Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 14, Pages 7526-7533Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01222
Keywords
MoS2 nanoSheets; selectivity; sensitivity; detection; bacteria
Funding
- National Natural Science Foundation of China [51222203, 51132006]
- National 973 Program of China [2011CB911002, 2012CB932601]
- Jiangsu Natural Science Fund for Distinguished Young Scholars
- Macao Science and Technology Development Fund [062/2013/A2]
- Research Fund of the University of Macau [MYRG2014-00033-ICMS-QRCM, MYRG2014-00051-ICMS-QRCM]
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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 MoS(22)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 MoS(2)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.
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