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Mesoporous Solid and Yolk-Shell Titania Microspheres as Touchless Colorimetric Sensors with High Responsivity and Ultrashort Response Times
- Title
- Mesoporous Solid and Yolk-Shell Titania Microspheres as Touchless Colorimetric Sensors with High Responsivity and Ultrashort Response Times
- Authors
- Jarulertwathana, Nutpaphat; Mohd-Noor, Syazwani; Hyun, Jerome K.
- Ewha Authors
- 현가담
- SCOPUS Author ID
- 현가담
- Issue Date
- 2021
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- ISSN
- 1944-8244
1944-8252
- Citation
- ACS APPLIED MATERIALS & INTERFACES vol. 13, no. 37, pp. 44786 - 44796
- Keywords
- titania microspheres; mesoporous particles; humidity sensors; Mie scattering; touchless control; ultrashort humidity responsivity
- Publisher
- AMER CHEMICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Touchless user interfaces offer an attractive pathway toward hygienic, remote, and interactive control over devices. Exploiting the humidity generated from fingers or human speech is a viable avenue for realizing such technology. Herein, titania microspheres including solid and yolk-shell structures with varying microstructural characteristics were demonstrated as high-performance, ultrafast, and stable optical humidity sensors aimed for touchless control. When water molecules enter the microporous network of the microspheres, the effective refractive index of the microsphere increases, causing a detectable change in the light scattering behavior. The microstructural properties of the microspheres, namely, the pore characteristics, crystallinity, and particle size, were examined in relation to the humidity-sensing performance, establishing optimum structural conditions for realizing humidity-responsive wavelength shifts above 100 nm, near full-scale relative humidity (RH) responsivity, ultrashort response times below 30 ms, and prolonged lifetimes. These optimized microspheres were used to demonstrate a colorimetric touchless sensor that responds to humidity from a finger and a microcontroller-based detector that translates the moisture pattern from human speech to electrical signals in real time. These results provide practical strategies for enabling humidity-based touchless user interfaces.
- DOI
- 10.1021/acsami.1c12514
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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