Synthesis of a Surface Photovoltage Sensor Using Self‐Ordered Tin‐Modified MCM‐41 Films: Enhanced NO₂ Gas Sensing

Abstract

A self-ordered and structure-controlled tin-modified mesoporous MCM-41 film was prepared by a molecule surfactant template method using spin-coating. This film was then used to fabricate a surface photovoltage (SPV) NO 2 gas sensor, based on a metal ± insulator ± semiconductor (MIS) structure. The SPV sensor thus produced showed a high sensitivity for NO 2 gas concentrations of 1 ppm, at room temperature. The sensor's responsiveness was also investigated. Compared to a SPV sensor with a pure mesoporous MCM-41 film, the tin-modified mesoporous MCM-41 film showed enhanced sensing properties for NO 2 .Mesoporous materials have attracted considerable attention because of their large surface area and porosity, uniform pore size distribution, ordered pore arrangement, and possible surface engineering. Since the first report of mesoporous silica (named MCM-41) in 1992, [1, 2] a number of studies have been performed aimed at modifying the mesoporous material structure in order to increase the potential applicability of these materials.

Improving MCM‐41 as a Nitrosamines Trap through a One‐Pot Synthesis

“…MCM‐41 has a pore size of 2.1 nm due to the acidic synthesis conditions; this value coincides with those in the literature 29. 34, 35 On the other hand, all the cM n samples have larger average pore sizes of 2.5–2.6 nm (Figure 2 B). The most‐significant change was displayed by cM10, whose pore size increased from 2.1 to 2.59 nm.…”

Surface photocurrent gas sensor with properties dependent on Ru(dcbpy)2(NCS)2-sensitized ZnO nanoparticles

“…One of the methods to settle this problem is to use light excitation to increase the concentration of electrons in conductance band. Analogous researches have already been reported [9][10][11]. For an n-type semiconductor, the major carriers, i.e.…”

Mesoporous materials as gas sensors

“…By using mesoporous silica materials such as MCM-41 and SBA-16, NO and NO 2 gases were monitored in low concentrations at room temperature. [234][235][236][237]…”