Hydrogen peroxide sensing based on carbon quantum dots

Ming Chi University of Technology, 24301 New Taipei City, Taiwan

Abstract

In this work, carbon quantum dots (CQD_s) have been synthesized by one step hydrothermal method to detect hydrogen peroxide (H₂O₂). The optical H₂O₂ sensors were based on the fluorescent quenching of the carbon quantum dots. The optical H₂O₂ sensors demonstrate capable of detecting H₂O₂ over the range of 0-88.2 mM and 0-60 mM. The H₂O₂ sensitivities of wavelength shift to changes in the H₂O₂ concentration were found to be 0.18 nm/mM and 0.26 nm/mM. These results of the optical sensors showed that the method can be used in practice detection of H₂O₂ and could offer a new approach for developing a new optical biosensor. The CQDs exhibit good emission property and high stability, as well as excitation-independent emission behavior. Moreover, it is attractive that CQDs can be used as an effective fluorescent probe for the detection of H₂O₂ with linear Stern-Volmer plot and wavelength shift in an aqueous solution.