Coarsened TiO2 nanoparticles generated from basic titanate precursors

Jeffrey Brownson, Eva Tsang, Marc A. Anderson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

TiO2 is a favored electron acceptor for composite photovoltaic solar cells. The n-type semiconductor has a wide band gap and favorable alignment of the conduction band relative to the excited states of interfacial visible light "sensitizers". Mesoporous anatase yields architectures that greatly enhance interfacial areas between the oxide and sensitizers (dyes, inorganic semiconductors, or polymers). However, a compromise must be established between increased surface area for very small nanoparticles and reduced interfacial charge carrier recombination for larger nanoparticles. A low-temperature route for nanoparticulate alkylammonium titanate suspensions has been developed for the precursor materials. These precursors were then subjected to hydrothermal coarsening, converting the titanates to anatase (TiO2) with larger dipyramidal nanoparticle morphologies. The materials were compared with sol-gel derived anatase nanoparticles. Powders of the materials were characterized by XRD, FTIR, SEM, and nitrogen absorption. Porous films were deposited on transparent conductive oxides to determine photocurrent onset potentials relative to SCE.

Original languageEnglish (US)
Title of host publication233rd ACS National Meeting, Abstracts of Scientific Papers
StatePublished - Dec 28 2007
Event233rd ACS National Meeting - Chicago, IL, United States
Duration: Mar 25 2007Mar 29 2007

Other

Other233rd ACS National Meeting
CountryUnited States
CityChicago, IL
Period3/25/073/29/07

Fingerprint

Titanium dioxide
Nanoparticles
Oxides
Semiconductor materials
Coarsening
Conduction bands
Charge carriers
Photocurrents
Excited states
Powders
Sol-gels
Suspensions
Solar cells
Polymers
Energy gap
Coloring Agents
Nitrogen
Dyes
Scanning electron microscopy
Electrons

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Brownson, J., Tsang, E., & Anderson, M. A. (2007). Coarsened TiO2 nanoparticles generated from basic titanate precursors. In 233rd ACS National Meeting, Abstracts of Scientific Papers
Brownson, Jeffrey ; Tsang, Eva ; Anderson, Marc A. / Coarsened TiO2 nanoparticles generated from basic titanate precursors. 233rd ACS National Meeting, Abstracts of Scientific Papers. 2007.
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Brownson, J, Tsang, E & Anderson, MA 2007, Coarsened TiO2 nanoparticles generated from basic titanate precursors. in 233rd ACS National Meeting, Abstracts of Scientific Papers. 233rd ACS National Meeting, Chicago, IL, United States, 3/25/07.

Coarsened TiO2 nanoparticles generated from basic titanate precursors. / Brownson, Jeffrey; Tsang, Eva; Anderson, Marc A.

233rd ACS National Meeting, Abstracts of Scientific Papers. 2007.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Tsang, Eva

AU - Anderson, Marc A.

PY - 2007/12/28

Y1 - 2007/12/28

N2 - TiO2 is a favored electron acceptor for composite photovoltaic solar cells. The n-type semiconductor has a wide band gap and favorable alignment of the conduction band relative to the excited states of interfacial visible light "sensitizers". Mesoporous anatase yields architectures that greatly enhance interfacial areas between the oxide and sensitizers (dyes, inorganic semiconductors, or polymers). However, a compromise must be established between increased surface area for very small nanoparticles and reduced interfacial charge carrier recombination for larger nanoparticles. A low-temperature route for nanoparticulate alkylammonium titanate suspensions has been developed for the precursor materials. These precursors were then subjected to hydrothermal coarsening, converting the titanates to anatase (TiO2) with larger dipyramidal nanoparticle morphologies. The materials were compared with sol-gel derived anatase nanoparticles. Powders of the materials were characterized by XRD, FTIR, SEM, and nitrogen absorption. Porous films were deposited on transparent conductive oxides to determine photocurrent onset potentials relative to SCE.

AB - TiO2 is a favored electron acceptor for composite photovoltaic solar cells. The n-type semiconductor has a wide band gap and favorable alignment of the conduction band relative to the excited states of interfacial visible light "sensitizers". Mesoporous anatase yields architectures that greatly enhance interfacial areas between the oxide and sensitizers (dyes, inorganic semiconductors, or polymers). However, a compromise must be established between increased surface area for very small nanoparticles and reduced interfacial charge carrier recombination for larger nanoparticles. A low-temperature route for nanoparticulate alkylammonium titanate suspensions has been developed for the precursor materials. These precursors were then subjected to hydrothermal coarsening, converting the titanates to anatase (TiO2) with larger dipyramidal nanoparticle morphologies. The materials were compared with sol-gel derived anatase nanoparticles. Powders of the materials were characterized by XRD, FTIR, SEM, and nitrogen absorption. Porous films were deposited on transparent conductive oxides to determine photocurrent onset potentials relative to SCE.

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M3 - Conference contribution

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BT - 233rd ACS National Meeting, Abstracts of Scientific Papers

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Brownson J, Tsang E, Anderson MA. Coarsened TiO2 nanoparticles generated from basic titanate precursors. In 233rd ACS National Meeting, Abstracts of Scientific Papers. 2007