https://scholar.dgist.ac.kr/handle/20.500.11750/342 2026-04-04T15:50:46Z https://scholar.dgist.ac.kr/handle/20.500.11750/56817 Title: STRONG DISCHARGE PROCESSES BY ATMOSPHERIC PLASMA JET A AY WITHOUT EXTERNAL GROUND ELECTRODE Author(s): Kim, Jae Young; Lee, Sun Young; Shin, Mi Hyang; Moon, Dae Won; Tae, Heung-Sik Abstract: We previously reported an intense plasma emission formed by plasma jet-to-jet coupling from various circular array configurations at atmospheric pressure 1,2 . To achieve an intense plasma emission using plasma jet-to-jet coupling, the plasma array device required a single electrode configuration and external ground electrode located several centimeters apart from the array 1 . In spite of an intense plasma plume with a lot of reactive radicals in ambient air, the requirement of precise adjustment of the discharge distance between the plasma array and the counter electrode would be a drawback of the plasma jet array for various surface treatments at atmospheric pressure. To generate an intense plasma plume with a good stability regardless of the discharge distance, we now propose two different plasma array structures to eliminate a counter ground electrode.The first plasma array device consists of a central glass tube encircled by an array of hollow glass tubes with side openings. The device configuration forces the individual plasma jets emanating from the side openings of the outer tubes to merge with the central plasma plume. As a result, a high intensity plasma emission is stably produced from the plasma jet-to-jet coupling of the ten glass tubes regardless of the distance between the plasma array and the external ground electrode, thereby eliminating the need for an external ground electrode. The second proposed plasma array structure consisting of two plasma jet arrays with an appropriate angle and a double electrode configuration is used as an ambient plasma source. Since these proposed plasma devices are able to generate an intense plasma emission without external ground electrode, they are promising tools for surface treatments and modifications that require a strong discharge process such as an ambient ionization mass spectrometry, regardless of the dielectric property of the target material. 2015-05-23T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/47276 Title: 대기압 질량분석 이미징 기술을 위한 나노입자를 이용한 레이저 탈착 성능 향상 Author(s): 김재영; 서은석; 문대원 2017-02-14T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/47007 Title: Investigation of liquid interface structure with ion beam analysis Author(s): Lim, Hee-Jin; Jung, Kang-Won; Moon, Daewon Abstract: The presence of electric double layer (EDL) at liquid interface has been recognized for last 100 years but the atomic scale structure of EDL has not been revealed, even though optical or electrical techniques could monitor the change of EDL. We designed an ultra high vacuum compatible liquid cell with a single layer graphene window so that MEIS analysis can be applied to the graphene liquid interface. We clearly observed the EDL structure formed between CuO and KI solution showing I accumulation and K depletion at the EDL with the width of ∼1 nm. Complementary TOF-SIMS analysis results will be also reported. Studies on systematic dependence of EDL structure on the bias voltage and electrolyte concentration are in progress. Preliminary results on EDL structure profiling with TOF-MEIS and further prospective on bioliquid interface, protein adsorption, and artificial cell membrane structure will be reported for discussions and comments 2017-12-06T15:00:00Z