Amplified electrochemical sensor employing Ag NPs functionalized graphene paper electrode for high sensitive analysis of Sudan I

An amphiprotic paper-based electrode for glucose detection based on layered carbon nanotubes with silver and polystyrene particles

“…1A). In contrast to the previously reported papers using the vacuum ltration method, [35][36][37][38] the fabricated CNT-NH 2 -Ag/PS layer would not peel off from the lter paper, thus making it a one-sided coated paper. For the back side of the paper, it still maintained the feature of lter paper, except for some regular spots resulting from vacuum ltration.…”

“…Noticeably, when there were no Ag nanoparticles in the fabrication process, no obvious redox peaks appeared in the CVs, indicating that Ag played a crucial role in determining the electrochemical behaviors of fabricated paper electrodes. This case could be attributed to the unique properties of Ag nanoparticles, such as high redox ability [4 q (Ag + /Ag): 0.799 V], small energy level gaps and favorable electron transfer rate, 37 which made them exhibit excellent activities in diverse elds. 37,54,[57][58][59][60][61] This in turn explained why Ag nanoparticles demonstrated a superior electrochemical performance to other metal particles (Ni, Fe, Cu, Co, Zn, and Al, Fig.…”

“…This case could be attributed to the unique properties of Ag nanoparticles, such as high redox ability [4 q (Ag + /Ag): 0.799 V], small energy level gaps and favorable electron transfer rate, 37 which made them exhibit excellent activities in diverse elds. 37,54,[57][58][59][60][61] This in turn explained why Ag nanoparticles demonstrated a superior electrochemical performance to other metal particles (Ni, Fe, Cu, Co, Zn, and Al, Fig. S1 †) to some extent.…”

“…22 Currently, electrochemical detection has been combined with paper-based platforms following the strategies of printing, [23][24][25][26] evaporation and sputtering, 27,28 electrodeposition, 29 pencil-drawing, 30,31 drop-casting deposition, 32,33 pyrolysis, 22,34 and vacuum-ltration. [35][36][37] In contrast to other strategies, vacuum ltration is a relatively simple, time-saving, and scalable method for fabricating paper electrodes in electrochemical detection. Various paper substrates, including Ni-Au composite/carbon nanotubes/polyvinyl alcohol, 36 Ni-metalorganic framework composite/Au nanoparticles/carbon nanotubes, 36 MoS 2 /reduced graphene oxide, 35 Ag nanoparticles/ reduced graphene oxide, 37 and reduced graphene oxide/Ag nanoparticles/poly(pyronine Y), 38 have been fabricated and demonstrate excellent analytical performance for target compounds.…”

“…[35][36][37] In contrast to other strategies, vacuum ltration is a relatively simple, time-saving, and scalable method for fabricating paper electrodes in electrochemical detection. Various paper substrates, including Ni-Au composite/carbon nanotubes/polyvinyl alcohol, 36 Ni-metalorganic framework composite/Au nanoparticles/carbon nanotubes, 36 MoS 2 /reduced graphene oxide, 35 Ag nanoparticles/ reduced graphene oxide, 37 and reduced graphene oxide/Ag nanoparticles/poly(pyronine Y), 38 have been fabricated and demonstrate excellent analytical performance for target compounds. Despite this, paper electrodes were mainly prepared by coating different composites on the surface of organic lter membranes, followed by peeling them off for electrochemical detection.…”