Sensing of Vaporous Organic Compounds by TiO₂ Porous Films Covered with Polythiophene Layers

Abstract

This paper describes the detection of volatile organic compounds (VOCs) through analyses of two output signals from integrated microcantilever sensor arrays coated with organic‐inorganic hybrid sensing layers. The surface of TiO2 porous films was modified by amphiphilic terthiophene monomers and the adsorbed monomers were polymerized at the surface of TiO2 nanoparticles. The TiO2 porous films covered with polythiophene layers worked as highly sensitive sensing interfaces to provide two output signals for weight and resistance changes during exposure to VOC vapor. When the TiO2 porous films onto the sensor arrays were dyed with various kinds of amphiphilic monomers with different substituents, the resulting films provide exact information on VOC concentration from the mass changes as well as VOC classification from the analyses of response patterns.

Basic characteristics of polycarbonate-based dual cantilever sensors for detecting VOC

“…Our investigations into the dynamic properties of the polymer cantilevers support the feasibility of miniaturization of the PC cantilever (Shiraishi, et al, 2013). Furthermore, titanium oxide, a material with a large distribution factor can be applied as an adsorption layer (Kimura, et al, 2012). Although further studies are needed, the PC-based cantilever sensors will ultimately satisfy the regulatory requirements for VOC monitoring in semiconductor fabrication facilities.…”

Functionalized polythiophenes: Recognition materials for chemosensors and biosensors of superior sensitivity, selectivity, and detectability

“…For instance, carboxylic acid functionalized terthiophene was immobilized on NPs of TiO 2 , and then either electrochemically or chemically oxidized to form a porous TiO 2 /PT film on the microcantilever surface (Fig. 4a) [108]. With this microcantilever, the change of both the resistance and resonant frequency accompanying injection of VOCs into the N 2 carrier gas ( Fig.…”

“…Similarly, materials with high surface area, such as carbon allotropes and different nanoparticles (NPs), were engaged with PTs for VOCs sensing [107][108][109][110][111]. A simple hybrid chemFET sensor (Fig.…”

“…Do not Type: [114], [115], [82], [83], [79], [116], [104], [75], [96], [98], [102], [106], [109], [108] …”

Electromechanical deformation sensors based on polyurethane/polyaniline electrospinning nanofibrous mats

“…Conductive polymers such as polyaniline, polypyrrle and polythiophene attracted tremendous attention due to a wide variety of applications, including anti-static coating [1][2][3], batteries [4][5][6][7], sensors [8][9][10][11], electrodes [12,13] and so on. Among these conductive polymers, polyaniline (PANi) might be the most promising because of its good environmental stability, ease of synthesis, thermal stability and an inexpensive synthetic route.…”