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RF PACVD에 의한 초경합금상에 다이아몬드 박막의 합성
김대일,이상희,박구범,박상현,이용근,김보열,김영봉,이덕출,Kim, Dae-Il,Lee, Sang-Hee,Park, Gu-Bum,Park, Sang-Hyun,Lee, Yong-Geun,Kim, Bo-Youl,Kim, Young-Bong,Lee, Duck-Chool 대한전기학회 2000 전기학회논문지C Vol.55 No.12
Diamond thin films were synthesized on WC-Co substrate at various experimental parameters using 13.56MHz RF PACVD)radio frequency plasma-assisted chemical vapor deposition). In order to increased the nucleation density, the WC-Co substrate was polished with 3${\mu}m$ diamond paste. And the WC-Co substrate was preatreated in $HNO_3\;:\;H_2O$ = 1:1 and $O_2$ plasma. In $H_2-CH_4$ gas mixture, the crystallinity of thin film increased with decreasing $CH_4$ concentration at 800W discharge power and 20torr reaction pressure. In $H_2-CH_4-O_2$ gas mixture, the crystallinity of thin film increased with increasing $O_2$ concentration at 800W discharge power, 200torr reaction pressure and 4% $CH_4$ concentration.
유도현(Do-Hyun You),박구범(Gu-Bum Park) 대한전기학회 2019 전기학회논문지 Vol.68 No.12
This study proposes the optimum printing conditions for 3D printing to the thickness set by the slice program using FDM-type 3D printer. It can be seen that both the PLA and the ABS filaments have a flow rate of 110% which is closest to the set layer height of 0.2mm. For PLA cubes, the flow rate closest to the volume of 1000mm³ when the horizontal×length×height is set to 10mm each is 90%, and the flow rate closest to the volume of 8000mm³ when the horizontal×length×height is set to 20mm each is 90%. For ABS cubes, the flow rate closest to the volume of 1000mm³ when the horizontal×length×height is set at 10mm each is 80% and the flow rate closest to the volume of 8000mm³ when the horizontal×length×height is set at 20mm each is 80%. From the results of additive microstructure between layers of the PLA cube, the average thickness of a layer is approximately 185μm(=0.185mm) when width×length×height is set at 10mm and 20mm respectively. The end parts of the layer of the PLA cube are regularly rounded. The average thickness of a layer of the ABS cube is the same as that of the PLA cube. The end parts of the layer of the ABS cube are thickly rounded, and the other is thinly rounded.
산소 플라즈마 처리한 탄소나노튜브의 표면상태와 전계방출 특성
이선우(Sunwoo Lee),이붕주(Boong-Joo Lee),박구범(Gu-Bum Park),신백균(Paik-Kyun Shin) 대한전기학회 2013 전기학회논문지 Vol.62 No.3
Multi-walled carbon nanotubes (MWCNTs) were synthesized using catalytic chemical vapor deposition (CVD) method. Oxygen plasma treatment was applied to modify surface state of the CNTs synthesized for improvement of field emission performance. Surface state of the plasma treated CNTs was studied by X-ray photoelectron spectroscopy (XPS). The surface states of the CNTs were changed as a function of plasma treatment time. The oxygen related carbon shift was moved toward higher binding energy with the plasma treatment time. This result implies that the oxygen plasma treatment changes the surface state effectively. While any shift in carbon 1s peak was not detected for the as grown CNTs, oxygen related carbon shift was detected for the plasma treated CNTs. Carbon shift implies that closed CNT tips were opened by the oxygen plasma and reacted with oxygen species. Since the field emission occurs at pentagons or dangling bonds of the CNT tips, the increase of carbon-oxygen bonds plays an important role in field emission behavior by increasing the number of electron emission sites resulting in improvement of the field emission performance.