An ultra-sensitive NH₃ gas sensor enabled by an ion-in-conjugated polycroconaine/Ti₃C₂T_x core–shell composite

Abstract

MXenes are emerging sensing materials due to their metallic conductivity and rich surface chemistry for analytes, however, suffer from poor stability. Incorporating with functional polymers can largely prevent the performance...

MXene-Based Elastomer Mimetic Stretchable Sensors: Design, Properties, and Applications

“…Consequently, a better charge transfer between ammonia and MXene can occur in oxygen-enriched MPCs. This synergistic effect can be theoretically investigated from the polymeric perspective [ 235 ]. An ion-in-conjugated polymer, namely poly(1,5-diaminonaphthalenecroconaine) (PDAC), was evaluated for ammonia sensing.…”

Room-temperature chemiresistive ammonia sensors based on 2D MXenes and their hybrids: recent developments and future prospects

“…One such technique for creating a polysquaraine-interpolated Ti 3 C 2 T x hybrid utilizing faster microwave-assisted in situ polymerization was demonstrated by Zhou et al Since the interspace between Ti 3 C 2 T x monolayers is enlarged after polymerization, the aforementioned hybrid demonstrated an enhancement in NH 3 sensing, detecting at least 500 ppb NH 3 with virtue of a sensitivity of 2.2% ppm −1 . [103][104][105] At higher operating temperatures, the sensor response was degraded due to decreased adsorption and increased desorption of the NH 3 at the active sites. Furthermore, higher humidity of the surroundings appears to lower the sensor response to ammonia, potentially due to analyte consumption via the production of NH 4 OH.…”

A synergistic combination of 2D MXene and MoO3 nanoparticles for improved gas sensing at room temperature

“…Therefore, even though Ti 3 C 2 T x can sense ammonia at room temperature due to its properties, due to its very high electrical conductivity, the change in resistance is very reduced and hence the sensitivities are low [31]. One important point to note here in these 2D MXene structures is that since these have a number of free electrons (mainly because of surface Ti atoms), such structures are often unstable and they seek multiple adsorption moieties to become stable [32]. This is, in fact, an opportunity for researchers to explore multiple applications of this electronrich material.…”