Mg-doped InSnO nanofiber field-effect transistor for methanol gas detection at room temperature

Abstract

Research on high-performance gas sensors for detecting toxic and harmful methanol gas is still a very important issue. For gas sensors, it is very important to be able to achieve low concentration detection at room temperature. In this work, we used the electrospinning method to prepare Mg-doped InSnO nanofiber field-effect transistors (FETs) methanol gas sensor. When the Mg element doping concentration is 2.3 mol.%, InSnO nanofiber FET exhibits excellent electrical properties, including higher mobility of 3.17 cm2 V−1 s−1, threshold voltage of 1.51 V, subthreshold swing of 0.42 V/decade, the excellent on/off current ratio is about 108 and the positive bias stress stability of the InSnO nanofiber FET through Mg doping has been greatly improved. In addition, the InSnMgO nanofiber FET gas sensor exhibits acceptable gas selectivity and sensitivity to methanol gas at room temperature. In the methanol gas sensor test at room temperature, when the methanol gas concentration is 60 ppm at room temperature, the response value of the InSnMgO nanofiber FET gas sensor is 81.92; and when the methanol concentration is 5 ppm, the response value is still 1.21. This work provides an effective and novel way to build a gas sensor at room temperature and use it to detect methanol gas at room temperature.

Low-temperature fabrication of Pr-doped In2O3 electrospun nanofibers for flexible field-effect transistors

“…11 Among these NFs, indium-based oxides such as In-Zn-O, In-Sn-O and In-Ga-Zn-O have been widely used in highperformance FETs. [12][13][14] However, as a typical solution process, MO-NFs usually need to undergo a high-temperature (Z500 1C) annealing process after electrospinning, enabling the synthesis of MO-NFs from metallic salt precursors. Such a high annealing temperature exceeds the maximum temperatures that most plastic substrates (such as polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET) and polycarbonate (PC)) can withstand; thus, most of the previous MO-NFs were developed on silicon or glass substrates.…”

Machine Learning-Assisted Sensor Based on CsPbBr3@ZnO Nanocrystals for Identifying Methanol in Mixed Environments

“…14−16 Using a field effect transistor is a potential technical solution to improving sensing speed and baseline stability. 17,18 Conductometry-based sensors are considered to fulfill many of the required criteria for various applications. 19 So far, metal oxide semiconductors (MOSs) are the main materials used in methanol sensors, such as SnO 2 −ZnO composite nanofibers 20 and In 2 O 3 porous nanospheres.…”

“…A wide variety of gas sensing technologies were developed (e.g., resistive, capacitive). Capacitive sensors are static devices that do not consume high power for sensing and are capable of working at room temperature (RT) with good linearity compared with resistive sensors, despite limitations in the response speed and limit of detection. − Using a field effect transistor is a potential technical solution to improving sensing speed and baseline stability. , Conductometry-based sensors are considered to fulfill many of the required criteria for various applications . So far, metal oxide semiconductors (MOSs) are the main materials used in methanol sensors, such as SnO 2 –ZnO composite nanofibers and In 2 O 3 porous nanospheres .…”