Humidity‐Sensing Properties of Ag0 Nanoparticles Supported on WO3‐SiO2 with Super Rapid Response and Excellent Stability. Issue 31 (16th October 2015)

• Record Type: Journal Article
• Authors: Tomer, Vijay K.; Duhan, Surender; Sharma, Ashok K.; Malik, Ritu; Jangra, Suman; Nehra, S. P.; Devi, Sunita
• Is Part Of: European journal of inorganic chemistry. Issue 31(2015)
• Page Start: 5232
• Page End: 5240
• Publication Date: 2015-10-16
• Subjects: Sensors -- Surface analysis -- ­Nanoparticles -- Water chemistry -- Meso­porous materials; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201500858
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract: Ag 0 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 Ag 0 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. Abstract : The rapid response (6 s) and recovery time (8 s) of an Ag‐WO3 /SiO2 nanocomposite is described. The results show that the material exhibits excellent sensitivity, stability, durability, and relatively low hysteresis between 11 and 98 % relative humidity (RH) at room temperature.