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Journal articles on the topic 'TiO2 nanocolumns'

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Author: Grafiati
Published: 25 May 2024

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1

Rosales Medina, Perla Yanet, Fernando Avelar Muñoz, Elida Flores Sigala, Roberto Gómez Rosales, Javier Alejandro Berumen Torres, José de Jesús Araiza Ibarra, Hugo Tototzintle Huitle, Víctor Hugo Méndez García, and José Juan Ortega Sigala. "Growth of Nanocolumnar TiO2 Bilayer by Direct Current Reactive Magnetron Sputtering in Glancing-Angle Deposition Configuration for High-Quality Electron Transport Layer." Micromachines 14, no. 8 (July 25, 2023): 1483. http://dx.doi.org/10.3390/mi14081483.

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The electron transport layer (ETL) plays a crucial role in solar cell technology, particularly in perovskite solar cells (PSCs), where nanostructured TiO2 films have been investigated as superior ETLs compared to compact TiO2. In this study, we explored the nanocolumnar growth of TiO2 in the anatase phase for bilayer thin films by DC reactive magnetron sputtering (MS) technique and glancing-angle deposition (GLAD). For the growth of the compact TiO2 layer, it was found that the crystalline quality of the films is strongly dependent on the sputtering power, and the samples deposited at 120 and 140 W are those with the best crystalline quality. However, for the nanocolumnar layer, the reactive atmosphere composition determined the best crystalline properties. By optimizing the growth parameters, the formation of TiO2 nanocolumns with a cross-sectional diameter ranging from 50 to 75 nm was achieved. The average thickness of the films exceeded 12.71 ± 0.5 µm. All nanostructured films were grown at a constant GLAD angle of 70°, and after deposition, the measured inclination angle of the nanocolumns is very close to this, having values between 68 and 80°. Furthermore, a correlation was observed between the quality of the initial layer and the enhanced growth of the TiO2 nanocolumns. All bilayer films are highly transparent, allowing light to pass through up to 90%, and present a band gap with values between 3.7 and 3.8 eV. This article offers the experimental parameters for the fabrication of a nanocolumnar TiO2 using the magnetron sputtering technique and the glancing-angle deposition configuration.
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2

Xu, Jinghan, Yanqi Liu, and Yan Zhao. "Effect of Ag loading position on the photocatalytic performance of TiO2 nanocolumn arrays." Beilstein Journal of Nanotechnology 11 (May 5, 2020): 717–28. http://dx.doi.org/10.3762/bjnano.11.59.

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Plasmonic metal/semiconductor composites have attracted great attention for efficient solar energy harvesting in photovoltaic and photocatalytic applications owing to their extremely high visible-light absorption and tuned effective band gap. In this work, Ag-loaded TiO2 nanocolumn (Ag-TNC) arrays were fabricated based on anodic aluminum oxide (AAO) template by combining atomic layer deposition (ALD) and vacuum evaporation. The effects of the Ag loading position and deposition thickness, and the morphology, structure and composition of Ag-deposited TNC arrays on its optical and photocatalytic properties were studied. The Ag-filled TiO2 (AFT) nanocolumn arrays exhibited higher removal efficiency of methylene blue (MB) compared with Ag-coated TiO2 (ACT) nanocolumn arrays and pure TiO2 nanocolumns arrays. Both experimental and theoretical simulation results demonstrated that the enhanced photocatalytic performance of AFT nanocolumn arrays was attributed to the surface plasmon resonance (SPR) of Ag and the absorption of light by TiO2. These results represent a promising step forward to the development of high-performance photocatalysts for energy conversion and storage.
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3

Siewert, Joshua Morgan Arthur, Joshua Michael LaForge, Michael Thomas Taschuk, and Michael Julian Brett. "Disassembling Glancing Angle Deposited Films for High-Throughput, Single-Post Growth Scaling Measurements." Microscopy and Microanalysis 18, no. 5 (October 2012): 1135–42. http://dx.doi.org/10.1017/s1431927612001080.

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AbstractWith growing interest in nanostructured thin films produced by glancing angle deposition (GLAD), it becomes increasingly important to understand their overall growth mechanics and nanocolumn structure. We present a new method of isolating the individual nanocolumns of GLAD films, facilitating automated measurement of their broadening profiles. Data collected for α = 81° TiO2 vertical nanocolumns deposited across a range of substrate rotation rates demonstrates that these rates influence growth scaling parameters. Further, individual posts were found in each case that violate predicted Kardar-Parisi-Zhang growth scaling limits. The technique's current iteration is comparable to existing techniques in speed: though data were studied from 10,756 individual objects, the majority could not be confidently used in subsequent analysis. Further refinement may allow high-throughput automated film characterization and permit close examination of subtle growth trends, potentially enhancing control over GLAD film broadening and morphology.
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4

Ruff, T., R. Hahn, and P. Schmuki. "From anodic TiO2 nanotubes to hexagonally ordered TiO2 nanocolumns." Applied Surface Science 257, no. 19 (July 2011): 8177–81. http://dx.doi.org/10.1016/j.apsusc.2011.03.050.

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5

Sepúlveda, M., J. G. Castaño, and F. Echeverría. "Fabrication of highly-ordered TiO2 nanocolumns by two-step anodizing of an Al/Ti layer in etidronic acid." Materials Chemistry and Physics 216 (September 2018): 51–57. http://dx.doi.org/10.1016/j.matchemphys.2018.05.080.

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6

Horide, Tomoya, Hiromu Katagiri, Ataru Ichinose, and Kaname Matsumoto. "Fabrication of Fe(Te,Se) films added with oxide or chalcogenide: Influence of added material on phase formation and superconducting properties." Journal of Applied Physics 131, no. 10 (March 14, 2022): 103901. http://dx.doi.org/10.1063/5.0085234.

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Incorporation of a dopant, an impurity, and a non-superconducting second phase in superconducting films is an important approach to control the superconducting property. In spite of extensive studies on the oxide superconducting nanocomposite films, the influence of additive materials on the phase formation and nanostructure is unclear in the iron based superconducting chalcogenide, Fe(Te,Se). Here, the incorporation of oxide or chalcogenide in Fe(Te,Se) films using pulsed laser deposition was investigated. When TiO2, Fe2O3, Yb2O3, CeO2, Nb2O5, SnSe, or SnTe was added, c axis oriented Fe(Te,Se) films were not formed. On the other hand, c axis oriented Fe(Te,Se) films were obtained when SrTiO3 was added at the content of 3–10 areal% and the deposition temperature of 400–550 °C. While a characteristic nanostructure originating from SrTiO3 was not observed for the small SrTiO3 content (3%), the nanocomposite structure comprising of nanocolumns was formed for the large SrTiO3 content (10%). The critical temperature was 8.2–8.6 K in the Fe(Te,Se) + SrTiO3(3%) thin films deposited at 500 °C, while the critical temperature was ∼10 K in the Fe(Te,Se) films. The irreversibility curve behavior was varied by the structural change in the natural pinning centers, which resulted from the SrTiO3 addition, while the pinning effect by the nanocomposite structure was concealed by the Tc degradation in the case of the large amount of SrTiO3 addition. Considering the dependence of the film structure on the additive material and the incorporation content, the superconducting properties of Fe(Te,Se) films should be designed.
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7

Marik, M., A. Mozalev, J. Hubalek, and M. Bendova. "Resistive switching in TiO2 nanocolumn arrays electrochemically grown." Journal of Physics: Conference Series 829 (April 21, 2017): 012001. http://dx.doi.org/10.1088/1742-6596/829/1/012001.

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8

Ramos, F. Javier, Manuel Oliva-Ramirez, Mohammad Khaja Nazeeruddin, Michael Grätzel, Agustín R. González-Elipe, and Shahzada Ahmad. "Nanocolumnar 1-dimensional TiO2 photoanodes deposited by PVD-OAD for perovskite solar cell fabrication." Journal of Materials Chemistry A 3, no. 25 (2015): 13291–98. http://dx.doi.org/10.1039/c5ta02238j.

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9

Letertre, Laurie, Roland Roche, Olivier Douhéret, Hailu G. Kassa, Denis Mariolle, Nicolas Chevalier, Łukasz Borowik, et al. "A scanning probe microscopy study of nanostructured TiO2/poly(3-hexylthiophene) hybrid heterojunctions for photovoltaic applications." Beilstein Journal of Nanotechnology 9 (August 1, 2018): 2087–96. http://dx.doi.org/10.3762/bjnano.9.197.

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The nanoscale morphology of photoactive hybrid heterojunctions plays a key role in the performances of hybrid solar cells. In this work, the heterojunctions consist of a nanocolumnar TiO2 surface covalently grafted with a monolayer of poly(3-hexylthiophene) (P3HT) functionalized with carboxylic groups (–COOH). Through a joint analysis of the photovoltaic properties at the nanoscale by photoconductive-AFM (PC-AFM) and surface photovoltage imaging, we investigated the physical mechanisms taking place locally during the photovoltaic process and the correlation to the nanoscale morphology. A down-shift of the vacuum level of the TiO2 surface upon grafting was measured by Kelvin probe force microscopy (KPFM), evidencing the formation of a dipole at the TiO2/P3HT-COOH interface. Upon in situ illumination, a positive photovoltage was observed as a result of the accumulation of photogenerated holes in the P3HT layer. A positive photocurrent was recorded in PC-AFM measurements, whose spatial mapping was interpreted consistently with the corresponding KPFM analysis, offering a correlated analysis of interest from both a theoretical and material design perspective.
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10

Hu, Zhelu, José Miguel García-Martín, Yajuan Li, Laurent Billot, Baoquan Sun, Fernando Fresno, Antonio García-Martín, María Ujué González, Lionel Aigouy, and Zhuoying Chen. "TiO2 Nanocolumn Arrays for More Efficient and Stable Perovskite Solar Cells." ACS Applied Materials & Interfaces 12, no. 5 (January 13, 2020): 5979–89. http://dx.doi.org/10.1021/acsami.9b21628.

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11

Parra-Barranco, Julian, Carmen Lopez-Santos, Juan R. Sánchez-Valencia, Ana Borras, Agustin R. Gonzalez-Elipe, and Angel Barranco. "Mechanically Switchable Wetting Petal Effect in Self-Patterned Nanocolumnar Films on Poly(dimethylsiloxane)." Nanomaterials 11, no. 10 (September 29, 2021): 2566. http://dx.doi.org/10.3390/nano11102566.

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Switchable mechanically induced changes in the wetting behavior of surfaces are of paramount importance for advanced microfluidic, self-cleaning and biomedical applications. In this work we show that the well-known polydimethylsiloxane (PDMS) elastomer develops self-patterning when it is coated with nanostructured TiO2 films prepared by physical vapor deposition at glancing angles and subsequently subjected to a mechanical deformation. Thus, unlike the disordered wrinkled surfaces typically created by deformation of the bare elastomer, well-ordered and aligned micro-scaled grooves form on TiO2/PDMS after the first post-deposition bending or stretching event. These regularly patterned surfaces can be reversibly modified by mechanical deformation, thereby inducing a switchable and reversible wetting petal effect and the sliding of liquid droplets. When performed in a dynamic way, this mechanical actuation produces a unique capacity of liquid droplets (water and diiodomethane) transport and tweezing, this latter through their selective capture and release depending on their volume and chemical characteristics. Scanning electron and atomic force microscopy studies of the strained samples showed that a dual-scale roughness, a parallel alignment of patterned grooves and their reversible widening upon deformation, are critical factors controlling this singular sliding behavior and the possibility to tailor their response by the appropriate manufacturing of surface structures.
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12

Mayrhofer, P. H., C. Mitterer, J. G. Wen, J. E. Greene, and I. Petrov. "Self-organized nanocolumnar structure in superhard TiB2 thin films." Applied Physics Letters 86, no. 13 (March 28, 2005): 131909. http://dx.doi.org/10.1063/1.1887824.

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13

Bendova, Maria, Jakub Kolar, Marian Marik, Tomas Lednicky, and Alexander Mozalev. "Influence of nitrogen species on the porous-alumina-assisted growth of TiO2 nanocolumn arrays." Electrochimica Acta 281 (August 2018): 796–809. http://dx.doi.org/10.1016/j.electacta.2018.05.197.

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14

Feng, Hao-Che, and Kao-Shuo Chang. "Characterization of Sputtered HfO2−x –TiO2−x Nanocolumn Arrays and Their Application in Photocatalysis." Journal of Electronic Materials 46, no. 7 (March 23, 2017): 4532–38. http://dx.doi.org/10.1007/s11664-017-5434-8.

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15

Jiménez-Piqué, E., L. González-García, V. J. Rico, and A. R. González-Elipe. "Nanoindentation of nanocolumnar TiO2 thin films with single and stacked zig-zag layers." Thin Solid Films 550 (January 2014): 444–49. http://dx.doi.org/10.1016/j.tsf.2013.10.022.

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16

González-García, Lola, Irene González-Valls, Mónica Lira-Cantu, Angel Barranco, and Agustín R. González-Elipe. "Aligned TiO2 nanocolumnar layers prepared by PVD-GLAD for transparent dye sensitized solar cells." Energy & Environmental Science 4, no. 9 (2011): 3426. http://dx.doi.org/10.1039/c0ee00489h.

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17

Roa, J. J., V. Rico, M. Oliva-Ramírez, A. R. González-Elipe, and E. Jiménez-Piqué. "Nanoindentation and scratch resistance of multilayered TiO2-SiO2coatings with different nanocolumnar structures deposited by PV-OAD." Journal of Physics D: Applied Physics 49, no. 13 (February 29, 2016): 135104. http://dx.doi.org/10.1088/0022-3727/49/13/135104.

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18

Alvarez, Rafael, Aurelio Garcia-Valenzuela, Guillermo Regodon, Francisco Javier Ferrer, Victor J. Rico, Jose Miguel Garcia-Martin, Agustin Rodriguez Gonzalez-Elipe, and Alberto Palmero. "Growth dynamics of nanocolumnar thin films deposited by magnetron sputtering at oblique angles." Nanotechnology, November 30, 2023. http://dx.doi.org/10.1088/1361-6528/ad113d.

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Abstract The morphology of numerous nanocolumnar thin films deposited by the magnetron sputtering technique at oblique geometries and at relatively low temperatures has been analyzed for materials as different as Au, Pt, Ti, Cr, TiO2, Al, HfN, Mo, V, WO3 and W. Despite similar deposition conditions, two characteristic nanostructures have been identified depending on the material: a first one defined by highly tilted and symmetric nanocolumnar structures with a relatively high film density, and a second one characterized by rather vertical and asymmetric nanocolumns, with a much lower film density. With the help of a model, the two characteristic nanostructures have been linked to different growth dynamics and, specifically, to different surface relaxation mechanisms upon the incorporation of gaseous species with kinetic energies above the surface binding energy . Moreover, in the case of Ti, a smooth structural transition between the two types of growths has been found when varying the value of the power used to maintain the plasma discharge. Based on these results, the existence of different surface relaxation mechanisms is proposed, which quantitatively explains numerous experimental results presented in this work, as well as others taken from the literature, under the same conceptual framework.
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19

Sutter, E., P. Sutter, and J. J. Moore. "Microstructure of Sputter Deposited TiO2/SiO2 Multilayer Optical Coatings." MRS Proceedings 654 (2000). http://dx.doi.org/10.1557/proc-654-aa3.38.1.

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AbstractThe microstructure of TiO2/SiO2 multilayer optical filters has been investigated in detail by cross-sectional transmission electron microscopy and related to their optical properties and stability. The amorphous TiO2 layers in the as-deposited multilayers are found to consist of nanocolumns and intercolumnar regions with non-stoichiometric or lower density material. In humid ambients this microstructure absorbs moisture which causes a shift in the absorption edge of the filters. Upon annealing the TiO2layers are found to recrystallize into the low-temperature anatase modification which leads to significantly improved stability of the optical properties of the filters.
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20

Wu, Yunjian, Shiyi Tang, Ruohan Li, Yong Wang, and Changyu Wu. "From “Tanghulu” to “Sausage”: gold nanosheets-decorated TiO2 nanocolumns/carbon fiber as SERS substrate." Journal of Materials Science, August 8, 2023. http://dx.doi.org/10.1007/s10853-023-08816-6.

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21

Azpiroz, Ramón, Enrique Carretero, Ana Cueva, Aida González, Manuel Iglesias, and Jesús J. Pérez-Torrente. "In-flow photocatalytic oxidation of NO on glasses coated with nanocolumnar porous TiO2 thin films prepared by reactive sputtering." Applied Surface Science, September 2022, 154968. http://dx.doi.org/10.1016/j.apsusc.2022.154968.

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