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Pd 첨가량 및 첨가방법이 알코올 센서용 SnO₂ 반도체 후막 특성에 미치는 영향 연구
김준형(Jun-Hyung Kim),김형관(Hyeong-Gwan Kim),이호년(Ho-Nyun Lee),김현종(Hyun-Jong Kim),이희철(Hee-Chul Lee) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.5
In this paper, two methods of making the Pd-added SnO₂ (Pd-SnO₂) powder with pure tetragonal phase by the hydrazine method were suggested and compared in terms of crystal structure, surface morphology, and alcohol gas response. One of the addition methods is to use PdCl₂ as a Pd source, the other is to use Pd-based organic with oleylamine (OAM). When Pd concentration was increased from 0 to 5 wt%, the average grain size of Pd-SnO₂ made with Pd-OAM were decreased from 32 to 12 nm. In the case of using with PdCl2, grain size of the PdCl₂ fell to less than 10 nm. However, agglomerated and extruded surface morphology was observed for the films with Pd addition over 4 wt%. The crack-free Pd-SnO₂ thick films were able to successfully fill the 30 μm gap of patterned Pt electrodes by optimized ink dropping method. Also, the 2 wt% Pd-SnO₂ thick film made with PdCl₂ showed gas responses (Rair/Rgas) of 3.7, 5.7 and 9.0 at alcohol concentrations of 10, 50 and 100 ppm, respectively. On the other hand, the prepared 3 wt% Pd-SnO₂ thick film with Pd-OAM exhibited very excellent responses of 3.4, 6.8 and 12.2 at the equivalent measurement conditions, respectively. The 3 wt% Pd-SnO₂ thick film with Pd-OAM has a specific surface area of 31.39 m²/g.
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LCAO기저함수와 슈도포텐셜을 이용한 Sn의 에너지밴드 계산
김형관 漢陽大學校 自然科學硏究所 1996 自然科學論文集 Vol.15 No.-
슈도포텐셜을 이용한 LCAO법으로 금속성 반도체인 Sn 결정의 에너지 밴드를 계산하였다. Hartree-Fock-Slater의 방법으로 원자의 파동함수를 계산한 후 1s∼5d 궤도를 이용하여 Bloch 기저함수를 구성하였다. LCAO법에서 나타나는 다중적분의 계산을 위하여는 이산변분(discrete variational)법을 사용하였고 2152점의 대표점을 선택하였다. 본 계산의 결과는 평면파를 이용한 EPM의 결과와 잘 일치하여 LCAO법에 의한 에너지 밴드 계산도 정확한 결과를 얻을 수 있다는 결론을 얻게 되었다 The energy bands of metallic semiconductor Sn are calculated by the method of LCAO using the pseudopotential. The Bloch bases are constructed by 1s∼5d atomic orbitals calculated by the Hartree-Fock-Slater method. We use the discrete variational method for the calculation of the inevitable multi-center integral in the method of LCAO, and we select 2152 sample points for the calculation. We obtain very good agreement with the plane wave EPM results and conclude that the energy band calculation by the method of LCAO can produce the exact results.
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