Pd/Pt-Bimetallic-Nanoparticle-Doped In[sub.2]O[sub.3] Hollow Microspheres for Rapid and Sensitive H[sub.2]S Sensing at Low Temperature

• Published in: Nanomaterials (Basel, Switzerland) Vol. 13; no. 4
• Main Authors: Jiang, Kaisheng, Chen, Tingting, Sun, Jianhai, Quan, Hao, Zhou, Tianye
• Format: Journal Article
• Language: English
• Published: MDPI AG 01.02.2023
• Subjects: Analysis; Chemical synthesis; Hydrogen sulfide; Indium; Mechanical properties; Methods; Nanoparticles; Oxides; Palladium; Platinum; Sensors; Structure; China
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano13040668

H[sub.2] S is a poisonous gas that is widespread in nature and human activities. Its rapid and sensitive detection is essential to prevent it from damaging health. Herein, we report Pd- and Pt-bimetallic-nanoparticle-doped In[sub.2] O[sub.3] hollow microspheres that are synthesized using solvothermal and in situ reduction methods for H[sub.2] S detection. The structure of as-synthesized 1 at% Pd/Pt-In[sub.2] O[sub.3] comprises porous hollow microspheres assembled from In[sub.2] O[sub.3] nanosheets with Pd and Pt bimetallic nanoparticles loaded on its surface. The response of 1 at% Pd/Pt-In[sub.2] O[sub.3] to 5 ppm H[sub.2] S is 140 (70 times that of pure In[sub.2] O[sub.3] ), and the response time is 3 s at a low temperature of 50 °C. In addition, it can detect trace H[sub.2] S (as low as 50 ppb) and has superior selectivity and an excellent anti-interference ability. These outstanding gas-sensing performances of 1 at% Pd/Pt-In[sub.2] O[sub.3] are attributed to the chemical sensitization of Pt, the electronic sensitization of Pd, and the synergistic effect between them. This work supplements the research of In[sub.2] O[sub.3] -based H[sub.2] S sensors and proves that Pd- and Pt-bimetallic-doped In[sub.2] O[sub.3] can be applied in the detection of H[sub.2] S.