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A Comparative Study of Laser-Induced Graphene by CO₂ Infrared Laser and 355 nm Ultraviolet (UV) Laser.

ABSTRACT: Laser-induced graphene (LIG) is an emerging technique for producing few-layer graphene or graphene-like material that has recently received increasing attention, due to its unique advantages. Subsequently, a variety of lasers and materials have been used to fabricate LIG using this technique. However, there is a lack of understanding of how different lasers (wavelengths) perform differently in the LIG conversion process. In this study, the produced LIG on polyimide (PI) under a locally water-cooled condition using a 10.6 ?m CO₂ infrared laser and a 355 nm ultraviolet (UV) laser are compared. The experimental investigations reveal that under the same UV and CO₂ laser fluence, the ablation of PI show different results. Surface morphologies with micron-sized and nanometer pores were formed by the UV laser under different laser fluences, whereas micron-sized pores and sheet structure with fewer pores were produced by the CO₂ laser. Energy dispersive spectrometry and three-dimensional topography characterization indicate that the photochemical effects were also involved in the LIG conversion with UV laser irradiation. It is also observed through experiments that the photothermal effect contributed to the formation of LIG under both lasers, and the LIG formed on PI substrates by the CO₂ laser showed better quality and fewer layers.

SUBMITTER: Wang L

PROVIDER: S-EPMC7764730 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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A Comparative Study of Laser-Induced Graphene by CO<sub>2</sub> Infrared Laser and 355 nm Ultraviolet (UV) Laser.

Wang Liyong L Wang Zhiwen Z Bakhtiyari Ali Naderi AN Zheng Hongyu H

Micromachines 20201211 12

Laser-induced graphene (LIG) is an emerging technique for producing few-layer graphene or graphene-like material that has recently received increasing attention, due to its unique advantages. Subsequently, a variety of lasers and materials have been used to fabricate LIG using this technique. However, there is a lack of understanding of how different lasers (wavelengths) perform differently in the LIG conversion process. In this study, the produced LIG on polyimide (PI) under a locally water-coo ...[more]

PMID: 33322283

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Project description:The purpose of the study was to assess both anatomic and functional outcomes between short-pulse continuous wavelength and infrared micropulse lasers in the treatment of DME. This was a prospective interventional study from tertiary care eye hospital-King Khaled Eye Specialist Hospital (Riyadh, Saudi Arabia). Patients with center-involving diabetic macular edema were treated with subthreshold laser therapy. Patients in the micropulse group were treated with the 810-nm diode micropulse scanning laser TxCell (IRIDEX Corporation, Mountain View, CA, USA) (subthreshold micropulse-STMP group). Laser was applied according to recommendations for MicroPulse (125 microns spot size, 300 ms pulse duration and power adjustment following barely visible testing burn) in a confluent mode (low intensity/high density) to the entire area of the macular edema. Patients in the short-pulse group were treated with grid pattern laser with 20 ms pulse PASCAL laser 532 nm (TopCon Medical Laser Systems, Tokyo, Japan) with EndPoint algorithm, which was either 30% or 50% of testing burn (EndPoint 30% and EndPoint 50% groups, respectively). Main outcome measures included best-corrected visual acuity (BCVA in logMAR) and foveal thickness at baseline and the last follow-up visit at 6 months. There were 44 eyes in the micropulse group, 54 eyes in the EndPoint 50% group and 18 eyes in the EndPoint 30% group. BCVA for the whole cohort (logMAR) was 0.451 (Snellen equivalent 20/56) at baseline, 0.495 (Snellen equivalent 20/62) (p?=?0.053) at 3 months, and 0.494 (Snellen equivalent 20/62) at the last follow-up (p?=?0.052). Foveal thickness for the whole cohort was 378.2?±?51.7 microns at baseline, 347.2?±?61.3 microns (p?=?0.002) at 3 months, and 346.0?±?24.6 microns at the final follow-up (p?=?0.027). As such the short-pulse system yields more temporary reduction in edema. Comparison of BCVA between baseline and 6 months for EndPoint 30%, EndPoint 50% and STMP groups was p?=?0.88, p?=?0.76 and p?=?0.003, respectively. Comparison of foveal thickness between baseline and 6 months for EndPoint 30%, EndPoint 50% and STMP groups was p?=?0.38, p?=?0.22 and p?=?0.14, respectively. We conclude that the infrared micropulse system seems to improve functional outcomes. When applied according to previously published reports, short-pulse system may yield more temporary reduction in edema while infrared micropulse system may yield slightly better functional outcomes.

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A Comparative Study of Laser-Induced Graphene by CO₂ Infrared Laser and 355 nm Ultraviolet (UV) Laser.

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A Comparative Study of Laser-Induced Graphene by CO<sub>2</sub> Infrared Laser and 355 nm Ultraviolet (UV) Laser.

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A Comparative Study of Laser-Induced Graphene by CO2 Infrared Laser and 355 nm Ultraviolet (UV) Laser.

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A Comparative Study of Laser-Induced Graphene by CO<sub>2</sub> Infrared Laser and 355 nm Ultraviolet (UV) Laser.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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A Comparative Study of Laser-Induced Graphene by CO₂ Infrared Laser and 355 nm Ultraviolet (UV) Laser.