Novel methyl‐orange assisted core‐shell polyaniline‐silver nanosheets for highly sensitive ammonia chemiresistors

Abstract

A cost‐effective, eco‐friendly, one‐pot synthesis of a new class of homogenous core‐shell polyaniline‐silver nanocomposite was fabricated with the assistance of supramolecular aggregates of amphiphilic methyl‐orange (MO) and oxidant ions of silver nitrate (AgNO3). The morphology of nanocomposite transforms from spherical (core‐shell type: PA‐1) to plate‐like polygonal particles (PA‐2) with surge in concentration of AgNO3. The strong contrast of the TEM images depicts the presence of silver (Ag) at core and polyaniline (PAN) at the shell. The core‐shell structure of the synthesized nanocomposite was confirmed using KCN washing technique. The SAED pattern reveals the hexagonal nature of PAN‐Ag hybrid nanosheets with [111] orientation with interplanar spacing around 2.4 Å corresponding to face‐centered‐cubic structure of Ag. The X‐ray diffraction spectra reveal the crystalline nature of the hybrid. Furthermore, the chemiresistors fabricated using the PA nanocomposite was analyzed for ammonia (NH3) monitoring behavior. The fabricated room temperature chemiresistor was found to be highly sensitive (~47.1% sensitivity) towards low concentration (as low as 1 ppm) of NH3 with high selectivity and stability, which opens a new window for fabricating cost‐effective commercial sensors.

MnO2-SnO2 Based Liquefied Petroleum Gas Sensing Device for Lowest Explosion Limit Gas Concentration

“…1,2 So, the development of a quick responsive, highly selective, and the stable sensor is the most urgent requirement that should consume less power, trace a small amount of gas, and operate at low temperatures. [3][4][5] Numerous types of nanostructured nanomaterials are used to detect the various type of gases such as metal oxide, conducting polymers, 4,6,7 carbon nanotubes, graphene oxide, and metal-organic framework, etc. [8][9][10] Liquefied petroleum gas (LPG) is a highly explosive gas that is widely used in domestic and industries and it is very harmful to the human being as well as the environment.…”

Green Fabrication of Bioactive Silver Nanoparticles Using Mentha pulegium Extract under Alkaline: An Enhanced Anticancer Activity

“…The crystalline nature of biosynthesized AgNPs herein is different from that biosynthesized by Abdol-Khalegh Bordbar 45 and Hadi Faranak, 46 which may originate from the different nanocomposite. 56 …”

“…The measured d -value was 2.510 Å (Figure D), which was assigned to (0 0 4) facets of hexagonal crystalline AgNPs, further confirming the result about the crystalline nature obtained from the SAED pattern. The crystalline nature of biosynthesized AgNPs herein is different from that biosynthesized by Abdol-Khalegh Bordbar and Hadi Faranak, which may originate from the different nanocomposite …”

“…The crystalline nature of biosynthesized AgNPs herein is different from that biosynthesized by Abdol-Khalegh Bordbar 45 and Hadi Faranak, 46 which may originate from the different nanocomposite. 56 Lastly, the ζ-potential was used to assess the surface state and the long-term stability of biosynthesized AgNPs. Previous studies reported that the nanoparticles with ζ-potentials between −25.0 and +25.0 mV would have interparticle attractions and eventually lead to the aggregation of nanoparticles.…”

Emergence of MXene–Polymer Hybrid Nanocomposites as High‐Performance Next‐Generation Chemiresistors for Efficient Air Quality Monitoring

“…The HNC fabrication is established through visible indicators like color change (green or pale yellow for PAN). [ 37 ] These strategies include dip coating, spin coating, drop‐casting, spray coating, and inkjet printing. In this direction, Jin et al [ 130 ] fabricated the MXP HNC of PEDOT:PSS and Ti 3 C 2 T x using chemical‐based polymerization of EDOT monomer over Ti 3 C 2 T x ‐MXene to manifest PSS ( Figure a).…”