Alginate capped and manganese doped ZnS quantum dots as a phosphorescent probe for time-resolved detection of copper(II)
- 283 Downloads
A method is described for the detection of Cu(II). It is based on the use of a room-temperature phosphorescent probe consisting of alginate-capped and manganese(II)-doped ZnS quantum dots. The carboxy groups at the surface of the probe strongly coordinate Cu(II) to form a complex. As a result, the 4T1-6A1 transition of the Mn(II) ions in the probe is quenched, and the long decay time (~2.1 ms in the unquenched state) is accordingly reduced. At excitation/emission wavelengths of 316/590 nm and a delay time of 0.1 ms, the probe shows a linear response in the 0.01 to 12 μM Cu(II) concentration range. The detection limit is 6.0 nM and the RSD is 3.2% (for n = 5).
KeywordsRoom-temperature phosphorescence (RTP) Alginate Stokes shift Long lifetime
This work was supported by Natural Science Foundation of China (21506002, 41673131). The authors also thanked Anhui key project of research and development plan (1704a0902006), major science and technology project of Anhui Province (17030801028) and major project of Department of Education of Anhui province (KJ2018A0513) for financial supports.
Compliance with ethical standards
The author(s) declare that they have no competing interests.
- 5.Otero-Romani J, Moreda-Pineiro A, Bermejo-Barrera A, Bermejo-Barrera P (2005) Evaluation of commercial C18 cartridges for trace elements solid phase extraction from seawater followed by inductively coupled plasma-optical emission spectrometry determination. Anal Chim Acta 536:213–218CrossRefGoogle Scholar
- 14.Gao N, Yang W, Nie H, Gong Y, Jing J, Gao L, Zhang X (2017) Turn-on theranostic fluorescent nanoprobe by electrostatic self-assembly of carbon dots with doxorubicin for targeted cancer cell imaging, in vivo hyaluronidase analysis, and targeted drug delivery. Biosens Bioelectron 96:300–307CrossRefGoogle Scholar
- 15.Hamd-Ghadareh S, Salimi A, Fathi F, Bahrami S (2017) An amplified comparative fluorescence resonance energy transfer immunosensing of CA125 tumor marker and ovarian cancer cells using green and economic carbon dots for bio-applications in labeling, imaging and sensing. Biosens Bioelectron 96:308–316CrossRefGoogle Scholar