Relevant bibliographies by topics / TiO2 nanocolumns

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  2. Dissertations / Theses

Academic literature on the topic 'TiO2 nanocolumns'

Author: Grafiati
Published: 25 May 2024

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Journal articles on the topic "TiO2 nanocolumns"

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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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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "TiO2 nanocolumns"

1

Jankulovska, Milena. "Study of the electrochemical properties of nanostructured TiO2 electrodes." Doctoral thesis, Universidad de Alicante, 2015. http://hdl.handle.net/10045/50211.

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El presente trabajo de Tesis Doctoral se centró en la preparación y en el estudio de las propiedades fotoelectroquímicas de electrodos nanoestructurados de dióxido de titanio compuestos por partículas de diferente morfología: nanopartículas, nanohilos, nanotubos, nanocolumnas y nanofibras. Por un lado se estudió la influencia de la fase cristalina (anatasa y rutilo) y por otro, la influencia del tamaño de las partículas y su morfología sobre las propiedades fotoelectroquímicas de electrodos nanoestructurados de dióxido de titanio. Para estudiar la influencia de la fase cristalina se prepararon electrodos de anatasa y rutilo con la misma morfología (nanohilos) y tamaño de partícula (~ 2nm). Estos electrodos se emplearon para estudiar la estructura electrónica de ambas fases cristalinas. También se realizó un estudio de la distribución de los estados electrónicos empleando electrodos con diferente morfología de nanopartículas (nanotubos, nanocolumnas, nanopartículas). Los estudios se llevaron a cabo empleando voltametría cíclica, cronoamperometría, cronopotenciometría y métodos espectroscópicos (espectroscopía ultravioleta-visible, espectroscopía de voltaje superficial y espectroscopía de resonancia paramagnética electrónica). Las propiedades fotoelectroquímicas para las diferentes nanoestructuras se estudiaron tanto en medio ácido como en medio alcalino empleando diferentes compuestos orgánicos modelo (ácido fórmico, metanol e hidracina). Se estudió la influencia del tratamiento térmico de los nanohilos sobre su cristalinidad y sus propiedades fotoelectoquímicas. También se prepararon estructuras organizadas jerárquicamente basadas en nanotubos de anatasa decorados con nanohilos tanto de anatasa como de rutilo. El efecto del sustrato se estudió comparando electrodos de nanotubos de dióxido de titanio preparados sobre titanio y sobre vidrio conductor. En el presente trabajo también se estudió la actividad de dióxido de titanio modificado con nanopartículas de oro en el rango visible del espectro empleando métodos espectroscópicos.
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