Ceria-doped SnO2 sensor highly selective to ethanol in humid air
Ceria-doped SnO2 sensor highly selective to ethanol in humid air
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DOI：
10.1016/j.snb.2007.10.018
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发表时间：
2008-03
影响因子：
8.4
通讯作者：
F. Pourfayaz;Y. Mortazavi;A. Khodadadi;S. Ajami
中科院分区：
文献类型：
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作者：
F. Pourfayaz;Y. Mortazavi;A. Khodadadi;S. Ajami
在我们早期的研究中，我们报道了在300°C下，2.0wt.% CeO 2掺杂SnO 2传感器在CO和CH 4气体存在下对乙醇具有高度选择性[F. Pourfayaz，A.霍达达迪湾Mortazavi，S.S. Mohajerzadeh，在CO、LPG和CH 4存在下对乙醇具有选择性的掺杂CeO 2的SnO 2传感器，Sens. Actuators B 108（2005）172-176]。在本研究中，我们报道了环境空气湿度对掺杂2.0wt.%的SnO_2乙醇选择性传感器的影响。CeO2。对乙醇的最大响应发生在300°C，其随相对湿度降低。对于30 ° C、40 °C和50°C的不同环境空气温度，相对湿度从0变化到80%，并且在250-450°C的温度范围内监测传感器的响应。随着50°C空气中的相对湿度从0增加到30%，观察到对乙醇的最大响应降低15%。相对湿度的进一步增加不再显著降低响应。湿度的存在改善了传感器对CO和CH 4的响应，直到350°C，之后改善的程度变得较小，并且在450°C几乎减少。该传感器被证明是相当有选择性的乙醇在含有CO和CH 4的湿空气的存在下。选择性在300°C时达到最大值;但在更高的操作温度下会下降。
In our earlier study, we reported that at 300°C, a 2.0wt.% CeO2-doped SnO2sensor is highly selective to ethanol in the presence of CO and CH4gases [F. Pourfayaz, A. Khodadadi, Y. Mortazavi, S.S. Mohajerzadeh, CeO2doped SnO2sensor selective to ethanol in presence of CO, LPG and CH4, Sens. Actuators B 108 (2005) 172–176]. In the present investigation, we report the influence of ambient air humidity on the ethanol selective SnO2sensor doped with 2.0wt.% CeO2. Maximum response to ethanol occurs at 300°C which decreases with the relative humidity. The relative humidity was changed from 0 to 80% for different ambient air temperatures of 30, 40 and 50°C and the response of the sensor was monitored in a 250–450°C temperature range. As the relative humidity in 50°C air increased from 0 to 30%, a 15% reduction in the maximum response to ethanol was observed. A further increase in the relative humidity no longer reduced the response significantly. The presence of humidity improved the sensor response to both CO and CH4up to 350°C after which the extent of improvement became smaller and at 450°C was almost diminished. The sensor is shown to be quite selective to ethanol in the presence of humid air containing CO and CH4. The selectivity passes a maximum at 300°C; however it declines at higher operating temperatures.