MoSe2/multiwalled carbon nanotube composite for ammonia sensing in natural humid environment

Humidity-Tolerant Room-Temperature Selective Dual Sensing and Discrimination of NH3 and NO Using a WS2/MWCNT Composite

“…The WS 2 /MWCNT composite was synthesized by assembling MWCNTs on 2D WS 2 sheets via a facile two-step method, as schematically shown in Figure . Functionalized MWCNTs were obtained by sonication in acid for 6 h to form MWCNTs-COOH according to the previously reported method . To remove acidic residue, they were washed multiple times with double distilled water and then dried in a vacuum oven at 80 °C for 10 h. Next, a WS 2 composite with functionalized MWCNTs was obtained following our previously described procedure .…”

“…The former, that is, probe sonication, involves the production of intense local heating and excessively large pressure for a shorter duration due to acoustic cavitation. By using this process, a temperature rise of 5000 K has been obtained …”

“…Other vapors of various concentrations were produced by evaporating pure ethanol (99.8 wt %), acetone (99.5 wt %), or concentrated liquid (formaldehyde, 40 wt %). In these cases, a certain volume of vapor was injected into the chamber using a high-precision syringe as described elsewhere. , All measurements were taken under ambient humidity conditions in Amritsar, India over a significant period of time in the months of November to January. The relative humidity in the chamber was monitored by using a wireless digital hygrometer.…”

“…Despite holding excellent features, MWCNT-based gas sensors are challenging to use in commercial applications due to their slow recovery. Based on previous research, substantial improvement in sensing performance can be achieved by combining organic and inorganic materials, thus making their hybrids. ,, Further, dual gas sensing using other 2D materials has been reported for NO 2 /NH 3 , and H 2 /CO at room temperature and for ethanol and methanol at higher temperatures . Huang et al reported sulfonated rGO-decorated SnS 2 materials for room-temperature detection of NO 2 (in ppb) and NH 3 (in ppm) .…”

Facile hydrothermal synthesis of layered 1T′ MoTe2 nanotubes as robust hydrogen evolution electrocatalysts

“…Layered transition metal dichalcogenides (TMDs) have attracted considerable attention in recent decades because of their novel structures and fascinating physical and chemical properties ( Mas-Balleste et al, 2011 ; Xu et al, 2013 ; Tan et al, 2017 ; Ji and Choi, 2022 ). The layered structure consists of a transition metal atom sheet sandwiched between two sheets of chalcogen atoms, such as MX 2 ( M = W, Mo and X = S, Se, Te) ( Qian et al, 2014 ; Sun et al, 2015 ), which has broad prospects for applications in optoelectronics ( Khan and Leuenberger, 2018 ), photodetection ( Malik et al, 2022 ), nanoelectronics ( Wang et al, 2012 ) and electrochemistry ( Chia et al, 2015 ), and has been well-studied in WS 2 , MoS 2 and MoSe 2 based 2D nanostructures in recent years ( Bonaccorso et al, 2015 ; Zhang et al, 2016 ; Manzeli et al, 2017 ; Jha et al, 2019 ; Han et al, 2020 ; Singh et al, 2022a ; Singh et al, 2022b ). In particular, with the demand for effective catalysts for clean energy hydrogen production, TMDs have been widely studied and are considered to be as one of the most outstanding electrocatalysts for the hydrogen evolution reaction (HER) ( Jin et al, 2018 ; Fu et al, 2021 ; Zhang et al, 2021 ; Li et al, 2022 ).…”