Wireless Sensor Array System for Combinatorial Screening of Sensor Materials
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Wireless Sensor Array System for Combinatorial Screening of Sensor Materials William G. Morris1 and Radislav A. Potyrailo2* 1 Combinatorial Chemistry Laboratory and 2Chemical and Biological Sensing Laboratory, Materials Analysis and Chemical Sciences, General Electric Company, Global Research Center, Niskayuna, NY 12309, USA; * Corresponding author: [email protected] ABSTRACT Screening of materials arrays for their viscoelastic, gas-sorbing, and electrical properties is important for a variety of practical applications ranging from sensor to protective coatings. Complex impedance analysis of the materials arrays is an attractive approach to analyze these materials properties. We developed a wireless proximity sensor array system for combinatorial screening of these types of materials and demonstrated its applicability for sensor materials. In the developed system, sensor materials are applied onto an array of resonators and arranged for performance testing in a test chamber. Each resonator is coupled to a receiver antenna. An array of these antennas is read with a single scanning transmitter antenna or an array of transmitter antennas. Such a high-throughput screening approach of sensor materials permits their evaluation in complex environments where additional wiring is not desirable or creates a prohibitively complex design. INTRODUCTION Noncontact sensing is attractive for a variety of applications ranging from wireless sensors for chemical and biological detection [1-4] to measurements of physical parameters [5], and medical monitoring [6]. Noncontact, proximity monitoring is also useful for combinatorial screening of performance properties of sensor materials arrays. The multidimensional nature of the interactions between function, composition, preparation method, and end-use conditions of sensor materials often makes their rational design for real-world applications difficult [7-12]. These practical challenges in rational sensor material design provide tremendous potential for combinatorial and high-throughput research [13]. In this report, we demonstrate the concept and an initial experimental demonstration of a wireless proximity sensor system for combinatorial screening of sensor materials. In the developed system, sensor materials are applied onto an array of resonators and arranged for performance testing in a test chamber. Each resonator is coupled to a transmitter antenna. An array of these antennas is read with a single scanning pickup antenna or an array of pickup antennas. Such a high-throughput screening approach of sensor materials permits their evaluation in complex environments where additional wiring is not desirable or adds a prohibitively complex design.
OPERATIONAL CONCEPT A complete evaluation of a complex impedance of a sensor material for resonant sensors is typically performed with a network or impedance analyzer. The real ZRE and imaginary ZIM
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parts of the complex impedance of the sensor device are further related to the analyte-sorbing, viscoelastic
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