Optical graphene quantum dots gas sensors: Theoretical study

Raeyani, D.; Shojaei, S.; Ahmadi-Kandjani, Sohrab

doi:10.1016/j.spmi.2017.12.050

Cited by 36 publications

(25 citation statements)

References 50 publications

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“…We reported a good performance for CO 2 gas sensing which has a good agreement with our previous theoretical study [30]. Also, in our previous experimental work [31], the sensing study of water-soluble GQDs by analyzing the photoluminescence spectra of GQDs, diluted with carbonated water compare with deionized water was performed and significant results obtained which encouraged us to explore gas sensing properties of GQDs film using optical absorption spectroscopy.…”

Section: Introductionsupporting

confidence: 85%

“…Also, the response-recovery curves of the sensor at the absorption wavelength of 310 nm show a greater increase by CO 2 gas exposure ( figure 6(b)). Increasing of optical absorbance in longer wavelengths is also shown in the UV-Vis absorption spectra of GQDs exposed to air and pure CO 2 gas (inset of figure 6), reported in reference [30].…”

Section: Resultssupporting

confidence: 53%

“…This dynamic test was also repeated at 260 nm and the same results are observed. Dynamic tests for nitrogen gas were also investigated, and the GQDs gas sensor didn't show much sensitivity to it [30]. During the experiments, to eliminate the impact of oxygen gas in the air, we used Argon as a recovery gas but it didn't show much impact on sensor recovery.…”

Section: Resultsmentioning

confidence: 99%

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Optical graphene quantum dots gas sensors: experimental study

Raeyani

Shojaei

Ahmadi-Kandjani

2020

Mater. Res. Express

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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.

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Section: Introductionsupporting

confidence: 85%

Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 99%

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Optical graphene quantum dots gas sensors: experimental study

Raeyani

Shojaei

Ahmadi-Kandjani

2020

Mater. Res. Express

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“…Graphene quantum dots (GQDs) are graphenes with finite size, which can be fabricated by bottom-up and top-down synthesis approaches [1,2]. Several theoretical studies were already performed studying the electronic and optical properties of GQDs [3][4][5][6][7], analyzing the influence of size, shape, functional groups and gas adsorption on electronic and optical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Many experimental approaches investigate its applications due to their fascinating optical properties, such as photoluminescence, photoinduced electron transfer, chemiluminescence, and electrochemiluminescence [10][11][12][13]. Nevertheless not many theoretical attempts have been performed in order to have a reliable representation of this type of structures, and classical corone model to describe its properties do not have a suitable absorption behavior in the UV-visible region [5].…”

Section: Introductionmentioning

confidence: 99%

Density functional theory model for carbon dot surfaces and their interaction with silver nanoparticles

Ambrusi

Arroyave

Centurión

et al. 2019

Physica E: Low-dimensional Systems and Nanostructures

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Density functional theory (DFT) and time dependent density functional theory (TDDFT) calculations were performed to represent carbon dots surfaces. The addition of different oxygen functional groups to the aromatic carbon core structure and the stability in the interaction with silver nanoparticles was also investigated. Adsorption energies were evaluated in order to compare the competition for adsorption sites on silver surface with D-glucose and D-gluconate ion molecules. The -COOH and -COO groups and the interaction of the latter with silver were proposed to explain some features of the UV-visible absorption spectra, which could also contribute to an explanation for the charge observed on carbon dot surfaces.

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Synthesis of luminescent graphene quantum dots from biomass waste materials for energy‐related applications—An overview

et al. 2022

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A review of the current developments in the synthesis of graphene fragments of porous carbon material by utilizing green precursors in the form of graphene quantum dots (GQDs) and their applications in energy storage devices such as supercapacitors, batteries, fuel cells, and solar cells is presented in this study. Two different approaches, including top‐down and bottom‐up, are discussed. The experimental approaches include hydrothermal or solvothermal method, microwave‐assisted method, electrochemical oxidation, controllable synthesis, oxidative cleavage, and carbonization from small molecules or polymers. The advantages and disadvantages of the green synthesis of GQDs are discussed. Current challenges and prospective applications of GQDs in energy‐related areas are presented. A brief outlook is provided for addressing the problems for further advancement of GQDs. It is anticipated that the results discussed in this study will lead to a better understanding of GQDs as well as their significant roles in developing innovative strategies and applications.

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Optical graphene quantum dots gas sensors: Theoretical study

Cited by 36 publications

References 50 publications

Optical graphene quantum dots gas sensors: experimental study

Optical graphene quantum dots gas sensors: experimental study

Density functional theory model for carbon dot surfaces and their interaction with silver nanoparticles

Synthesis of luminescent graphene quantum dots from biomass waste materials for energy‐related applications—An overview

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