Abstract
This study presents an introduction to a new type of ultraviolet (UV) light intensity sensor using photo-rheological (PR) fluids whose properties, such as color, can be changed by UV light. When the PR fluids were irradiated by UV light, colorimetric transitions were observed. Effectively, this means that their color changed gradually from yellow to red. The degree of the color change depended on the UV light intensity and was characterized by the hue value of the images acquired with a compact image sensor. We demonstrated that UV light-responsive capabilities can be readily imparted to PR fluids, and that the colorimetric responses to different UV light intensities can be used to measure the UV light intensities.
Highlights
These fluids have attracted increased attention since Lee et al reported that they can be synthesized in the laboratory using commercially available chemicals and ingredients, such as spiropyran, instead of using conventional ingredients, such as trans-ortho-methoxycinnamic acid, alpha-cyclodextrin, and hydroxyethyl cellulose [1,2,3,4]
PR fluids are characterized by changes in their properties such as color and viscosity when irradiated by the UV light [5]
When UV light is irradiated on a PR fluid sample, the color of the PR fluid is changed from yellow to tored
Summary
ZnO and ZnS can only detect UV wavelengths in the range of 320 nm to 400 nm because of the inherent limitations of UV-sensitive materials [8]. Nitride semiconductors, such as GaN, InN, and AlN, have been developed to detect shorter UV light wavelengths [14,15,16]. A study by Zheng et al presented a UV sensor that could detect short UV wavelengths below 200 nm using AlN micro/nanowires and compared the parameters of extensively used semiconductors in UV sensors [15].
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