期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 9, 页码 5462-5470出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5091534
关键词
hydrogen sulfide; imaging; luminescence; nanoparticles; sensors
资金
- National Basic Research Program of China [2012CB933301]
- National Natural Science Foundation of China [21171098, 21174064, 61136003]
- Program for New Century Excellent Talents in University [NCET-12-0740]
- Ministry of Education of China [IRT1148, 20133223110006]
- Natural Science Foundation of Jiangsu Province of China [BK20130038, BM2012010]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [YX03001]
We design a nanohybrid for the detection of hydrogen sulfide (H2S) based on mesoporous silica nanoparticles (MSNs). A phosphorescent iridium(III) complex and a specific H2S-sensitive merocyanine derivative are embedded into the nanohybrid. It exhibits a unique dual emission that is ascribed to the iridium(III) complex and the merocyanine derivative, respectively. Upon addition of sodium hydrogen sulfide (NaHS), the emission from the merocyanine derivative is quenched, while the emission from the iridium(III) complex is almost unchanged, which enables the ratiometric detection of H2S. Additionally, the nanohybrid has a long luminescence lifetime and displays a significant change in luminescence lifetime in response to H2S. Intracellular detection of H2S is performed via ratiometric imaging and photoluminescence lifetime imaging microscopy. Compared with the intensity-based method, the lifetime-based detection is independent of the probe concentration and can efficiently distinguish the signals of the probe from the autofluorescence in complex biological samples.
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