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Ag-location-based color-tunable fluorescent AuAg nanoclusters for 'turn-on' and 'turn-off' detection of l-cysteine
- Source :
- Sensors and Actuators B: Chemical. 284:695-703
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- The color-tunable AuAg nanoclusters (AuAg NCs) are designed by adjusting the location of Ag element, in which β-lactoglobulin (β-Lg) serves as the capping and reducing agent. The mono-metal Au NCs emit red-fluorescent emission (red-Au NCs@β-Lg); however, the stronger metallophilic interaction between Au and Ag facilitate the smaller size, and then the bimetal AuAg NCs@β-Lg present yellow emission (yellow-AuAg NCs@β-Lg). A “Ag+ shell” outside the AuAg NCs@β-Lg cause the emission change to orange (orange-AuAg NCs@β-Lg-Ag+). This is the first time for Ag+ to tune continuously the emission wavelength of AuAg NCs. TEM proves that the size of particle has a close relationship with the fluorescence emissions. l -cysteine (Cys) stabilized the protective effect of β-Lg and shows a “turn on” effect on the fluorescence intensity of yellow-AuAg NCs@β-Lg. In contrary, the strong interaction between Cys and Ag+ destroys the protection of β-Lg to the core of yellow-AuAg NCs@β-Lg and shows a distinct “turn off” effect on the fluorescence intensity of orange-AuAg NCs@β-Lg-Ag+. The above phenomenon has been successfully applied to the detection of Cys in the Hela cells. This location-based color-tunable strategy is expected to open up a new potential to improve the performance of NCs.
- Subjects :
- Materials science
Reducing agent
Metals and Alloys
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Photochemistry
01 natural sciences
Fluorescence
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Nanoclusters
Bimetal
Fluorescence intensity
Turn off
Close relationship
Materials Chemistry
Electrical and Electronic Engineering
0210 nano-technology
Instrumentation
Cysteine
Subjects
Details
- ISSN :
- 09254005
- Volume :
- 284
- Database :
- OpenAIRE
- Journal :
- Sensors and Actuators B: Chemical
- Accession number :
- edsair.doi...........43ec5af766802ab679d3135ef4fb13a1