Serendipity in solution-GQDs zeolitic imidazole frameworks nanocomposites for highly sensitive detection of sulfide ions
- Authors
- Sammi, Heena; Kukkar, Deepak; Singh, Jaskaran; Kukkar, Preeti; Kaur, Rajwinder; Kaur, Harmanpreet; Rawat, Mohit; Singh, Gurjinder; Kim, Ki-Hyun
- Issue Date
- Feb-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Fluorescence; Graphene quantum dots; Pollutant; Sensing; Sulfide; Zeolitic imidazole frameworks
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.255, pp.3047 - 3056
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 255
- Start Page
- 3047
- End Page
- 3056
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/3925
- DOI
- 10.1016/j.snb.2017.09.129
- ISSN
- 0925-4005
- Abstract
- An innovative and facile sensing approach for common inorganic anions present in aqueous media has been developed using nanocomposites of europium doped graphene quantum dots (GQDs:Eu) with zeolitic imidazole frameworks (ZIF-8). GQDs:Eu, prepared initially by solvothermal approach (at <10 nm in diameter), exhibited a strong and intense blue emission at 430 nm when dispersed in ethanol. ZIF-8 nanocubes, synthesized on a parallel basis, were in a fairly uniform size distribution (e.g., 185 nm in diameter). The formation of nanocomposites by surface adsorption (between GQDs:Eu and ZIF-8) led to significant increase in fluorescence intensity as observed through photo-luminescence spectroscopy. Their interactions with anions (e.g., in terms of variations in the fluorescence intensity) were initially checked against sulfide and other anionic species (e.g., Br-, Cl-, F-, and NO3-). Among the tested ions, GQDs:Eu-ZIF-8 were found to effectively and sensitively detect sulfide (S2-) with significantly high turn on fluorescence. The feasibility of this nanosensing system was explored further toward the detection of S2- ions. These nanocomposites were thus demonstrated to be feasible for solution-based sensing of S2- ions with high reproducibility and sensitivity at limit of detection (LOD) of 0.12 ppm.
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