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MoS2-Based Nanoprobes for Detection of Silver Ions in Aqueous Solutions and Bacteria
- Yang, Yu, Liu, Teng, Cheng, Liang, Song, Guosheng, Liu, Zhuang, Chen, Meiwan
- ACS applied materials 2015 v.7 no.14 pp. 7526-7533
- antibiotics, aqueous solutions, bacteria, fluorescence, human health, ions, isothiocyanates, metal ions, nanosheets, nanosilver, silver, sulfides
- Silver as an extensively used antibacterial agent also poses potential threats to the environment and human health. Hence, in this work, we design a fluorescent nanoprobe by using rhodamine B isothiocyanate (RhoBS) adsorbed MoS₂ nanosheets to realize sensitive and selective detection of Ag⁺. On the surface of RhoBS-loaded MoS₂ nanosheets, Ag⁺ can be reduced to Ag nanoparticles, which afterward could not only lead to the detachment of RhoBS molecules and thus their recovered fluorescence but also the surface-enhanced fluorescence from RhoBS remaining adsorbed on MoS₂. Such an interesting mechanism allows highly sensitive detection of Ag⁺ (down to 10 nM) with great selectivity among other metal ions. Moreover, we further demonstrate that our MoS₂–RhoBS complex could act as a nontoxic nanoprobe to detect Ag⁺ in live bacteria samples. Our work resulted from an unexpected finding and suggests the promise of two-dimensional transition-metal sulfide nanosheets as a novel platform for chemical and biological sensing.