Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 10, Pages 7790-7796Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am501053n
Keywords
nanoparticles; white upconversion luminescence; simultaneous detection; nitroaromatic explosives
Funding
- National Natural Science Foundation of China [21275015]
- State Key Project of Fundamental Research of China [2011CBA00503, 2011CB932403]
- Program for New Century Excellent Talents in University of China [NCET100213]
- Science Foundation of Xinjiang Uygur Autonomous Region [201191170]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry)
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1205]
- Foundational Research Funds for the Central University [ZZ1321]
- Public Hatching Platform for Recruited Talents of Beijing University of Chemical Technology
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A highly water stable and strong upconversion (UC) luminescence NaYF4@PSI-NH nanosensor for the simultaneous and selective detection of 2,4,6-trinitrotoluene (TNT) and 2,4,6-trinitrophenol (TNP) was successfully developed. Via the 980 nm near-infrared (NIR) irradiation, these nanosensors emit strong white UC luminescence with five typical emission peaks centered at 363, 455, 475, 546, and 654 nm. The UC emission at both 363 and 546 nm was quenched by the addition of TNT; however, the ratio of luminescence intensity at 363 nm to 546 nm (I-363/I-546) had no change with the increase of TNT concentration. Meanwhile, only violet UC emission at 363 nm was dramatically quenched via the addition of TNP, and the I-363/I-546 ratio is negatively proportional to the TNP concentration in the range of 0.01-4.5 mu g/mL of TNP. On the other hand, the green UC emission intensity at 546 nm is in negative proportion to the concentration of TNT. Moreover, cyclohexane, toluene, and other nitroaromatics (such as 2,4-dinitrotoluene (DNT) and nitrobenzene (NB)) have no influence on the detection. Therefore, we developed a facile method for the simultaneous and selective detection of TNT and TNP in the mixture solution of nitroaromatics independent of complicated instruments and sample pretreatment.
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