Subsequent monitoring of ferric ion and ascorbic acid using graphdiyne quantum dots-based optical sensors
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ORIGINAL PAPER
Subsequent monitoring of ferric ion and ascorbic acid using graphdiyne quantum dots-based optical sensors Qiang Bai 1,2 & Chaoyang Zhang 3 & Long Li 3 & Zhiling Zhu 1 & Lina Wang 3 & Fuyi Jiang 2 & Manhong Liu 1 & Zhaobo Wang 1 & William W. Yu 1,4 & Fanglin Du 1 & Zhugen Yang 5 & Ning Sui 1 Received: 3 September 2020 / Accepted: 28 October 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Graphdiyne (GDY) as an emerging carbon nanomaterial has attracted increasing attention because of its uniformly distributed pores, highly π-conjugated, and tunable electronic properties. These excellent characteristics have been widely explored in the fields of energy storage and catalysts, yet there is no report on the development of sensors based on the outstanding optical property of GDY. In this paper, a new sensing mechanism is reported built upon the synergistic effect between inner filter effect and photoinduced electron transfer. We constructed a novel nanosensor based upon the newly-synthesized nanomaterial and demonstrated a sensitive and selective detection for both Fe3+ ion and ascorbic acid, enabling the measurements in real clinical samples. For the first time fluorescent graphdiyne oxide quantum dots (GDYO-QDs) were prepared using a facile ultrasonic protocol and they were characterized with a range of techniques, showing a strong blue-green emission with 14.6% quantum yield. The emission is quenched efficiently by Fe3+ and recovered by ascorbic acid (AA). We have fabricated an off/on fluorescent nanosensors based on this unique property. The nanosensors are able to detect Fe3+ as low as 95 nmol L−1 with a promising dynamic range from 0.25 to 200 μmol L−1. The LOD of AA was 2.5 μmol L−1, with range of 10–500 μmol L−1. It showed a promising capability to detect Fe3+ and AA in serum samples. Keywords Fluorescence . Quenching effect . Graphdiyne . Quantum dots . Fe3+ . Ascorbic acid
Introduction As one of the most trace metal elements in human bodies, iron (Fe) is the core part of hemoglobin and plays an important role in transporting oxygen and participating in human metabolism [1–5]. However, abnormal Fe3+ fluctuation is hazardous to
* Lina Wang [email protected] * Fanglin Du [email protected]
human bodies, which can cause diseases, such as anemia, hepatitis, intelligence decline, agitans paralysis, and cancer [6–8]. Therefore, the monitoring of Fe3+ content is always an active issue in biosensing. Plenty of methods can be used to detect the above substances, such as mass spectroscopy [9], electrochemistry [10], colorimetric analysis [11, 12],
2
School of Environment and Material Engineering, Yantai University, Yantai, Shandong 264005, China
3
College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
4
Department of Chemistry and Physics, Louisiana State University Shreveport, Shreveport, LA 71115, USA
5
Cranfield Water Science Institute, Cranfield University, Milton Keynes MK43 0AL, UK
* Zhugen Yang zh
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