Realization of selective CO detection by Ni-incorporated metal-organic frameworks
- Authors
- Duy-Khoi Nguyen; Lee, Jae-Hyoung; Thanh-Binh Nguyen; Tan Le Hoang Doan; Bach Thang Phan; Mirzaei, Ali; Kim, Hyoun Woo; Kim, Sang Sub
- Issue Date
- Jul-2020
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Metal organic framework; CO gas sensor; Selectivity; Sensitivity; Sensing mechanism
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.315, pp.1 - 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 315
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1855
- DOI
- 10.1016/j.snb.2020.128110
- Abstract
- In this study, two different kinds of MOFs such as Ni-VNU-74-I and -II were examined for CO gas sensing. The Ni-VNU-74-I and -II showed different pore sizes and surface areas. The as-synthesized iso-reticular type Ni-VNU-74-I and -II sensors showed well crystallin chrysanthemums like morphology with great thermal stability, and surface areas (up to 2350 m(2)/g). Gas-sensing studies were performed systematically at different temperatures and towards different gases. The Ni-VNU-74-II gas sensor showed a stronger gas response (R-a/R-g = 1.7) to 50 ppm CO gas than to other gases at 200 degrees C because of the higher quadrupole moment of the CO gas molecules, leading to a strong interaction with a partial charge in the open metal Ni sites. In addition, the better performance of the Ni-VNU-74-II gas sensor compared to the Ni-VNU-74-I gas sensor (Ra/Rg for 50 ppm CO gas = 1.2) was related to the better interaction between the open metal sites (Ni) and CO molecules through a special structure of the Ni-VNU-74-II gas sensor with smaller pore sizes, higher surface area, and higher concentration of open metal Ni2+ sites. The sensing performance in this work indicates Ni-MOFs as the potential gas sensors for the detection of harmful gases in practical applications.
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