High-performance chlorobenzene sensor of bimetallic ZIF-8(Zn@Co) based one-dimensional photonic crystals

• Published in: Physics letters. A 2021-06, Vol.400, p.127301, Article 127301
• Main Authors: Xing, Yizhou, Wang, Zhaolong, Zhu, Yabin, Yan, Jun, Chen, Yunlin
• Format: Article
• Language: English
• Subjects: Bimetallic ZIF-8(Zn@Co); Chlorobenzene; Optical sensor; Photonic crystals
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2021.127301

•We proposed the first bimetallic ZIF-8(Zn@Co) 1DPC gas sensor for chlorobenzene vapor detection.•The bimetallic 1DPC sensors showed better optical sensing property comparing to the normal ZIF-8 based 1DPCs.•The sensor's optical response time is about 600 ms.•The bimetallic sensor exhibits exceptional reversibility and stability. The bimetallic mental-organic framework (MOF) based one-dimensional photonic crystals (1DPCs) (ZIF-8(Zn@Co)/TiO2)n chlorobenzene sensors were proposed and investigated for the first time. The optimized structure of the bimetallic MOF-based 1DPCs was theoretically simulated to be 4-periods using the transfer matrix method (TMM). The fabricated bimetallic 1DPCs sensors showed better optical sensing property of vapors comparing to the normal ZIF-8 based 1DPCs. Besides, the bimetallic sensors demonstrated reliable optical distinction between chlorobenzene (MCB) and other tested vapors. The relationship between the wavelength and the MCB concentration in the low concentration was demonstrated to be linear and the sensitivity of the bimetallic sensors was 0.05 nm/ppm toward MCB. The results showed that the response time and recovery time at 600 ppm were 600 ms and 9.5 s, respectively. Moreover, the fabricated bimetallic ZIF-8(Zn@Co) based 1DPCs sensors performed repeatability, reliability and exceptional thermal, mechanical and long-time storage stability, demonstrating great potential and competitiveness towards MCB sensing.