CdTe nanorods for nonenzymatic hydrogen peroxide biosensor and optical limiting applications
M. Manikandan, C. Revathi, P. Senthilkumar, S. Amreetha, S. Dhanuskodi, R. T. Rajendra Kumar
Cadmium telluride nanorods (CdTe NRs) have been prepared by the hydrothermal method using ascorbic acid and characterized by x-ray photoelectron spectroscopy, linear and nonlinear optical properties, magnetic properties, and electrochemical analysis. The temperature-dependent magnetic study shows the ferromagnetic behavior. Modified CdTe NRs/glassy carbon electrode was used as the hydrogen peroxide (H2O2) biosensor. It exhibits a linear range (0.67–8.04 μM) with good sensitivity (1326 μA mM−1 cm−2), detection limit (0.1 μM), and a rapid amperometric response time (5 s). It displays a high selectivity toward H2O2 and interference-free phenomenon for other electroactive species such as ascorbic and oxalic acids. The sensor has good selectivity, stability, and reproducibility. CdTe NRs show a better optical limiting property under laser excitation (532 nm, 9 ns) with the two-photon absorption (TPA) coefficient of 12.0 × 10−10 m/W at 100 μJ and an optical limiting of 1.60 J/cm2. These results indicated that the prepared materials could be promising for the detection of hydrogen peroxide and for use as memory storage devices and optical limiters.
Absorption, Fluorescence, Nanostructures, Materials, Optical properties