Sol-Gel 법을 이용한 칼슘-알루미네이트계 전자화물 박막의 제조와 특성 = Fabrication and properties of Calcium-aluminate electride thin films using by sol-gel process

국문 초록 (Abstract)

Sol-gel법을 적용하여 $12CaO{\cdot}7Al_2O_3$(C12A7) 전자화물 박막을 제조하기 위해 CaO-$Al_2O_3$ sol을 제조하여 dip 코팅법을 적용하여 quartz 기판에 박막을 형성하였으며 열처리를 통해 C12A7의 박막을 제조하였다. C12A7 상의 형성 $800^{\circ}C$에서 시작되었고 $1,200^{\circ}C$ 온도에서 1시간 열처리를 통해 치밀화된 박막을 제조할 수 있었다. 제조된 C12A7 박막은 부도체였지만 수소 환원 분위기 열처리를 통해 전기전도도를 나타내기 시작했으며 $1,200^{\circ}C$ 48시간 열처리 시 120 S/cm의 전기전도도를 나타내었다.

다국어 초록 (Multilingual Abstract)

The Calcium-aluminate electride thin films on the quartz substrates was coated by sol-gel process. The crystallization of the C12A7 thin film was observed at $800^{\circ}C$ and high density C12A7 thin film was achieved on heat treatment at $1,200^{\circ}C$ for 1 hour. The reduction heat treatment of C12A7 thin film could be converted from insulator to conductor and the electrical conductivity was 120 S/cm in the C12A7 thin film heat treated at $1,200^{\circ}C$ with $H_2$ gas for 48 hours.

참고문헌 (Reference)

1 H. Bartl, "Zur struktur des 12CaO · 7Al2O3" 12 : 547-, 1970

2 W. Brockner, "Thermal decomposition of nickel nitrate hexahydrate, Ni(NO3)2 · 6H2O, in comparison to Co(NO3)2 · 6H2O and Ca(NO3)2 · 4H2O" 456 : 64-, 2007

3 R.W. Nurse, "The 12CaO · 7Al2O3 phase in the CaO-Al2O3 system" 64 : 323-, 1965

4 H.S. Potdar, "Synthesis of nano-sized porous γ-alumina powder via a precipitation/digestion route" 321 : 109-, 2007

5 L. Shi, "Preparation and characterization of alumina membranes and alumina-titania composite membranes" 14 : 3599-, 1999

6 Y.M. Sung, "Phase transformation of calcia-alumina-magnesia fibres produced by inviscid melt spinning" 31 : 4741-, 1996

7 S. Rajesh Kumar, "Phase transformation in sol-gel titania containing silica" 38 : 161-, 1999

8 R. Thomas, "Perovskite crystallization of sol-gel processed (Pb,La0.06,Gd0.02)(Zr0.65,Ti0.35)O3 thin films; Dielectric, ferroelectric and optical properties" 17 : 2652-, 2002

9 H. Hosono, "Occurrence of superoxide radical ion in crystalline 12CaO · 7Al2O3 prepared via solidstate reactions" 26 : 1192-, 1987

10 J.E. Medvedeva, "Hopping versus bulk conductivity in transparent oxides; 12CaO · 7Al2O3" 85 : 955-, 2004

11 S. Matsuishi, "Highdensity electron anions in a nanoporous single crystal; [Ca24Al28O64]4+(4e-)" 301 : 626-, 2003

12 M. Miyakawa, "High electron doping to a wide band gap semiconductor 12CaO · 7Al2O3 thin film" 90 : 182105-, 2007

13 H. Hosono, "Functioning of traditional ceramics 12CaO · 7Al2O3 utilizing built-in nano-porous structure" 5 : 409-, 2004

14 M. Miyakawa, "Formation of inorganic electride thin films via site-selective extrusion by energetic inert gas ions" 97 : 023510-, 2005

15 S.W. Kim, "Fabrication of room temperature-stable 12CaO · 7Al2O3 electride: a review" 18 : S5-S14, 2007

16 J.L. Dye, "Electrons as anions" 301 : 607-, 2003

17 K. Hayashi, "Electronic insulator-conductor conversion in hydride ion-doped 12CaO · 7Al2O3 by electron-beam irradiation" 86 : 22109-, 2005

18 M. Mazloumi, "Alumina nanopowder production from synthetic Bayer liquor" 89 : 3654-, 2004