ELECTRICAL-PROPERTIES AND IMPROVEMENT OF THE GAS SENSITIVITY IN MULTIPLE-DOPED SNO2
ELECTRICAL-PROPERTIES AND IMPROVEMENT OF THE GAS SENSITIVITY IN MULTIPLE-DOPED SNO2
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DOI：
10.1016/0925-4005(94)01551-r
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发表时间：
1995-05-01
影响因子：
8.4
通讯作者：
FLIEGEL, W
中科院分区：
文献类型：
--
作者：
BEHR, G;FLIEGEL, W
通过观察形貌、电学和气敏性能，研究了温度处理和多重掺杂对掺杂 SnO2 气敏性能的影响。在 600 摄氏度下烧制不同的单掺杂传感器元件，发现气体灵敏度与传感器元件的电阻率呈线性相关。与在 900 摄氏度下烧制的传感器相比，观察到的气体灵敏度更高的转变是由较小的晶粒尺寸引起的。这通过粉末比表面积的测定得到证明。然而，在这种情况下，掺杂剂不完全并入主体中可能会导致长期稳定性问题。使用 Nb（产生更细的粉末）和 Mn（高电子补偿）的多重掺杂，可以合成具有小晶粒尺寸的高电子补偿粉末。与单掺杂粉末相比，在特定的掺杂浓度范围内观察到气体灵敏度的提高。这种改进可以通过考虑估计的电子浓度、微晶尺寸、电子耗尽层的厚度和每个微晶的电子总数之间的关系来解释。
The influence of temperature treatment as well as of multiple doping on the gas sensing properties of doped SnO2 was investigated by observing the morphological, electrical and gas sensing properties. Firing the different single-doped sensor elements at 600 degrees C, a linear dependence of the gas sensitivity on the resistivity of the sensor elements was found. The observed shift to higher gas sensitivities in comparison to sensors fired at 900 degrees C is caused by smaller crystallite sizes. This was proved by the determination of the specific surface area of the powders. However, the incomplete incorporation of the dopants into the bulk, in this case, may cause problems with long-term stability. Using multiple doping with Nb (resulting in finer powders) and Mn (high electron compensation), the synthesis of high electron compensated powders with small crystallite sizes is possible. The improvement of the gas sensitivity in comparison to single-doped powders was observed for a special range of doping concentrations. This improvement can be explained considering the relationship between an estimated electron concentration, crystallite size, thickness of the electron depletion layer and total number of electrons per crystallite.