Bulk and Surface Acoustic Wave Sensor Arrays for Multi-Analyte Detection: A Review

Area of Science:

• Acoustic wave sensing technology
• Sensor array design
• Analytical chemistry

Background:

• Bulk acoustic wave (BAW) and surface acoustic wave (SAW) sensors are established for gas, liquid, and biosensing.
• Analyte specificity relies on sensor coatings, which can be non-selective.
• Multi-analyte detection often requires multiple sensors or advanced signal processing.

Purpose of the Study:

• To review the principles and design considerations of acoustic multi-sensor and virtual sensor arrays.
• To outline the application of these arrays in multi-analyte detection.
• To focus on advancements in acoustic sensor arrays over the past decade.

Main Methods:

• Discussion of BAW and SAW sensor principles (thickness shear, Rayleigh, HPSW modes).
• Exploration of multi-sensor array configurations.
• Examination of virtual sensor array concepts with enhanced signal evaluation or sample separation.
• Review of sensor coating strategies for analyte selectivity.

Main Results:

• Multi-sensor arrays provide qualitative and quantitative sample characterization through signal pattern analysis.
• Virtual sensor arrays achieve comparable results to multi-sensor arrays with single-sensor systems.
• Both array types demonstrate promise for system integration and cost reduction.
• Recent developments focus on improving selectivity and detection capabilities.

Conclusions:

• Acoustic sensor arrays, both multi-sensor and virtual, are effective for multi-analyte detection.
• These technologies offer a promising pathway for integrated, low-cost sensing solutions.
• Continued research focuses on enhancing selectivity and expanding application scope.