Related Experiment Video
Updated: Jul 26, 2025

Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems
Published on: July 4, 2011
GHz ultrasonic sensor for ionic content with high sensitivity and localization
Priya S Balasubramanian1, Amit Lal1
1School of Electrical and Computer Engineering, Cornell University, Ithaca, NY 14853, USA.
Abstract:
Sensing the ionic content of a solution at high spatial and temporal resolution and sensitivity is a challenge in nanosensing. This paper describes a comprehensive investigation of the possibility of GHz ultrasound acoustic impedance sensors to sense the content of an ionic aqueous medium. At the 1.55 GHz ultrasonic frequency used in this study, the micron-scale wavelength and the decay lengths in liquid result in a highly localized sense volume with the added potential for high temporal resolution and sensitivity. The amplitude of the back reflected pulse is related to the acoustic impedance of the medium and a function of ionic species concentration of the KCl, NaCl, and CaCl2 solutions used in this study. A concentration sensitivity as high as 1 mM and concentration detection range of 0 to 3 M was achieved. These bulk acoustic wave pulse-echo acoustic impedance sensors can also be used to record dynamic ionic flux.
Related Concept Videos
Mass Analyzers: Common Types
High-Resolution Mass Spectrometry (HRMS)
High-Performance Liquid Chromatography: Types of Detectors

