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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.
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]
Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 193246597
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  Label: Title
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  Data: Bidirectional PET in selective detection of Nb(V) by synergistic modification of carboxyl groups and carbon vacancies in N-CQDs.
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  Data: <searchLink fieldCode="AR" term="%22Fu%2C+Ce%22">Fu, Ce</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kong%2C+Lingxin%22">Kong, Lingxin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shan%2C+Ao%22">Shan, Ao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yanan%22">Zhang, Yanan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhai%2C+Zhaoxia%22">Zhai, Zhaoxia</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qiu%2C+Peilun%22">Qiu, Peilun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hu%2C+Chuqiao%22">Hu, Chuqiao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Jianqiao%22">Liu, Jianqiao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jqliu@dlmu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Junsheng%22">Wang, Junsheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wangjsh@dlmu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Surface+Science%22">Applied Surface Science</searchLink>. Aug2026, Vol. 737, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Photoinduced+electron+transfer%22">Photoinduced electron transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Carboxyl+group%22">Carboxyl group</searchLink><br /><searchLink fieldCode="DE" term="%22Pollutants%22">Pollutants</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence%22">Fluorescence</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+nanodots%22">Carbon nanodots</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence+quenching%22">Fluorescence quenching</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: [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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.apsusc.2026.166896
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Photoinduced electron transfer
        Type: general
      – SubjectFull: Carboxyl group
        Type: general
      – SubjectFull: Pollutants
        Type: general
      – SubjectFull: Fluorescence
        Type: general
      – SubjectFull: Carbon nanodots
        Type: general
      – SubjectFull: Fluorescence quenching
        Type: general
    Titles:
      – TitleFull: Bidirectional PET in selective detection of Nb(V) by synergistic modification of carboxyl groups and carbon vacancies in N-CQDs.
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            NameFull: Fu, Ce
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            NameFull: Kong, Lingxin
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            NameFull: Shan, Ao
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            NameFull: Zhang, Yanan
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            NameFull: Zhai, Zhaoxia
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            NameFull: Hu, Chuqiao
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            NameFull: Wang, Junsheng
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            – D: 15
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
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            – TitleFull: Applied Surface Science
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