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UV Radiation Cumulative Recording Based on Amorphous TiO2 Nanotubes
Xiaohui Wang1,2, Xue Chen1,2, Dainan Zhang1
1Center for Applied Chemistry , University of Electronic Science and Technology of China , Chengdu 611731 , China.
ACS Sensors
|August 13, 2019
Summary
Titanium dioxide nanotube arrays exhibit UV photochromism, changing color with light exposure. This discovery enables a new dosimeter for tracking cumulative UV radiation for health and safety.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Titanium dioxide (TiO2) is a versatile semiconductor material.
- Photochromism involves reversible color change upon light exposure.
- UV radiation poses risks to skin and public health.
Purpose of the Study:
- To investigate UV photochromism in amorphous TiO2 nanotube arrays (NTAs).
- To develop a novel UV radiation cumulative dosimeter based on this photochromic effect.
Main Methods:
- Fabrication of amorphous TiO2 NTAs.
- Irradiation of TiO2 NTAs with UV light (bulb and natural sunlight).
- Characterization of color changes and underlying mechanisms (Ti3+ ion formation).
- Design and assembly of a photochromic film and colorimetric card dosimeter.
Main Results:
- Amorphous TiO2 NTAs demonstrated reversible color change from light yellow to dark brown under UV exposure.
- The photochromism is attributed to the generation of Ti3+ ions in the TiO2 lattice.
- A functional UV radiation cumulative dosimeter was successfully fabricated.
Conclusions:
- Amorphous TiO2 NTAs exhibit novel UV-induced photochromism.
- This photochromic effect can be harnessed to create effective UV radiation dosimeters.
- The developed dosimeter offers an intuitive tool for monitoring UV exposure, crucial for public health and skin safety.
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