Effect of Tin Addition on Mesoporous Silica Thin Film and Its Application for Surface Photovoltage NO₂ Gas Sensor

Abstract

Self-ordered and structure-controlled transparent films of tin-modified mesoporous silica (Sn/Si ratio of 0.5-3%) were first prepared using a molecule surfactant template method employing spin coating. A surface photovoltage (SPV) NO(2) gas sensor was then fabricated using these self-ordered tin-modified mesoporous silica thin films based on a metal-insulator-semiconductor structure. Highly sensitive tin-modified mesoporous silica was obtained that could detect NO(2) gas concentrations of as low as 300 ppb at room temperature. The detection mechanism for NO(2) is believed to involve both the surface area, which contributes to the change in dielectric constant, and the amount of tin incorporated, which contributes to the change in charge. It was found that, in this SPV sensor, the optimal Sn/Si ratio of 0.5% delivered record-high sensing performance.

Applications of Amine-functionalized Mesoporous Silica in Fine Chemical Synthesis

“…1000 m 2 /g) are technologically promising for applications in catalysis [3,4], sensors [5], electronic devices [6], and biomedicines [7]. Many researches have focused on the preparation of organic functionalized materials to expand the applications by either direct incorporation of organic groups through co-condensation or grafting the organic groups onto the surface of the calcined mesoporous silica [8][9][10][11][12][13][14][15].…”

Novel optical NO2-selective sensor based on phthalocyaninato-iron(II) incorporated into a nanostructured matrix

“…In order to develop NO 2 -sensors based on MP, the following gas-permeable supports were used: (1) pre-cleaned glass slides [14]; (2) gold-coated optical waveguides [24]; (3) tinmodified mesoporous silica [25]; (4) SnO 2 [26]; (5) porous silicon [27]; etc. A variety of techniques such us vacuum sublimation, plasma-activated evaporation, solvent evaporation from a fine suspension, spin-coating, Langmuir-Blodgett and self-assembly deposition were used to produce these sensors.…”

Size-tunable fabrication of multifunctional Bi2O3 porous nanospheres for photocatalysis, bacteria inactivation and template-synthesis

“…[5][6][7] However, the construction of a multifunctional architecture by deliberately combining different useful functions into one material is still limited and remains a challenge. [9][10][11][12][13] For example, mesoporous SiO 2 could be used as a drug delivery carrier in biomedicine, 8,14 an excellent noble metal or metal oxide support in catalysis and chemical sensing, 15,16 as well as a hard template in fabricating novel hollow nanostructures. Porous/hollow nanostructures with designed chemical components, controlled morphologies and tunable sizes are good candidates owing to their high surface area, low density and high loading capacity, which endow them with multifunctional capabilities.…”