Fundamental study of direct microporous process using laser shock wave

Kang, Moon Suk; Ko, Jong Soo; Lee, Sang Mae; Shin, Bo Sung

doi:10.1007/s00340-015-6097-x

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…It is interesting to note that the substantial absorption inside PP film did not occur when the laser was exposed, since the transmittance of PP film used in this experiment was 99% at 355 nm wavelength. Moreover, the physical and chemical decomposition in PP film could not be developed by the low absorption coefficient [ 53 ]. Instead, the UV laser beam passing through the PP film ( Figure 3 b) induced a series of interactions electrical excitation and thermal effects at GO surface, and the resulting thermal shock was propagated from GO film to the PP film [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

One-Step Laser Patterned Highly Uniform Reduced Graphene Oxide Thin Films for Circuit-Enabled Tattoo and Flexible Humidity Sensor Application

Park

Kim

Lone

et al. 2018

Sensors

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The conversion of graphene oxide (GO) into reduced graphene oxide (rGO) is imperative for the electronic device applications of graphene-based materials. Efficient and cost-effective fabrication of highly uniform GO films and the successive reduction into rGO on a large area is still a cumbersome task through conventional protocols. Improved film casting of GO sheets on a polymeric substrate with quick and green reduction processes has a potential that may establish a path to the practical flexible electronics. Herein, we report a facile deposition process of GO on flexible polymer substrates to create highly uniform thin films over a large area by a flow-enabled self-assembly approach. The self-assembly of GO sheets was successfully performed by dragging the trapped solution of GO in confined geometry, which consisted of an upper stationary blade and a lower moving substrate on a motorized translational stage. The prepared GO thin films could be selectively reduced and facilitated from the simple laser direct writing process for programmable circuit printing with the desired configuration and less sample damage due to the non-contact mode operation without the use of photolithography, toxic chemistry, or high-temperature reduction methods. Furthermore, two different modes of the laser operating system for the reduction of GO films turned out to be valuable for the construction of novel graphene-based high-throughput electrical circuit boards compatible with integrating electronic module chips and flexible humidity sensors.

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Section: Resultsmentioning

confidence: 99%

One-Step Laser Patterned Highly Uniform Reduced Graphene Oxide Thin Films for Circuit-Enabled Tattoo and Flexible Humidity Sensor Application

Park

Kim

Lone

et al. 2018

Sensors

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“…These results might be changed by mixing the polymer with metal. OO has a high transmittance in the UV wavelengths [5,8].…”

Section: Theoreticalmentioning

confidence: 99%

“…However, in order to properly perform the polymer processing using a laser, the wavelength parameters of the laser must be carefully considered [7,9]. For example, because PP absorbs less than 1% of the UV wavelengths in a low-energy beam of UV wavelengths, the processing is less likely to be effective [8][9]. For polymeric materials such as PP, which are difficult to process in the UV wavelengths at low energy, I have determined that the energy absorption of UV wavelengths occurs more easily with a composite mixture of polymer and metal [5 ].…”

Section: Introductionmentioning

confidence: 99%

A Study on a 355nm UV-pulsed Laser Processing of Polypropylene Filled with Copper Micro-particles

Lee¹,

MyungJu²,

Park³

et al. 2019

dtetr

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This study investigated 355nm UV-pulsed laser processing of a 150 thick film of polypropylene filled with copper particles. Generally, processing polypropylene with a low beam energy UV laser is difficult because the material's absorption rate is less than 1% in UV wavelengths. However, polypropylene filled with copper particles is easily processed by UV laser, because copper has a UV absorption rate of more than 70%. The absorbed heat of the copper is transmitted to the polypropylene, accomplishing the machining process. Experimental results were observed while changing the laser processing speed rate. Also, the mechanism of the experimental results was investigated theoretically and experimentally.

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Fundamental study of direct microporous process using laser shock wave

Cited by 2 publications

References 10 publications

One-Step Laser Patterned Highly Uniform Reduced Graphene Oxide Thin Films for Circuit-Enabled Tattoo and Flexible Humidity Sensor Application

One-Step Laser Patterned Highly Uniform Reduced Graphene Oxide Thin Films for Circuit-Enabled Tattoo and Flexible Humidity Sensor Application

A Study on a 355nm UV-pulsed Laser Processing of Polypropylene Filled with Copper Micro-particles

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