CAJ | 학술논문

采用高分子辅助沉积法制备了Si基LaBaCo2O5+δ( LBCO)薄膜，主要研究了Si基LBCO薄膜的电输运性质及氧敏性质。通过对LBCO薄膜的电输运性质研究，发现LaBaCo2O5+δ薄膜的激活能Ea为0.32 eV，远小于同类体材料PrBaCo2O5+δ激活能(Ea=0.67 eV)，说明将材料薄膜化以后，有利于降低材料的激活能；此外，LBCO薄膜阻-温曲线满足小极化子热激化跳跃理论，证明该材料的导电机制是小极化子电子电导。氧敏性质研究发现，在较低的温度356℃下，当测试气体从氢气切换到氧气时，薄膜电阻从3×105Ω迅速下降到4.5×102Ω(ΔR≈3.0×105Ω)，响应时间为4.2 s，说明在较低温度下，LBCO薄膜对氧气具有较高的敏感度。同时，发现LBCO薄膜材料导电能力并不与氧气的浓度成正比。
채용고분자보조침적법제비료Si기LaBaCo2O5+δ( LBCO)박막，주요연구료Si기LBCO박막적전수운성질급양민성질。통과대LBCO박막적전수운성질연구，발현LaBaCo2O5+δ박막적격활능Ea위0.32 eV，원소우동류체재료PrBaCo2O5+δ격활능(Ea=0.67 eV)，설명장재료박막화이후，유리우강저재료적격활능；차외，LBCO박막조-온곡선만족소겁화자열격화도약이론，증명해재료적도전궤제시소겁화자전자전도。양민성질연구발현，재교저적온도356℃하，당측시기체종경기절환도양기시，박막전조종3×105Ω신속하강도4.5×102Ω(ΔR≈3.0×105Ω)，향응시간위4.2 s，설명재교저온도하，LBCO박막대양기구유교고적민감도。동시，발현LBCO박막재료도전능력병불여양기적농도성정비。
The LaBaCo2O5+δ (LBCO) thin films were deposited on Si(001) substrates by the polymer-assisted deposition technique. The electrical transport properties and oxygen sensitive properties of LBCO thin films on Si substrate were studied. It is found that the activation energy (Ea=0.32 eV) of LBCO films is far less than that of the similar bulk material of PrBaCo2O5+δ(Ea=0.67 eV), which confirmed that preparing thin film is helpful to reduce the active energy of this material. The resistivity-temperature curve of the films demonstrates that the conductive mechanism of LBCO films is small polaron electronic conductivity. The drastic changes of films resistance (from 3×105Ω to 4.5×102Ω) with the switch of redox (O2-H2) environment within such a short time (4.2 s), at such a low temperature 356℃, indicates that LBCO films possess an excellent oxygen sensitive property. Simultaneously, the electrical conductivity of LBCO thin film is not proportional to the concentration of oxygen.