Supramolecular fabrication of multilevel graphene-based gas sensors with high NO₂ sensibility

Abstract

This study reports the supramolecular assembly of a silver nanoparticle-naphthalene-1-sulphonic acid-reduced graphene oxide composite (Ag-NA-rGO) and its utilization to fabricate a highly sensitive and selective gas sensor. The prepared supramolecular assembly acted not only as a non-covalent functionalization platform (π-π interaction) but was also an excellent scaffold to fabricate a highly sensitive and selective low concentration NO2 gas sensor. The prepared composites were characterized using several techniques, which revealed that the graphene sheets were dispersed as ultrathin monolayers with a uniform distribution of silver nanoparticles. The fabricated multilevel structure exhibited an excellent sensing performance, i.e. 2.8 times better, towards 10 ppm NO2 compared to the NA-rGO and rGO based sensors. Apart from its high sensitivity, superior reversibility and selectivity, the prepared supramolecular assembly exhibited an outstanding linear response over the large concentration range from 1 ppm to 10 ppm. The obtained results demonstrate that the prepared supramolecular assembly holds great potential in the fabrication of efficient and effective low-concentration NO2 gas sensors for practical applications.

One-Step Fabrication of Pyranine Modified- Reduced Graphene Oxide with Ultrafast and Ultrahigh Humidity Response

“…Several methods have been explored to prepare graphene such as mechanical exfoliation 12 , chemical vapor deposition 13, 14 , and epitaxial growth 15 , but the most effective approach should be the chemical reduction mainly because the potential for the relatively low-cost and large-scale fabrication from the view of practical application 16 . Unfortunately, the pristine reduced graphene oxide (rGO) without proper modification is not satisfying when applied as sensors, exhibiting slow response and low sensitivity towards gas or humidity changes 17, 18 . Moreover, the rGO nanosheets tend to irreversibly aggregate during the chemical reduction process, limiting the further devices fabrication.…”

“…To realize the mild and effective modification of rGO, a facile supramolecular assembly modification based on non-covalent interactions such as hydrogen bonding 19 , electrostatic forces 20 , and π-π stacking 21 , is an alternative approach which will maximize the remain of inherent properties of rGO 22 . In addition, supramolecular assembly modification allows more possibilities for functional “guests” such as inorganic ions, organic molecules or nanoparticles 17, 18 , which can be specific to enhance the dispersibility or humidity sensing performance of the as-prepared material.…”

Assembly with copper(ii) ions and D–π–A molecules on a graphene surface for ultra-fast acetic acid sensing at room temperature

“…[10][11][12][13] It is known that the supramolecular assembly of graphene would retain the inherent structure of graphene and construct a better functional gas sensing scaffold. [14][15][16][17] For example, molecules with a D-p-A structure have the ability to notably improve gas sensing characteristics by enhancing the charge transfer between graphene and the assembled molecules. 15 Moreover, the supramolecular assembly of graphene with "guests" can be easily conducted under mild conditions, showing promise for preparing commercial gas sensors.…”

Probe Into the Influence of Crosslinking on CO2 Permeation of Membranes

“…The conventional techniques for capturing CO 2 include “wet scrubbing” using alkaline solutions and membrane separation. However, “wet scrubbing” and traditional membrane separation process possess some drawbacks which include high cost, erosion of equipment and irreversible process1234. Recently, fabrication of CO 2 -responsive materials is regarded as a new approach to solve such drawbacks23456.…”

“…However, “wet scrubbing” and traditional membrane separation process possess some drawbacks which include high cost, erosion of equipment and irreversible process1234. Recently, fabrication of CO 2 -responsive materials is regarded as a new approach to solve such drawbacks23456. Meanwhile, invention of novel membrane separation technology has always attracted great interests in CO 2 capture from economic and environmental points of view due to its various advantages such as low energy cost, high-efficiency, high-stability, ease of fabrication789101112131415.…”