Molybdenum disulfide quantum dots（MoS2QDs） were synthesized via a hydrothermal method using sodium molybdate and cysteine as molybdenum and sulfur sources, respectively. The optimal hydrothermal time was studied. Fu...Molybdenum disulfide quantum dots（MoS2QDs） were synthesized via a hydrothermal method using sodium molybdate and cysteine as molybdenum and sulfur sources, respectively. The optimal hydrothermal time was studied. Furthermore, the as synthesized water-soluble MoS2QDs were used as a fluorescence probe for the sensitive and selective detection of copper ions. The fluorescence of the MoS2QDs was quenched after the addition of copper ions; the reason may be that the transfer of the excited electron from QDs to copper ions leads to the reduction of the radiative recombination.The fluorescence quenching of MoS2QDs is linearly dependent on the copper ions concentration ranging from 0.1 μM to600 μM, the limit of detection is 0.098 μM, which is much lower than that of existing methods. Moreover, the MoS2QDs show highly selectivity towards the detection of copper ions.展开更多
基金Project supported by the National Key R&D Program of China(Grant No.2016YFA0202302)the National Natural Science Foundation of China(Grant Nos.61335006,61527817,and 61378073)+1 种基金the Overseas Expertise Introduction Center for Discipline Innovation,111 Center,Chinathe National Basic Research Program of China(Grant No.KSJB17030536)
文摘Molybdenum disulfide quantum dots（MoS2QDs） were synthesized via a hydrothermal method using sodium molybdate and cysteine as molybdenum and sulfur sources, respectively. The optimal hydrothermal time was studied. Furthermore, the as synthesized water-soluble MoS2QDs were used as a fluorescence probe for the sensitive and selective detection of copper ions. The fluorescence of the MoS2QDs was quenched after the addition of copper ions; the reason may be that the transfer of the excited electron from QDs to copper ions leads to the reduction of the radiative recombination.The fluorescence quenching of MoS2QDs is linearly dependent on the copper ions concentration ranging from 0.1 μM to600 μM, the limit of detection is 0.098 μM, which is much lower than that of existing methods. Moreover, the MoS2QDs show highly selectivity towards the detection of copper ions.
基金National Natural Science Foundation of China(21767009)China Scholarship Council(201808420149)+1 种基金Hubei Key Laboratory of Biological Resources Protection and Utilization(PKLHB1908)Undergraduate Innovation Program(201910517006)
