Two acceptor-donor-acceptor(A-D-A)type non-fullerene acceptors(namely WH1 and WH7)containing the oxindole-based bridge are designed and synthesized for polymer solar cells(PSCs)applications.The bridge unit is introduc...Two acceptor-donor-acceptor(A-D-A)type non-fullerene acceptors(namely WH1 and WH7)containing the oxindole-based bridge are designed and synthesized for polymer solar cells(PSCs)applications.The bridge unit is introduced through a precursor(6-bromo-1-octylindoline-2,3-dione)that contains both bromine and carbonyl and provides the feasibility of the Pd-catalyzed cross-coupling reaction and the Knoevenagel condensation,respectively.This facile synthetic approach exhibits the potential to gain high performance non-fullerene acceptors through extendingπ-conjugated backbone with strong light-absorbing building blocks.The synthesis and properties of WH1 and WH7 are demonstrated with different endcap units,then PSCs are fabricated using PBDB-T:WH1 and PBDB-T:WH7 as the active layers,and attain an average power conversion efficiency(PCE)of 2.58%and 6.24%,respectively.Further device physics studies afford the deep insight of structure variation influence on the device performance.This work provides a facile non-fullerene acceptor design strategy and shows how structure variations impact the PSC performance.展开更多
A conjugated 8-hydroxyquinoline( 8-HQ)-based fluorescent chemosensor( 1) for Zinc ion( Zn^(2+)) and Cadmium ion( Cd^(2+)) was developed in aqueous solution and used for Zinc ion living cells bioimaging. The probe 1 wa...A conjugated 8-hydroxyquinoline( 8-HQ)-based fluorescent chemosensor( 1) for Zinc ion( Zn^(2+)) and Cadmium ion( Cd^(2+)) was developed in aqueous solution and used for Zinc ion living cells bioimaging. The probe 1 was weakly fluorescent,but displayed a strong fluorescence at 580 nm with a large Stokes shift of150 nm in the presence of Zn^(2+) or Cd^(2+). This probe allows the detections of Zn^(2+) in the range of 0. 8-10 μmol/L and Cd^(2+) in the range of 0. 8-8 μmol/L,with the limit of detections of 0. 2 and 0. 6μmol/L for Zn^(2+) and Cd^(2+),respectively. The present probe was successfully used for fluorescence bioimaging of Zn^(2+) or Cd^(2+) in the living cells.展开更多
Nitrogen-doped graphene quantum dots( N-GQDs)exhibiting excitation-independent green fluorescence emission( 536 nm) was facilely synthesized. The as-prepared N-GQDs showed a highly selective fluorescence quenching res...Nitrogen-doped graphene quantum dots( N-GQDs)exhibiting excitation-independent green fluorescence emission( 536 nm) was facilely synthesized. The as-prepared N-GQDs showed a highly selective fluorescence quenching response toward Hg2 + with a linear range of 0. 1-30. 0 μmol/L and detection limit of50 nmol/L. Based on the high affinity of biothiols( such as cysteine)toward Hg2 +, the quenched fluorescence of N-GQDs could be recovered upon addition of biothiols,and thereby a new fluorescence turn-on probe for cysteine detection was further developed. The linear range and detection limit for cysteine were found to be 0. 1-12. 5 μmol/L and 46 nmol/L,respectively. The present fluorescent probe worked well in a physiological pure water medium,allowing a fluorescence imaging of cysteine in living cells.展开更多
基金National Natural Science Foundation of China(No.21805032)Natural Science Foundation of Shanghai,China(No.19ZR1401400)Fundamental Research Funds for the Central Universities,China(No.20D128502).
文摘Two acceptor-donor-acceptor(A-D-A)type non-fullerene acceptors(namely WH1 and WH7)containing the oxindole-based bridge are designed and synthesized for polymer solar cells(PSCs)applications.The bridge unit is introduced through a precursor(6-bromo-1-octylindoline-2,3-dione)that contains both bromine and carbonyl and provides the feasibility of the Pd-catalyzed cross-coupling reaction and the Knoevenagel condensation,respectively.This facile synthetic approach exhibits the potential to gain high performance non-fullerene acceptors through extendingπ-conjugated backbone with strong light-absorbing building blocks.The synthesis and properties of WH1 and WH7 are demonstrated with different endcap units,then PSCs are fabricated using PBDB-T:WH1 and PBDB-T:WH7 as the active layers,and attain an average power conversion efficiency(PCE)of 2.58%and 6.24%,respectively.Further device physics studies afford the deep insight of structure variation influence on the device performance.This work provides a facile non-fullerene acceptor design strategy and shows how structure variations impact the PSC performance.
基金Shanghai Municipal Natural Science Foundation,China(No.16ZR1401700)
文摘A conjugated 8-hydroxyquinoline( 8-HQ)-based fluorescent chemosensor( 1) for Zinc ion( Zn^(2+)) and Cadmium ion( Cd^(2+)) was developed in aqueous solution and used for Zinc ion living cells bioimaging. The probe 1 was weakly fluorescent,but displayed a strong fluorescence at 580 nm with a large Stokes shift of150 nm in the presence of Zn^(2+) or Cd^(2+). This probe allows the detections of Zn^(2+) in the range of 0. 8-10 μmol/L and Cd^(2+) in the range of 0. 8-8 μmol/L,with the limit of detections of 0. 2 and 0. 6μmol/L for Zn^(2+) and Cd^(2+),respectively. The present probe was successfully used for fluorescence bioimaging of Zn^(2+) or Cd^(2+) in the living cells.
基金Shanghai Municipal Natural Science Foundation,China(No.16ZR1401700)Innovation Experiment Project for University Student of Donghua University,China(No.hsxy10201708)
文摘Nitrogen-doped graphene quantum dots( N-GQDs)exhibiting excitation-independent green fluorescence emission( 536 nm) was facilely synthesized. The as-prepared N-GQDs showed a highly selective fluorescence quenching response toward Hg2 + with a linear range of 0. 1-30. 0 μmol/L and detection limit of50 nmol/L. Based on the high affinity of biothiols( such as cysteine)toward Hg2 +, the quenched fluorescence of N-GQDs could be recovered upon addition of biothiols,and thereby a new fluorescence turn-on probe for cysteine detection was further developed. The linear range and detection limit for cysteine were found to be 0. 1-12. 5 μmol/L and 46 nmol/L,respectively. The present fluorescent probe worked well in a physiological pure water medium,allowing a fluorescence imaging of cysteine in living cells.
