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The design of room-temperature-phosphorescent carbon dots and their application as a security ink
- Source :
- Journal of Materials Chemistry C. 7:10605-10612
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- Room temperature phosphorescent (RTP) carbon dots have attracted considerable interest due to their fundamental importance and potential applications in optoelectronic devices, sensing, bioimaging and document security. The preparation method of RTP carbon dots is based on the formation of the CN (or CO) groups and hydrogen bond. Herein, we have added acrylamide in the reaction system to form hydrogen bonds and stabilize the triplet excitons. Thus, the nontoxic RTP carbon dots (NCDs) were designed and prepared via a one-step hydrothermal method. The nitrogen element (N) in the NCDs can effectively increase their fluorescence intensity, while the produced CN bonds promote the formation of triplet excitons. More importantly, the acrylic amide and the as-generated polyacrylamide (PAM) on the surface of NCDs could easily connect with the as-prepared pyridinic N via the reaction between citric acid and urea, and formed the hydrogen bond that could stablilize the triplet excitons. Hence, NCDs exhibit stable phosphorescence properties. We further show the promising application of the as-prepared aqueous NCDs as a new smart concealed and potential security ink.
- Subjects :
- Materials science
Aqueous solution
Hydrogen bond
Exciton
Polyacrylamide
chemistry.chemical_element
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Nitrogen
0104 chemical sciences
chemistry.chemical_compound
chemistry
Amide
Materials Chemistry
0210 nano-technology
Phosphorescence
Carbon
Subjects
Details
- ISSN :
- 20507534 and 20507526
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry C
- Accession number :
- edsair.doi...........803591c774ecbe7b244e38aff797966d