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• W4138723 abstract "SWNTs possess unique properties that make them excellent candidates for sensing technology. Because the properties of a SWNT depend sensitively on its structure and because a SWNT is composed entirely of surface atoms, a slight variation of its environment tends to have a noticeable effect on its properties. Many types of sensors have been demonstrated using nanotubes, such as chemical [1–3], biological [4], flow [5], strain [6], pressure [7, 8], thermal [9], and mass [10] sensors. In this chapter, we will focus on the chemical sensing using SWNT FET devices. Chemical sensors based on individual SWNTs were first demonstrated in year 2000 [11, 12]. The devices were constructed in the field effect transistor scheme. In Ref. [11], a constant bias was applied between the source and the drain electrodes and the current of the SWNT was monitored while gas molecules were introduced into the chamber. It was found that the electrical conductance of a semiconducting SWNT dramatically increases and decreases upon exposure to gaseous molecules of NO2 and NH3, respectively, as shown in Fig. 8.1. These SWNT sensors have many advantages, including fast responses, small sizes (therefore high packing density), high sensitivities (sub-ppm levels) and room-temperature operation, etc. As a result, there has been tremendous interest in using SWNT FETs as chemical and biological sensors. Two different sensing mechanisms have been proposed in literature. The first one suggests the charge transfer between the SWNTs and the analyte molecules that adsorb on the SWNT surface [13], which then gives rise to the carrier density, and thus channel conductance change. The second mechanism resorts to the modification of the Schottky barriers (SB) at the metal-SWNT contacts due to the adsorption of molecules on both the metal and the SWNT. Depending on the specific analyte and the contact material, reports vary on which effect dominates the" @default.
• W4138723 created "2016-06-24" @default.
• W4138723 creator A5009063301 @default.
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• W4138723 date "2008-12-31" @default.
• W4138723 modified "2023-09-25" @default.
• W4138723 title "Chemical Sensing with SWNT FETs" @default.
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• W4138723 doi "https://doi.org/10.1007/978-0-387-69285-2_8" @default.
• W4138723 hasPublicationYear "2008" @default.
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