Impedimetric humidity sensing studies of Ag doped MCM-41 mesoporous silica coated on silver sputtered interdigitated electrodes. (October 2020)

• Record Type: Journal Article
• Authors: Kunchakara, Suhasini; Ratan, Amar; Dutt, Meenakshi; Shah, Jyoti; Kotnala, R.K.; Singh, Vaishali
• Is Part Of: Journal of physics and chemistry of solids. Volume 145(2020)
• Publication Date: 2020-10
• Subjects: Ag-MCM-41 -- Mesoporous silica -- Humidity sensing -- Doping -- Silver thin films; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2020.109531
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: Silver nitrate of desired concentration was doped in the as-synthesized MCM-41 mesoporous silica and the prepared samples are spin coated onto interdigitated thin films with silver on glass slide. The interdigitated thin film electrodes made of silver were fabricated by RF-magnetron sputtering with power of 60 W at 7.2 × 10 −2 mbar. The synthesized samples were characterized for structural and morphological features using Fourier-Transform Infrared Spectroscopy (FTIR), BET studies and Transmission Electron Microscopy (TEM). Effect of change in the impedimetric analysis for humidity across the interface has been explored. The impedance of Ag-MCM-41 sample changed five orders of magnitude across the humidity range 11%–93% RH. The x Ag-MCM-41, where x = 0.07 g has been the better sample for humidity sensing at room temperature. The impedance studies indicate that the sensor system Ag-doped MCM-41 spin coated on silver sputtered interdigitated electrodes is an appropriate candidate to fabricate humidity sensors with enhanced sensing performance. Highlights: Five order of magnitude change in impedance from undoped to Ag doped MCM-41 sample. In-house sensor system of silver interdigitated electrodes and Ag doped MCM-41. Ag doped MCM−41 displayed response and recovery time of 24 s and 32s, respectively. The hysteresis of the as-synthesized sample was 1.2% with standard deviation.