Nanostructured Titanium Oxide Fabricated via Block Copolymer Template

Watanabe, Ryoko; Iyoda, Tomokazu; Ito, Kaori

doi:10.5796/electrochemistry.77.214

Cited by 6 publications

(7 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Colloidal suspensions of SnO 2 and TiO 2 are also commercially available. A thin film of nanostructured metal oxide material can then be created using a variety of techniques such as spin-coating, spray pyrolysis, − doctor blade, − electrophoretic, − and template assisted − deposition methods on top of a conducting glass substrate (referred as optically transparent electrode, OTE) or other preferred surface. The film is then annealed at 200−450 °C in air for 1−2 h. Annealing is important to reduce grain boundaries and enhance crystallinity (and thus electrical conductivity) regardless of the deposition method.…”

Section: Preparation Of Nanostructured Semiconductor Filmsmentioning

confidence: 99%

Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

et al. 2010

View full text Add to dashboard Cite

He earned his doctoral degree (1979) in Physical Chemistry from the Bombay University and carried out postdoctoral research at Boston University (1979University ( -1981 and University of Texas at Austin (1981Austin ( -1983. He joined Notre Dame in 1983 and initiated a successful research project on utilizing semiconductor nanostructures for light energy conversion. His major research interests are in three areas: (1) to understand interfacial processes and catalytic reactions at nanostructured semiconductor interface, (2) to develop semiconductor hybrid assemblies for solar cells and solar fuels, and (3) carbon nanostructure architectures for energy conversion and storage. He has authored more than 350 peer-reviewed journal papers, review articles, and book chapters with more than 20000 citations. He has also edited three books in the area of nanoscale materials.Kevin Tvrdy (far left) received his Bachelor's degree in Chemistry from the University of Nebraska in 2005, after which he worked for one year at Streck Laboratories as an R&D technician. He is currently pursuing his doctoral degree at the University of Notre Dame in the Department of Chemistry and Biochemistry under the direction of Prashant V. Kamat. His current research centers on the application of ultrafast spectroscopic measurements to better understand and improve upon electron transfer phenomena in photovoltaic devices. In his free time, Kevin enjoys spending time with his wife Jessica outdoors. David R. Baker (far right) is a Ph.D. candidate in the Department of Chemical and Biomolecular Engineering at the University of Notre Dame, and Radiation Laboratory. He earned his Bachelor's degree in Chemical Engineering at the University of Washington in 2006, where he researched interfacial water phenomena and methylotrophic bacterial populations. His current research focuses on electrode-electrolyte interactions and developing nanoarchitectures within quantum dot solar cells. He has interned with the Jet Propulsion Laboratory and the United States Department of State. Emmy J. Radich (not pictured) is a P h.D. student in the Department of Chemical and Biomolecular Engineering at the University of Notre Dame where she works under the guidance of Prashant Kamat in the Notre Dame Radiation Laboratory. Her current focus is on carbon-based nanostructured composite materials for energy applications. Emmy earned her Bachelor's and Master's degrees in Chemical Engineering from the Dave C. Swalm School of Chemical Engineering at Mississippi State University. She also spent four years working at RespirTek, Inc., a commercial bioenvironmental laboratory. Emmy's research interests are diverse, with past projects focusing on biofuels synthesis, gas hydrates, anaerobic digestion, and novel bioremediation strategies. Emmy has also worked in various government and industrial positions ranging from groundwater assessment/ remediation regulator to a refinery process engineer to laboratory director. convert light energy into electricity. 7-10 Unlike solid state photovolt...

show abstract

Section: Preparation Of Nanostructured Semiconductor Filmsmentioning

confidence: 99%

Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

et al. 2010

View full text Add to dashboard Cite

show abstract

“…[30][31][32][33][34][35][38][39][40] Moreover, the developed pattern-transfer process can be applied to various metals and metal oxides, as we have reported before.…”

Section: Direct Pattern-transfer Of Peo Cylindrical Microdomains Selfmentioning

confidence: 82%

“…Moreover, the developed pattern-transfer process can be applied to various metals and metal oxides, as we have reported before. [30][31][32][33][34][35][38][39][40]…”

Section: Direct Pattern-transfer Of Peo Cylindrical Microdomains Self...mentioning

confidence: 99%

“…The total free energy of the system is given by the following equation. [30][31][32][33][34][35][36][37][38][39][40] Herein, we applied the chemical epitaxy method with a density multiplication process to DSA of PEO-b-PMA(Az) and obtained an orientation-controlled array of the PEO cylindrical microdomains, hexagonally in lateral and perpendicularly in axial directions, with periodicity below 10 nm half pitch. The hydrophilic PEO and hydrophobic PMA(Az) segments are highly segregated, and F LC further enhance the total segregation power between the segments.…”

Section: Introductionmentioning

confidence: 99%

“…[24][25][26][27][28][29] With these characteristics, PEO-b-PMA(Az) can form perpendicularly oriented cylinders with a smaller feature size on various substrates, without applying additional ingenuities such as pre-treatment of the substrate surface, application of extra field such as an electric field, nor control of interfacial energy of the free surface. [30][31][32][33][34][35][36][37][38][39][40] Herein, we applied the chemical epitaxy method with a density multiplication process to DSA of PEO-b-PMA(Az) and obtained an orientation-controlled array of the PEO cylindrical microdomains, hexagonally in lateral and perpendicularly in axial directions, with periodicity below 10 nm half pitch. The chemical epitaxy of PEO-b-PMA(Az) was achieved by applying lithographically defined templates, whose surface was modified with a newly synthesized PMA(Az)-OH brush.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chemically directed self-assembly of perpendicularly aligned cylinders by a liquid crystalline block copolymer

et al. 2015

View full text Add to dashboard Cite

Chemical epitaxy with a density multiplication process was applied to the perpendicularly oriented hexagonal cylinder nanostructure of liquid crystalline block copolymer (PEO-b-PMA(Az)) thin film through thermally induced microphase separation by using a newly designed PMA(Az) 24 brush. The hexagonal lattice orientation with 1.9 tera-cylinders per inch 2 was laterally controlled for long-range-ordered direct self-assembly.Furthermore, the direct pattern-transfer of the assembled structure to an Au nanodot array was demonstrated by doping of HAuCl 4 selectively into the PEO cylindrical microdomains and then vacuum ultraviolet light irradiation to cause polymer etching and reduction of the Au ions. † Electronic supplementary information (ESI) available: Additional characterization of the PEO 114 -b-PMA(Az) 24 block copolymer and PMA(Az) 24 -OH, and AFM images of the PMA(Az) 24 -OH brush layer on Si wafer, and voronoi characterization. See

show abstract

Highly ordered freestanding titanium oxide nanotube arrays using Si-containing block copolymer lithography and atomic layer deposition

Bak

et al. 2013

Nanotechnology

View full text Add to dashboard Cite

Highly ordered freestanding TiO(2) nanotube arrays with atomic layer control of wall thickness were fabricated using an organic-inorganic hybrid nanoporous template and atomic layer deposition (ALD). The hybrid nanoporous template with a high-aspect-ratio cylindrical nanopore array can be readily fabricated by pattern transfer from a thin silicon-containing block copolymer film into a thick cross-linked organic polymer layer. The template exhibited excellent thermal stability and thus allowed the high-temperature ALD process to conformally deposit TiO(2) thin films on the inner surface of cylindrical nanopores. The ultrafine thickness tunability of the ALD process made it possible to develop TiO(2) nanotubes with various wall thicknesses. After the template was removed using a dry etch followed by calcination, vertically aligned and highly crystalline anatase TiO(2) nanotube arrays were produced without collapse or bundling. We also fabricated the highly uniform freestanding arrays of multi-component nanotubes composed of TiO(2)/Al(2)O(3)/TiO(2) nanolaminate and Ti-Al-O mixed-phase films with precisely controlled thickness and composition.

show abstract

Nanostructured Titanium Oxide Fabricated via Block Copolymer Template

Cited by 6 publications

References 37 publications

Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells

Chemically directed self-assembly of perpendicularly aligned cylinders by a liquid crystalline block copolymer

Highly ordered freestanding titanium oxide nanotube arrays using Si-containing block copolymer lithography and atomic layer deposition

Contact Info

Product

Resources

About