Plasma surface treatment of polystyrene in a low power low frequency argon glow discharge

Lau, Y. T.; Chin, O. H.; Lee, Hong Chun; Chiu, Wee Siong; Woo, Hyung‐June

doi:10.1016/j.apsusc.2021.151963

Cited by 12 publications

(7 citation statements)

References 35 publications

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“…Plasma treatment is a process that modifies any surface in a controlled, reproducible, and homogeneous manner. Mostly, it is used for surface cleaning, etching, functional group modification, or cross-linking of organic molecules/polymer chains. − The plasma creates a number of reactive species, notably photons, electrons, ions, radicals, and so forth, and this process initiates secondary reactions as well . Here, Ar–O 2 plasma treatment is used for surface modification of CsPbBr 3 NCs films, as shown schematically in Figure a.…”

Section: Resultsmentioning

confidence: 99%

Plasma-Treated CsPbBr₃ Nanocrystal Films for Anticounterfeiting Applications

Rathod

Das

et al. 2022

ACS Appl. Nano Mater.

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Lead halide perovskite (LHP) nanocrystals (NCs) are considered propitious materials due to their extraordinary optoelectronic properties. Their poor ambient stability hinders their practical applications. Among the several approaches taken to enhance the ambient stability, plasma treatment is considered one of the best approaches because it does not hinder charge transport or reduce relative NC content while allowing easy and scalable processing. The plasma treatment increases the overall ambient stability of LHPs but at the cost of photoluminescence quantum yield (PLQY). We found that a short duration of the plasma treatment enhances the PL intensity by 30%, along with enhanced moisture stability. However, longer duration of plasma treatment decreases the photoluminescence (PL), and the NCs become hydrophilic. In this work, we report the underlying chemistry of stability enhancement during plasma treatment and how it affects the PL intensity. We performed Ar−O 2 plasma treatment on the CsPbBr 3 NCs thin films, which induces the cross-linking of the passivating ligand oleylamine that creates a stronger network of ligands, providing better encapsulation and higher PL intensity. A longer duration of plasma treatment results in oxidation of the passivating ligands in the presence of oxygen that eventually degrades the NCs. We created double-layer fluorescent security tags using the PL-stabilized NCs and as-synthesized NCs, having the same emission profile. The security pattern was created using the stabilized perovskite and masked with the assynthesized perovskite, which is relatively unstable and can be washed off under certain treatments.

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Section: Resultsmentioning

confidence: 99%

Plasma-Treated CsPbBr₃ Nanocrystal Films for Anticounterfeiting Applications

Rathod

Das

et al. 2022

ACS Appl. Nano Mater.

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“…[9] According to the literature, Ar plasma etching is relatively uniform. [73][74][75] Changing the type of combined gas with argon can also change the surface's hydrophobic/hydrophilic properties. For example, adding N 2 to a hydrophobic surface modified by Ar/HMDS plasma can cause it to become super hydrophobic, whereas adding O 2 causes it to become super-hydrophilic, [38] as demonstrated in Figure 10B.…”

Section: Gas Typementioning

confidence: 99%

Interfacial properties of multicomponent plasma‐modified high‐performance fiber‐reinforced composites: A review

et al. 2022

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This study reveals the interfacial properties of multicomponent plasma with four aspects, including cleaning, etching, functionalization, and polymerization. Particles formed by plasma ionization collide to form volatile groups, which can interact with the surface to form volatile substances that clean the surface. The multicomponent plasma etching effect on the surface is significant, and O 2 and N 2 may interact to improve oxidation capacity. Inert gas argon (Ar) can be combined with reactive gases O 2 , N 2 , and NH 3 to introduce hydroxyl and amine groups and other active groups to change the surface's chemical structure. When a multicomponent plasma polymerizes, a film forms on the surface, changing the chemical composition. The cross-linking of gases has a positive effect on the properties of the deposited layer as well. The treatment of various fiber materials, nanoparticles, polymer films, and matrix materials with multicomponent plasma is summarized. The multicomponent plasma significantly improves surface wettability and roughness, and oxygen species aid in the etching of nanomaterials, which improves interface properties. The gas types determine the groups introduced to the surface and the surface attachment site.

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“…Figure 1 shows the schematic of the setup for plasma treatment of PTFE, which has been described in detail in our previous article [27]. The plasma chamber was made of stainless steel with internal volume of 38.6 l. Two disc-shaped brass electrodes, each of radius 4.5 cm, were placed parallel to each other with a gap separation of 3 cm inside the chamber as shown in figure 1.…”

Section: Hz Glow Discharge Systemmentioning

confidence: 99%

A low power 50 Hz argon plasma for surface modification of polytetrafluoroethylene

Lau¹,

Chiu²,

Lee³

et al. 2022

Plasma Sci. Technol.

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The characteristics of a low power 50 Hz argon plasma for surface treatment of polytetrafluoroethylene (PTFE) film is presented in this article. The current-voltage behavior of the discharge and time-varying intensity of the discharge showed that a DC glow discharge was generated in reversed polarity at every half cycle. At discharge power between 0.5 to 1 W, the measured electron temperature and density were respectively 2-3 eV and ~10^8 cm^-3. The optical emission spectrum of the argon plasma showed presence of some ‘impurity species’ such as OH, N2 and H, which presumably originated from the residual air in the discharge chamber. On exposure of PTFE films to the argon glow plasma at pressure 120 Pa and discharge power 0.5 to 1 W, the water contact angle reduced by 4% to 20% from the original 114° at pristine condition, which confirms improvement of its surface wettability. The increase in wettability was attributed to incorporation of oxygen-containing functional groups on the treated surface and concomitant reduction in fluorine as revealed by the XPS analysis and increase in surface roughness analyzed from the Atomic Force micrographs. Ageing upon storage in ambient air showed retention of the induced increase in surface wettability.

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Plasma surface treatment of polystyrene in a low power low frequency argon glow discharge

Cited by 12 publications

References 35 publications

Plasma-Treated CsPbBr₃ Nanocrystal Films for Anticounterfeiting Applications

Plasma-Treated CsPbBr₃ Nanocrystal Films for Anticounterfeiting Applications

Interfacial properties of multicomponent plasma‐modified high‐performance fiber‐reinforced composites: A review

A low power 50 Hz argon plasma for surface modification of polytetrafluoroethylene

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Plasma surface treatment of polystyrene in a low power low frequency argon glow discharge

Cited by 12 publications

References 35 publications

Plasma-Treated CsPbBr3 Nanocrystal Films for Anticounterfeiting Applications

Plasma-Treated CsPbBr3 Nanocrystal Films for Anticounterfeiting Applications

Interfacial properties of multicomponent plasma‐modified high‐performance fiber‐reinforced composites: A review

A low power 50 Hz argon plasma for surface modification of polytetrafluoroethylene

Contact Info

Product

Resources

About

Plasma-Treated CsPbBr₃ Nanocrystal Films for Anticounterfeiting Applications

Plasma-Treated CsPbBr₃ Nanocrystal Films for Anticounterfeiting Applications