Enhancing performance of FSP SnO2-based gas sensors through Sb-doping and Pd-functionalization
Enhancing performance of FSP SnO2-based gas sensors through Sb-doping and Pd-functionalization
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DOI：
10.1016/j.snb.2011.06.044
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发表时间：
2011-11-15
影响因子：
8.4
通讯作者：
Weimar, Udo
中科院分区：
文献类型：
--
作者：
Grossmann, Katharina;Kovacs, Krisztina E.;Weimar, Udo
通过火焰喷雾热解(FSP)，在SnO_2气敏层中掺杂0.01-4wt%Sb和0.01wt%Pd+1wt%Sb。通过X射线衍射仪、BET表面分析和透射电子显微镜对这些材料进行了表征，发现Sb和/或Pd的存在对材料的颗粒尺寸和结晶度没有影响。Sb的加入导致SnO2的基线电阻显著降低；在300℃的干燥空气中可达两个数量级，在300℃的潮湿空气中可达三个数量级，这对于高孔隙率和低颗粒配位数的FSP气敏元件意义重大，因为它们通常会遭受高基线电阻的影响。虽然Sb掺杂改善了基线电阻，但传感器信号(R-0/R-GAS)在所研究的所有浓度下都保持不变。此外，对于SnO2与Pd和Sb掺杂相结合的表面功能化，在不影响传感器信号的情况下，保持了基线电阻的降低。(C)2011爱思唯尔B.V.保留所有权利。
Via flame spray pyrolysis (FSP), SnO2 gas sensing layers have been doped with 0.01-4 wt% Sb as well as 0.01 wt% Pd in combination with 1 wt% Sb. Characterization of these materials through X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface analysis, and transmission electron microscopy (TEM) revealed particle grain sizes and crystallinity unchanged by the presence of Sb and/or Pd. The addition of Sb to SnO2 resulted in the significant decrease in baseline resistance; up to two orders of magnitude in dry air at 300 degrees C and three orders of magnitude in humid air at 300 degrees C, which is significant for FSP-prepared gas sensors with high porosity and low particle coordination number since they typically suffer from high baseline resistance. While the baseline resistance was improved with Sb-doping, the sensor signal (R-0/R-gas) remained constant over all concentrations explored. Moreover, regarding the surface functionalization of SnO2 with Pd in combination with Sb-doping, the reduction of baseline resistance was preserved without influencing sensor signal. (C) 2011 Elsevier B.V. All rights reserved.