In this paper, carbon aerogel (CA)-polyaniline (PANI) composites were prepared and first applied in the study of H2S gas sensing. Here, 1 and 3 wt% of as-obtained CA powder were blended with PANI to produce composites, which are denoted by PANI-CA-1 and PANI-CA-3, respectively. For the H2S gas-sensing studies, the interdigitated electrode (IDE) was spin-coated by performing PANI and PANI-CA composite dispersion. The H2S gas-sensing properties were studied in terms of the sensor’s sensitivity, selectivity and repeatability. IDE coated with PANI-CA composites, as compared with pristine PANI, achieved higher sensor sensitivity, higher selectivity and good repeatability. Moreover, composites that contain higher loading of CA (e.g., 3 wt%) perform better than composites with lower loading of CA. At 1 ppm, PANI-CA-3 displayed increased sensitivity of 452% at relative humidity of 60% with a fast average response time of 1 s compared to PANI.
A variety of benzimidazole by the heterocyclization of orthophenylenediamine were synthesized in 69–86% yields. The synthesized compounds
3a-f
and
6a-f
were characterized and further investigated as jack bean urease inhibitors. Density functional theory (DFT) studies were performed utilizing the basis set B3LYP/6-31G (d, p) to acquire perception into their structural properties. Frontier molecular orbital (FMO) analysis of all compounds 3a–f and 6a-f was computed at the same level of theory to get a notion about their chemical reactivity and stability. The mapping of the molecular electrostatic potential (MEP) over the entire stabilized molecular geometry indicated the reactive centers. They exhibited urease inhibition activity with IC50 between 22 and 99 μM. Compounds containing withdrawing groups on the benzene ring (
3d, 6d
) were not showing significant urease inhibition. The value obtained for
3a, 3b, 3f
had shown their significant urease inhibition for both theoretical and experimental. Notably, the compound having S-configuration (
3a
) (22.26 ± 6.2 μM) was good as compared to its R enantiomer
3f
(31.42 ± 23.3 μM). Despite this, we elaborated the computational studies of the corresponding compounds, to highlight electronic effect which include HOMO, LUMO, Molecular electrostatic potential (MEP) and molecular docking.
In this article, the fabrication of interdigitated electrode (denoted by IDE) H 2 S sensor based on electroactive polyamic acid (denoted by EPAA) containing oligoaniline in the main chain is first demonstrated. First step involved the synthesis of aminocapped aniline trimer (denoted by ACAT). Subsequently, the EPAA and correspondent electroactive polyimide (EPI) was prepared by reacting ACAT and 4,4′-(4,4′-isopropylidene-diphenoxy)bis(phthliic anhydride (BSAA), followed by characterization. For the study of gas sensing, hydrophilic EPAA was found to show better sensitivity of H 2 S gas at the concentration of 50 ppm on IDE as compared to that of hydrophobic EPI. Therefore, as-prepared EPAA with higher gas sensitivity was chosen to process four distinctive morphological images (film, bead, bead-fiber, and fiber) on IDE through electro-spinning technique for following comparative studies in sensitivity, repeatability, response/recovery time and selectivity of H 2 S gas. The surface image of EPAA upon IDE exhibiting four distinctive morphologies was observed by SEM. The IDE with fiber morphology was found to show the shortest response time and longest recovery time of H 2 S gas as compared to other comparative counterparts. Moreover, IDE coated by four distinctive morphological images of EPAA was all show good repeatability of H 2 S gas sensing at specific concentration range.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.