An aqueous solution of fluorescent MoS2 quantum dots toward a sensitive and selective probe for Fe3+: A tri-mode spectroscopic sensing technique

被引:14
作者
Ali, Mir Sahanur [1 ,2 ]
Ali, Mir Sahidul [1 ]
Bhunia, Nayan [2 ]
Mallik, Amit [3 ]
Dutta, Koushik [1 ]
Karmakar, Srikanta [1 ]
Mukherjee, Prasun [2 ]
Chattopadhyay, Dipankar [1 ,2 ]
机构
[1] Univ Calcutta, Dept Polymer Sci & Technol, Kolkata 700009, West Bengal, India
[2] Univ Calcutta, Ctr Res Nanosci & Nanotechnol, Kolkata 700106, West Bengal, India
[3] Acharya Jagadish Chandra Bose Coll, Dept Chem, 1 1B Acharya Jagadish Chandra Bose Rd, Kolkata 700020, West Bengal, India
关键词
MoS2 quantum dots; Tri-mode sensing technique; Photoluminescence quenching; Metal ion sensing; PHOTOLUMINESCENCE; ION; NANOPARTICLES; PLATFORM; SENSOR; CONVERSION; CHARGE; GQDS;
D O I
10.1016/j.jpcs.2023.111261
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this work, MoS2 quantum dots (MSQDs) of average size-3.0 +/- 1.2 nm in aqueous medium were synthesized by simple technique. Three different emissive sites of MSQDs were observed from the time-resolved photo-luminescence decay curves with an average lifetime of 3.75 +/- 0.40 ns. The high fluorescence quenching ability toward heavy metal ions of synthesized MSQDs was used for Fe3+ ion sensing, and sensitivity was 7.9 x 10-4 mu M-1. The limits of detection and quantification were-0.24 and-0.71 mu M, respectively. The zeta potential (zeta) of bare MSQD was-28.0 mV and was more positive in the presence of Fe3+ compared to other metal ions. It is observed that the value of zeta became more positive with increasing Fe3+ ion concentrations. Hence, tri-mode sensing techniques were used for sensing different metal ions and showed excellent selectivity toward Fe3+ ions.
引用
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页数:9
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