CPOS Seminar: "Characterizing Single Particles and Biosensors via Electrochemical Impedance"

Speaker: BRIAN ROEHRICH, GraduateStudent Researcher, Chemistry and Biochemistry Deparment, UCSB

Abstract: Electrochemical impedance spectroscopy (EIS) is a powerful technique in the characterization of complex electrochemical systems. By applying sinusoidal voltages of varying frequencies and recording the current response, slower diffusion and adsorption processes can be readily distinguished from fast electron transfers and capacitive charging. This provides a complete picture of the electrochemical circuit, however, a significant limitation is the long duration of typical EIS experiments. Fortunately, fast Fourier transform - EIS (FFT-EIS) is able to decrease measurement times to seconds or less, enabling time-resolved measurements of full impedance spectra. In this presentation, I will describe how we have leveraged FFT-EIS’s rapid measurements in two areas: measurements on individual particles and as a new interrogation technique for electrochemical aptamer-based biosensors.