Direct voltammetry and electrocatalytic properties of hemoglobin immobilized on a glassy carbon electrode modified with nickel oxide nanoparticles

Probing the electrochemical behaviour of SWCNT–cobalt nanoparticles and their electrocatalytic activities towards the detection of nitrite at acidic and physiological pH conditions

“…About 20 L drop of the SWCNTs/DMF solution (7 mg acidified SWCNTs in 1 mL DMF) was dropped on the bare EPPGE and dried in an oven at 50 • C for about 2 min. Cobalt nanoparticles were electrodeposited onto the EPPGE-SWCNT (herein abbreviated as EPPGE-SWCNT-Co) using chronoamperometry technique in 5 mM Co(NO 3 ) 2 ·6H 2 O solution at a fixed potential of −2.0 V for 5 min, a similar procedures adopted by others for the deposition of metal particles on electrodes [51][52][53][54]. The EPPGE-SWCNT-CoO electrode was obtained by immersing the EPPGE-SWCNT-Co in 0.1 M PBS (pH 7.0) and repetitively scanning (20 scans) between 1.5 and −0.8 V potential window at a scan rate of 100 mV s −1 [52,53].…”

A sensitive nonenzymatic hydrogen peroxide sensor using cadmium oxide nanoparticles/multiwall carbon nanotube modified glassy carbon electrode

“…In this work, CdO shows better sensitivity than other metal oxide ( Table 1). The linear range of the CdO-MWCNT modified electrode is also comparable with electrodes modified with metal or metal oxide nanoparticles [10][11][12][13][14][15][16][17][18][19][20][21][22].…”

“…Nanoscale metal oxides are a very promising class of electrocatalysts because they are active, inexpensive and thermodynamically stable [9]. To date, different metal oxide particles and nanoparticles such as copper oxide [10] zirconium oxide [11], ruthenium oxide [12], cobalt oxide [13,14], iron oxide [15,16] and nickel oxide [17][18][19], manganese oxide [20], titanium oxide [21] and zinc oxide [22] have been successfully used for sensing H 2 O 2 . Nanoscale CdO with different morphologies has been synthesized [23][24][25] and this oxide is known to possess high electrical conductivity, high carrier concentration and high transparency in the visible range of the electromagnetic spectrum [26].…”

Direct Electron Transfer of Glucose Oxidase and Glucose Biosensor Based on Nano‐structural Attapulgite Clay Matrix

“…However, there are three main factors to block the direct electron transfer between the enzyme and solid electrode: (i) deeply buried active center of enzyme, (ii) change of enzyme conformation due to adsorption on electrode surface, and (iii) improper orientation of the adsorbed enzyme on electrode surface. 7,8 Recently, many attempts have been made to improve the direct electron transfer between the heme protein [9][10][11] or flavin enzyme [12][13][14][15] and the electrode to obtain the biosensor with good performance.…”