Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 20, Pages 8799-8809Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c02286
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Funding
- Japan Society for the Promotion of Science (JSPS) [GR073]
- JSPS [15H02001, 19H02556]
- PRESTO Structure Control and Function program of the Japan Science and Technology Agency (JST)
- JKA through AUTORACE [2019-M188]
- Grants-in-Aid for Scientific Research [19H02556] Funding Source: KAKEN
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Titanium dioxide (TiO2) is a crucial semiconductor for photocatalysts, solar cells, hydrogen evolution reactions, and antivirus agents. The properties and performances of these applications can improve significantly if the integrated TiO2 acts as a light harvester through a large field enhancement. This study investigates the electromagnetic field enhancement of a nanogap-rich TiO2 film with a large area, prepared by a facile dry process at room temperature. Herein, the loading pressure is applied to the TiO2 particles for closely packing them in the film. The field enhancement, as a function of the loading pressure, is explored from the fluorescence intensity enhancement of a dye molecule. An average enhancement factor >2000 is achieved, which is a remarkable record for semiconductors. Furthermore, the reproducibility is significant; the relative standard deviation value is small (similar to 4%). Calculations were performed using the finite-difference-time-domain method. A nanogap of 5 nm yields the highest EF for triangular-prism TiO2 particles.
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