Highly sensitive C2H5OH sensors using Fe-doped NiO hollow spheres
Highly sensitive C2H5OH sensors using Fe-doped NiO hollow spheres
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DOI：
10.1016/j.snb.2012.06.029
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发表时间：
2012-08-01
影响因子：
8.4
通讯作者：
Lee, Jong-Heun
中科院分区：
文献类型：
--
作者：
Kim, Hyo-Joong;Choi, Kwon-Il;Lee, Jong-Heun
通过在镍球上均匀包覆镍和铁前驱体，在300℃下使镍球表面附近部分氧化，用稀HCl水溶液溶解核镍，随后在500℃下进行热处理，制备了壳厚度约为12 nm的NiO和Fe掺杂NiO空心球，并比较了它们在300-400℃下的气敏特性。 Fe掺杂NiO空心球在350℃下对100 ppm C2H5OH的响应（R-g/R-a = 172.5；气体中的R-g电阻；空气中的R-a电阻）比NiO空心球（R-g/R-a = 5.5）高31.4倍。通过将 Fe 掺杂到 MO 空心球中，C2H5OH 响应显着增强的原因与 Fe 组分掺入 NiO 晶格及其对气敏反应的影响进行了讨论。 (C) 2012 Elsevier B.V. 保留所有权利。
NiO and Fe-doped NiO hollow spheres with the shell thickness of similar to 12 nm have been prepared by applying uniform coatings of Ni- and Fe-precursors onto Ni spheres, partial oxidation of Ni spheres near their surfaces at 300 degrees C, the dissolution of core Ni using dilute HCl aqueous solution, and subsequent heat treatment at 500 degrees C. and their gas sensing characteristics at 300-400 degrees C were compared. The response to 100 ppm C2H5OH of Fe-doped NiO hollow spheres at 350 degrees C (R-g/R-a = 172.5; R-g resistance in gas; R-a resistance in air) was 31.4 times higher than that of NiO hollow spheres (R-g/R-a = 5.5). The reasons for the significant enhancement of C2H5OH response by doping Fe into MO hollow spheres were discussed in relation to the incorporation of Fe components into the NiO lattice and their consequent impact on the gas sensing reaction. (C) 2012 Elsevier B.V. All rights reserved.