Single-stranded DNA-based Immobilization of Ag Nanoparticles for Enzymeless H2O2 Detection

Title:Single-stranded DNA-based Immobilization of Ag Nanoparticles for Enzymeless H2O2 Detection

Volume: 8 Issue: 2

Author(s): Guohui Chang, Yonglan Luo, Wenbo Lu, Xiaoyun Qin, Fang Liao, Abdullah M. Asiri, Abdulrahman O. Al-Youbi and Xuping Sun

Affiliation:

Keywords: Immobilization, thiolated single-stranded DNA, Ag nanoparticle, enzymeless H2O2 detection

Abstract: In this communication, we report a new method for effective immobilization of Ag nanoparticles (AgNPs) on thiolated singlestranded DNA (thiol-ssDNA) modified Au electrode (AuE) surface via coordination interactions between the nitrogen atoms of DNA bases and AgNPs. It suggests that the AgNP-immobilized AuE exhibits notable catalytic performance for H2O2 reduction and the loading of AgNPs on the AuE surface and therefore the effective catalytic area can be tuned by the immobilization time of thiol-ssDNA and adsorption time of AgNPs. This H2O2 sensor has a fast amperometric response time of less than 3 s and its linear range and detection limit are estimated to be from 0.1 mM to 160 mM (r = 0.995) and 0.8 μM at a signal-to-noise ratio of 3, respectively.

Cite this article as:

Chang Guohui, Luo Yonglan, Lu Wenbo, Qin Xiaoyun, Liao Fang, M. Asiri Abdullah, O. Al-Youbi Abdulrahman and Sun Xuping, Single-stranded DNA-based Immobilization of Ag Nanoparticles for Enzymeless H2O2 Detection, Current Nanoscience 2012; 8 (2) . https://dx.doi.org/10.2174/157341312800167740