Fabrication of New Magnetic Nanoparticles (Fe₃O₄) Grafted Multiwall Carbon Nanotubes and Heterocyclic Compound Modified Electrode for Electrochemical Sensor

Abstract

Magnetic Fe 3 O 4 nanoparticles functionalized multiwalled carbon nanotubes (nano-Fe 3 O 4 MWNTs) were prepared for electrochemical sensors. 2-amino-5-mercapto-1,3,4-thiadiazole was used as a connecter to form a network that connected nano-Fe 3 O 4 MWNTs to the Au electrode surface. Modified process of the electrode was studied with SEM, TEM and cyclic voltammetry. Cyclic voltammetry and amperometric i-t curve were used to investigate characteristics of the obtained electrode. The sensor has been successfully used on the direct detection of catechol and showed excellent performances. The linear regression equation was I pa (mA) ¼ 0.07763 þ 0.16739 C (mmol/L); R ¼ 0.9993 and the detection limit was 5.38 Â 10 À8 mol/L. The modified electrode showed good reproducibility and stability.

Enhanced Electrochemical Sensing with Carbon Nanotubes Modified with Bismuth and Magnetic Nanoparticles in a Lab‐on‐a‐Chip

“…[27][28][29] Detection of catechol using magnetic nanoparticles (Fe 3 O 4 )g rafted onto multiwall CNTsh as also been reported. [29] Someo ft he reported work described that the addition of magnetic nanoparticles to the CNTsm ade the CNTsm agnetized. [30,31] Another interesting application showeds ilver nanoparticles cross-stackedw ithC NTs to form sheets that acted as an excellent cathode in af ibershaped aluminumair battery.…”

“…Carbon‐coated iron nanoparticles have been used with direct electrochemistry of hemoglobin for amperometric detection of hydrogen peroxide . Other work on modified CNTs reported an amperometric glucose biosensor based on multiwalled CNTs with SiO 2 ‐coated Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 @SiO 2 /MWNTs) and a glucose sensor based on Pt‐nanoparticle‐decorated iron oxide multiwall CNTs (Fe y O x ‐MWCNTs) magnetic composite . Detection of catechol using magnetic nanoparticles (Fe 3 O 4 ) grafted onto multiwall CNTs has also been reported .…”

“…Other work on modified CNTs reported an amperometric glucose biosensor based on multiwalled CNTs with SiO 2 ‐coated Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 @SiO 2 /MWNTs) and a glucose sensor based on Pt‐nanoparticle‐decorated iron oxide multiwall CNTs (Fe y O x ‐MWCNTs) magnetic composite . Detection of catechol using magnetic nanoparticles (Fe 3 O 4 ) grafted onto multiwall CNTs has also been reported . Some of the reported work described that the addition of magnetic nanoparticles to the CNTs made the CNTs magnetized .…”

Modifikacija elektrokemijskih senzora nanočesticama metalnih oksida

“…Slično kao i kod Fe 2 O 3 , i Fe 3 O 4 nanočestice se kombiniraju s MWCNTs-om i to za određivanje katehola, što su predstavili Huang i sur. 36 Najveći broj radova koji predstavljaju modifikaciju elektrokemijskih senzora nanočesticama magnetita odnosi se na voltametrijske metode. Potenciometrijske metode su najrjeđe zastupljene te su takva istraživanja predstavili Khun i sur.…”