Enhanced electrochemiluminescence sensing platform using nitrogen-doped graphene as a novel two-dimensional mat of silver nanoparticles

Microwave‐assisted Synthesis of Pd Oxide‐rich Pd Particles on Nitrogen/Sulfur Co‐Doped Graphene with Remarkably Enhanced Ethanol Electrooxidation

“…As shown in Figure A, the high‐resolution spectrum of N 1s in NS‐rGO could be fitted by two peaks as for pyridine‐like N (398.7 eV) and pyrrole‐like N (400.8 eV) species . Pyridinic N bonds with two sp 2 carbon atoms at the defects or edges of graphene can provide the π ‐system with one p electron, while pyrrolic N bonds with three sp 2 C atoms can contribute two p electron to the π ‐system, changing the valence band structure of graphene . The high‐resolution of S 2p peak could be fitted with three different sulfur moieties (Figure B).…”

Nitrogen-Doped Graphene Quantum Dots@SiO2 Nanoparticles as Electrochemiluminescence and Fluorescence Signal Indicators for Magnetically Controlled Aptasensor with Dual Detection Channels

“…The peak around −1.0 V for both electrodes was attributed to the reduction of S 2 O 8 2– to anion sulfate radical SO 4 •– . The reduction peak potential of S 2 O 8 2– at MB-aptamer/cDNA-NGQDs@SiO 2 modified mGCE was more positive for ∼210 mV and exhibited higher reduction peak current than that of MB-aptamer modified mGCE, attributing to the excellent electrocatalytic activity of NGQDs with doped nitrogen. , An additional peak located at −1.72 V could be assigned to the electrochemical reduction of the attached NGQDs on the electrode surface, , which produced negatively charged radicals of NGQDs •– . The strongly oxidizing SO 4 •– resultants were then reacted with NGQDs •– via electron-transfer annihilation to generate an excited state (NGQDs*) that finally produced an ECL emission. , When the dissolved oxygen was removed from the electrolyte solution, the ECL intensity was a bit lower than that measured in the air-saturated solution (Supporting Information Figure S5).…”

“…The strongly oxidizing SO 4 •– resultants were then reacted with NGQDs •– via electron-transfer annihilation to generate an excited state (NGQDs*) that finally produced an ECL emission. , When the dissolved oxygen was removed from the electrolyte solution, the ECL intensity was a bit lower than that measured in the air-saturated solution (Supporting Information Figure S5). That is because the dissolved oxygen can be reduced to OOH – upon the potential scan with an initial negative direction and the resulting OOH – could react with NGQDs •– to produce light-emitting species NGQDs* . Hence, the ECL emission of NGQDs@SiO 2 in an air-saturated buffer containing S 2 O 8 2– can be expressed as follows: …”

“…59 The reduction peak potential of S 2 O 8 2− at MB-aptamer/cDNA-NGQDs@SiO 2 modified mGCE was more positive for ∼210 mV and exhibited higher reduction peak current than that of MB-aptamer modified mGCE, attributing to the excellent electrocatalytic activity of NGQDs with doped nitrogen. 54,60 An additional peak located at −1.72 V could be assigned to the electrochemical reduction of the attached NGQDs on the electrode surface, 52,59 which produced negatively charged radicals of NGQDs •− . The strongly oxidizing SO 4…”

Recent Advances in Electrochemiluminescence Analysis

“…In addition, functional nanomaterials cannot only produce a synergic effect among catalytic activity, conductivity, and biocompatibility to accelerate the signal transduction but also amplify recognition events with specifically designed signal tags, leading to highly sensitive biosensing . So far different kinds of nanomateirals have been used for ECL signal amplification, such as graphene sheets, − carbon nanotubes, − and metal nanomaterials. ,− Catalytic reactions are also widely used to amplify ECL by using enzyme, enzyme mimics, or nanocatalyst signals, such as horseradish peroxidase (HRP), − and DNAzyme. ,− Despite these burgeoning developments, there is still high demand for the development of highly sensitive ECL platforms. Novel signal amplification strategies are springing up and have now become the main driving force of innovation for ECL assays.…”