Synthesizing Graphene Quantum Dots for Gas Sensing Applications

Raeyani, D.; Shojaei, S.; Kandjani, S. Ahmadi; Włodarski, W.

doi:10.1016/j.proeng.2016.11.356

Cited by 35 publications

(22 citation statements)

References 10 publications

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“…Moreover, the angled shape of edge sides is proof of the low oxidation rate and the formation of fewer functional groups on synthesized GQDs. The low oxidation rate in hydrothermally synthesized GQDs also reported in our previous work using UV-Vis absorption spectroscopy [31] and probably it increases the aggregation possibility. Figure 2(b) shows the TEM image of non-dialyzed GQDs.…”

Section: Resultssupporting

confidence: 69%

“…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. Different concentrations of CO 2 gas were examined to obtain the limit of detection.…”

Section: Introductionsupporting

confidence: 85%

“…GQDs were synthesized using a hydrothermal process of graphite intercalation compounds (GICs) according to the well-known procedure. [31,32]. Graphite mixed and ground with potassium sodium tartrate (organic salt) at a mass fraction ratio of 10:1 (such as 2 g graphite with 20 g potassium sodium tartrate).…”

Section: Synthesis Of Gqdsmentioning

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: Resultssupporting

confidence: 69%

Section: Introductionsupporting

confidence: 85%

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Optical graphene quantum dots gas sensors: experimental study

Raeyani

Shojaei

Ahmadi-Kandjani

2020

Mater. Res. Express

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“…InAs, InP) in the periodic table [21]. Moreover, QDs of Si, Ge, Ag, also of carbon and graphene [22][23][24] and ternary QDs (from I-VI) have been reported [25,26]. QDs have received much attraction because of their stable, tunable, bright and narrow photoemission, high chemical and photo bleaching stability, processability and surface functionality and they offer many advantages in comparison with conventional fluorophore.…”

Section: Quantum Dotsmentioning

confidence: 99%

Mn-Doped ZnSe Quantum Dots as Fluorimetric Mercury Sensor

Parani¹,

Tsolekile²,

May³

et al. 2018

Nonmagnetic and Magnetic Quantum Dots

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Quantum dots (QDs), because of their exciting optical properties, have been explored as alternative fluorescent sensors to conventional organic fluorophores which are routinely employed for the detection of various analytes via fluorometry. QD probes can detect toxic metal ions, anions, organic molecules with good selectivity and sensitivity. This chapter investigates the synthesis of Mn-doped ZnSe QDs using nucleation-doping strategy. The as-synthesized QDs were characterized by various analytical tools such as ultravioletvisible (UV-vis) absorption, photoluminescence (PL) spectroscopy, X-ray diffractometry (XRD) and transmission electron microscopy (TEM). It was found that Mn doping of QDs significantly increases the PL intensity. The PL of the resulting QDs was examined in the presence of different metal ions to check its selective response. Among the various metal . Thus, the present Mn-doped ZnSe QDs represent a simple, non-toxic fluorescent probe for the qualitative and quantitative detection of mercury ions in aqueous samples.

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“…Gas and/or VOC sensing is a recent area of interest for quantum dots . Gas sensing for semiconductor sensors is based on interactions on the surface of the sensor such as adsorption‐desorption (reduction‐oxidation) which generates an electrical signal upon contacting with a gas or vapor .…”

Section: Introductionmentioning

confidence: 99%

PS/PMMA‐CdSe/ZnS Quantum Dots Hybrid Nanofibers for VOCs Sensors

Luis

Aguirreurreta

Pardo

et al. 2018

Israel Journal of Chemistry

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Hybrid nanofibers containing CdSe/ZnS quantum dots have been produced by electrospinning of hybrid latexes to characterize the electro-optical behavior of this novel luminescent sensing material. The latexes are synthesized by seeded semi-batch emulsion polymerization yielding crosslinked core-shell PS/QDs/PMMA particles with efficiently encapsulated quantum dots guaranteeing a good optical stability. Addition of polyvinyl alcohol (PVA) or polyethylene oxide (PEO) to the latexes is necessary to produce polymeric dispersions suitable for electrospinning manufacture of the nanometric fibers. The optimized polymeric dispersions are successfully electrospun obtaining fluorescent nanofibers in both cases. The hybrid nanofibers are sensitive to selected solvents (acetone, methanol and THF) and present positive response making them good candidates for the production of VOC sensors.

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Synthesizing Graphene Quantum Dots for Gas Sensing Applications

Cited by 35 publications

References 10 publications

Optical graphene quantum dots gas sensors: experimental study

Optical graphene quantum dots gas sensors: experimental study

Mn-Doped ZnSe Quantum Dots as Fluorimetric Mercury Sensor

PS/PMMA‐CdSe/ZnS Quantum Dots Hybrid Nanofibers for VOCs Sensors

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