Sulfur quantum dot as a fluorescent nanoprobe for Fe3+ ions: Uncovering of detection mechanism, high sensitivity, and large detection range

Liu, Yong-fengUmeå universitet,Institutionen för fysik,College of Physical Science and Technology, Yangzhou University, Yangzhou, China; Microelectronics Industry Research Institute, Yangzhou University, Jiangsu, Yangzhou, China (författare)

Sulfur quantum dot as a fluorescent nanoprobe for Fe3+ ions : Uncovering of detection mechanism, high sensitivity, and large detection range

Sulfur quantum dots (SQDs), as a novel metal-free fluorescent material, are getting increasingly tremendous attention in metal ion detection, especially for Fe3+, due to the merits of antimicrobial potential, low toxicity, and exciting optoelectronic properties. However, sensing mechanism of SQD based fluorescent probe for Fe3+ is not clear yet, and high sensitivity and large detection range remain a challenge. Here, we report the synthesis of hydrophilic SQDs as a fluorescent nanoprobe for Fe3+ via a fluorescent turn-off mode. We systematically studied the quenching mechanism by ultraviolet–visible absorption spectra, steady-state and time-resolved photoluminescent spectra, and temperature-dependent quenching constants. Results unclearly evidenced the quenching behavior to both inner filter effect and static quenching. Furthermore, the nanoprobe presents a large detection range from 2.5 to 700 μM and a limit of detection low to 53.6 nM, both of which are the record performance to our knowledge. At last, it shows high selectivity toward Fe3+ and presents no ionic strength effect in the range of investigation, which enables surprising results for Fe3+ detection in deionized water with interference ion and real water samples.

NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
Detection mechanism
Fe3+ detection
Fluorescent quenching
Inner filter effect
Static quenching
Sulfur quantum dots

Shao, XiuwenCollege of Physical Science and Technology, Yangzhou University, Yangzhou, China (författare)
Gao, ZhaojuCollege of Physical Science and Technology, Yangzhou University, Yangzhou, China (författare)
Zhu, XiaolinCollege of Physical Science and Technology, Yangzhou University, Yangzhou, China (författare)
Pan, ZhangchengCollege of Physical Science and Technology, Yangzhou University, Yangzhou, China (författare)
Ying, YupengCollege of Physical Science and Technology, Yangzhou University, Yangzhou, China (författare)
Yang, JinpengCollege of Physical Science and Technology, Yangzhou University, Yangzhou, China (författare)
Pei, WeiCollege of Physical Science and Technology, Yangzhou University, Yangzhou, China (författare)
Wang, JiaUmeå universitet,Institutionen för fysik(Swepub:umu)jiwa0007 (författare)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

Av författaren/redakt...: Liu, Yong-feng; Shao, Xiuwen; Gao, Zhaoju; Zhu, Xiaolin; Pan, Zhangcheng; Ying, Yupeng; visa fler...; Yang, Jinpeng; Pei, Wei; Wang, Jia; visa färre...

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