Ultrasensitive voltammetric and impedimetric aptasensor for diazinon pesticide detection by VS2 quantum dots-graphene nanoplatelets/carboxylated multiwalled carbon nanotubes as a new group nanocomposite for signal enrichment

Recent advances in silver nanoparticle-based electrochemical sensors for determining organic pollutants in water: a review

“…Similarity, chronoamperometry was studied as both an analyte-and a modifier-based electrochemical technique using AgNPs modifiers [128][129] . In impedimetric sensors, the concentration of the analyte in solution is determined by measuring the number of bound molecules on the receptors immobilized on the electrode surface, which lead to increased resistance accompanied by an amplification signal or decreased resistance accompanied by an inhibition signal, depending on the chemistry of the targeted analyte 117,[130][131] . AgNPs could be incorporated into the electrode surface to increase the electron transport 132 .…”

Development of Electrochemical Aptasensor for Lung Cancer Diagnostics in Human Blood

“…Electrochemical aptasensors are becoming popular in sensing a wide range of different analytes, from cells [ 1 ] and microorganisms [ 2 ], to small molecule biomarkers [ 3 , 4 , 5 ] and metal ions [ 6 , 7 , 8 ] in body fluids (serum [ 9 , 10 ], urine [ 11 ], and saliva [ 12 ]), food [ 13 , 14 , 15 ], and water [ 16 , 17 ]. When increasing the sensitivity and other analytical characteristics of electrochemical aptasensors, a tendency to complicate their composition and structure is observed.…”

Ratiometric Dual Signal-Enhancing-Based Electrochemical Biosensor for Ultrasensitive Kanamycin Detection

“…Generally, two-dimensional (2D) nanomaterials are suitable for immobilization on the electrode surface of the electrochemical biosensor due to their unique physical and chemical features, including MoS 2 , Mo 2 C, and vanadium disulfide (VS 2 ). , VS 2 , a typical transition-metal dichalcogenides (TMDs), presents a metallic electronic ground state; hence, triple-layered stacking 2D VS 2 nanosheets exhibit superior conductivity, large specific surface area, and superior mechanical properties. − Moreover, to improve the biocompatibility, gold nanoparticles (AuNPs) are applied in biosensors due to their superior biocompatibility, large surface area, and remarkable conductivity . Therefore, VS 2 nanosheets (NS) and AuNPs could be effectively combined to immobilize more probes and accelerate electron transfer easier . Thus, the VS 2 /AuNPs nanocomposites on the modified electrode will enhance the biosensor signal greatly by increasing the charge transfer rate and efficiently retaining the biomolecule activities.…”

“…19 Therefore, VS 2 nanosheets (NS) and AuNPs could be effectively combined to immobilize more probes and accelerate electron transfer easier. 20 Thus, the VS 2 /AuNPs nanocomposites on the modified electrode will enhance the biosensor signal greatly by increasing the charge transfer rate and efficiently retaining the biomolecule activities. Numerous signal amplification strategies including hybridization chain reaction (HCR), rolling circle amplification (RCA), and catalytic hairpin assembly (CHA) have been developed for biosensor components.…”