Visual management of medical things with an advanced color-change RFID tag

Ran Sun; Budi Rahmadya; Fangyuan Kong; Shigeki Takeda

doi:10.1038/s41598-021-02501-x

Visual management of medical things with an advanced color-change RFID tag

Sci Rep. 2021 Nov 26;11(1):22990. doi: 10.1038/s41598-021-02501-x.

Authors

Ran Sun¹, Budi Rahmadya², Fangyuan Kong³, Shigeki Takeda³

Affiliations

¹ College of Engineering, Ibaraki University, Ibaraki, 316-8511, Japan. ran.sun.es@vc.ibaraki.ac.jp.
² Department of Computer Engineering, Faculty of Information and Technology, Andalas University, Limau Manis, Padang, Sumatera Barat, 25175, Indonesia.
³ College of Engineering, Ibaraki University, Ibaraki, 316-8511, Japan.

Abstract

This paper proposes a visual management scheme of medical things with a color-change radio frequency identification (RFID) tag. The color-change RFID tag employs a specific RFID tag integrated circuit (IC) and a laminated pH-indicating paper. The IC has energy harvesting and switched ground functions, which enable it to generate electricity to the laminated pH-indicating paper. This phenomenon causes electrolysis of NaCl solution absorbed in the laminated pH-indicating paper. Electrolysis generates alkaline matter to change the color of the pH-indicating paper. This paper gives a new and sensitive structure of the laminated pH-indicating paper. The proposed advanced color-change RFID tag with new laminated pH-indicating paper succeeds in changing its color noticeably at a 1 m distance using an RFID reader radiating 1 W radio waves. The color change was observed 3-5 s after starting radio wave irradiation. The results of this experiment also confirm that the changed color can be held for over 24 h. Furthermore, two demonstrations of the visual management system of medical things (patient clothes and sanitizers) are presented.