Humidity‐Sensing Properties of Ag 0 Nanoparticles Supported on WO 3 ‐SiO 2 with Super Rapid Response and Excellent Stability

Autor: Vijay K. Tomer, Suman Jangra, Ritu Malik, Ashok K. Sharma, Sunita Devi, S. P. Nehra, Surender Duhan
Rok vydání: 2015
Předmět:
Zdroj: European Journal of Inorganic Chemistry. 2015:5232-5240
ISSN: 1099-0682
1434-1948
DOI: 10.1002/ejic.201500858
Popis: Ag0 nanoparticles supported on WO3/SiO2 nanocomposites were synthesized in two steps by using a sequential combination of in situ and wet impregnation loading processes. Initially, WO3 (5 wt.-%) was loaded onto SiO2 by using an in situ process, followed by impregnation of the WO3/SiO2 nanocomposite with AgNO3 (1, 3 and 5 wt.-%). After calcination, the Ag0 nanoparticles were located inside the pore channels of the Ag-WO3/SiO2 complex nanohybrid. The humidity-sensing results show that the material exhibits excellent sensitivity, rapid response/recovery, stability, durability, and a relatively low hysteresis towards relative humidity (RH) at room temperature. In particular, the material shows a 3-fold higher sensitivity compared with that of WO3/SiO2 along with very rapid response times. The huge improvement in sensitivity may be credited to the chemical and electronic refinement actuated by the Ag nanoparticles inside the pore channels of the WO3/SiO2. The findings reported in this study will be helpful for the development of complex mesoporous hybrid nanocomposites with improved RH-sensing performance.
Databáze: OpenAIRE
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