Kooperativer Bibliotheksverbund

In: FlatChem, Elsevier BV, Vol. 21 ( 2020-05), p. 100166-

Type of Medium: Online Resource

ISSN: 2452-2627

URL: Article

DOI: 10.1016/j.flatc.2020.100166

Language: English

Publisher: Elsevier BV

Publication Date: 2020

detail.hit.zdb_id: 2873498-1

In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2017-02, No. 25 ( 2017-09-01), p. 1104-1104

Abstract: Development of advanced types of solar cells has tremendously accelerated in recent years all activities in the photovoltaics (PVs) driven by the needs to produce solar panels with as high efficiency as possible at lowest cost possible [1]. Realizing that classical silicon solar cells have their limits, such as poor function at low light intensities, lots of research has been carried out past two decades towards alternative technologies based on thin film solar cells (amorphous Si-H, CIGS, CdTe) [2] , perovskite cells [3], dye-sensitized cells [4] , and organic cells [5]. Even though, the overall efficiencies of advanced photovoltaic devices have grown up significantly (and this goes hand in hand with the development of production technologies), there is so far no solar cell that would have reliable stability and performance over many years of the cell service, that would be cheap, environmentally reasonable and potentially flexible. One of most competing technologies to silicon solar cells, when considering the efficiency, low-cost production and stability is based on thin films of semiconducting chalcogenides, such as Cu(In,Ga)Se 2 (CIGS) [6,7] and Cu 2 ZnSn(Se,S) 4 (CZTS) [8]. Both became recently materials of the choice as they represent in thin film solar cells chromophores of adjustable band gaps, good radiation stability and high optical absorption coefficient. For solution processed CIGS and CZTS thin film PVs cells, however, the limiting factors for further enhancement of the conversion efficiency involve the shape, size and grain boundaries of the chromophore films. The film morphology, defects and character of the grain boundaries predetermine the mobility (the loss) of free carriers in the chromophore film resulting in conversion efficiency maximum beyond ~11 % for CZTS materials and multilayer solar cell design [8]. One of the possible solutions how to improve the carrier mobility of semiconducting chalcogenides to the highest possible level is to use hybrid photocells employing a highly ordered TiO 2 nanotube film /chromophore interface. However, the major issue to extend the functional range of nanotubes is to coat homogenously tube interiors by semiconducting chalcogenides in order to achieve the best possible contact of both components on their interface. This is especially crucial when high aspect ratio semiconducting TiO 2 nanotube arrays are utilized [9, 10] and thus the Atomic Layer Deposition technique becomes beneficial. The presentation will show initial photo-electrochemical results for anodic TiO 2 nanotubes employed as highly ordered electron-conductive supports for host materials coated using ALD with secondary materials to enhance light absorbing capabilities of such hybrid systems. We will focus on all ALD photo-electrochemical devices based on inorganic chalcogenides [11] .   References 1. A. Jäger-Waldau, PV Status Report 2013 , Joint Research Center, European Commission. 2. M. Konagai, Jap. J. App. Phys. 50 (2011) 030001. 3. P. P. Boix, K. Nonomura, N. Mathews, S. G. Mhaisalkar, Materials Today 17 (2014) 16. 4. B. O´Regan and M. Grätzel, Nature 353 (1991) 737. 5. C. J. Brabec, N. S. Sariciftci, J. C. Hummelen, Adv. Funct. Mater. 11 (2001) 15. 6. K. Ramanathan, et al., Progress in Photovoltaics: Research and Applications 11 (2003) 225. 7. I. Repins, et al., Progress in Photovoltaics: Research and Applications 16 (2008) 235. 8. T. K. Todorov et al., Adv. Energy Mater. , 4 (2013) 34. 9. J. M. Macak et al., Curr. Opin. Solid State Mater. Sci. 1-2 (2007) 3. 10. R. Zazpe et al., Langmuir , 32 (2016) 10551. 11. M. Krbal et al., Ms in preparation.

Type of Medium: Online Resource

ISSN: 2151-2043

URL: Article

DOI: 10.1149/MA2017-02/25/1104

Language: Unknown

Publisher: The Electrochemical Society

Publication Date: 2017

detail.hit.zdb_id: 2438749-6

In: Trials, Springer Science and Business Media LLC, Vol. 22, No. 1 ( 2021-12)

Abstract: The primary objective of this study is to test the hypothesis that administration of dexamethasone 20 mg is superior to a 6 mg dose in adult patients with moderate or severe ARDS due to confirmed COVID-19. The secondary objective is to investigate the efficacy and safety of dexamethasone 20 mg versus dexamethasone 6 mg. The exploratory objective of this study is to assess long-term consequences on mortality and quality of life at 180 and 360 days. Trial design REMED is a prospective, phase II, open-label, randomised controlled trial testing superiority of dexamethasone 20 mg vs 6 mg. The trial aims to be pragmatic, i.e. designed to evaluate the effectiveness of the intervention in conditions that are close to real-life routine clinical practice. Participants The study is multi-centre and will be conducted in the intensive care units (ICUs) of ten university hospitals in the Czech Republic. Inclusion criteria Subjects will be eligible for the trial if they meet all of the following criteria: 1. Adult (≥18 years of age) at time of enrolment; 2. Present COVID-19 (infection confirmed by RT-PCR or antigen testing); 3. Intubation/mechanical ventilation or ongoing high-flow nasal cannula (HFNC) oxygen therapy; 4. Moderate or severe ARDS according to Berlin criteria:  • Moderate – PaO 2 /FiO 2 100–200 mmHg;  • Severe – PaO 2 /FiO 2 〈 100 mmHg; 5. Admission to ICU in the last 24 hours. Exclusion criteria Subjects will not be eligible for the trial if they meet any of the following criteria: 1. Known allergy/hypersensitivity to dexamethasone or excipients of the investigational medicinal product (e.g. parabens, benzyl alcohol); 2. Fulfilled criteria for ARDS for ≥14 days at enrolment; 3. Pregnancy or breastfeeding; 4. Unwillingness to comply with contraception measurements from enrolment until at least 1 week after the last dose of dexamethasone (sexual abstinence is considered an adequate contraception method); 5. End-of-life decision or patient is expected to die within next 24 hours; 6. Decision not to intubate or ceilings of care in place; 7. Immunosuppression and/or immunosuppressive drugs in medical history:  a) Systemic immunosuppressive drugs or chemotherapy in the past 30 days;  b) Systemic corticosteroid use before hospitalization;  c) Any dose of dexamethasone during the present hospital stay for COVID-19 for ≥5 days before enrolment;  d) Systemic corticosteroids during present hospital stay for conditions other than COVID-19 (e.g. septic shock); 8. Current haematological or generalized solid malignancy; 9. Any contraindication for corticosteroid administration, e.g.  • intractable hyperglycaemia;  • active gastrointestinal bleeding;  • adrenal gland disorders;  • presence of superinfection diagnosed with locally established clinical and laboratory criteria without adequate antimicrobial treatment; 10. Cardiac arrest before ICU admission; 11. Participation in another interventional trial in the last 30 days. Intervention and comparator Dexamethasone solution for injection/infusion is the investigational medicinal product as well as the comparator. The trial will assess two doses, 20 mg (investigational) vs 6 mg (comparator). Patients in the intervention group will receive dexamethasone 20 mg intravenously once daily on day 1–5, followed by dexamethasone 10 mg intravenously once daily on day 6–10. Patients in the control group will receive dexamethasone 6 mg day 1–10. All authorized medicinal products containing dexamethasone in the form of solution for i.v. injection/infusion can be used. Main outcomes Primary endpoint: Number of ventilator-free days (VFDs) at 28 days after randomisation, defined as being alive and free from mechanical ventilation. Secondary endpoints a) Mortality from any cause at 60 days after randomisation; b) Dynamics of inflammatory marker (C-Reactive Protein, CRP) change from Day 1 to Day 14; c) WHO Clinical Progression Scale at Day 14; d) Adverse events related to corticosteroids (new infections, new thrombotic complications) until Day 28 or hospital discharge; e) Independence at 90 days after randomisation assessed by Barthel Index. The long-term outcomes of this study are to assess long-term consequences on mortality and quality of life at 180 and 360 days through telephone structured interviews using the Barthel Index. Randomisation Randomisation will be carried out within the electronic case report form (eCRF) by the stratified permuted block randomisation method. Allocation sequences will be prepared by a statistician independent of the study team. Allocation to the treatment arm of an individual patient will not be available to the investigators before completion of the whole randomisation process. The following stratification factors will be applied: • Age 〈 65 and ≥ 65; • Charlson Comorbidity index (CCI) 〈 3 and ≥3; • CRP 〈 150 mg/L and ≥150 mg/L • Trial centre. Patients will be randomised in a 1 : 1 ratio into one of the two treatment arms. Randomisation through the eCRF will be available 24 hours every day. Blinding (masking) This is an open-label trial in which the participants and the study staff will be aware of the allocated intervention. Blinded pre-planned statistical analysis will be performed. Numbers to be randomised (sample size) The sample size is calculated to detect the difference of 3 VFDs at 28 days (primary efficacy endpoint) between the two treatment arms with a two-sided type I error of 0.05 and power of 80%. Based on data from a multi-centre randomised controlled trial in COVID-19 ARDS patients in Brazil and a multi-centre observational study from French and Belgian ICUs regarding moderate to severe ARDS related to COVID-19, investigators assumed a standard deviation of VFD at 28 days as 9. Using these assumptions, a total of 142 patients per treatment arm would be needed. After adjustment for a drop-out rate, 150 per treatment arm (300 patients per study) will be enrolled. Trial Status This is protocol version 1.1, 15.01.2021. The trial is due to start on 2 February 2021 and recruitment is expected to be completed by December 2021. Trial registration The study protocol was registered on EudraCT No.:2020-005887-70, and on December 11, 2020 on ClinicalTrials.gov (Title: Effect of Two Different Doses of Dexamethasone in Patients With ARDS and COVID-19 (REMED)) Identifier: NCT04663555 with a last update posted on February 1, 2021. Full protocol The full protocol (version 1.1) is attached as an additional file, accessible from the Trials website (Additional file 1). In the interest of expediting dissemination of this material, the standard formatting has been eliminated; this Letter serves as a summary of the key elements of the full protocol.

Type of Medium: Online Resource

ISSN: 1745-6215

URL: Article

DOI: 10.1186/s13063-021-05116-9

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2021

detail.hit.zdb_id: 2040523-6

In: Advanced Materials Interfaces, Wiley, Vol. 5, No. 3 ( 2018-02)

Abstract: Ultrathin molybdenum oxyselenide (MoSe x O y ) coatings are made first ever by atomic layer deposition (ALD) within anodic 1D TiO 2 nanotube layers for photoelectrochemical and photocatalytic applications. The coating thickness is controlled through varying ALD cycles from 5 to 50 cycles (corresponding to ≈1–10 nm). In the ultraviolet region, the coatings have enhanced up to four times the incident photon‐to‐current conversion efficiency (IPCE), and the highest IPCE is recorded at 32% at (at λ = 365 nm). The coatings notably extend the photoresponse to the visible spectral region and remarkable improvement of photocurrent densities up to ≈40 times is registered at λ = 470 nm. As a result, the MoSe x O y ‐coated‐TiO 2 nanotube layers have shown to be an effective photocatalyst for methylene blue degradation, and the optimal performance is credited to a coating thickness between 2 and 5 nm (feasible only by ALD). The enhancement in photoactivities of the presented heterojunction is mainly associated with the passivation effect of MoSe x O y on the TiO 2 nanotube walls and the suitability of bandgap position between MoSe x O y and TiO 2 interface for an efficient charge transfer. In addition, MoSe x O y possesses a narrow bandgap, which favors the photoactivity in the visible spectral region.

Type of Medium: Online Resource

ISSN: 2196-7350 , 2196-7350

URL: Issue

URL: Article

DOI: 10.1002/admi.v5.3

DOI: 10.1002/admi.201701146

Language: English

Publisher: Wiley

Publication Date: 2018

detail.hit.zdb_id: 2750376-8

In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2019-02, No. 24 ( 2019-09-01), p. 1149-1149

Abstract: The success of graphene opened a door for a new class of chalcogenide materials with unique properties that can be applied in the semiconductor technology [1]. Monolayers of two-dimensional transition metal dichalcogenides (2D TMDCs) possess a direct band gap [2] that is crucial for optoelectronic applications. Additionally, the direct band gap can be easily tuned by either chemical composition or external stimuli. Next to the optoelectronic applications, where a monolayer planar structure is necessary to employ, a layer of standing flakes, which possesses a large surface area, can be used for hydrogen evolution [3] a photodegradation of organic dyes [4] or as electrodes in Li ion batteries [5]. In principle, TMDCs can be prepared by various top-down (e.g. exfoliation) and bottom-up techniques, such as chemical vapor deposition (CVD) and atomic layer deposition (ALD) growth techniques [1]. MoS 2 , a typical representative of TMDCs, has been widely studied for many applications. Recently, the possibility to employ ALD as a technique to grow MoS2 has been reported. In these works (CH3)2S2 [6] or H2S [7, 8] were used as the S precursor and Mo(CO)6 [6], MoCl5 [7] or Mo(thd)3 [8] as the Mo precursors. From the practical point of view, MoSe2 is even more interesting than MoS2 since MoSe2 possesses a higher electrical conductivity than MoS2 [9, 10] . Recently, we have shown that ALD deposition of MoSe2 [11] or Mo-O-Se [12] using ((CH3)3Si)2Se as the Se precursor and the MoCl5 or Mo(CO)6, respectively, as the Mo precursors is feasible. The presentation will focus on the synthesis of MoS 2 and MoSe 2 by ALD, their characterization and applications in various fields. Experimental details and some recent photocatalytic and hydrogen evolution results will be presented and discussed. References: [1] A. V. Kolobov, J. Tominaga, Two-Dimensional Transition-Metal, Dichalcogenides . Springer Series in Materials Science, Springer International Publishing AG, Switzerland 2016 [2] B. Radisavljevic, A. Radenovic, J. Brivio, V. Giacometti, A. Kis, Nat. Nanotechnol . 2011 , 6 , 147. [3] L. Wang, Z. Sofer, J. Luxa, M. Pumera, Adv. Mater. Interfaces 2015 , 2 , 1500041 [4] Y. Wu, M. Xu, X. Chen, S. Yang, H. Wu, J. Pan, X. Xiong, Nanoscale 2016 , 8 , 440 [5] D. Ilic, K. Wiesener, W. Schneider, H. Oppermann, G. Krabbes, J.Power Sources 1985 , 14 , 223 [6] Z. Jin, S.Shin,D.H.Kwon, S. J.Han,Y. S.Min, Nanoscale 2014 , 6 , 14453. [7] L. K. Tan, B. Liu, J. H. Teng, S. Guo, H. Y. Low, K. P. Loh, Nanoscale 2014 , 6 , 10584 [8] M. Mattinen et al., Adv. Mater. Interfaces 2017 , 4 , 1700123. [9] D. Kong, H. Wang, J. J. Cha, M. Pasta, K. J. Koski, J. Yao, Y. Cui, Nano Lett . 2013 , 13 , 1341. [10] A. Eftekhari, Appl. Mater. Today 2017 , 8 . [11] M. Krbal et al., Phys. Stat. Sol . RRL, 2018 , 12 , 1800023 [12] S. Ng et al., Adv. Mater. Interfaces 2017 , 1701146.

Type of Medium: Online Resource

ISSN: 2151-2043

URL: Article

DOI: 10.1149/MA2019-02/24/1149

Language: Unknown

Publisher: The Electrochemical Society

Publication Date: 2019

detail.hit.zdb_id: 2438749-6

In: Applied Materials Today, Elsevier BV, Vol. 14 ( 2019-03), p. 1-20

Type of Medium: Online Resource

ISSN: 2352-9407

URL: Article

DOI: 10.1016/j.apmt.2018.11.005

Language: English

Publisher: Elsevier BV

Publication Date: 2019

detail.hit.zdb_id: 2833442-5

In: physica status solidi (RRL) – Rapid Research Letters, Wiley, Vol. 12, No. 5 ( 2018-05)

Abstract: Here, we demonstrate the preparation of 2D MoSe 2 structures by the atomic layer deposition technique. In this work, we use ((CH 3 ) 3 Si) 2 Se as the Se precursor and Mo(CO) 6 or MoCl 5 as the Mo precursors. The X‐ray photoelectron spectroscopy (XPS) analyses of the prepared samples have revealed that using the MoCl 5 precursor the obtained structure of MoSe 2 is nearly identical to the reference powder MoSe 2 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 MoSe 2 structure based on MoCl 5 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 .

Type of Medium: Online Resource

ISSN: 1862-6254 , 1862-6270

URL: Issue

URL: Article

DOI: 10.1002/pssr.v12.5

DOI: 10.1002/pssr.201800023

Language: English

Publisher: Wiley

Publication Date: 2018

detail.hit.zdb_id: 2259465-6

In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2019-01, No. 12 ( 2019-05-01), p. 837-837

Abstract: The success of graphene opened a door for a new class of chalcogenide materials with unique properties that can be applied in the semiconductor technology [1]. Monolayers of two-dimensional transition metal dichalcogenides (2D TMDCs) possess a direct band gap [2] that is crucial for optoelectronic applications. Additionally, the direct band gap can be easily tuned by either chemical composition or external stimuli. Next to the optoelectronic applications, where a monolayer planar structure is necessary to employ, a layer of standing flakes, which possesses a large surface area, can be used for hydrogen evolution [3] a photodegradation of organic dyes [4] or as electrodes in Li ion batteries [5]. In principle, TMDCs can be prepared by various top-down (e.g. exfoliation) and bottom-up techniques, such as chemical vapor deposition (CVD) and atomic layer deposition (ALD) growth techniques [1]. MoS 2 , a typical representative of TMDCs, has been widely studied for many applications. Recently, the possibility to employ ALD as a technique to grow MoS2 has been reported. In these works (CH3)2S2 [6] or H2S [7, 8] were used as the S precursor and Mo(CO)6 [6], MoCl5 [7] or Mo(thd)3 [8] as the Mo precursors. From the practical point of view, MoSe2 is even more interesting than MoS2 since MoSe2 possesses a higher electrical conductivity than MoS2 [9, 10] . Recently, we have shown that ALD deposition of MoSe2 [11] or Mo-O-Se [12] using ((CH3)3Si)2Se as the Se precursor and the MoCl5 or Mo(CO)6, respectively, as the Mo precursors is feasible. The presentation will focus on the synthesis of MoS 2 and MoSe 2 by ALD, their characterization and applications in various fields. Experimental details and some recent photocatalytic and hydrogen evolution results will be presented and discussed. References: [1] A. V. Kolobov, J. Tominaga, Two-Dimensional Transition-Metal, Dichalcogenides . Springer Series in Materials Science, Springer International Publishing AG, Switzerland 2016 [2] B. Radisavljevic, A. Radenovic, J. Brivio, V. Giacometti, A. Kis, Nat. Nanotechnol . 2011 , 6 , 147. [3] L. Wang, Z. Sofer, J. Luxa, M. Pumera, Adv. Mater. Interfaces 2015 , 2 , 1500041 [4] Y. Wu, M. Xu, X. Chen, S. Yang, H. Wu, J. Pan, X. Xiong, Nanoscale 2016 , 8 , 440 [5] D. Ilic, K. Wiesener, W. Schneider, H. Oppermann, G. Krabbes, J.Power Sources 1985 , 14 , 223 [6] Z. Jin, S.Shin,D.H.Kwon, S. J.Han,Y. S.Min, Nanoscale 2014 , 6 , 14453. [7] L. K. Tan, B. Liu, J. H. Teng, S. Guo, H. Y. Low, K. P. Loh, Nanoscale 2014 , 6 , 10584 [8] M. Mattinen et al., Adv. Mater. Interfaces 2017 , 4 , 1700123. [9] D. Kong, H. Wang, J. J. Cha, M. Pasta, K. J. Koski, J. Yao, Y. Cui, Nano Lett . 2013 , 13 , 1341. [10] A. Eftekhari, Appl. Mater. Today 2017 , 8 . [11] M. Krbal et al., Phys. Stat. Sol . RRL, 2018 , 12 , 1800023 [12] S. Ng et al., Adv. Mater. Interfaces 2017 , 1701146.

Type of Medium: Online Resource

ISSN: 2151-2043

URL: Article

DOI: 10.1149/MA2019-01/12/837

Language: Unknown

Publisher: The Electrochemical Society

Publication Date: 2019

detail.hit.zdb_id: 2438749-6

In: Optical Materials, Elsevier BV, Vol. 69 ( 2017-07), p. 312-317

Type of Medium: Online Resource

ISSN: 0925-3467

URL: Article

DOI: 10.1016/j.optmat.2017.04.059

Language: English

Publisher: Elsevier BV

Publication Date: 2017

detail.hit.zdb_id: 1105129-2

detail.hit.zdb_id: 2015659-5

In: Tetrahedron, Elsevier BV, Vol. 75, No. 34 ( 2019-08), p. 130459-

Type of Medium: Online Resource

ISSN: 0040-4020

URL: Article

DOI: 10.1016/j.tet.2019.07.017

Language: English

Publisher: Elsevier BV

Publication Date: 2019

detail.hit.zdb_id: 2007072-X