Visualizing Gaseous Nitrogen Dioxide by Ratiometric Fluorescence of Carbon Nanodots–Quantum Dots Hybrid

Abstract

A novel nanohybrid ratiometric fluorescence probe for on-site and visual determination of nitrogen dioxide (NO2) has been designed. The hybrid probe comprises blue-colored fluorescence carbon nanodots (CDs) and red-colored emission CdTe quantum dots (QDs). Such hybridized probe exhibits dual emission bands centered at 460 and 665 nm, respectively. The blue fluorescence of CDs is insensitive to the analyte, whereas the red emission of QDs is specifically quenched by the analyte, resulting in a distinguishable color change from orange-red to blue upon exposure to NO2. The limit of detection for nitrogen dioxide is estimated to be 19 nM in aqueous solution. More importantly, the nanohybrid probe has been successfully applied in visual detection of gaseous NO2 with a detection limit of 1 ppm, suggesting its potential application for NO2 sensing.

Alkaline-Earth Metals-Doped Pyrochlore Gd2Zr2O7 as Oxygen Conductors for Improved NO2 Sensing Performance

“…To monitor NO 2 emission, great efforts are devoted to develop high performance and compact solid electrolyte type NO 2 sensor with a sensitive, stable, selective and quick response 4–11 . As to NO 2 sensors, the solid electrolytes play a very important role in the sensing performances.…”

Luminescent assays based on carbon dots for inorganic trace analysis

“…In addition, Yan et al (2015) reported a novel nanohybrid ratiometric fluorescence probe for NO 2 determination. This system uses blue-colored CDs in conjunction with red-colored QDs.…”

Influence of defect on the electrical and optical properties of A-site non-stoichiometry Ca0.67La0.22□0.11Ti(1−x)CrxO3−δ perovskite

“…1 To monitor NO X emission, lots of efforts have been made to develop high performance and compact solid electrolyte NO X type sensors with a stable, sensitive, selective and quick response. [2][3][4][5][6][7][8] Yttrium Stabilized Zirconia Y 4x Zr 1À4x O 2À2x (YSZ) has exceptionally high ionic conductivity but only at a temperature beyond 800 C. Its high operating temperature, however, can lead to many problems; it limits the selection of compatible electrodes and interconnect materials 9 and reduces the service life of the sensor. 10 Thus, it is urgent to search for an alternative oxide electrolyte material that can capture NO X at a mild temperature.…”