摘要
用化学共沉淀法制备了α－Ｆｅ２Ｏ３掺杂的Ｉｎ２Ｏ３纳米晶微粉，研究了α－Ｆｅ２Ｏ３掺杂对Ｉｎ２Ｏ３电导和气敏性能的影响．结果表明，α－Ｆｅ２Ｏ３和 Ｉｎ２Ｏ３间可形成有限固溶体Ｉｎ２－ｘＦｅｘＯ３（０≤ｘ≤０．４０）；Ｆｅ３＋对 Ｉｎ２Ｏ３晶格中Ｉｎ３＋格位的部分取代，大大增强了阴阳离子间的结合力，导致材料中氧空位Ｖｏｘ数骤降、自由电子的浓度变稀和电导下降．ｎ（Ｆｅ３＋）：ｎ（Ｉｎ３＋）＝５：５的共沉淀粉于 ８００℃下灼烧 ４ ｈ所得的 α－Ｆｅ２Ｏ３掺杂Ｉｎ２Ｏ３传感器元件，对 ４５μｍｏｌ·Ｌ－１Ｃ２Ｈ５ＯＨ的灵敏度达５４．０，为相同浓度干扰气体汽油的８倍多．
Nanocrystalline powder of In2O3 mixed with a-Fe2O3 is prepared by chemical coprecipitation, ef-fects of a-Fe2O3 on the conductance and gas-sensing properties of In2O3 are investigated. The results demonstrate that partial solid solution In2-xFexO3 (o≤x≤0. 40) can be formed between α-Fe2O3 and In2O3; Partial lattice substituting of Fe3 + to In3 + can notably enhance the combining force between anion and cation, it causes oxygen vacancy to decrease, free electron density to be reduced and the conductance to be poorer(to see Fig. 2). The sensitivity of sensor, which is prepared with 5: 5 n (Fe3+) and n (In3+) calcined at 800℃ for 4 ｈ, to 45 μmol ·L-1C2H3OH can reach the value of 54. 0. This is eight times more than that of petrol with the same concentration
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2001年第10期887-891,共5页
Acta Physico-Chimica Sinica
基金
安徽省教育厅自然科学基金资助项目
