Dhenadhayalan NLin T.-WLee H.-LKING-CHUEN LIN2021-08-032021-08-03201825740970https://www.scopus.com/inward/record.uri?eid=2-s2.0-85058428179&doi=10.1021%2facsanm.8b00634&partnerID=40&md5=649e5cb4f3d5a0fa1a7746264d632e39https://scholars.lib.ntu.edu.tw/handle/123456789/575799Several distinct surface-functionalized molybdenum diselenide (MoSe2) quantum dots (QDs) were developed as chemosensors based on the fluorescent probe. The carboxylic-, amine-, and thiol-functionalized MoSe2 QDs (MoSe2/COOH, MoSe2/NH2, and MoSe2/SH) were synthesized by tuning their surface with thiol-containing capping agents. These MoSe2/COOH and MoSe2/NH2 QD sensors were implemented for the highly selective and sensitive detection of copper ion (Cu2+) and 2,4,6-trinitrophenol (TNP) with a lower detection limit of 4.6 and 45.3 nM, respectively. Similarly, the MoSe2/SH QDs while coupled with gold nanoparticles showed excellent selectivity toward melamine (MA) with a lower detection limit of 27.7 nM. It is surprising to find that each functionalized QD exhibits a distinct sensing mechanism in the detection of Cu2+, TNP, and MA, based on metal-ion-induced fluorescence turn-on, electron transfer, and energy transfer suppression, respectively. Moreover, these MoSe2 QD-based chemosensors were successfully utilized in real samples, confirming their propitious application. ? 2018 American Chemical Society.Energy transfer; Fluorescence; Gold nanoparticles; Melamine; Metal ions; Molybdenum compounds; Nanocrystals; Semiconductor quantum dots; Transition metals; Tuning; 2,4,6-trinitrophenol; Chemo-sensors; Fluorescent probes; Lower detection limit; Molybdenum diselenide; Sensitive detection; Surface functional groups; Transition metal dichalcogenides; Selenium compounds[SDGs]SDG7journal article10.1021/acsanm.8b006342-s2.0-85058428179