Laser Radiation-Induced, Residue-Free, Localized Decomposition of Some Plastics

Parts, L.; Hardy, Edgar E.; Rodenburg, Margaret L.

doi:10.1021/i360033a003

Cited by 9 publications

(5 citation statements)

References 9 publications

(17 reference statements)

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“…To test the influence of polymer residues on the degradation rate of GaTe, flakes were transferred to monolayer graphene surfaces with high and low levels of PMMA residue (Supporting Information, S4). We observed that higher residue levels led to increased degradation in GaTe, possibly due to further decomposition of residues into oxygen-containing products. , …”

Section: Resultsmentioning

confidence: 71%

“…We observed that higher residue levels led to increased degradation in GaTe, possibly due to further decomposition of residues into oxygen-containing products. 47,48…”

Section: Resultsmentioning

confidence: 99%

“…We observed that higher residue levels led to increased degradation in GaTe, possibly due to further decomposition of residues into oxygen-containing products. 47,48 Degradation in GaTe is thought to proceed by intercalation of molecular oxygen between layers in the presence of moist air. 26 Because the top interface is identical for all samples (GaTe/air), there must be some feature of the SiO 2 /Si and Al substrates that encourages this process compared with graphene substrates.…”

Section: Acs Omegamentioning

confidence: 99%

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Passivation of Layered Gallium Telluride by Double Encapsulation with Graphene

et al. 2019

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Layered semiconductor gallium telluride (GaTe) undergoes a rapid structural transition to a degraded phase in ambient conditions, limiting its utility in devices such as optical switches. In this work, we demonstrate that the degradation process in GaTe flakes can be slowed down dramatically via encapsulation with graphene. Through examining Raman signatures of degradation, we show that the choice of substrate significantly impacts the degradation rate and that the process is accelerated by the transfer of GaTe to hydrophilic substrates such as SiO2/Si. We find that double encapsulation with both top and bottom graphene layers can extend the lifetime of the material for several weeks. The photoresponse of flakes encapsulated in this way is only reduced by 17.6 ± 0.4% after 2 weeks, whereas unencapsulated flakes display no response after this time. Our results demonstrate the potential for alternative, van der Waals material-based passivation strategies in unstable layered materials and highlight the need for careful selection of substrates for 2D electronic devices.

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Section: Resultsmentioning

confidence: 71%

“…We observed that higher residue levels led to increased degradation in GaTe, possibly due to further decomposition of residues into oxygen-containing products. 47,48…”

Section: Resultsmentioning

confidence: 99%

Section: Acs Omegamentioning

confidence: 99%

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Passivation of Layered Gallium Telluride by Double Encapsulation with Graphene

et al. 2019

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“…0.7 cm, length 1.5 cm) sealed to the cell body was positioned in the middle of the cell along its symmetry axis. A tunable continuous-wave (cw) C 0 2 laser' operated at the P(20) line of the O F 1 4 10"O transition was used for the irradiation of a compact polymer sample melt beforehand and housed in the tube. The laser beam (10 W output) was mildly focused by a germanium (Ge) lens (focal length 10cm) to obtain an incident energy density of -30 W cni-'.…”

Section: Methodsmentioning

confidence: 99%

Laser evaporation of some solid organosilicon polymers

Pola

Vítek

Polyakov

et al. 1991

Applied Organom Chemis

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Continuous wave (cw) C 0 2 laser irradiation of some organosilicon polymers composed of -Me,Si-, -Me2SiMe,SiCH,-, RMeSi-and RMeSiMe,SiCH,CH,-units (where R =methyl, adamantyl, phenyl and hydrogen) leads to the evaporation of the polymer and is dominated by the formation of a solid deposit that has a continuous structure. It is assumed that chemical changes occur prior to the transfer of ejected material to the gas phase and that these consist mainly of the formation of high molecular biradicals or 1,t-disilacyclobutane monomer that both re-polymerize spontaneously upon their deposition onto a nearby cold surface. The mechanism of these specific decompositions of the polymers is assessed on the basis of the IR spectra of the deposits and, for the minor gaseous products, identification by GC MS techniques.

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“…At temperatures above 160 o C acceleration of scission (an auto-oxidative reaction) by the generated degradation products has been reported [21]. On exposure to laser irradiation of sufficient power, POM is known to degrade in a manner consistent with its thermal degradation [22], with marking achieved if the contrast of acceptable quality is achieved in the irradiated area. In this work, the results and insights from attempts at laser marking three types of POM (transparent (uncoloured POM), white POM, and black coloured POM) using a wide range of laser marking parameters are presented, and differences in their respective laser markability are highlighted.…”

Section: Introductionmentioning

confidence: 99%

Laser Marking of Engineering Thermoplastics: The Polyoxymethylene (POM) Case Study

Ofoegbu,

Rosa,

Fernandes

et al. 2023

KEM

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Polyoxymethylene (POM) is a semi-crystalline engineering thermoplastic polymer employed in the manufacturing of precision parts for engineering applications requiring high dimensional stability and good frictional resistance properties. Due to its lower cost and ease of integration into automated manufacturing processes, laser marking is the state of art method vastly employed for marking products aiming to enhance traceability and accountability. Laser marking of polymers can be challenging depending on the outcome of interactions between the material and the laser radiation for a specific wavelength. Low absorption for a wide wavelength range is usual on transparent and white thermoplastics, which is also the case for natural POM. In this work, in a bid to determine the range of feasible process parameters that ensure good-quality markings, which are necessary to developing a lean manufacturing-focused laser marking process, both natural and pigmented POM were laser-marked, and the quality of the substrates and markings were analyzed using a variety of analytical methods. Results indicated a marked difference in the laser mark-ability of natural and pigmented POM, which is attributed to marked differences in laser absorption abilities of natural and pigmented POM.

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Laser Radiation-Induced, Residue-Free, Localized Decomposition of Some Plastics

Cited by 9 publications

References 9 publications

Passivation of Layered Gallium Telluride by Double Encapsulation with Graphene

Passivation of Layered Gallium Telluride by Double Encapsulation with Graphene

Laser evaporation of some solid organosilicon polymers

Laser Marking of Engineering Thermoplastics: The Polyoxymethylene (POM) Case Study

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