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Sensors sensor-based device architecture

The PEDOT PSS-based electrochemical transistor balance at the boundary between amperometric and potentiometric sensor functionality. Its device architecture is simple and robust and these PEDOT PSS sensors can easily be manufactured using standard printing technologies. In addition, its proper ion-to-electron transduction characteristics and the possibility to integrate biologically active substances promise for simple and sensitive sensors in the... [Pg.278]

To this end, oxide coatings have been used with some success to minimise the device capacitance [45]. However, the most notable development in this area is the transition to (semi-) CMOS-based device architectures. While conventional solid-state nanopore devices typically have capacitances of several 100s pF, Rosenstein et al. have miniaturised the detection electronics and integrated it as closely as possible with the nanopore sensor [26]. This minimises parasitic capacitances and resulted in an overall device capacitance below 6 pF. Accordingly, these authors achieve a signal-to-noise ratio of 5 at 1 MHz band width, which is arguably the speed record to date. [Pg.176]

The limit for the operating temperature of CMOS-microhotplates can be extended by using the microhotplate that was presented in Sect. 4.3. We now detail high-temperature microhotplates with Pt-resistors that have been realized as a single-chip device with integrated circuitry. While the aluminum-based devices presented in Sect. 4.1 were limited to 350 °C, these improved microhotplates can be heated to temperatures up to 500 °C. As the typical resistance value of the Pt-resistor is between 50 and 100 Q, a chip architecture adapted to the low temperature sensor resistance was developed. The system performance was assessed, and chemical measurements have been performed that demonstrate the full functionality of the chip. [Pg.78]

As a low-cost alternative to traditional inorganic semiconductors based transistors, organic field effect transistors are ideally positioned for applications such as radio frequency ID tags, sensors, and smart banknotes [36-40]. An archetypical structure of a bottom-gate top-contact OFET is shown in Scheme 3.7a. Other device architectures have also been employed depending on the relative... [Pg.56]

This chapter includes two different sensor system architectures for monolithic gas sensing systems. Section 5.1 describes a mixed-signal architecture. This is an improved version of the first analog implementation [81,91], which was used to develop a first sensor array (see Sect. 6.1). Based on the experience with these analog devices, a complete sensor system with advanced control, readout and interface circuit was devised. This system includes the circular microhotplate that has been described and characterized in Sect. 4.1. Additionally to the fabrication process, a prototype packaging concept was developed that will be presented in Sect. 5.1.6. A microhotplate with a Pt-temperature sensor requires a different system architecture as will be described in Sect. 5.2. A fully differential analog architecture will be presented, which enables operating temperatures up to 500 °C. [Pg.61]

Electrode surfaces modified with a multilayered surface architecture prepared by a layer-by-layer repeated deposition of several enzyme mono-layers show a modulated increase of surface-bound protein with a subsequent increase in output current, which is directly correlated with the number of deposited protein layers. The versatility of this approach allows alternate layers of different proteins for the manufacture of electrode surfaces, which are the basis for multianalyte sensing devices with multiple substrate specificities. The surface chemistry used for the manufacture of multilayered electrode surfaces is similar to that previously described for the preparation of affinity sensors, and is based on the stabilization of self-assembled multilayer assemblies by specific affinity interactions, electrostatic attraction, or covalent binding between adjacent monolayers. [Pg.54]


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