High surface area Cu2ZnSnS4 nanosheets synthesized by microwave irradiation method: A material for detecting ammonia-ammonium ions in wastewater. (December 2021)

• Record Type: Journal Article
• Authors: Huo, Xiaomin; Shen, Honglie; Song, Wei; Sun, Luanhong; Saddique, Jaffer; Yang, Jiale
• Is Part Of: Materials science in semiconductor processing. Volume 136(2021)
• Publication Date: 2021-12
• Subjects: Sensor -- Cu2ZnSnS4 (CZTS) -- Nanosheet -- Ammonia -- Ammonium ions; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2021.106159
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: A highly sensitive and selective electrochemical sensor based on porous Cu2 ZnSnS4 (CZTS) nanosheets is required for detecting ammonia-ammonium ions (NH3 –NH4 + ). Porous CZTS nanosheets synthesized by microwave irradiation method were characterized by Raman, XRD, SEM, TEM, BET, DLS and NH3 -TPD. The porous nanosheets of CZTS-30 irradiated for 30 min with a surface area of 51.3 m 2 g −1 are significant material and possess many important active sites for NH3 –NH4 + oxidation. The electrode was made of a glassy carbon electrode (GCE) modified by CZTS-30. It was revealed by electrochemical measurements that there were two linear ranges for NH3 –NH4 + . One was the high concentration ranging from 1.0 mM to 600.0 mM ( R 2 = 0.9989) with a sensitivity of 8.29 μA mM −1 cm −2, and the other was the low concentration between 0.1 mM and 1.0 mM ( R 2 = 0.9990) with a high sensitivity of 96.14 μA mM −1 cm −2 . It showed a detection limit of 30 μM (S/N = 10) for the sensor in NH3 –NH4 + solution mixed with 0.5 mM H2 SO4 at a fixed scan rate of 20 mV s −1 . This sensor also demonstrated desirable stability, reversibility and selectivity to NH3 –NH4 + . The CZTS/GCE is believed to become a new candidate structure for the electrochemical detection of NH3 –NH4 + .