Enhanced electron transfer mediated detection of hydrogen peroxide using a silver nanoparticle-reduced graphene oxide-polyaniline fabricated electrochemical sensor.

Autor: Kumar V; Nanomaterial Research Laboratory, Department of Chemistry, Indian Institute of Technology (BHU) Varanasi-221005 U.P. India vijuevs@gmail.com +91-542-6702861 +91 9839089919., Gupta RK; Fuel Cell Technology, Department of Chemistry, Indian Institute of Technology (BHU) Varanasi-221005 U.P. India shhasan.apc@itbhu.ac.in., Gundampati RK; Department of Chemistry and Biochemistry, University of Arkansas Fayetteville Arkansas-72701 USA., Singh DK; Nanomaterial Research Laboratory, Department of Chemistry, Indian Institute of Technology (BHU) Varanasi-221005 U.P. India vijuevs@gmail.com +91-542-6702861 +91 9839089919., Mohan S; Nanomaterial Research Laboratory, Department of Chemistry, Indian Institute of Technology (BHU) Varanasi-221005 U.P. India vijuevs@gmail.com +91-542-6702861 +91 9839089919., Hasan SH; Fuel Cell Technology, Department of Chemistry, Indian Institute of Technology (BHU) Varanasi-221005 U.P. India shhasan.apc@itbhu.ac.in., Malviya M; Fuel Cell Technology, Department of Chemistry, Indian Institute of Technology (BHU) Varanasi-221005 U.P. India shhasan.apc@itbhu.ac.in.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2018 Jan 04; Vol. 8 (2), pp. 619-631. Date of Electronic Publication: 2018 Jan 04 (Print Publication: 2018).
DOI: 10.1039/c7ra11466d
Abstrakt: The current study aims at the development of an electrochemical sensor based on a silver nanoparticle-reduced graphene oxide-polyaniline (AgNPs-rGO-PANI) nanocomposite for the sensitive and selective detection of hydrogen peroxide (H 2 O 2 ). The nanocomposite was fabricated by simple in situ synthesis of PANI at the surface of rGO sheet which was followed by stirring with AEC biosynthesized AgNPs to form a nanocomposite. The AgNPs, GO, rGO, PANI, rGO-PANI, and AgNPs-rGO-PANI nanocomposite and their interaction were studied by UV-vis, FTIR, XRD, SEM, EDX and XPS analysis. AgNPs-rGO-PANI nanocomposite was loaded (0.5 mg cm -2 ) on a glassy carbon electrode (GCE) where the active surface area was maintained at 0.2 cm 2 for investigation of the electrochemical properties. It was found that AgNPs-rGO-PANI-GCE had high sensitivity towards the reduction of H 2 O 2 than AgNPs-rGO which occurred at -0.4 V vs. SCE due to the presence of PANI (AgNPs have direct electronic interaction with N atom of the PANI backbone) which enhanced the rate of transfer of electron during the electrochemical reduction of H 2 O 2 . The calibration plots of H 2 O 2 electrochemical detection was established in the range of 0.01 μM to 1000 μM ( R 2 = 0.99) with a detection limit of 50 nM, the response time of about 5 s at a signal-to-noise ratio (S/N = 3). The sensitivity was calculated as 14.7 μA mM -1 cm -2 which indicated a significant potential as a non-enzymatic H 2 O 2 sensor.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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