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- Title
Identification of Cadmium Compounds in a Solution Using Graphene-Based Sensor Array.
- Authors
Yoshii, Tomoya; Nishitsugu, Fuka; Kikawada, Kazuki; Maehashi, Kenzo; Ikuta, Takashi
- Abstract
Rapid detection of heavy metals in solution is necessary to ensure human health and environmental protection. Some heavy-metal compounds are present in solution as compounds instead of as ions owing to their low ionization. Therefore, the development of sensor devices for the detection of heavy-metal compounds is important. In this study, as a proof of concept, we propose a sensor device using graphene and a chelating agent, which were used to develop an identification technique for three types of cadmium compounds. Pristine-graphene and two types of chelator-modified graphene-based sensors were successfully used to detect cadmium compounds at concentrations ranging from 50 to 1000 μM. The detection time was less than 5 min. The three type of graphene-based sensors responded differently to each cadmium compound, which indicates that they detected cadmium as a cadmium compound instead of as cadmium ions. Furthermore, we successfully identified cadmium compounds by operating these three types of sensors as a sensor array on the same substrate. The results indicate that sensors that focus on heavy-metal compounds instead of heavy-metal ions can be used for the detection of heavy metals in solution.
- Subjects
CADMIUM compounds; SENSOR arrays; METAL detectors; HEAVY metals; ENVIRONMENTAL protection; CHELATING agents
- Publication
Sensors (14248220), 2023, Vol 23, Issue 3, p1519
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s23031519