Effect of the Elemental Composition of Precursors from Amino Acids and Their Binary Mixtures on the Photoluminescent Intensity of Carbon Nanodots

Abstract

Experimental ReagentsGlycine (Sigma Aldrich, ≥99%), L-glutamic acid (Sigma Aldrich, ≥99.0%), and L-cysteine (Sigma Aldrich, 97.0%) were used as received. 2-Morpholinoethanesulfonic acid monohydrate 2017 © The Japan Society for Analytical Chemistry † To whom correspondence should be addressed. E-mail: kotaro@sci.toho-u.ac.jp Effect of the Elemental Composition of Precursors from Amino Acids and Their Binary Mixtures on the Photoluminescent Intensity of Carbon NanodotsKotaro MORITA, † Shusei KURUSU, Haruka KODAMA, and Naoki HIRAYAMA Department of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi 274-8510, JapanWe report on the photoluminescent (PL) properties of carbon nanodots (CNDs) doped with nitrogen and sulfur obtained by the pyrolytic carbonization of amino acids as precursors. Prepared CNDs exhibit stable PL emission under a wide variety of aqueous conditions. The results also provided the way to tune a PL intensity of CNDs by varying the amount of heteroatoms in precursors with a binary mixture of amino acids. The PL quantum yields of the obtained CNDs were determined to be from 0.079 to 0.571.

Precursor Concentration Effect on Optical Properties of Carbon Dots from Cassava’s Peels

“…The precursor concentration also affects the relationship between lifetime and PL intensity. Although the PL mechanism and the electronic nature of C-dots are not fully understood, and it is often proposed that PL of C-dots can be associated with radiation recombination of electrons and holes trapped on the surface of C-dots (Morita, Kurusu, Kodama, & Hirayama, 2017). These results provide the potential for C-dots of cassava's peels in aqueous solutions can be applied as cellular bioimaging in vivo and in vitro and biosensing metal ions and salts.…”

Capillary Electrophoretic Characterization of Water-soluble Carbon Nanodots Formed from Glutamic Acid and Boric Acid under Microwave Irradiation

“…After heating, the crude product was cooled to room temperature and dispersed in water, followed by centrifugation at 4,000 ×g for 20 min. 7 The supernatant was treated with a molecular weight cutoff membrane (Amicon Ultra-4, Millipore), as equivalent to < 10 kDa, and thus BG-CND dispersed solution was prepared; 7 the cloudy solution of raw CND got clear by the treatments. G-CND was also synthesized with a similar manner to BG-CND employing a single precursor of 1.0 g glutamic acid.…”

“…6 Nitrogen-contained and sulfur-contained CNDs were also prepared from amino acids. 7 Doping of N or S to CNDs developed the quantum yield. 7 Graphene quantum dots have been used as an additive in capillary electrophoresis, and the resolutions of cinnamic acids and its derivatives were developed through the aromatic-aromatic interactions.…”

“…7 Doping of N or S to CNDs developed the quantum yield. 7 Graphene quantum dots have been used as an additive in capillary electrophoresis, and the resolutions of cinnamic acids and its derivatives were developed through the aromatic-aromatic interactions. 8 The CNDs have been characterized by physical and spectroscopic analyses including SEM, TEM, XRD, IR, Raman, XPS, MALDI-TOF-MS, TGA, etc.…”

“…15 In this study, the present authors prepared the CNDs from boric acid and glutamic acid by microwave irradiation, as well as from glutamic acid, since the introduction of hetero atoms can develop the quantum yield of CNDs. 7 The prepared CNDs are abbreviated as BG-CND and G-CND, respectively. Although boron-doped CND was synthesized from boric acid and sucrose by Sadhanala and Nanda, only photoluminescence and CND size were examined.…”