Bidirectional PET in selective detection of Nb(V) by synergistic modification of carboxyl groups and carbon vacancies in N-CQDs.
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| Title: | Bidirectional PET in selective detection of Nb(V) by synergistic modification of carboxyl groups and carbon vacancies in N-CQDs. |
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| Authors: | Fu, Ce1 (AUTHOR), Kong, Lingxin1 (AUTHOR), Shan, Ao1 (AUTHOR), Zhang, Yanan1 (AUTHOR), Zhai, Zhaoxia1 (AUTHOR), Qiu, Peilun1 (AUTHOR), Hu, Chuqiao1 (AUTHOR), Liu, Jianqiao1 (AUTHOR) jqliu@dlmu.edu.cn, Wang, Junsheng1 (AUTHOR) wangjsh@dlmu.edu.cn |
| Source: | Applied Surface Science. Aug2026, Vol. 737, pN.PAG-N.PAG. 1p. |
| Subjects: | Photoinduced electron transfer, Carboxyl group, Pollutants, Fluorescence, Carbon nanodots, Fluorescence quenching |
| Abstract: | [Display omitted] • N-CQDs are synergistically modified by carboxyl groups and carbon vacancies. • The selected Nb(V) is a type of multi-morphological pollutant. • Excellent performance with R2 = 0.99444 and LOD = 5 nM. • N-CQDs exhibit superior selectivity for Nb(V) compared to over 20 common ions. • Fluorescence quenching mechanism is bidirectional photoinduced electron transfer. Electron transfer plays a critical role in various analytical techniques, particularly in fluorescence-based sensing, where it governs the fluorescence quenching mechanisms that enable selective detection of target analytes. However, unidirectional electron transfer fails to capture the complex mechanisms involved in the detection of multi-morphological pollutants. Herein, we demonstrate a bidirectional photoinduced electron transfer (PET) mechanism in N-doped carbon quantum dots (N-CQDs), where both donor-excited PET and acceptor-excited PET are synergistically utilized for the selective detection of Nb(V). This bidirectional PET mechanism elucidates the fluorescence quenching phenomenon of N-CQDs which is caused by different forms of Nb(V). N-CQDs with COOH and carbon vacancies are employed to detect Nb(V), and the performance is compared against more than 20 common ions, ensuring the stability and adaptability of the fluorescence sensing. It is evident that N-CQDs exhibit a remarkable selectivity for Nb(V) over other ions, highlighting their potential as a highly specific fluorescence sensor for this particular pollutant. The structural features of N-CQDs confirm that N-CQDs possess COOH and carbon vacancies, which play a key role in enhancing the interaction with Nb(V) and enabling efficient detection. This work not only contributes to the advancement of fluorescence sensing by demonstrating a novel bidirectional PET mechanism for multi-morphological pollutants detection, but also addresses the challenge of selective detection of complex pollutants, offering a new approach for the rapid and accurate monitoring of Nb(V). [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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