Lateral field excited quartz crystal microbalances for biosensing applications

Area of Science:

• Materials Science
• Analytical Chemistry
• Biophysics

Background:

• Quartz crystal microbalance (QCM) is a common biosensing tool, but its sensitivity is limited by mechanical property detection.
• Electrical property detection in QCM is restricted by electrode placement on the sensing surface.

Purpose of the Study:

• To present the theoretical and experimental aspects of the lateral field excited QCM (LFE-QCM).
• To demonstrate the enhanced sensitivity of LFE-QCMs for detecting both mechanical and electrical property changes in biosensing applications.

Main Methods:

• Development and theoretical analysis of LFE-QCMs with electrodes on a single quartz plate face.
• Experimental setup design for measuring LFE-QCM responses.
• Attachment of target-capture films for biomarker detection.

Main Results:

• LFE-QCMs exhibit significantly higher sensitivity to both electrical and mechanical property changes compared to traditional QCMs.
• New LFE-QCM modes were identified, dependent on the electrical properties of the sensing environment.
• Successful detection of liquid properties, chemical targets, and biological targets using LFE-QCMs.

Conclusions:

• LFE-QCMs represent a significant advancement in acoustic wave biosensing technology.
• The ability to detect electrical and mechanical properties enhances detection capabilities for various analytes.
• LFE-QCMs show promise for sensitive detection of disease biomarkers, such as those for cancer.