Posts

Design and Validation of a 150 MHz HFFQCM Sensor for Bio-Sensing Applications

Authors: Román Fernández1, Pablo García1, María García1, José V. García1, Yolanda Jiménez2 and Antonio Arnau2

1Advanced Wave Sensors S. L., Algepser 24, 46988 Paterna, Spain
2Centro de Investigación e Innovación en Bioingeniería, Universitat Politècnica de València, Camí de Vera S/N, 46022 Valencia, Spain

Journal: Sensors Journal (2017)

Abstract: Acoustic wave resonators have become suitable devices for a broad range of sensing applications due to their sensitivity, low cost, and integration capability, which are all factors that meet the requirements for the resonators to be used as sensing elements for portable point of care (PoC) platforms. In this work, the design, characterization, and validation of a 150 MHz high fundamental frequency quartz crystal microbalance (HFF-QCM) sensor for bio-sensing applications are introduced. Finite element method (FEM) simulations of the proposed design are in good agreement with the electrical characterization of the manufactured resonators. The sensor is also validated for bio-sensing applications. For this purpose, a specific sensor cell was designed and manufactured that addresses the critical requirements associated with this type of sensor and application. Due to the small sensing area and the sensor’s fragility, these requirements include a low-volume flow chamber in the nanoliter range, and a system approach that provides the appropriate pressure control for assuring liquid confinement while maintaining the integrity of the sensor with a good base line stability and easy sensor replacement. The sensor characteristics make it suitable for consideration as the elemental part of a sensor matrix in a multichannel platform for point of care applications.

Keywords: HFF-QCM (high fundamental frequency quartz crystal microbalance); finite element method (FEM); flow cell; biosensor; PoC (point of care); MQCM (monolithic quartz crystal microbalance)

 Sensors 17 02057 g002 550

You can download the full paper here

Comparison between High Fundamental Frequency Quartz Crystal Microbalance and Love Mode Surface Acoustic Wave devices in the detection of Carbaryl pesticide

Authors: J.V. García, M.I. Rocha, C. March, P. García, L.A. Francis, A. Montoya, A. Arnau, Y. Jiménez

Event: Acoustic Sensors in analytical and Biophysical Studies, 29-30 August 2013, IMBB-FORTH, Heraklion, Crete.

 

In this work two acoustic technologies: High Fundamental Frequency Quartz Crystal Microbalance (HFF-QCM) and Love Mode Surface Acoustic Wave (LM-SAW) have been compared for the detection of Low Molecular Weight (LMW) compounds in terms of Sensitivity and LOD. The results have also been compared with those obtained with other techniques: Traditional QCM, Surface Plasmon Resonance (SPR) and Enzyme-Linked ImmunoSorbent Assay (ELISA). Carbaryl pesticide was chosen as model analyte because it had been used as a reference LMW compound by those mentioned techniques.

AWS-A10 research platform (AWSensors, Spain) was used to perform the experiments. This platform allowed for a comparison of both devices measured by the same characterization system under similar experimental conditions.

The results achieved with LM-SAW and 100Mhz HFF-QCM were in the same order of magnitude. The achieved value sensitivity (I50 value) and LOD (I90 ) were around 0.31 µ/L and 0.09 µ/L, respectively, for LM-SAW device, and around 0’66 µ/L and 0’14 µ/L, respectively, for HFF-QCM device. Sensitivities and LODs with these novel developments on acoustic technologies improve SPR and traditional QCM technologies, and approach ELISA’s ones.

Review the poster about this experiment by clicking here:

Póster about AWS-HFF sensors for detection of Carbaryl pesticide showed at Crete 2013