanocolumnar ZnO films grown by electrodeposition

Different ZnO nanostructured films were electrochemically grown, using an aqueous solution based on ZnCl2, on three types of transparent conductive oxides grow on commercial ITO (In2O3:Sn)-covered glass substrates: (1) ZnO prepared by spin coating, (2) ZnO prepared by direct current magnetron sputtering, and (3) commercial ITO-covered glass substrates. Although thin, these primary oxide layers play an important role on the properties of the nanostructured films grown on top of them. Additionally, these primary oxide layers prevent direct hole combination when used in optoelectronic devices. Structural and optical characterizations were carried out by scanning electron microscopy, atomic force microscopy, and optical transmission spectroscopy. We show that the properties of the ZnO nanostructured films depend strongly on the type of primary oxide-covered substrate used. Previous studies on different electrodeposition methods for nucleation and growth are considered in the final discussion.We thank Prof. A. Segura of the Universitat de Valencia for the facilities with the sputtering equipment. This work was supported by the project PROMETEO/2009/074 from the Generalitat Valenciana.Reyes Tolosa, MD.; Damonte, LC.; Brine, H.; Bolink, HJ.; Hernández Fenollosa, MDLÁ. (2013). Nucleant layer effect on nanocolumnar ZnO films grown by electrodeposition. Nanoscale Research Letters. 8:135-144. https://doi.org/10.1186/1556-276X-8-135S1351448Franklin JB, Zou B, Petrov P, McComb DW, Ryanand MP, McLachlan MA,J: Optimised pulsed laser deposition of ZnO thin films on transparent conducting substrates. Mater Chem 2011, 21: 8178–8182. 10.1039/c1jm10658aJaroslav B, Andrej V, Marie N, Šuttab P, Miroslav M, František U: Cryogenic pulsed laser deposition of ZnO. Vacuum 2012, 86(6):684–688. 10.1016/j.vacuum.2011.07.033Jae Bin L, Hyeong Joon K, Soo Gil K, Cheol Seong H, Seong-Hyeon H, Young Hwa S, Neung Hun L: Deposition of ZnO thin films by magnetron sputtering for a film bulk acoustic resonator. Thin Solid Films 2003, 435: 179–185. 10.1016/S0040-6090(03)00347-XXionga DP, Tanga XG, Zhaoa WR, Liua QX, Wanga YH, Zhoub SL: Deposition of ZnO and MgZnO films by magnetron sputtering. Vacuum 2013, 89: 254–256.Reyes Tolosa MD, Orozco-Messana J, Lima ANC, Camaratta R, Pascual M, Hernandez-Fenollosa MA: Electrochemical deposition mechanism for ZnO nanorods: diffusion coefficient and growth models. J Electrochem Soc 2011, 158(11):E107-E110.Ming F, Ji Z: Mechanism of the electrodeposition of ZnO nanosheets below room temperature. J Electrochem Soc 2010, 157(8):D450-D453. 10.1149/1.3447738Pullini D, Pruna A, Zanin S, Busquets Mataix D: High-efficiency electrodeposition of large scale ZnO nanorod arrays for thin transparent electrodes. J Electrochem Soc 2012, 159: E45-E51. 10.1149/2.093202jesPruna A, Pullini D, Busquets Mataix D: Influence of deposition potential on structure of ZnO nanowires synthesized in track-etched membranes. J Electrochem Soc 2012, 159: E92-E98. 10.1149/2.003205jesMarotti RE, Giorgi P, Machado G, Dalchiele EA: Crystallite size dependence of band gap energy for electrodeposited ZnO grown at different temperatures. Solar Energy Materials and Solar Cells 2009, 90(15):2356–2361.Yeong Hwan K, Myung Sub K, Jae Su Y: Structural and optical properties of ZnO nanorods by electrochemical growth using multi-walled carbon nanotube-composed seed layers. Nanoscale Res Lett 2012, 7: 13. 10.1186/1556-276X-7-13Elias J, Tena-Zaera R, Lévy-Clément C: Electrodeposition of ZnO nanowires with controlled dimensions for photovoltaic applications: role of buffer layer. Thin Solid Films 2007, 515(24):8553–8557. 10.1016/j.tsf.2007.04.027Zhai Y, Zhai S, Chen G, Zhang K, Yue Q, Wang L, Liu J, Jia J: Effects of morphology of nanostructured ZnO on direct electrochemistry and biosensing properties of glucose oxidase. J Electroanal Chem 2011, 656: 198–205. 10.1016/j.jelechem.2010.11.020Reyes Tolosa MD, Orozco-Messana J, Damonte LC, Hernandez-Fenollosa MA: ZnO nanoestructured layers processing with morphology control by pulsed electrodeposition. J Electrochem Soc 2011, 158(7):D452-D455. 10.1149/1.3593004Gouxa A, Pauporté T, Chivot J, Lincot D: Temperature effects on ZnO electrodeposition. Electrochim Acta 2005, 50(11):2239–2248. 10.1016/j.electacta.2004.10.007Kwok WM, Djurisic , Aleksandra B, Leung , Yu H, Li D, Tam KH, Phillips DL, Chan WK: Influence of annealing on stimulated emission in ZnO nanorods. Appl Phys Lett 2006, 89(18):183112. 183112–3 183112–3 10.1063/1.2378560Donderis V, Hernández-Fenollosa MA, Damonte LC, Marí B, Cembrero J: Enhancement of surface morphology and optical properties of nanocolumnar ZnO films. Superlattices and Microstructures 2007, 42: 461–467. 10.1016/j.spmi.2007.04.068Ghayour H, Rezaie HR, Mirdamadi S, Nourbakhsh AA: The effect of seed layer thickness on alignment and morphology of ZnO nanorods. Vacuum 2011, 86: 101–105. 10.1016/j.vacuum.2011.04.025Michael B, Mohammad Bagher R, Sayyed-Hossein K, Wojtek W, Kourosh K-z: Aqueous synthesis of interconnected ZnO nanowires using spray pyrolysis deposited seed layers. Mater Lett 2010, 64: 291–294. 10.1016/j.matlet.2009.10.065Jang Bo S, Hyuk C, Sung-O K: Rapid hydrothermal synthesis of zinc oxide nanowires by annealing methods on seed layers. J Nanomater 2011, 2011: 6.Peiro AM, Punniamoorthy R, Kuveshni G, Boyle DS, Paul O’B, Donal DC, Bradley , Jenny N, Durrant JR: Hybrid polymer/metal oxide solar cells based on ZnO columnar structures. J Mater Chem 2006, 16(21):2088–2096. 10.1039/b602084dVallet-Regí M, Salinas AJ, Arcos D: From the bioactive glasses to the star gels. J Mater Sci Mater Med 2006, 17: 1011–1017.Peulon S, Lincot D: Mechanistic study of cathodic electrodeposition of zinc oxide and zinc hydroxychloride films from oxygenated aqueous zinc chloride solutions. J Electrochem Soc 1998, 145: 864. 10.1149/1.1838359Dalchiele EA, Giorgi P, Marotti RE, Martín F, Ramos-Barrado JR, Ayouci R, Leinen D: Electrodeposition of ZnO thin films on n-Si(100). Sol. Energy Mater. Sol. Cells 2001, 70: 245. 10.1016/S0927-0248(01)00065-4Courtney IA, Dahn JR: Electrochemical and in situ X‐ray diffraction studies of the reaction of lithium with tin oxide composites. J Electrochem Soc 1997, 144(6):2045–2052. 10.1149/1.183774

Rate and duration of hospitalisation for acute pulmonary embolism in the real-world clinical practice of different countries : Analysis from the RIETE registry

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Influence of recent immobilization or surgery on mortality in cancer patients with venous thromboembolism

BACKGROUND: The influence of recent immobilization or surgery on mortality in cancer patients with venous thromboembolism (VTE) has not been thoroughly studied. METHODS: We used the RIETE Registry data to compare the 3-month mortality rate in cancer patients with VTE, with patients categorized according to the presence of recent immobilization, surgery or neither. The major outcomes were fatal pulmonary embolism (PE) and fatal bleeding within the first 3 months. RESULTS: Of 6,746 patients with active cancer and acute VTE, 1,224 (18%) had recent immobilization, 1,055 (16%) recent surgery, and 4,467 (66%) had neither. The all-cause mortality was 23.4% (95% CI: 22.4-24.5), and the PE-related mortality: 2.5% (95% CI: 2.1-2.9). Four in every ten patients dying of PE had recent immobilization (37%) or surgery (5.4%). Only 28% of patients with immobilization had received prophylaxis, as compared with 67% of the surgical. Fatal PE was more common in patients with recent immobilization (5.0%; 95% CI: 3.9-6.3) than in those with surgery (0.8%; 95% CI: 0.4-1.6) or neither (2.2%; 95% CI: 1.8-2.6). On multivariate analysis, patients with immobilization were at an increased risk for fatal PE (odds ratio: 1.8; 95% CI: 1.2-2.5). CONCLUSIONS: One in every three cancer patients dying of PE had recent immobilization for ≥ 4 days. Many of these deaths could have been prevented with adequate thromboprophylaxis

Influence of recent immobilization and recent surgery on mortality in patients with pulmonary embolism

BACKGROUND: The influence of recent immobilization or surgery on mortality in patients with pulmonary embolism (PE) is not well known. METHODS: We used the Registro Informatizado de Enfermedad TromboEmb\uf3lica (RIETE) data to compare the 3-month mortality rate in patients with PE, with patients categorized according to the presence of recent immobilization, recent surgery, or neither. RESULTS: Of 18,028 patients with PE, 4169 (23%) had recent immobilization, 2212 (12%) had recent surgery, and 11,647 (65%) had neither. The all-cause mortality was 10.0% (95% confidence interval [CI] 9.5-10.4), and the PE-related mortality was 2.6% (95% CI 2.4-2.9). One in every two patients who died from PE had recent immobilization (43%) or recent surgery (6.7%). Only 25% of patients with immobilization had received prophylaxis, as compared with 65% of the surgical patients. Fatal PE was more common in patients with recent immobilization (4.9%; 95% CI 4.3-5.6) than in those with surgery (1.4%; 95% CI 1.0-2.0) or those with neither (2.1%; 95% CI 1.8-2.3). On multivariate analysis, patients with immobilization were at increased risk for fatal PE (odds ratio 2.2; 95% CI 1.8-2.7), with no differences being seen between patients immobilized in hospital or in the community. CONCLUSIONS: Forty-three per cent of patients dying from PE had recent immobilization for 654 days. Many of these deaths could have been prevented

D-dimer levels and risk of recurrence following provoked venous thromboembolism: findings from the RIETE registry

Background: Patients with venous thromboembolism (VTE) secondary to transient risk factors may develop VTE recurrences after discontinuing anticoagulation. Identifying at-risk patients could help to guide the duration of therapy. Methods: We used the RIETE database to assess the prognostic value of d-dimer testing after discontinuing anticoagulation to identify patients at increased risk for recurrences. Transient risk factors were classified as major (postoperative) or minor (pregnancy, oestrogen use, immobilization or recent travel). Results: In December 2018, 1655 VTE patients with transient risk factors (major 460, minor 1195) underwent d-dimer measurements after discontinuing anticoagulation. Amongst patients with major risk factors, the recurrence rate was 5.74 (95% CI: 3.19\u20139.57) events per 100 patient-years in those with raised d-dimer levels and 2.68 (95% CI: 1.45\u20134.56) in those with normal levels. Amongst patients with minor risk factors, the rates were 7.79 (95% CI: 5.71\u201310.4) and 3.34 (95% CI: 2.39\u20134.53), respectively. Patients with major risk factors and raised d-dimer levels (n = 171) had a nonsignificantly higher rate of recurrences (hazard ratio [HR]: 2.14; 95% CI: 0.96\u20134.79) than those with normal levels. Patients with minor risk factors and raised d-dimer levels (n = 382) had a higher rate of recurrences (HR: 2.34; 95% CI: 1.51\u20133.63) than those with normal levels. On multivariate analysis, raised d-dimers (HR: 1.74; 95% CI: 1.09\u20132.77) were associated with an increased risk for recurrences in patients with minor risk factors, not in those with major risk factors. Conclusions: Patients with raised d-dimer levels after discontinuing anticoagulant therapy for VTE provoked by a minor transient risk factor were at an increased risk for recurrences

D-dimer levels and risk of recurrence following provoked venous thromboembolism: findings from the RIETE registry

BACKGROUND: Patients with venous thromboembolism (VTE) secondary to transient risk factors may develop VTE recurrences after discontinuing anticoagulation. Identifying at-risk patients could help to guide the duration of therapy. METHODS: We used the RIETE database to assess the prognostic value of d-dimer testing after discontinuing anticoagulation to identify patients at increased risk for recurrences. Transient risk factors were classified as major (postoperative) or minor (pregnancy, oestrogen use, immobilization or recent travel). RESULTS: In December 2018, 1655 VTE patients with transient risk factors (major 460, minor 1195) underwent d-dimer measurements after discontinuing anticoagulation. Amongst patients with major risk factors, the recurrence rate was 5.74 (95% CI: 3.19-9.57) events per 100 patient-years in those with raised d-dimer levels and 2.68 (95% CI: 1.45-4.56) in those with normal levels. Amongst patients with minor risk factors, the rates were 7.79 (95% CI: 5.71-10.4) and 3.34 (95% CI: 2.39-4.53), respectively. Patients with major risk factors and raised d-dimer levels (n = 171) had a nonsignificantly higher rate of recurrences (hazard ratio [HR]: 2.14; 95% CI: 0.96-4.79) than those with normal levels. Patients with minor risk factors and raised d-dimer levels (n = 382) had a higher rate of recurrences (HR: 2.34; 95% CI: 1.51-3.63) than those with normal levels. On multivariate analysis, raised d-dimers (HR: 1.74; 95% CI: 1.09-2.77) were associated with an increased risk for recurrences in patients with minor risk factors, not in those with major risk factors. CONCLUSIONS: Patients with raised d-dimer levels after discontinuing anticoagulant therapy for VTE provoked by a minor transient risk factor were at an increased risk for recurrences.status: publishe

Impact of sex, age, and risk factors for venous thromboembolism on the initial presentation of first isolated symptomatic acute deep vein thrombosis

BACKGROUND AND AIMS: Sex-specific differences exist for the initial presentation of acute venous thromboembolism (VTE): men are more likely to present with proximal deep vein thrombosis (DVT) in the lower limbs (versus pulmonary embolism [PE] or isolated distal DVT [IDDVT]) than women. We studied in detail the influence of sex, age, and VTE risk factors on the initial presentation of IDDVT versus proximal DVT. METHODS: A total of 24,911 patients with a first episode of objectively diagnosed acute symptomatic lower-limb DVT (without symptomatic PE) were enrolled in RIETE (years 2000-2017) and included in the present analysis. RESULTS: A total of 4266 (17.1%) patients had IDDVT. No trend for more IDDVT diagnoses was observed over time. Women aged 40-69 had a higher proportion of IDDVT, especially between 40 and 49 years (+6.7%; 95CI +3.7%; +9.9%), whereas men had more often proximal DVT. The presenting location of first acute DVT depended on sex, age, and the prevalence and type of VTE risk factors. Recent surgery was independently associated with a diagnosis of IDDVT in both women and men, whereas active cancer and pregnancy were associated with proximal DVT. CONCLUSIONS: The interaction between age and VTE risk factors influences the presenting location (distal versus proximal) of the first acute lower-limb DVT observed in women and men. Our observations extend to IDDVT the concept that different clinical manifestations of acute VTE may not fully share the same pathophysiological mechanisms: this contributes to explain sex-specific prognostic differences.status: publishe

Systolic blood pressure and mortality in acute symptomatic pulmonary embolism

BACKGROUND: The optimal cutoff for systolic blood pressure (SBP) level to define high-risk pulmonary embolism (PE) remains to be defined. METHODS: To evaluate the relationship between SBP levels on admission and mortality in patients with acute symptomatic PE, the current study included 39,257 consecutive patients with acute symptomatic PE from the RIETE registry between 2001 and 2018. Primary outcomes included all-cause and PE-specific 30-day mortality. Secondary outcomes included major bleeding and recurrent venous thromboembolism (VTE). RESULTS: There was a linear inverse relationship between admission SBP and 30-day all-cause and PE-related mortality that persisted after multivariable adjustment. Patients in the lower SBP strata had higher rates of all-cause death (reference: SBP 110-129 mmHg) (adjusted odds ratio [OR] 2.9; 95% confidence interval [CI], 2.0-4.2 for SBP 190 mmHg). Consistent findings were also observed for 30-day PE-related death. CONCLUSIONS: In patients with acute symptomatic PE, a low SBP portends an increased risk of all-cause and PE-related mortality. The highest mortality was observed in patients with SBP <70 mmHg.status: publishe