Combustion synthesis of porous Pt-functionalized SnO2 sheets for isopropanol gas detection with a significant enhancement in response
Combustion synthesis of porous Pt-functionalized SnO2 sheets for isopropanol gas detection with a significant enhancement in response
复制标题
用于异丙醇气体检测的多孔 Pt 功能化 SnO2 片的燃烧合成，响应显着增强
DOI：
10.1039/c4ta04251d
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发表时间：
2014-01-01
影响因子：
11.9
通讯作者：
Djerdj, Igor
中科院分区：
文献类型：
--
作者：
Dong, Chengjun;Liu, Xu;Djerdj, Igor
采用易溶燃烧法合成了Pt含量分别为0、0.5、1和2 wt%的铂功能化SnO2薄片，并对其晶体结构、形貌和化学性质进行了全面表征。在燃烧过程中，尿素（CO(NH2)2）被用作燃料。所得产物表现为由相互连接和松散堆积的SnO2纳米颗粒形成的多孔片。铂纳米粒子与SnO2纳米粒子组装在一起，形成了几个到几十纳米的簇。将合成产物作为传感器的传感材料，用于检测异丙醇气体。气敏实验表明，pt官能化SnO2在气体传感器中具有很高的应用前景，因为它的工作温度低于现有的IPA传感器，并且对IPA的响应显着增强。在220°C的优化工作温度下，2 wt% Pt-SnO2片基气体传感器在100 ppm IPA下的响应值为190.50，而原始SnO2基气体传感器在相同条件下的响应值仅为21.53。Pt纳米颗粒对SnO2的电子敏化、催化氧化（溢出效应）以及SnO2表面氧含量的增加的作用是解释Pt功能化SnO2片基气体传感器响应显著增强的合理原因。
Pt-functionalized SnO2 sheets with Pt contents of 0, 0.5, 1, and 2 wt% were synthesized by a facile solution combustion synthesis, and their crystal structure, morphology, and chemistry have been thoroughly characterized. In the combustion process, the urea (CO(NH2)2) has been employed as a fuel. The obtained products appear as porous sheets formed by the interconnected and loosely packed SnO2 nanoparticles. Pt nanoparticles are assembled together with SnO2 nanoparticles in several up to tens of nanometer clusters. The as-synthesized products were used as sensing materials in the sensors to detect the isopropanol (IPA) gas. Gas sensing tests exhibited that the Pt-functionalized SnO2 are highly promising for gas sensor applications, as the operating temperature was lower than current IPA sensors and the response to IPA was significantly enhanced. The 2 wt% Pt–SnO2 sheet based gas sensor displayed a response value of 190.50 for 100 ppm IPA at an optimized operating temperature of 220 °C, whereas the pristine SnO2 based gas sensor only showed a response of 21.53 under the same conditions. The roles of Pt nanoparticles on electronic sensitization of SnO2, catalytic oxidation (spillover effect), and the increased quantities of oxygen species on the surface of SnO2 are plausible reasons to explain the significant enhancement in response to a Pt-functionalized SnO2 sheet based gas sensor.