Stable and highly sensitive gas sensors based on semiconducting oxide nanobelts

Abstract

Gas sensors have been fabricated using the single-crystalline SnO2 nanobelts. Electrical characterization showed that the contacts were ohmic and the nanobelts were sensitive to environmental polluting species like CO and NO2, as well as to ethanol for breath analyzers and food control applications. The sensor response, defined as the relative variation in conductance due to the introduction of the gas, is 4160% for 250 ppm of ethanol and −1550% for 0.5 ppm NO2 at 400 °C. The results demonstrate the potential of fabricating nanosized sensors using the integrity of a single nanobelt with a sensitivity at the level of a few ppb.

An enhanced gas ionization sensor from Y-doped vertically aligned conductive ZnO nanorods

“…Gas sensors are generally classified as chemical or physical types based on their operational mechanism. Most of the conventional gas sensors are of the chemical type in which chemisorbed target gases on metal oxide [4][5][6][7], silicon [8] and carbon nanotube (CNT) [2,9,10] substrates are quantified by the responses of their electrical [11] or optical property [12]. However, these types of sensors suffer from limited selectivity [11,13] and difficulties in detecting gases with poor adsorption.…”

Nanowires of metal oxides for gas sensing applications

“…In the beginning of this decade, stable quasi-one-dimensional nanostructures of semiconducting oxides with crystalline structure have been synthesized by thermal evaporation method. [3] Owing to their unique characteristics and for potential application in gas sensing [4] and in other novel microelectronics devices, these nanostructures have attracted a great attention from scientific community.…”

Zigzag GaN/Ga2O3 heterogeneous nanowires: Synthesis, optical and gas sensing properties

“…[1][2][3][4][5] Recently, interest in 1D helical and zigzag nanostructures has been steadily increasing given their attractive morphology and property. 6-8, 24, 25 Zigzag nanowires (NWs) and nanoribbons can be used as highly electronic and optoelectronic devices.…”