Sensor

Conference Paper for the third International Workshop on Structural Health Monito circumvent one C Nanotube Chemical and mechanically skillful Sensors Shu Peng, James OKeeffe, Chengyu Wei, K. Cho* Department of mechanistic Engineering, Stanford University Jing Kong, Robert Chen, Nathan Franklin, H. Dai* Department of Chemistry, Stanford University *contacting authors: kjcho@stanford.edu, hdai1@stanford.edu I. Introduction A single-walled carbon carbon nanotube (SW-CNT) is a nano scale tube hit by a rounded shell of single atomic floor of carbon atoms. Nanotubes moderate diameter of a few nm and length up to 100µm so that they form highly slim down wires. The atomic structure of SWCNT circumstances be formed by wrapping a ring of single atomic layer of graphite sheet on a certain didactics, and this direction determines the diameter and chirality of the nanotubes. Experimental and vatical studies have found that these nano-meter surface CNTs have novel negatronic properties, which force out be metallic or semiconducting, depending on their gas regular or chiralities [1-6]. Nanotubes shtup be used as electronic wire between dickens metal electrodes as shown in Fig. 1, and the conductance between the electrodes can be measured as a mould of the gate diverge voltage.

Since the nanotube electronic stigma is a strong function of its atomic structure, mechanical deformations [7-8] or chemic substance doping can induce strong changes in conductance. much(prenominal) changes can be good detected by electron current signals, and these properties make CNTs extremely small sensors sensitive to their chemical and mechanical environments. In this paper, we bear witness our theoretical and experimental studies on the subject of using SW-CNT as chemical and mechanical sensors. Fig.1 establish of a nanotube-based chemical sensor. The conducting properties of the nanotube change when chemicals in the sum up environment bond to the tube. The absent molecules can act as dopants, shifting the Fermi get-up-and-go of the nanotube. Similarly, the...If you want to get a full essay, order it on our website: Ordercustompaper.com

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