Large effect of titanium precursor on surface reactivity and mechanical strength of electrospun nanofibers coated with TiO2 by atomic layer deposition

2013 ◽  
Vol 31 (6) ◽  
pp. 061506 ◽  
Author(s):  
Christina D. McClure ◽  
Christopher J. Oldham ◽  
Howard J. Walls ◽  
Gregory N. Parsons
Keyword(s):  
Atomic Layer Deposition ◽  
Mechanical Strength ◽  
Electrospun Nanofibers ◽  
Atomic Layer ◽  
Surface Reactivity ◽  
Layer Deposition

Magnetic nanotubes obtained from atomic layer deposition coated electrospun nanofibers

2018 ◽  
Vol 36 (6) ◽  
pp. 061803 ◽  
Author(s):  
Alejandro Pereira ◽  
Juan Escrig ◽  
Juan Luis Palma ◽  
Carol López de Dicastillo ◽  
Cristian Patiño ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Electrospun Nanofibers ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Magnetic Nanotubes

Delayed Dissolution and Small Molecule Release from Atomic Layer Deposition Coated Electrospun Nanofibers

2015 ◽  
Vol 2 (18) ◽  
pp. 1500229 ◽  
Author(s):  
Nancy A. Vogel ◽  
Philip S. Williams ◽  
Alexandra H. Brozena ◽  
Dilara Sen ◽  
Sarah Atanasov ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Small Molecule ◽  
Electrospun Nanofibers ◽  
Atomic Layer ◽  
Layer Deposition

scholarly journals ZnO Nanostructures on Electrospun Nanofibers by Atomic Layer Deposition/Hydrothermal Growth and Their Photocatalytic Activity

2014 ◽  
Vol 1675 ◽  
pp. 9-14
Author(s):  
Fatma Kayaci ◽  
Sesha Vempati ◽  
Cagla Ozgit-Akgun ◽  
Necmi Biyikli ◽  
Tamer Uyar
Keyword(s):  
Photocatalytic Activity ◽  
Atomic Layer Deposition ◽  
Waste Water Treatment ◽  
Electrospun Nanofibers ◽  
Atomic Layer ◽  
Hydrothermal Growth ◽  
High Catalytic Activity ◽  
Potential Candidate ◽  
High Optical Quality ◽  
Layer Deposition

ABSTRACTA hierarchy of nanostructured-ZnO was fabricated on the electrospun nanofibers by atomic layer deposition (ALD) and hydrothermal growth, subsequently. Firstly, we produced poly(acrylonitrile) (PAN) nanofibers via electrospinning, then ALD process provided a highly uniform and conformal coating of polycrystalline ZnO with a precise control on the thickness (50 nm). In the last step, this ZnO coating depicting dominant oxygen vacancies and significant grain boundaries was used as a seed on which single crystalline ZnO nanoneedles (average diameter and length of ∼25 nm and ∼600 nm, respectively) with high optical quality were hydrothermally grown. The detailed morphological and structural studies were performed on the resulting nanofibers, and the photocatalytic activity (PCA) was tested with reference to the degradation of methylene blue. The results of PCA were discussed in conjunction with photoluminescence response. The nanoneedle structures supported the vectorial transport of photo-charge carriers, which is crucial for high catalytic activity. The enhanced PCA, structural stability and reusability of the PAN/ZnO nanoneedles indicated that this hierarchical structure is a potential candidate for waste water treatment.

scholarly journals Designing Nanoparticles and Nanoalloys for Gas-Phase Catalysis with Controlled Surface Reactivity Using Colloidal Synthesis and Atomic Layer Deposition

Molecules ◽  
2020 ◽  
Vol 25 (16) ◽  
pp. 3735
Author(s):  
Valentijn De Coster ◽  
Hilde Poelman ◽  
Jolien Dendooven ◽  
Christophe Detavernier ◽  
Vladimir V. Galvita
Keyword(s):  
Atomic Layer Deposition ◽  
Gas Phase ◽  
Atomic Layer ◽  
Catalytic Performance ◽  
Surface Reactivity ◽  
Catalyst Design ◽  
Atomic Scale ◽  
Colloidal Synthesis ◽  
Synthesis Techniques ◽  
Layer Deposition

Supported nanoparticles are commonly applied in heterogeneous catalysis. The catalytic performance of these solid catalysts is, for a given support, dependent on the nanoparticle size, shape, and composition, thus necessitating synthesis techniques that allow for preparing these materials with fine control over those properties. Such control can be exploited to deconvolute their effects on the catalyst’s performance, which is the basis for knowledge-driven catalyst design. In this regard, bottom-up synthesis procedures based on colloidal chemistry or atomic layer deposition (ALD) have proven successful in achieving the desired level of control for a variety of fundamental studies. This review aims to give an account of recent progress made in the two aforementioned synthesis techniques for the application of controlled catalytic materials in gas-phase catalysis. For each technique, the focus goes to mono- and bimetallic materials, as well as to recent efforts in enhancing their performance by embedding colloidal templates in porous oxide phases or by the deposition of oxide overlayers via ALD. As a recent extension to the latter, the concept of area-selective ALD for advanced atomic-scale catalyst design is discussed.

scholarly journals Formation and Photoluminescence Properties of ZnO Nanoparticles on Electrospun Nanofibers Produced by Atomic Layer Deposition

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1199 ◽  
Author(s):  
Valerii Myndrul ◽  
Lucie Vysloužilová ◽  
Andrea Klápšťová ◽  
Emerson Coy ◽  
Mariusz Jancelewicz ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Polyvinylidene Fluoride ◽  
Electrospun Nanofibers ◽  
Atomic Layer ◽  
Excitation Power ◽  
Electrospinning Technique ◽  
X Ray ◽  
Layer Deposition ◽  
Polymer Nanofiber ◽  
Wide Range

The unique combination of optical, chemical, and structural properties of one-dimensional zinc oxide (1D ZnO) makes it one of the most attractive materials in a wide range of research and applications. In the present study, 1D ZnO nanomaterials were fabricated using a combination of two independent methods: electrospinning and atomic layer deposition (ALD). The electrospinning technique was used to produce 1D electrospun fibers consisting of four types of polymers: polylactic acid (PLLA), polyvinylidene fluoride (PVDF), polyvinyl alcohol (PVA), and polyamide 6 (PA6). The ALD technology, in turn, was selected as an excellent candidate for the synthesis of a ZnO thin layer over polymer fibers for the production of 1D ZnO/polymer nanofiber composites (PLLA/ZnO, PVDF/ZnO, PVA/ZnO, PA6/ZnO). Structural and optical properties of the produced nanofibers were studied by means of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), diffuse reflectance, and photoluminescence (PL) spectroscopy. It was found that only PVDF/ZnO nanofibers exhibit stable room temperature PL that may be the result of a higher ZnO content in the sample. In addition, PL measurements were conducted as a function of excitation power and temperature in order to establish the main PL mechanisms and parameters for the PVDF/ZnO sample, as a most promising candidate for the biophotonic application.

Application of Atomic Layer Deposition in Dye-Sensitized Photoelectrosynthesis Cells

2021 ◽  
Vol 3 (1) ◽  
pp. 59-71
Author(s):  
Degao Wang ◽  
Qing Huang ◽  
Weiqun Shi ◽  
Wei You ◽  
Thomas J. Meyer
Keyword(s):  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Dye Sensitized ◽  
Layer Deposition

Workfunction of Al-Doped ZnO Films Deposited by Atomic Layer Deposition

2018 ◽  
Author(s):  
Peter George Gordon ◽  
Goran Bacic ◽  
Gregory P. Lopinski ◽  
Sean Thomas Barry
Keyword(s):  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Atomic Ratio ◽  
Aluminum Concentration ◽  
Zno Films ◽  
Transparent Conductor ◽  
Kelvin Probe ◽  
Layer Deposition ◽  
Earth Abundant ◽  
Doped Zno

Al-doped ZnO (AZO) is a promising earth-abundant alternative to Sn-doped In<sub>2</sub>O<sub>3</sub> (ITO) as an n-type transparent conductor for electronic and photovoltaic devices; AZO is also more straightforward to deposit by atomic layer deposition (ALD). The workfunction of this material is particularly important for the design of optoelectronic devices. We have deposited AZO films with resistivities as low as 1.1 x 10<sup>-3</sup> Ωcm by ALD using the industry-standard precursors trimethylaluminum (TMA), diethylzinc (DEZ), and water at 200<sup>◦</sup>C. These films were transparent and their elemental compositions showed reasonable agreement with the pulse program ratios. The workfunction of these films was measured using a scanning Kelvin Probe (sKP) to investigate the role of aluminum concentration. In addition, the workfunction of AZO films prepared by two different ALD recipes were compared: a “surface” recipe wherein the TMA was pulsed at the top of each repeating AZO stack, and a interlamellar recipe where the TMA pulse was introduced halfway through the stack. As aluminum doping increases, the surface recipe produces films with a consistently higher workfunction as compared to the interlamellar recipe. The resistivity of the surface recipe films show a minimum at a 1:16 Al:Zn atomic ratio and using an interlamellar recipe, minimum resistivity was seen at 1:19. The film thicknesses were characterized by ellipsometry, chemical composition by EDX, and resistivity by four-point probe.<br>

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