Optical characteristics of a RF DBD plasma jet in various 
                
                  
                
                $$\hbox {Ar}/\hbox {O}_{2}$$
                
                  
                    
                      Ar
                      /
                      
                        O
                        2
                      
                    
                  
                
               mixtures

Falahat, Amir; Ganjovi, Alireza; Taraz, Majid; Ravari, Mohammad Nasir Rostami; Shahedi, Abdolhamed

doi:10.1007/s12043-018-1520-6

Cited by 18 publications

(7 citation statements)

References 32 publications

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“…To further understand the reactive species in plasma, optical emission spectroscopy (OES) was performed in situ (Figure S3). The highest emission lines in the discharge medium of the plasma jet are related to atomic oxygen [OI, 3p 2 → 3s 2 , (777.42 nm) and 3p 2 → 3s 1 , (844.64 nm)], which means that a large number of active oxygen atoms and excited oxygen molecules exist in the plasma state. , OES further confirms that just the active oxygen species etch the surface of PBA, causing the lattice distortion of crystal cells. However, how to explain this lattice distortion phenomenon, oxygen vacancies, breaking of CN bonds, or doped oxygen atoms?…”

Section: Resultsmentioning

confidence: 74%

In Situ Charge Modification within Prussian Blue Analogue Nanocubes by Plasma for Oxygen Evolution Catalysis

Wang

Cao

2023

Inorg. Chem.

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A targeted defect-induced strategy of metal sites in a porous framework is an efficient avenue to improve the performance of a catalyst. However, achieving such an activation without destroying the ordered framework is a major challenge. Herein, a dielectric barrier discharge plasma can etch the Fe(CN) 6 group of the NiFe Prussian blue analogue framework in situ through reactive oxygen species generated in the air. Density functional theory calculations prove that the changed local electronic structure and coordination environment of Fe sites can significantly improve oxygen evolution reaction catalytic properties. The modified NiFe Prussian blue analogue is featured for only 316 mV at a high current density (100 mA cm −2 ), which is comparable to that of commercial alkaline catalysts. In a solar cell-driven alkaline electrolyzer, the overall electrolysis efficiency is up to 64% under real operation conditions. Over 80 h long-time continuous test under 100 mA cm −2 highlights superior durability. The density functional theory calculations confirm that the formation of OOH* is the rate-determining step over Fe sites, and Fe(CN) 6 vacancy and extra oxygen atoms can introduce charge redistribution to the catalyst surface, which finally enhances the oxygen evolution reaction catalytic properties by reducing the overpotential by 0.10 V. Both experimental and theoretical results suggest that plasma treatment strategy is useful for modifying the skeletal material nondestructively at room temperature, which opens up a broad prospect in the field of catalyst production.

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Section: Resultsmentioning

confidence: 74%

In Situ Charge Modification within Prussian Blue Analogue Nanocubes by Plasma for Oxygen Evolution Catalysis

Wang

Cao

2023

Inorg. Chem.

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“…The diffuse regime is more easily obtained in gases such as helium, neon and nitrogen or mixtures of inert gases with molecular oxygen, nitrogen, among others (FALAHAT et al, 2018). It is an important regime for the process at atmospheric pressure, when uniformity of the changes generated by the plasma on the materials is desired.…”

Section: Diffuse Regimementioning

confidence: 99%

“…This technique is essentially based on the analysis of light emitted by different species, such as neutral or ionized atoms, radicals or molecules from the plasma discharge medium. Furthermore, EEO is used for the characterization of excited species, the determination of the photon flux as a function of wavelength and as a diagnosis of the charged particle beam (FALAHAT et al, 2018).…”

Section: Sourcementioning

confidence: 99%

Analysis of Parameters and Identification of Chemical Species Present in Plasma Jets From the Excitation of Helium and Argon for Dental Purposes

Cruz,

Guerra,

Cachina

et al. 2024

JER

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“…The OES of pure Ar shows a weak emission of O atom at 777 nm (as shown in the inset of figure 3(a)) and N 2 emission between the wavelength range 350-450 nm. The presence of nitrogen and oxygen in pure argon discharge is essentially due to the interaction of the plasma medium with air molecules via the following processes in equations ( 6)- (10) given by Falahat et al [35] and Barkhodari et al [36].…”

Section: Plasma Jet Characterizationmentioning

confidence: 99%

“…They found that the intensity of nitrogen emission lines increased when the percentage of argon was higher than nitrogen. Falahat et al [35] examined the optical characteristic of an Ar/O 2 RF plasma jet. Their finding was that increasing the amount of Ar in the mixture leads to higher emission intensities of O and also N 2 that are resulting from the interaction of plasma with ambient air.…”

Section: Plasma Jet Characterizationmentioning

confidence: 99%

Surface modification of polyethylene using argon and argon/methane DBD atmospheric pressure plasma jet

Bedrouni,

Ouchabane,

Almabouada

et al. 2023

Phys. Scr.

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This article investigates the surface modification of polyethylene (PE) using an atmospheric pressure plasma jet of the DBD type (APPJ) maintained with pure argon (Ar) and with a premixed gas containing 90% argon and 10 % of CH4. First and for both plasma jets, the jet length and the optical emissions coming from the plasma species were studied in terms of flow rate and applied voltage. Comparing to Ar, it has been shown that when the premixed gas is used, the jet length gets smaller, the transition point from laminar to turbulent regime was shifted to a low flow rate, and the emission of CH, H2 and C2 appeared, while O and N2 emission coming from ambient air was quenching. The PE surface treatment in both laminar and turbulent regime has been evaluated using water contact angle (WCA) measurement and attenuated total reflection (ATR). The obtained results showed that the hydrophilicity of PE has been improved in both plasma jets due to oxygen group (C=O) incorporation, but Ar plasma jet was observed to induce surface degradation compared to Ar/CH4 plasma due to the higher excited species.

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Optical characteristics of a RF DBD plasma jet in various $$\hbox {Ar}/\hbox {O}_{2}$$ Ar / O 2 mixtures

Cited by 18 publications

References 32 publications

In Situ Charge Modification within Prussian Blue Analogue Nanocubes by Plasma for Oxygen Evolution Catalysis

In Situ Charge Modification within Prussian Blue Analogue Nanocubes by Plasma for Oxygen Evolution Catalysis

Analysis of Parameters and Identification of Chemical Species Present in Plasma Jets From the Excitation of Helium and Argon for Dental Purposes

Surface modification of polyethylene using argon and argon/methane DBD atmospheric pressure plasma jet

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