A photoelectrochemical sensor based on β‐cyclodextrin‐modified MoS2 quantum dots‐WS2 nanosheet composites for the detection of benzo [a]pyrene

A photoelectrochemical sensor has been developed for the detection of the polycyclic aromatic hydrocarbon pollutant benzo [a]pyrene (BaP). An n‐butyl lithium intercalation stripping method is applied to prepare tungsten disulphide nanosheets (WS2 NSs). WS2 NSs and β‐cyclodextrin (β‐CD)‐modified MoS2...

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Bibliographic Details
Published inMicro & nano letters Vol. 17; no. 6; pp. 125 - 133
Main Authors Shi, Jian‐Jun, Wang, Zhe, Wang, Yan, Shu, Rui‐Wen, Yang, Ping
Format Journal Article
LanguageEnglish
Published Stevenage John Wiley & Sons, Inc 01.05.2022
Wiley
Subjects
Aromatic hydrocarbons
benzo [a]pyrene (BaP) detection
Butyllithium
Chemical bonds
Cyclodextrins
Electrons
Energy levels
Hydrogen bonding
Hydroxyl groups
Indium tin oxides
Lithium
Molybdenum disulfide
Nanocomposites
Nanosheets
Photoelectric effect
Photoelectric emission
Photoelectricity
photoelectrochemical sensor
Pollutants
Quantum dots
Sensors
Tungsten disulfide
tungsten disulphide nanosheets
β‐cyclodextrin
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Summary:A photoelectrochemical sensor has been developed for the detection of the polycyclic aromatic hydrocarbon pollutant benzo [a]pyrene (BaP). An n‐butyl lithium intercalation stripping method is applied to prepare tungsten disulphide nanosheets (WS2 NSs). WS2 NSs and β‐cyclodextrin (β‐CD)‐modified MoS2 quantum dots (QDs) are then compounded by hydrogen bonding between the amino and hydroxyl groups. After assembly on an indium tin oxide electrode, the energy level matching and synergistic photoelectric effect between β‐CD‐MoS2 QDs and WS2 NSs reduced the combination of photogenerated electrons and holes and an enhanced photocurrent signal is observed. As a result of the host–guest interaction between β‐CD and BaP, BaP could bind to the β‐CD‐MoS2 QDs in the nanocomposites, which hinders the electron migration to the electrode and weakened the photocurrent signal. Thus, the trace detection of BaP is realized. The rate of photocurrent change is also related to the BaP concentration from 1 to 20 nmol/L with a detection limit of 0.33 nmol/L. In summary, a highly sensitive and selective photoelectrochemical sensor for the detection of BaP is successfully constructed.
ISSN:1750-0443
1750-0443
DOI:10.1049/mna2.12110