Preparation of nanosensors based on organic functionalized MWCNT for H2S detection

► H2S detection in natural gas (about 160ppm) at different operating temperatures (25–80°C) was investigated. ► MWCNT was obtained by enhanced CVD method over Co-Mo/MgO catalyst in reasonable operation conditions. ► Operating temperatures and type of additives greatly affect on gas sensors response time and recovery. ► Amides are good candidates in sensors to operate at room temperatures. The effects of various organic functional groups on electrical responses of multiwalled carbon nanotube sensors for H2S detection in natural gas (about 160ppm) at different operating temperatures (25–80°C) were investigated. The experimental results showed that the amino groups functionalized carbon nanotube nanosensor displayed good chemical sensitivity (25–30%) at room temperature because of NH reactive sites on the tubes while MWCNT group had excellent performances at higher temperatures. The mechanistic of optimum conditions for functionalized MWCNT based nanosensors and their characterization are strongly going to be discussed.