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中文摘要：
用静电纺丝法制备了In（NO3）3，聚乙烯吡咯烷酮（PVP）纺丝前驱物，然后分别在500、600、700℃时烧结得到三种In2O3纳米纤维．通过X射线衍射（XRD）仪、热重差热分析（TG／DTA）、场发射扫描式电子显微镜（FE．SEM）表征结果得知，500℃时In2O3的晶相已经形成，且粒径为最小，约为24nm，纳米纤维呈介孔结构．将三种烧结温度的In2O3纤维制作成气敏元件，测试对比了三种元件对甲醛气体的敏感特性，结果表明，500℃烧结得到的In2O3纳米纤维在工作温度为240℃时响应最好，对浓度为10×10^-6（体积分数，妒）甲醛的响应为7．用静电纺丝法合成了CdO纳米颗粒，通过XRD、SEM表征得知CdO呈粒径约为68nm的颗粒．将In2O2和CdO以不同摩尔比（1：1，10：1，20：1）复合，对比测试了纯In2O3及三种In2O3／CdO复合材料对应的气敏元件对甲醛的气敏特性，测试结果表明当In2O3纳米纤维与CdO纳米颗粒以摩尔比10：1复合时，元件的工作温度较低（200℃），且对甲醛表现出最佳的气敏特性，对浓度为10×10^-6甲醛的响应为13．6，响应／恢复时间为140s／32S．最后对不同摩尔比复合的In2O3/CdO对甲醛的气敏机理进行了初步分析．
英文摘要：
In（NO3）Jpolyvinyl pyrrolidone （PVP） nanofiber precursors were synthesized using a traditional electrospinning method, and were then annealed at 500, 600, and 700 ℃ to form In203 nanofibers. The as-prepared In203 nanofibers were characterized using X-ray diffraction （XRD）, thermal gravimetry and differential thermal analysis （TG/DTA）, and field-emission scanning electron microscopy （FE-SEM）. The results show that the In2O3 nanofibers crystallize well, with a small average grain size （about 24 nm） and a good mesoporous structure, when annealed at 500 ℃. The In203 nanofibers annealed at the three temperatures were further used to fabricate gas sensors. The test results show that the sensor based on In203 annealed at 500℃ has the highest response （about 7） to 10x 10-~ （volume fraction, ℃） formaldehyde （HCHO） at an operating temperature of 240 ℃. CdO nanoparticles were also prepared using the same method; XRD and FE-SEM show that the average grain size of CdO is about 68 nm. Finally, the as-prepared In203 nanofibers were mixed with the as-prepared CdO in molar ratios of 1：1, 10：1, and 20：1, and the mixtures were used to fabricate gas sensors. The HCHO-sensing properties of the sensors based on pure In2O3 and In2O3/CdO composites with different molar ratios were investigated at each optimum temperature. The results show that the In2O3/CdO composite with a molar ratio of 10：1 has excellent sensing properties： the response to 10x 10-6 HCHO is 13.6, the response/recovery time is 140 s/32 s, and the selectivity is better at a lower operating temperature of 200 ℃. In addition, the HCHO-sensing mechanism of the sensors based on the In2O3/CdO composites was briefly analyzed.
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