• Journal of the Microelectronics and Packaging Society
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• v.22 no.4
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• pp.83-89
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• 2015

In this paper, we propose a fabrication technique for enhanced electrical properties of piezoelectric thick films with excellent patterning property using sol-infiltration and a direct-patterning process. To achieve the needs of high-density and direct-patterning at a low sintering temperature (< $850^{\circ}C$), a photosensitive lead zirconate titanate (PZT) solution was infiltrated into a screen-printed thick film. The direct-patterned PZT films were clearly formed on a locally screen-printed thick film, using a photomask and UV light. Because UV light is scattered in the screen-printed thick film of a porous powder-based structure, there are needs to optimize the photosensitive PZT sol infiltration process for obtaining the enhanced properties of PZT thick film. By optimizing the concentration of the photosensitive PZT sol, UV irradiation time, and solvent developing time, the hybrid films prepared with 0.35 M of PZT sol, 4 min of UV irradiation and 15 sec solvent developing time, showed a very dense with a large grain size at a low sintering temperature of $800^{\circ}C$. It also illustrated enhanced electrical properties (remnant polarization, $P_r$, and coercive field, $E_c$). The $P_r$ value was over four times higher than those of the screen-printed films. These films integrated on silicon wafer substrate could give a potential of applications in micro-sensors and -actuators.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.6
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• pp.1385-1391
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• 2012

The authenticity of a document is recognized only when sealing on the document can be recognized to be the same as the original seal of a person who drew up the document. But forge in various ways is prevalent; forge through stamp-copy, forge through photocopying, forge through computer seal sculpture machine, forge through photosensitive resin, etc. Among the methods above, a method of making a forged seal with photosensitive resin panels, which is one of the easiest forging methods, enables making a forged seal the same as the original seal through the work of projecting ultraviolet rays on a resin panel on which negative film is stuck after making it using the original seal. But as research into this reality has not been sufficiently carried on, it is difficult to identify forged sealing through photosensitive resin seals, indeed. For this reason, unless regulations about making forged seals using resin machine for print are enforced, crimes related to forged seals using photosensitive resin are expected to increase in the future. Thus, after stamping 10 resin seals made based on an original seal carved of thick and thin strokes of characters, this paper intends to clarify that there are differences between original sealing and forged sealing through sealing identification method. Consequently, we verified the significant difference in the statistics between original sealing and forged sealing.

• Journal of the Korean Graphic Arts Communication Society
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• v.12 no.1
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• pp.107-131
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• 1994

• Proceedings of the Korean Society of Potoscience Conference
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• spring
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• pp.41-41
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• 1996

• Proceedings of the Korean Society of Potoscience Conference
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• 2006.06a
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• pp.38-38
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• 2006

• Proceedings of the Korean Society of Potoscience Conference
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• spring
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• pp.21-21
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• 2003

• Bulletin of the Korean Chemical Society
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• v.16 no.1
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• pp.7-9
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• 1995

• Bulletin of the Korean Chemical Society
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• v.18 no.2
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• pp.243-245
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• 1997

• Journal of the Microelectronics and Packaging Society
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• v.7 no.2
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• pp.43-46
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• 2000

Nd:YAG laser of 355 nm wavelength, which amounts to 3.5 eV, produced by a harmonic generator was used to create Ag metallic particles as seeds for nucleation in photosensitive glass containing $Ag^+$ and $Ce^{3+}$ . The pulse widths and frequency of the laser were 8ns and 10 Hz, respectively. For crystalline growth, heat-treatment following laser irradiation was carried out at $570^{\circ}C$ for 1h. Then, the $LiAlSi_3O^8$ crystal phase appeared in the laser irradiated lithium aluminum silicate glass. We present the effect of laser-induced nucleation compared with spontaneous nucleation by heat treatment fur crystallization in the glass.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.1
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• pp.139-141
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• 2007

Thin films of polyimide (Pl) were fabricated by a vapor deposition polymerization method (VDPM) and studied for the photosensitive characteristic. Polyamic acid (PAA) thin films fabricated by vapor deposition polymerization (VDP) from 6FDA and 4-4' DDE were converted to PI thin films by thermal curing. From AFM and Ellipsometer experimental, the films thickness was decreased and the reflectance was increased as the curing temperature was increased. Those results implies that thin film is uniform. From UV-Vis spectra, PI thin films showed high absorbance in 225 $\sim$ 260 [nm] region.