ChemiBlock transducers

Abstract

The first chemical gas transducers that employ NanoBlock ® substrates are described. The sensing material, a carbon black/polymer composite, is deposited onto pre-patterned silicon wafers. Subsequent processing steps yield transducers with a small form factor (1.05 mm × 1.05 mm). These so termed "ChemiBlocks" exhibit response times t 90 < 3 s and recovery times t 10 < 15 s when exposed to the nerve gas simulant dimethyl methylphosphonate. Although only one composite composition is employed in this study, the extension to array-based differentiation of target analytes and interferents is anticipated to be straightforward given the maturity of C-black/polymer composite sensor technology. ChemiBlock transducers are well suited for application in radio-frequency microsensor systems that are currently under development.

Materials and Transducers Toward Selective Wireless Gas Sensing

“…201 Wireless vapor sensors based on conducting polymer composites have been demonstrated based on both passive and battery-operated designs. 210–212 Several reviews provide details of developments in conducting polymer composites. 100,213 …”

“…Chemiresistor arrays with conducting polymer composites were commercialized by Cyrano Sciences . Wireless vapor sensors based on conducting polymer composites have been demonstrated based on both passive and battery-operated designs. − Several reviews provide details of developments in conducting polymer composites. , …”

Enhanced Radio Frequency Biosensor for Food Quality Detection Using Functionalized Carbon Nanofillers

“…A step forward in real time and remote monitoring of gas composition in an environment was accomplished with the implementation of biosensors and electronic noses on radio frequency identification (RFID) transponders. − However, the previously developed methods suffer from either high power consumption, or resulting devices with low coding capacity, − which hinder the large scale implementation due to the short lifetime of the device or due to the signal confusion in the case of simultaneous interrogation of multiple devices, respectively. In a simpler approach, truly passive RFID sensors with high coding capacity were fabricated by coating a material on the transponder antenna and during exposure to an analyte, with the change in dielectric or electrical properties of the coating affects the signal collected by the RFID reader. − The identification of the analyte is performed by exploiting the reflected signal characteristics and by using pattern recognition techniques.…”

Multianalyte Chemical Identification and Quantitation Using a Single Radio Frequency Identification Sensor

“…15,16 RFID sensors for chemical and biological species are also under development. [16][17][18] Unfortunately, the most prominent limitations of reported RFID and other wireless chemical, biological, and physical sensors are difficulties in accurate measurements in presence of interferences, difficulties in quantitation of multiple parameters with a single sensor, and the need for costly development of dedicated transducers for sensing. [16][17][18][19][20][21][22][23][24][25] In this work, we demonstrate a new approach for multianalyte chemical identification and quantitation using conventional RFID tags that can be potentially deployed as a distributed sensor network.…”

“…[16][17][18] Unfortunately, the most prominent limitations of reported RFID and other wireless chemical, biological, and physical sensors are difficulties in accurate measurements in presence of interferences, difficulties in quantitation of multiple parameters with a single sensor, and the need for costly development of dedicated transducers for sensing. [16][17][18][19][20][21][22][23][24][25] In this work, we demonstrate a new approach for multianalyte chemical identification and quantitation using conventional RFID tags that can be potentially deployed as a distributed sensor network. 26 Unlike other approaches of using RFID sensors, where a special tag should be designed at a much higher cost, [16][17][18] our approach utilizes a conventional RFID tag that is simply coated with a chemically sensitive film.…”