Sensor

Conference Paper for the 3rd International Workshop on Structural Health Monitoring Carbon Nano electron tube chemical and mechanistic Sensors Shu Peng, James OKeeffe, Chengyu Wei, K. Cho* Department of Mechanical Engineering, Stanford University Jing Kong, Robert Chen, Nathan Franklin, H. Dai* Department of Chemistry, Stanford University *cont cultivateing authors: kjcho@stanford.edu, hdai1@stanford.edu I. origin A single-walled carbon nanotube (SW-CNT) is a nano scale tube create by a cylindrical shell of single atomic layer of carbon atoms. Nanotubes have diameter of a few nm and length up to 100µm so that they form extremely thin wires. The atomic social system of SWCNT plenty be formed by wrapping a ring of single atomic layer of graphite canvas tent on a certain direction, and this direction determines the diameter and chirality of the nanotubes. data-based and hypothetic studies have found that these nano-meter sized CNTs have sweet negatronic properties, w hich can be metallic or semiconducting, depending on their blow constant or chiralities [1-6]. Nanotubes can be used as electronic wire between two metal electrodes as shown in Fig. 1, and the conductance between the electrodes can be measured as a function of the gate bias voltage.

Since the nanotube electronic spot is a untroubled function of its atomic structure, mechanical deformations [7-8] or chemical substance doping can induce strong changes in conductance. much(prenominal) changes can be easily detected by electron current signals, and these properties make CNTs extremely small sensors new to their che mical and mechanical environments. In this p! aper, we present our theoretical and observational studies on the subject of using SW-CNT as chemical and mechanical sensors. Fig.1 established of a nanotube-based chemical sensor. The conducting properties of the nanotube change when chemicals in the adjoin environment bond to the tube. The absorbed molecules can act as dopants, shifting the Fermi energy of the nanotube. Similarly, the...If you want to run a full essay, order it on our website: BestEssayCheap.com

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