Optical and electrochemical tuning of hydrothermally synthesized nitrogen-doped carbon dots

Abstract

Using a novel hydrothermal synthesis, nitrogen-doped carbon dots were synthesized and shown to exhibit tunable optical and electrochemical properties.

Application of high-efficiency green fluorescent carbon dots prepared by acid catalysis in multicolour LEDs

“…The absorption peaks at 200–280 nm were attributed to the eigenstate (π–π*) transition in the aromatic domain (C C). 23 The absorption peaks at 280–350 nm were assigned to the C O eigenstate (n–π*) transition. 24 Compared with that of CDs-0, the absorption peaks of CDs treated with acid were significantly redshifted, especially those of CDs-1 and CDs-3.…”

Microwave-Assisted Grafting of Coal onto Nitrogen-Doped Carbon Dots with a High Quantum Yield and Enhanced Photoluminescence Properties

“…Quantum yield (QY) determination was conducted following a previously established procedure. Quinine sulfate (literature QY 0.54 at 340 nm), anthracene literature (QY 0.27 at 340 nm), and Rhodamine B (literature QY 0.31 at 340 nm) were chosen as reference standards for comparison [ 10 ]. The QYs of the coal-based CDs were calculated by comparing their integrated photoluminescence intensity (excited at 340 nm) and absorbance value (at 340 nm) with those of the reference standards using the following equation [ 1 , 2 , 3 ]: …”

“…Carbon dots (CDs) are a rising star in the family of carbon nanoparticles and have garnered extensive attention due to their luminescent properties [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. The past decade has witnessed rapid development in carbon dots (CDs) owing to their diverse sources, including (a) fullerene; (b) graphite; (c) graphene oxide; (d) carbon nanotubes; (e) carbohydrates; etc., as well as significant advantages, such as (a) elemental abundance; (b) hypotoxicity; (c) chemical inertness; (d) outstanding biocompatibility; (e) unique physical properties; (f) affordability; and so on [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Various methods are commonly used to synthesize fluorescent CDs, such as (a) electrochemical synthesis processes; (b) chemical oxidation methods; (c) hydrothermal cutting strategies; (d) carbonizing organics routes; (e) laser ablation of graphite; (f) ultrasonic methods; (g) hydrothermal; (h) solvothermal; (i) microwave-assisted pyrolysis; etc.…”

Nitrogen-Doped Carbon Quantum Dots for Biosensing Applications: The Effect of the Thermal Treatments on Electrochemical and Optical Properties

“…Nitrogen-doped CDs (N-CDs) were prepared according to a previous reported route [37]. An amount of 2 g (10 mmol) of citric acid and 1.9 g (30 mmol) of urea were dissolved in 50 mL of deionized water, transferred into a Teflon-lined stainless steel reactor (100 mL) and heated at 160 • C for 4 h. After the reactor was cooled to room temperature naturally, the solution was filtrated through a microporous membrane (0.22 µm) to remove the large particles and precipitated with EtOH followed by centrifugation.…”