Highly Efficient Room-Temperature Gas Sensor Based on TiO₂Nanotube-Reduced Graphene-Oxide Hybrid Device

Abstract

In this paper, a highly efficient room temperature gas-sensor device based on the hybrid structure of TiO 2 nanotubes (TNTs) and Reduced Graphene Oxide (RGO) is reported. TiO 2 NTs were grown by electrochemical anodization technique followed by electro-deposition of RGO layer in the form of discrete islands. Synergistic hybridization of the two different sensing elements was found to be superior when compared with the performance of the individual ones. Room temperature (~27°C) gas-sensing performance, with methanol as a test species, was carried out and the fastest response and recovery times, reported so far, were achieved due to high carrier mobility of RGO. On the other hand, appreciably high response magnitude (96.93% at 800 ppm) was obtained due to increased number of gas-interaction sites and availability of free surface energy provided by titania nanotubes and RGO. A comparative discussion elucidating the role of TiO 2 NTs-RGO junctions has also been presented co-relating the experimental findings.Index Terms-TiO 2 nanotubes, RGO, hybrid junction, methanol sensor, room temperature, fast response.

A Review on Metal Oxide-Graphene Derivative Nano-Composite Thin Film Gas Sensors

“…Figure 8 [55], (b) WO 3 nanorods/graphene composites [56], and (c) ZnO/G array structures [30]. Synthesis of TiO 2 nanotubes array was done by electrochemical anodization of metallic titanium films [60] and rGO/TiO 2 nanotubes composite was synthesized by electrodeposition of rGO on TiO 2 nanotubes [61,62]. Electrodeposition method was also used to synthesize ZnO nanorods and selective electrochemical etching of those nanorods to synthesized ZnO nanotubes.…”

“…However, the overall study envisages the potential gas sensing of 1-D metal oxides functionalized by graphene, GO, and rGO. The 1-dimensional structure of TiO 2 nanotubes (NTs) in its hybrid with rGO provided large amount of gas interaction sites which lead to high response magnitude of the sensor [61]. Table 3 shows gas sensing performance of 2-D metal oxides and GO (or rGO) nanocomposites where ZnO, SnO 2 , and WO 3 nanosheets were used as 2-D materials.…”

Exploring SnxTi1−xO2 Solid Solutions Grown onto Graphene Oxide (GO) as Selective Toluene Gas Sensors

“…Metal oxide semiconductors (MOS) such as ZnO [13,14], SnO 2 [15,16] and TiO 2 [17,18] exhibit remarkable sensitivity towards a wide range of both reducing and oxidizing gases. However, their major drawback is their lack of selectivity in the presence of several interfering species.…”

Application of Graphene Hybrid Materials in Fault Characteristic Gas Detection of Oil-Immersed Equipment

“…According to previous studies, effective detection of seven typical fault characteristic gases, including H 2 , CO, CO 2 , CH 4 , C 2 H 2 , C 2 H 4 , and C 2 H 6 , can reflect the operation state of oil immersed power equipment (Bakar et al, 2014 ). Recently, a lot of research has been carried out on using graphene hybrid materials to detect these gases for rapid and accurate fault detection of oil-immersed equipment (Acharyya and Bhattacharyya, 2016 ; Zhou et al, 2016 ; Nasresfahani et al, 2017 ; Zhang et al, 2017b ).…”