He Ke, Jin Zhao, Chu Xiangfeng, Bi Wenjie, Wang Wu, Wang Chao, Liu Shantang
Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology Xiongchu Avenue Wuhan 430073 China
School of Chemistry and Chemical Engineering, Anhui University of Technology Maanshan 243002 Anhui P. R. China.
RSC Adv. 2019 Sep 10;9(49):28439-28450. doi: 10.1039/c9ra04429a. eCollection 2019 Sep 9.
Pd-WO nanosheets were synthesized through a one-step hydrothermal method using NaPdCl solution as the palladium source and sodium tungstate as the tungsten source, and were used to detect acetone. After being characterized by TEM, XRD, BET and XPS, it was found that Pd doped on the surface of WO nanosheets was mainly present as metal palladium, and the specific surface area increased after doping. In addition, the effect of Pd doping on gas sensing properties was studied. When the Pd-doped amount was 2 at%, sensors fabricated with the composites had the best gas sensing performance. Under a 100 ppm acetone atmosphere, the response time was 1 s and the recovery time was 9 s. The detection limit for acetone was 50 ppb at the optimum working temperature of 300 °C, and the selectivity for acetone was excellent under 100 ppm atmosphere ( / = 5.06). The excellent gas sensing properties of this material are mainly attributed to the high catalytic activity and the catalytic spill-over effect of the Pd nanoparticles, which provided additional active sites for the sensitive materials.
以NaPdCl溶液为钯源、钨酸钠为钨源，通过一步水热法合成了Pd-WO纳米片，并将其用于检测丙酮。经透射电子显微镜（TEM）、X射线衍射（XRD）、比表面积分析仪（BET）和X射线光电子能谱（XPS）表征后发现，掺杂在WO纳米片表面的Pd主要以金属钯的形式存在，掺杂后比表面积增大。此外，研究了Pd掺杂对气敏性能的影响。当Pd掺杂量为2at%时，用该复合材料制备的传感器具有最佳的气敏性能。在100ppm丙酮气氛下，响应时间为1s，恢复时间为9s。在300℃的最佳工作温度下，丙酮的检测限为50ppb，在100ppm气氛下对丙酮的选择性优异（ / = 5.06）。这种材料优异的气敏性能主要归因于Pd纳米颗粒的高催化活性和催化溢流效应，为敏感材料提供了额外的活性位点。
