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Hot-filament 화학기상 증착법에 의한 탄소나노튜브의 성장 및 표면 특성
최은창,김정태,박용섭,최원석,홍병유,Choi, Eun-Chang,Kim, Jung-Tae,Park, Yong-Seob,Choi, Won-Seok,Hong, Byung-You 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.3
본 연구에서는 실리콘 웨이퍼 위에 마그네트론 스퍼터링 시스템을 이용하여 Ni 촉매 층을 증착시키고, $NH_3$와 $C_2H_2$ gas를 이용하여 탄소나노튜브를 성장시켰다. Hot-filament 플라즈마 화학기상 증착법으로 탄소나노튜브의 성장 온도는 350, 450, 550, $650^{\circ}C$로 변화시켰으며, 성장되어진 탄소나노튜브는 field emission scanning electron microscope(FESEM) 분석을 하여 관찰하였고, 접촉각 측정법을 이용하여 탄소나노튜브 층의 특성을 분석하였다. 결과적으로 성장 온도는 탄소나노튜브의 성장 특성을 변화시키는 중요한 요소이다. In this paper, the catalyst layer is deposited on silicon substrate using magnetron sputtering system and carbon nanotubes(CNTs) were grown in $NH_3\;and\; C_2H_2$ gas by hot-filament plasma enhanced chemical vapor deposition (HFPECVD) system. A growth temperature of carbon nanotubes was changed from $350^{\circ}C\;to\;650^{\circ}C\;by\;100^{\circ}C$. We observed the shape of CNTs by a field-emission scanning electron microscope(FE-SEM) measurement and analyzed the surface characteristic of CNTs layer by contact angle measurement. That is, the growth temperature of CNTs is the important factor leads to the variation of the properties.
최은창,Choi, Eun Chang The Korean Society for Head and Neck Oncology 2014 대한두경부 종양학회지 Vol.30 No.1
유리피판을 이용한 두경부 재건후 폐색전은 드물게 발생한다. 수술후 예상하기 힘들고 갑작스럽게 발생하기 때문에 환자가 아주 위험한 상황에 빠질 수 있다. 즉각적인 발견과 적절한 치료만이 환자의 생명을 구할 수 있다. 유리피판을 이용한 두경부 재건후 발생한 폐색전증 2예를 문헌고찰과 함께 보고하는 바이다.
바이오센서로의 응용을 위한 수직 배열된 탄소나노튜브의 식각처리
최은창,박용섭,최원석,홍병유,Choi, Eun-Chang,Park, Yong-Seob,Choi, Won-Seok,Hong, Byung-You 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.7
The metal catalyst particles which there is as impurities on a tip part of carbon nanotube (CNT) are not good to apply it to a nano-electronic device. It was very important the opening of CNT-tip to fix a target bio material and a material to accept in CNT in a biosensor, so we performed $HNO_3$ wet etching to remove the metal catalyst particle which there was on a tip part of CNT grown up in the study and observed the opened CNT-tip with etching time. We synthesized the CNTs using a HF-PECVD method and choses the CNT length of 700 nm for the application of nano-electronic device such as a biosensor etc.. We observed the opened CNT-tip with wet etching times of $HNO_3$ (10, 30, 60 min). From the results, we observed that the CNT-tip was opened with the increase of wet etching time lively. In case of CNTs etched during 60 min, we confirmed that there was not the ratio of Ni included in CNTsI as catalyst. Conclusively, in the case of CNT etched for 60 minutes, it is completely good for application of a biosensor and, in addition, the metal-free CNTs will contribute to the application of other nanoelectronic devices.
플라즈마 밀도와 기판의 기울임 정도에 따른 탄소나노튜브의 성장
최은창,김경욱,홍병유,Choi, Eun-Chang,Kim, Kyung-Uk,Hong, Byung-You 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7
We need to control the growth orientation of CNTs on a substrate for applications to various electric devices. Generally, the flow direction of feed gases and electric field between two electrode affect to growth orientations of CNTs. In this paper, we varied tilt degrees $(0^{\circ},\;20^{\circ},\;35^{\circ},\;50^{\circ},\;65^{\circ},\;90^{\circ})$ of substrates on a cathode and DC bias voltages (0, 500, 700 V) applied between two electrodes in order to change growth orientations of CNTs. We confirmed that tilt degrees of the substrate and variation of DC bias voltages affected to the shape and orientation of the grown CNTs on the substrate.
최은창(Eun Chang Choi),고윤우(Yoon Woo Koh),김철호(Chui Ho Kim),김동영(Dong Young Kim) 대한두경부종양학회 2001 대한두경부 종양학회지 Vol.17 No.1
It is well established that cervical lymph node metastasis is the base of clinical study on head and neck cancer. But few studies have been reported on lymph node metastasis of head and neck cancer in Korea. We consider it essential that studies on cervical lymph node metastases are conducted on pathologically proven database. Therefore, We must have database and consitent system for documentation and data collection of neck dissection specimen for prospective and retrospective study. Herein, We suggest several points from our experiences performing the proper data collection and documentation of neck dissection specimen.
최은창(Eun Chang Choi),김광문(Kwang Moon Kim),흥원표(Won Pyo Hong) 대한두경부종양학회 1990 대한두경부 종양학회지 Vol.6 No.2
Most common laryngeal cancer is squamous cell carcinoma, but various kinds of non-squamous cell tumor also occurs in the larynx. It is quite different from epidermoid carcinoma in the aspect of invasive behavior, metastatic route and treatment modality. Its proper diagnosis is somewhat difficult due to its rarity. This paper presents clinical feature of eight non-squamous cell tumor of the larynx experienced during the past 15 years.
안면신경을 보존하며 이하선과 경부청소술 시료를 일괴로 절제하는 방법
최은창(Eun Chang Choi),고윤우(Yoon Woo Koh),최재진(Jae Jin Choi),정상호(Sang Ho Chung),홍현준(Hyun Jun Hong),문인석(In Suk Moon) 대한두경부종양학회 2000 대한두경부 종양학회지 Vol.16 No.2
Parotidectomy, combined with neck dissection, is not rare situation in case of parotid malignancy. It is common to accomplish the parotidectomy and neck dissection separately. But there are numerous lymph nodes surrounding the marginal mandibular branch of facial nerve and facial artery and vein. And so, Mono-bloc dissection of the parotid gland and neck specimen is neccessary to completely resect these lymph nodes with preserving the marginal mandibular branch of facial nerve. We are reporting three cases of mono-bloc dissection of the parotid gland and neck specimen.
최은창(Eun Chang Choi),김동영(Dong Young Kim),고윤우(Yoon Woo Koh),홍정표(Jung Pyoe Hong),이세영(Sei Young Lee),홍원표(Won Pyo Hong) 대한두경부종양학회 1999 대한두경부 종양학회지 Vol.15 No.1
Background and Objectives: Occult neck metastasis rate of laryngeal and hypopharyngeal cancer varies widely depending upon authors. Materials and Methods: Sixty four cases, previously untreated, of N0 laryngeal and hypopharyngeal squamous cell carcinoma patients who underwent surgery as an initial treatment from 1992 to 1997 were evaluated. All had unilateral or bilateral elective neck dissection at the time of surgery for the primary. Occult neck metastasis rate was evaluated with pathologic examination of neck dissection specimen. Results: Occult neck metastasis rate by primary site was as follows. Supraglottis ipsilateral 32%(8/25) contralateral 15%(3/20), glottis ipsilateral 17%(5/30), contralateral 0%(0/22), hypopharynx ipsilateral 78%(7/9), contralateral 25%(2/8). Conclusion: Supraglottic and hypopharyngeal cancer may need elective neck treatment bilaterally. Occult neck metastasis of glottic cancer to opposite site was minimal.