Journal article
Electronic Structure of 1D Lepidocrocite TiO 2 as Revealed by Optical Absorption and Photoelectron Spectroscopy
Journal of physical chemistry. C, v 127(15), pp 7275-7283
20 Apr 2023
Abstract
We recently demonstrated scalable, one-pot syntheses of one-dimensional, titania lepidocrocite microfilaments by reacting Ti-containing water-insoluble, earth-abundant compounds such as TiC, TiB2, TiN, etc., with tetraalkylammonium hydroxide, TMAOH, for a few days at 85 °C under ambient pressure. The resulting one-dimensional lepidocrocite (1DL) titania-based nanofilaments, NFs, tend to self-align along the [100] growth direction to form microfilaments that sometimes self-align into pseudo-two-dimensional (2D) sheets. With sub-square-nanometer cross sections, the resulting band gap energy, Eg, at 4.0 eV is one of the highest ever reported for a titania material. Despite a large band gap, the nanofilaments exhibit significant absorbance throughout the visible spectrum ascribable to intra-gap defect states based on UV–Vis absorbance data and ultraviolet photoelectron spectroscopy (UPS). UP spectra demonstrate work functions of 4.0 ± 0.3 eV vs vacuum and Fermi energies of 3.8 ± 0.1 eV with respect to the valence band edge. Transient absorption (TA) spectroscopy of the 1DL nanofilament thin films with sub-band-gap, visible-light illumination reveals photoexcitations with lifetimes in excess of nanoseconds. In combination with the established oxidative stability, long-lived visible photoexcitations bring forward possible applications of 1DL nanofilaments in photocatalysis and optoelectronics.
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Details
- Title
- Electronic Structure of 1D Lepidocrocite TiO 2 as Revealed by Optical Absorption and Photoelectron Spectroscopy
- Creators
- Erika Colin-Ulloa - Worcester Polytechnic InstituteJulia L. Martin - Worcester Polytechnic InstituteRyan J. Hanna - Worcester Polytechnic InstituteMichelle H. Frasch - Worcester Polytechnic InstituteRebecca R. Ramthun - Worcester Polytechnic InstituteHussein O. Badr - Drexel UniversityJoshua R. Uzarski - Combat Capabilities Development Command Soldier CenterMichel W. Barsoum - Drexel UniversityRonald L. Grimm - Worcester Polytechnic InstituteLyubov V. Titova - Worcester Polytechnic Institute
- Publication Details
- Journal of physical chemistry. C, v 127(15), pp 7275-7283
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 9
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000970195000001
- Scopus ID
- 2-s2.0-85152205458
- Other Identifier
- 991020516946304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology