A novel hydrogen peroxide sensor based on Ag nanoparticles decorated polyaniline/graphene composites

Abstract

A novel electrochemical sensor based on Ag nanoparticles (AgNPs) decorated polyaniline/graphene composites (PANI/G) is developed, which can be used for sensitive determination of H 2 O 2 . For the construction of the H 2 O 2 sensor, polyaniline (PANI) is first electrodeposited on the surface of graphene (G) to form PANI/G, and then horseradish peroxidase (HRP) loaded on AgNPs (HRP/AgNPs) is immobilized on to the PANI/G. H 2 O 2 can be catalyzed by HRP to generate current response which can be significantly enhanced by AgNPs, and thus the PANI/G based sensor can be utilized for the detection of H 2 O 2 . Under the optimized conditions, the proposed H 2 O 2 sensor exhibits wide linear response to H 2 O 2 concentration ranging from 0.25 to 2.25 mM with a detection limit of 0.03 mM (signal-to-noise ratio of 3), and it also shows high selectivity and reproducibility. The method is simple and costeffective, and can be a promising candidate as the sensitive sensing platform for H 2 O 2 .

Novel amperometric glucose biosensor based on MXene nanocomposite

“…The superior sensing performance of GOx/Au/MXene/Nafion/GCE is attributed to the improvement in the relative activity of GOx in the presence of Au nanoparticles. It has been widely reported that the biosensing properties of graphene-based sensors can be dramatically improved by anchoring Au nanoparticles on the surface of graphene nanosheets5354555657. In a similar way, dispersion of Au nanoparticles on the surface of MXene nanosheets is expected to improve the electrical conductivity and makes the resultant Au/MXene composite as a better electrochemical transducer/enzyme immobilization matrix.…”

Non‐Enzymatic Amperometric Detection of H2O2 on One‐Step Electrochemical Fabricated Cu2O/Electrochemically Reduced Graphene Oxide Nanocomposite

“…The performance of the previously reported studies for H 2 O 2 was disclosed (Table1). Comparing with various non‐enzymatic H 2 O 2 sensors in Table1, the Cu 2 O/ERGO nanocomposites possessed desirable detection limit and a wide linear response range (0.001–1.0 mM) at applied potential of −0.25 V . As can be seen in Table , the Cu 2 O/ERGO nanocomposite‐modified electrode can be preferred for amperometric detection of H 2 O 2 with low LOD.…”

A facile synthesis of novel polyaniline/graphene nanocomposite thin films for enzyme-free electrochemical sensing of hydrogen peroxide

“…17,18 Graphene derivatives such as graphene oxide and reduced graphene oxide and their nanocomposites have also been extensively studied for various electronic and environmental applications. 2,18–22 However, the processability conditions for the direct use of pure graphene sheets are challenging due to their hydrophobic character. 23 Therefore, efficient strategies are needed to utilize graphene in its natural form and without any chemical modification.…”

“…For example, a GCE modified with a Ag nanoparticle-decorated polyaniline/graphene composite showed promising sensing activity against H 2 O 2 with a detection limit of 0.03 mM in 0.1 M PBS at pH 7.0. 19 Similarly, a Pt nanoparticle ensemble on a PANI/G composite was drop-cast on a GCE and used for H 2 O 2 sensing in 0.1 M PBS and exhibited a detection limit of 50 nM. 25 Due to the effectiveness of the process and the low detection limits, the research on graphene-based electrochemical sensors for H 2 O 2 sensing is open for new strategies.…”