Optical sensing of H_2O_2 based on red-shift of emission wavelength of carbon quantum dots

Abstract

In this paper, the multicolor photoluminescence carbon quantum dots (CQDs) have been synthesized by one step hydrothermal method to analyze hydrogen peroxide (H2O2). These CQDs exhibited multicolor emission under a single wavelength excitation for the quantification of H2O2. Using an LED with a central wavelength of 365 nm as the excitation source, it is shown that the red emission CQDs capable of detecting H2O2 over the linear range of 0-88.2 mM and the H2O2 sensitivity of wavelength shift to changes in the H2O2 concentration was found to be 0.18 nm/mM. These results of the optical sensing method can be used in practice detection of H2O2 and could offer a new approach for developing a new 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.