Mn‐Loaded Mesoporous Silica Nanocomposite: A Highly Efficient Humidity Sensor

Abstract

We report a relative humidity sensor based on manganese‐nanoparticle‐loaded mesoporous silica SBA‐15 using a facile hydrothermal route. The as‐developed nanocomposite material (Mn/SBA‐15) possesses a high surface area and a high pore volume. The obtained samples were characterized by using low‐angle X‐ray Diffraction (XRD), Fourier‐transform infrared spectroscopy (FTIR), N2 adsorption–desorption, high‐resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), and energy‐dispersive X‐ray (EDX) spectroscopy techniques. The Mn/SBA‐15 exhibited, improved humidity response and recovery time as compared to pure SBA‐15 in the 11%–92% RH range. Optimal results were obtained for the 5 wt% Mn‐loaded SBA‐15 sample, which displayed excellent linearity, low hysteresis, and high humidity response. A change in ~5 orders of magnitude in resistance was observed over 11%–92% RH range. The investigation of humidity sensing properties of Mn/SBA‐15 nanocomposite shows that this material has good prospects as humidity sensor.

One pot synthesis of mesoporous ZnO–SiO 2 nanocomposite as high performance humidity sensor

“…According to literature, the time taken by a sensor to obtain ~90% of overall impedance change is defined as the response time and recovery time in case of humidification and dehumidification, respectively [17]. The comparatively faster adsorption and release of water molecules on the surface/pore channels in nanocomposite I (5) accounts for relatively quicker response and recovery time than obtained in E(5).…”

“…Increasing the surface area of the sensing element is another way to further enhance the RH sensing properties such as sensitivity, response/recovery time, stability, durability, selectivity and hysteresis [13][14][15][16][17]. Recently, ordered mesoporous silica has attained worldwide attention as support for sensing materials due to their large surface area, high porosity, interconnected long pore channels and well organized hexagonal pore arrangement, which causes facile transportation of water molecules across their surfaces [18][19][20][21].…”

A facile nanocasting synthesis of mesoporous Ag-doped SnO 2 nanostructures with enhanced humidity sensing performance

“…Recently, ordered mesoporous semiconductor metal oxides (SMOx), which possess the benefits of extensive surface area, high surface to volume ratio, large pore diameters have remain the focus of major attention in outlining and development of highly sensitive humidity sensors [7][8][9][10]. The presence of porosity empowers water molecules to enter and diffuse all through the material's layer, thereby, directly supporting the protons movement across the material surface.…”

Humidity‐Sensing Properties of Ag0 Nanoparticles Supported on WO3‐SiO2 with Super Rapid Response and Excellent Stability

“…[6][7][8] Over the years, mesoporous SiO 2 has attracted attention as support material for a variety of metals and metal oxides, and has been utilized in applications such as catalysis, sensors, drug delivery, adsorption, and removal of heavy metal ions. [9][10][11][12] Mesoporous SiO 2 , owing to its high specific surface area, large pore volume, high thermal stability, and long, ordered pore channels, can stimulate chemical reactivity and physical adsorption of water molecules and so has attracted significant interest in designing efficient RH sensors. [13][14][15] Yuan et al modified the SiO 2 framework by using ZnO nanoparticles through a simple, one-step sol-gel route.…”