Open AccessOptical graphene quantum dots gas sensors: experimental study
Author(s) -
Davoud Raeyani,
S. Shojaei,
Sohrab Ahmadi-Kandjani
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab637e
Subject(s) - graphene , quantum dot , materials science , scanning electron microscope , absorbance , photoluminescence , transmission electron microscopy , nanotechnology , spectroscopy , analytical chemistry (journal) , optoelectronics , chemistry , composite material , physics , chromatography , quantum mechanics
We present a room temperature Graphene Quantum Dots (GQDs) based optical gas sensor for carbon dioxide gas detection. GQDs were prepared by a hydrothermal method and deposited on a quartz substrate using a drop-casting technique. The size of synthesized GQDs is in the range of 10 to 20 nm. GQDs films were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), photoluminescence (PL) and UV-Vis absorption spectroscopy. The gas sensing measurements were studied using optical absorbance changes of GQDs film upon exposure to different concentrations of CO 2 gas. The as-prepared gas sensor showed a significant sensitivity with a partially reversible response to CO 2 gas, indicating its great potential to pave a way toward a novel CO 2 gas sensor.