Research articles
ScienceAsia 51 (2023): 1-11 |doi:
10.2306/scienceasia1513-1874.2023.085
Absorption and emission spectral response triggered by dipicolinate in a composite structure of luminescent metal
framework and rose bengal dye
Xinhua Qina, Mimi Wangb,*, Yangyang Ouc, Fei Wangd,*
ABSTRACT: Calcium dipicolinate (CaDPA) is a biomarker for Bacillus anthracis spores. This study introduced a novel
structure designed for the optical sensing of DPA. It used a luminescent metal-organic framework (MOF) doped with
Eu ions as the supporting lattice and an organic dye derived from rose bengal as the sensing probe. The composite
structure was fully characterized, including XRD, IR, TGA, and photophysical analyses. Detailed analysis confirmed the
dual sensing capabilities of this structure, which were the colorimetric sensing reliant on absorption and ratiometric
f
luorescent sensing reliant on fluorescence. Linear sensing response was detected, with a limit of detection value of
2.2 ?M. The sensing mechanism was revealed as a combination of the emission turn-on effect of the rose bengal probe
and the emission turn-off effect of the Eu-based supporting lattice. This composite structure demonstrated superiority
over conventional MOF sensing materials due to its dual sensing abilities and potential for naked-eye detection.
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| a |
Department of Mechanical and Electrical Engineering, Lvliang Vocational and Technical College,
Lvliang 032300 China |
| b |
College of Design and Architecture, Zhejiang Wanli University, Ningbo, Zhejiang 315100 China |
| c |
Guizhou University, Guiyang, Guizhou 550025 China |
| d |
School of Material SCI. & Eng., Zhengzhou University, Zhengzhou 450001 China |
* Corresponding author, E-mail: mmwang@ahjzu.edu.cn, wryh80@126.com
Received 7 Mar 2024, Accepted 0 0000
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